Group items matching "collider" in title, tags, annotations or url - Advanced Concepts Team

Artificial Braneworlds Made to Collide In Lab - Technology Review - 4 views

www.technologyreview.com/...27537

metamaterials cosmology PHY

shared by santecarloni on 31 Jan 12 - No Cached

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santecarloni on 31 Jan 12

Physicists have simulated two universes colliding inside a metamaterial-- Now, this is cool (if it is true...)

<div class="cArrow"> </div><div class="cContentInner">Physicists have simulated two universes colliding inside a metamaterial-- Now, this is cool (if it is true...)</div>

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LeopoldS on 01 Feb 12

we... the article is a bit overblown in my view ... except maybe the last paragraphs: "The collision between universe's is a variation on this theme. "The "colliding universe" scenario can be realized as a simple extension of our earlier experiments simulating the spacetime geometry in the vicinity of big bang," he says. He simulates an expanding universe using concetric rings of gold separated by a dielectric. "When the two concentric ring ("universe") patterns touch each other ("collide"), a Minkowski domain wall is created, in which the metallic stripes touch each other at a small angle," he says. Being able to recreate these exotic events in the lab is certainly interesting but it is beginning to lose its novelty. The problem is that this work is not telling us anything we didn't know--the universe behaves the same way inside a metamaterial as it does outside. What Smolyaninov needs is a way of using his exotic materials to do something interesting. In other words, he needs a killer app. Any ideas? "

<div class="cArrow"> </div><div class="cContentInner">we... the article is a bit overblown in my view ... except maybe the last paragraphs: "The collision between universe's is a variation on this theme. "The "colliding universe" scenario can be realized as a simple extension of our earlier experiments simulating the spacetime geometry in the vicinity of big bang," he says. He simulates an expanding universe using concetric rings of gold separated by a dielectric. "When the two concentric ring ("universe") patterns touch each other ("collide"), a Minkowski domain wall is created, in which the metallic stripes touch each other at a small angle," he says. Being able to recreate these exotic events in the lab is certainly interesting but it is beginning to lose its novelty. The problem is that this work is not telling us anything we didn't know--the universe behaves the same way inside a metamaterial as it does outside. What Smolyaninov needs is a way of using his exotic materials to do something interesting. In other words, he needs a killer app. Any ideas? "</div>

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Luzi Bergamin on 05 Feb 12

Hm, they use more or less everything I don't especially like. They are nonmagnetic, so the relation materialGR is already rather weak. Usually, experimentalists prefer nonmagnetic media, since they are cheaper and broadband. At least the broadband is no argument here, since the frequency defines the "mass", which I find a rather strange point of view. And finally, they use strong anisotropy as a model of "time", which is rather problematic. Of course, the spatial direction with eps<0 appears in the wave equation with the same sign as time. But this does not mean that it behaves like time. But to teach material physicists that time is more than just a different sign in the wave equation seems to be as hopeless as to teach them that a black hole is more than something that absorbs all light... SIGHHH

<div class="cArrow"> </div><div class="cContentInner">Hm, they use more or less everything I don't especially like. They are nonmagnetic, so the relation materialGR is already rather weak. Usually, experimentalists prefer nonmagnetic media, since they are cheaper and broadband. At least the broadband is no argument here, since the frequency defines the "mass", which I find a rather strange point of view. And finally, they use strong anisotropy as a model of "time", which is rather problematic. Of course, the spatial direction with eps<0 appears in the wave equation with the same sign as time. But this does not mean that it behaves like time. But to teach material physicists that time is more than just a different sign in the wave equation seems to be as hopeless as to teach them that a black hole is more than something that absorbs all light... SIGHHH</div>

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LeopoldS on 10 Feb 12

Luzi I miss you ...

<div class="cArrow"> </div><div class="cContentInner">Luzi I miss you ...</div>

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Scientists discover how to turn light into matter after 80-year quest - 5 views

phys.org/...-05-scientists-year-quest.html

PHY MAD

shared by jmlloren on 19 May 14 - No Cached

Nicholas Lan, johannessimon81, Thijs Versloot, H H, annaheffernan, and Paul N liked it

Thijs Versloot on 19 May 14

Theoretized 80 years ago was Breit-Wheeler pair production in which two photons result in an electron-positron pair (via a virtual electron). It is a relatively simple Feynmann diagram, but the problem is/was how to produce in practice a high energy photon-photon collider... The collider experiment that the scientists have proposed involves two key steps. First, the scientists would use an extremely powerful high-intensity laser to speed up electrons to just below the speed of light. They would then fire these electrons into a slab of gold to create a beam of photons a billion times more energetic than visible light. The next stage of the experiment involves a tiny gold can called a hohlraum (German for 'empty room'). Scientists would fire a high-energy laser at the inner surface of this gold can, to create a thermal radiation field, generating light similar to the light emitted by stars. They would then direct the photon beam from the first stage of the experiment through the centre of the can, causing the photons from the two sources to collide and form electrons and positrons. It would then be possible to detect the formation of the electrons and positrons when they exited the can. Now this is a good experiment... :)

<div class="cArrow"> </div><div class="cContentInner">Theoretized 80 years ago was Breit-Wheeler pair production in which two photons result in an electron-positron pair (via a virtual electron). It is a relatively simple Feynmann diagram, but the problem is/was how to produce in practice a high energy photon-photon collider... The collider experiment that the scientists have proposed involves two key steps. First, the scientists would use an extremely powerful high-intensity laser to speed up electrons to just below the speed of light. They would then fire these electrons into a slab of gold to create a beam of photons a billion times more energetic than visible light. The next stage of the experiment involves a tiny gold can called a hohlraum (German for 'empty room'). Scientists would fire a high-energy laser at the inner surface of this gold can, to create a thermal radiation field, generating light similar to the light emitted by stars. They would then direct the photon beam from the first stage of the experiment through the centre of the can, causing the photons from the two sources to collide and form electrons and positrons. It would then be possible to detect the formation of the electrons and positrons when they exited the can. Now this is a good experiment... :)</div>

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jmlloren on 19 May 14

The solution of thrusting in space.

<div class="cArrow"> </div><div class="cContentInner">The solution of thrusting in space.</div>

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dejanpetkow on 20 May 14

Thrusting in space is solved already. Maybe you wanted to say something different?

<div class="cArrow"> </div><div class="cContentInner">Thrusting in space is solved already. Maybe you wanted to say something different?</div>

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Thijs Versloot on 21 May 14

Thrusting until your fuel runs out is solved, in this way one can produce mass from, among others, solar/star energy directly. What I like about this experiment is that we have the technology already to do it, many parts have been designed for inertial confinement fusion.

<div class="cArrow"> </div><div class="cContentInner">Thrusting until your fuel runs out is solved, in this way one can produce mass from, among others, solar/star energy directly. What I like about this experiment is that we have the technology already to do it, many parts have been designed for inertial confinement fusion.</div>

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johannessimon81 on 29 May 14

I am quite certain that it would be more efficient to use the photons directly for thrust instead of converting them into matter. Also, I am a bit puzzled at the asymmetric layout for photon creation. Typically, colliders use two beam of particle with equal but opposite momentum. Because the total momentum for two colliding particles is zero the reaction products are produced more efficiently as a minimum of collision energy is waisted on accelerating the products. I guess in this case the thermal radiation in the cavity is chosen instead of an opposing gamma ray beam to increase the photon density and increase the number of collisions (even if the efficiency decreases because of the asymmetry). However, a danger from using a high temperature cavity might be that a lot of thermionic emission creates lots of free electrons with the cavity. This could reduce the positron yield through recombination and would allow the high energetic photons to loose energy through Compton scattering instead of the Breit-Wheeler pair production.

<div class="cArrow"> </div><div class="cContentInner">I am quite certain that it would be more efficient to use the photons directly for thrust instead of converting them into matter. Also, I am a bit puzzled at the asymmetric layout for photon creation. Typically, colliders use two beam of particle with equal but opposite momentum. Because the total momentum for two colliding particles is zero the reaction products are produced more efficiently as a minimum of collision energy is waisted on accelerating the products. I guess in this case the thermal radiation in the cavity is chosen instead of an opposing gamma ray beam to increase the photon density and increase the number of collisions (even if the efficiency decreases because of the asymmetry). However, a danger from using a high temperature cavity might be that a lot of thermionic emission creates lots of free electrons with the cavity. This could reduce the positron yield through recombination and would allow the high energetic photons to loose energy through Compton scattering instead of the Breit-Wheeler pair production.</div>

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Thijs Versloot on 30 May 14

Well, the main benefit from e-p pair creation might be that one can accelerate these subsequently to higher energies again. I think the photon-photon cross-section is extremely low, such that direct beam-beam interactions are basically not happening (below 1/20.. so basically 0 according to quantum probability :P), in this way, the central line of the hohlraum actually has a very high photon density and if timed correctly maximizes the reaction yield such that it could be measured.

<div class="cArrow"> </div><div class="cContentInner">Well, the main benefit from e-p pair creation might be that one can accelerate these subsequently to higher energies again. I think the photon-photon cross-section is extremely low, such that direct beam-beam interactions are basically not happening (below 1/20.. so basically 0 according to quantum probability :P), in this way, the central line of the hohlraum actually has a very high photon density and if timed correctly maximizes the reaction yield such that it could be measured.</div>

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johannessimon81 on 30 May 14

I agree about the reason for the hohlraum - but I also keep my reservations about the drawbacks. About the pair production as fuel: I pretty sure that your energy would be used smarter in using photon (not necessarily high energy photons) for thrust directly instead of putting tons of energy in creating a rest-mass and then accelerating that. If you look at E² = (p c)²+(m0 c)² then putting energy into the mass term will always reduce your maximum value of p.

<div class="cArrow"> </div><div class="cContentInner">I agree about the reason for the hohlraum - but I also keep my reservations about the drawbacks. About the pair production as fuel: I pretty sure that your energy would be used smarter in using photon (not necessarily high energy photons) for thrust directly instead of putting tons of energy in creating a rest-mass and then accelerating that. If you look at E² = (p c)²+(m0 c)² then putting energy into the mass term will always reduce your maximum value of p.</div>

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Thijs Versloot on 31 May 14

True, but isnt it E2=(pc)^2 + (m0c^2)^2 such that for photons E\propto{pc} and for mass E\propto{mc^2}. I agree it will take a lot of energy, but this assumes that that wont be the problem at least. The question therefore is whether the mass flow of the photon rocket (fuel consumed to create photons, eg fission/fusion) is higher/lower than the mass flow for e-p creation. You are probably right that the low e-p cross-section will favour direct use of photons to create low thrust for long periods of time, but with significant power available the ISP might be higher for e-p pair creation.

<div class="cArrow"> </div><div class="cContentInner">True, but isnt it E2=(pc)^2 + (m0c^2)^2 such that for photons E\propto{pc} and for mass E\propto{mc^2}. I agree it will take a lot of energy, but this assumes that that wont be the problem at least. The question therefore is whether the mass flow of the photon rocket (fuel consumed to create photons, eg fission/fusion) is higher/lower than the mass flow for e-p creation. You are probably right that the low e-p cross-section will favour direct use of photons to create low thrust for long periods of time, but with significant power available the ISP might be higher for e-p pair creation.</div>

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johannessimon81 on 03 Jun 14

In essence the equation tells you that for photons with zero rest mass m0 all the energy will be converted to momentum of the particles. If you want to accelerate e-p then you first spend part of the energy on creating them (~511 keV each) and you can only use the remaining energy to accelerate them. In this case the equation gives you a lower particle momentum which leads to lower thrust (even when assuming 100% acceleration efficiency). ISP is a tricky concept in this case because there are different definitions which clash in the relativistic context (due to the concept of mass flow). R. Tinder gets to a I_SP = c (speed of light) for a photon rocket (using the relativistic mass of the photons) which is the maximum possible relativistic I_SP: http://goo.gl/Zz5gyC .

<div class="cArrow"> </div><div class="cContentInner">In essence the equation tells you that for photons with zero rest mass m0 all the energy will be converted to momentum of the particles. If you want to accelerate e-p then you first spend part of the energy on creating them (~511 keV each) and you can only use the remaining energy to accelerate them. In this case the equation gives you a lower particle momentum which leads to lower thrust (even when assuming 100% acceleration efficiency). ISP is a tricky concept in this case because there are different definitions which clash in the relativistic context (due to the concept of mass flow). R. Tinder gets to a I_SP = c (speed of light) for a photon rocket (using the relativistic mass of the photons) which is the maximum possible relativistic I_SP: <a href="http://goo.gl/Zz5gyC" rel="nofollow" target="_blank">http://goo.gl/Zz5gyC</a> .</div>

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Couture In Orbit: when space and fashion collide | Science Museum Blog - 0 views

blog.sciencemuseum.org.uk/when-space-and-fashion-collide

fun space

shared by jaihobah on 27 May 16 - No Cached

jaihobah on 27 May 16

I'm not sure what's new here; space and fashion collide violently every day at the ACT...

<div class="cArrow"> </div><div class="cContentInner">I'm not sure what's new here; space and fashion collide violently every day at the ACT...</div>

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LHC trials proton-lead collisions - physicsworld.com - 0 views

physicsworld.com/...47703

shared by santecarloni on 07 Nov 11 - No Cached

santecarloni on 07 Nov 11

Physicists at CERN's Large Hadron Collider (LHC) are analysing the results of their first attempt at colliding protons and lead ions. Further attempts at proton-lead collisions are expected over the next few weeks. If these trials are successful, a full-blown experimental programme could run in 2012.

<div class="cArrow"> </div><div class="cContentInner">Physicists at CERN's Large Hadron Collider (LHC) are analysing the results of their first attempt at colliding protons and lead ions. Further attempts at proton-lead collisions are expected over the next few weeks. If these trials are successful, a full-blown experimental programme could run in 2012.</div>

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An Arty Oculus Trip Through the Large Hadron Collider | WIRED - 2 views

www.wired.com/...collider-oculus-rift

FUN VR

shared by Christophe Praz on 27 Oct 14 - No Cached

Christophe Praz on 27 Oct 14

"Collider is an arty audiovisual experience that provides a first-person perspective of a particle hurtling through the Large Hadron Collider"... with the use of the Leapmotion sensor and Oculus Rift hmd. Come to my desk if you wanna try it :) (not that fun actually)

<div class="cArrow"> </div><div class="cContentInner">"Collider is an arty audiovisual experience that provides a first-person perspective of a particle hurtling through the Large Hadron Collider"... with the use of the Leapmotion sensor and Oculus Rift hmd. Come to my desk if you wanna try it :) (not that fun actually)</div>

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Athanasia Nikolaou on 27 Oct 14

we will come when you figure out how to capture a particle!!! or a dragonball, is the same

<div class="cArrow"> </div><div class="cContentInner">we will come when you figure out how to capture a particle!!! or a dragonball, is the same</div>

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Helix Nebula - Helix Nebula Vision - 0 views

www.helix-nebula.eu/...helix-nebula-vision.html

cloud computing IT CERN

shared by LeopoldS on 20 Mar 13 - No Cached

LeopoldS on 20 Mar 13

The partnership brings together leading IT providers and three of Europe's leading research centres, CERN, EMBL and ESA in order to provide computing capacity and services that elastically meet big science's growing demand for computing power.

Helix Nebula provides an unprecedented opportunity for the global cloud services industry to work closely on the Large Hadron Collider through the large-scale, international ATLAS experiment, as well as with the molecular biology and earth observation. The three flagship use cases will be used to validate the approach and to enable a cost-benefit analysis. Helix Nebula will lead these communities through a two year pilot-phase, during which procurement processes and governance issues for the public/private partnership will be addressed.

This game-changing strategy will boost scientific innovation and bring new discoveries through novel services and products. At the same time, Helix Nebula will ensure valuable scientific data is protected by a secure data layer that is interoperable across all member states. In addition, the pan-European partnership fits in with the Digital Agenda of the European Commission and its strategy for cloud computing on the continent. It will ensure that services comply with Europe's stringent privacy and security regulations and satisfy the many requirements of policy makers, standards bodies, scientific and research communities, industrial suppliers and SMEs.

Initially based on the needs of European big-science, Helix Nebula ultimately paves the way for a Cloud Computing platform that offers a unique resource to governments, businesses and citizens.

<div class="cArrow"> </div><div class="cContentInner">The partnership brings together leading IT providers and three of Europe's leading research centres, CERN, EMBL and ESA in order to provide computing capacity and services that elastically meet big science's growing demand for computing power.<br /><br />Helix Nebula provides an unprecedented opportunity for the global cloud services industry to work closely on the Large Hadron Collider through the large-scale, international ATLAS experiment, as well as with the molecular biology and earth observation. The three flagship use cases will be used to validate the approach and to enable a cost-benefit analysis. Helix Nebula will lead these communities through a two year pilot-phase, during which procurement processes and governance issues for the public/private partnership will be addressed.<br /><br />This game-changing strategy will boost scientific innovation and bring new discoveries through novel services and products. At the same time, Helix Nebula will ensure valuable scientific data is protected by a secure data layer that is interoperable across all member states. In addition, the pan-European partnership fits in with the Digital Agenda of the European Commission and its strategy for cloud computing on the continent. It will ensure that services comply with Europe's stringent privacy and security regulations and satisfy the many requirements of policy makers, standards bodies, scientific and research communities, industrial suppliers and SMEs.<br /><br />Initially based on the needs of European big-science, Helix Nebula ultimately paves the way for a Cloud Computing platform that offers a unique resource to governments, businesses and citizens. </div>

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Francesco Biscani on 21 Mar 13

"Helix Nebula will lead these communities through a two year pilot-phase, during which procurement processes and governance issues for the public/private partnership will be addressed." And here I was thinking cloud computing was old news 3 years ago :)

<div class="cArrow"> </div><div class="cContentInner">"Helix Nebula will lead these communities through a two year pilot-phase, during which procurement processes and governance issues for the public/private partnership will be addressed." And here I was thinking cloud computing was old news 3 years ago :)</div>

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Higgs Boson Particles being sold on eBay ! - 0 views

www.ebay.com.au/...251100388854

PHY FUN

shared by Luís F. Simões on 05 Jul 12 - No Cached

Luís F. Simões on 05 Jul 12

"Higgs Boson partices - guaranteed to satisfy! Need mass in your objects? Get some Higg Bosons!" "The Higgs Boson particles are SOLD WITH THE JAR! You may not be able to SEE the Higgs Boson particles unless you use a large hadron collider." "Q: Since it is, after all, the god particle; can you observe closely and tell use what religion it is?"

<div class="cArrow"> </div><div class="cContentInner">"Higgs Boson partices - guaranteed to satisfy! Need mass in your objects? Get some Higg Bosons!" "The Higgs Boson particles are SOLD WITH THE JAR! You may not be able to SEE the Higgs Boson particles unless you use a large hadron collider." "Q: Since it is, after all, the god particle; can you observe closely and tell use what religion it is?"</div>

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Laser-Plasma Particle Accelerator - 1 views

www.sciencedaily.com/...130620132412.htm

technology PHY

shared by Beniamino Abis on 21 Jun 13 - No Cached

Thijs Versloot liked it

Beniamino Abis on 21 Jun 13

Can we have one?

<div class="cArrow"> </div><div class="cContentInner">Can we have one?</div>

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johannessimon81 on 21 Jun 13

They say they create 2 GeV electrons in a very small setup. However the laser they use is more than 10 meters in length. Still a really nice result.

<div class="cArrow"> </div><div class="cContentInner">They say they create 2 GeV electrons in a very small setup. However the laser they use is more than 10 meters in length. Still a really nice result.</div>

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Thijs Versloot on 24 Jun 13

Compared to a 27km circumference this is major achievement and it is indeed already foreseen that future colliders will include this technology as beam fillers and pre-accelerators at some point. The technique is quite elegant and a lot more energy efficient. Nevertheless, there are also thoughts that future particle colliders might actually go towards space and study collisions orginating from extremely energetic cosmic particles

<div class="cArrow"> </div><div class="cContentInner">Compared to a 27km circumference this is major achievement and it is indeed already foreseen that future colliders will include this technology as beam fillers and pre-accelerators at some point. The technique is quite elegant and a lot more energy efficient. Nevertheless, there are also thoughts that future particle colliders might actually go towards space and study collisions orginating from extremely energetic cosmic particles</div>

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Has the Large Hadron Collider destroyed the earth yet? - 1 views

hasthelhcdestroyedtheearth.com

science Large Hadron Collider CERN

shared by nikolas smyrlakis on 24 Nov 09 - Cached

nikolas smyrlakis on 24 Nov 09

if you view the source code there's also an RSS feed

<div class="cArrow"> </div><div class="cContentInner">if you view the source code there's also an RSS feed</div>

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pacome delva on 25 Nov 09

well, it seems we'll never be able to see the yes...!

<div class="cArrow"> </div><div class="cContentInner">well, it seems we'll never be able to see the yes...!</div>

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Ma Ru on 25 Nov 09

so ooooooooooooold!!!!

<div class="cArrow"> </div><div class="cContentInner">so ooooooooooooold!!!!</div>

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Cometary billiards: Have you heard, it's in the stars | The Economist - 0 views

www.economist.com/...maybe-have-you-heard-its-stars

neo comets Mars

shared by LeopoldS on 07 Mar 13 - No Cached

LeopoldS on 07 Mar 13

nothing new but nicely written

<div class="cArrow"> </div><div class="cContentInner">nothing new but nicely written</div>

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Meet CERN's New Artist in Residence, Julius von Bismarck - 3 views

www.wired.com/...cern-artist-von-bismarck

shared by Luke O'Connor on 10 May 12 - No Cached

LeopoldS liked it

Luke O'Connor on 10 May 12

Julius von Bismarck is only 28 years old, but his artistic resume is already several pages long. He's currently taking time off from school to be the new artist in residence at CERN ? the world's biggest particle physics research facility, home of the Large Hadron Collider.

<div class="cArrow"> </div><div class="cContentInner">Julius von Bismarck is only 28 years old, but his artistic resume is already several pages long. He's currently taking time off from school to be the new artist in residence at CERN ? the world's biggest particle physics research facility, home of the Large Hadron Collider.</div>

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Luke O'Connor on 10 May 12

Perhaps a new role for the ACT!?

<div class="cArrow"> </div><div class="cContentInner">Perhaps a new role for the ACT!?</div>

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LeopoldS on 11 May 12

very good idea - one that already Andrés had way back and a few years ago I was in contact with a group in Amsterdam who was interested but it never materialised ... any good recommendations? this Bismark guy seems to be a nice chap to have around in the office according to the photo on the site: long beard, a bottle of wine in the office and steering out of the window in search for ideas ... give the ugly office he might even want to swap it with our nice semi open space! :-)

<div class="cArrow"> </div><div class="cContentInner">very good idea - one that already Andrés had way back and a few years ago I was in contact with a group in Amsterdam who was interested but it never materialised ... any good recommendations? this Bismark guy seems to be a nice chap to have around in the office according to the photo on the site: long beard, a bottle of wine in the office and steering out of the window in search for ideas ... give the ugly office he might even want to swap it with our nice semi open space! :-)</div>

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CERN to announce Higgs boson observation at LHC - 1 views

www.extremetech.com/...higgs-boson-observation-at-lhc

PHY science

shared by Lionel Jacques on 12 Dec 11 - No Cached

LeopoldS liked it

Lionel Jacques on 12 Dec 11

Tomorrow, at 9am EST, scientists at the Large Hadron Collider (LHC) at CERN in Switzerland are expected to announce, with fairly strong certainty, that they have observed the Higgs boson "God" particle at a mass-energy of 125 GeV. For just over a week, rumors have been rife that observations with 2.5 to 3.5 sigma certainty (96% to 99.9%) have been made.

<div class="cArrow"> </div><div class="cContentInner">Tomorrow, at 9am EST, scientists at the Large Hadron Collider (LHC) at CERN in Switzerland are expected to announce, with fairly strong certainty, that they have observed the Higgs boson "God" particle at a mass-energy of 125 GeV. For just over a week, rumors have been rife that observations with 2.5 to 3.5 sigma certainty (96% to 99.9%) have been made.</div>

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Higgs hunters close in on their quarry - 1 views

physicsworld.com/...48097

PHY

shared by Lionel Jacques on 13 Dec 11 - No Cached

pacome delva liked it

Lionel Jacques on 13 Dec 11

The first solid experimental evidence for the existence of the Higgs boson has been unveiled today by physicists working on the Large Hadron Collider (LHC) at CERN in Geneva. Members of the ATLAS experiment revealed evidence that the Higgs particle has a mass of about 126 GeV/c2. "By 2014/2015 we could have enough additional data to eliminate large classes of theories that attempt to explain the Higgs,"

<div class="cArrow"> </div><div class="cContentInner">The first solid experimental evidence for the existence of the Higgs boson has been unveiled today by physicists working on the Large Hadron Collider (LHC) at CERN in Geneva. Members of the ATLAS experiment revealed evidence that the Higgs particle has a mass of about 126 GeV/c2. "By 2014/2015 we could have enough additional data to eliminate large classes of theories that attempt to explain the Higgs,"</div>

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Magnetic bubble may give space probes a soft landing - 4 views

www.newscientist.com/article/mg22329763.100-magnetic-bubble-may-give-space-probes-a-soft-landing.html?cmpid=RSS|NSNS|2012-GLOBAL|physics-math#.U7aeTnWSzmE

magnetoshell aerocapture plasma entry

shared by Thijs Versloot on 04 Jul 14 - No Cached

LeopoldS , annaheffernan, Paul N, and Christophe Praz liked it

Thijs Versloot on 04 Jul 14

I am also looking into this idea since some time and it seems NASA is already ahead, awarding two contract to investigate magnetoshell aerocapture. This could be interesting for probes that want to enter eg Marsian atmospheres at relatively high velocity. Or for multiple re-entry s/c at Earth. The idea of the experiment, The satellite will carry a copper coil, powered by a lithium-ion battery, that generates a magnetic field around the probe. As it descends, the spacecraft will eject a small amount of plasma. This gets trapped in the magnetic field, creating a protective bubble that stops air molecules colliding with the craft and producing heat.

<div class="cArrow"> </div><div class="cContentInner">I am also looking into this idea since some time and it seems NASA is already ahead, awarding two contract to investigate magnetoshell aerocapture. This could be interesting for probes that want to enter eg Marsian atmospheres at relatively high velocity. Or for multiple re-entry s/c at Earth. The idea of the experiment, The satellite will carry a copper coil, powered by a lithium-ion battery, that generates a magnetic field around the probe. As it descends, the spacecraft will eject a small amount of plasma. This gets trapped in the magnetic field, creating a protective bubble that stops air molecules colliding with the craft and producing heat.</div>

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LeopoldS on 05 Jul 14

A few years back Mimmo has worked on this, rather from the theory side if I remember well ...

<div class="cArrow"> </div><div class="cContentInner">A few years back Mimmo has worked on this, rather from the theory side if I remember well ...</div>

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Paul N on 11 Jul 14

The power requirements for such a thing must be HUGE!

<div class="cArrow"> </div><div class="cContentInner">The power requirements for such a thing must be HUGE!</div>

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Penrose claims to have glimpsed universe before Big Bang - 0 views

physicsworld.com/...44388

phy cosmology

shared by pacome delva on 22 Nov 10 - No Cached

LeopoldS liked it

According to Penrose and Gurzadyan, these circles allow us to "see through" the Big Bang into the aeon that would have existed beforehand. The circles, they say, are the marks left in our aeon by the spherical ripples of gravitational waves that were generated when black holes collided in the previous aeon.
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Julian Barbour, a visiting professor of physics at the University of Oxford, says that these circles would be "remarkable if real and sensational if they confirm Penrose's theory". They would, he says, "overthrow the standard inflationary picture", which, he adds, has become widely accepted as scientific fact by many cosmologists. But he believes that the result will be "very controversial" and that other researchers will look at the data very critically. He says there are many disputable aspects to the theory
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pacome delva on 22 Nov 10

hehe, a nice controversy? or completely overinterpreted results...?

<div class="cArrow"> </div><div class="cContentInner">hehe, a nice controversy? or completely overinterpreted results...?</div>

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LeopoldS on 23 Nov 10

what the heck is this? sounds strange to me ... would I understand the original paper?

<div class="cArrow"> </div><div class="cContentInner">what the heck is this? sounds strange to me ... would I understand the original paper?</div>

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Higgs hunters face long haul - 2 views

physicsworld.com/...41631

phy higgs particles

shared by pacome delva on 05 Feb 10 - Cached

to reduce the chances of the LHC being derailed again by a similar accident, physicists at the Geneva lab have decided to run the collider at just half its design energy for the next 18-24 months.
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Once the 7 TeV run is over, CERN will shut the LHC down in 2012 for a year or more to prepare it to go straight to maximum-energy 14 TeV collisions in 2013. This will be a complex job that will involve replacing some 10,000 superconducting magnet connections with more robust ones.
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choosing to stay at lower energies is a big price to pay in terms of the Higgs search. "We will need more than twice the data at 7 TeV compared to that needed at 10 TeV to reach the same discovery potential," she says. "At this energy we can at best expect to exclude a Higgs with a mass between 155 and 175 GeV."
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pacome delva on 05 Feb 10

no Higgs boson before 2013... and a replacement of 10,000 superconducting magnet connections ! Reminds me of the the gravitational detectors... no detection before an upgrade in 2013...! There are the big announcements to make the cash flow... and reality !

<div class="cArrow"> </div><div class="cContentInner">no Higgs boson before 2013... and a replacement of 10,000 superconducting magnet connections ! Reminds me of the the gravitational detectors... no detection before an upgrade in 2013...! There are the big announcements to make the cash flow... and reality !</div>

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Luzi Bergamin on 05 Feb 10

Higgs is almost 81, so he should better invest in his health if he wants the Nobel prize... But who cares, it's another 5 years window where high-energy theorists can produce nonsense with no experimental evidence. They should be happy!

<div class="cArrow"> </div><div class="cContentInner">Higgs is almost 81, so he should better invest in his health if he wants the Nobel prize... But who cares, it's another 5 years window where high-energy theorists can produce nonsense with no experimental evidence. They should be happy!</div>

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RHIC nets strange antimatter - 0 views

physicsworld.com/...41917

strange_antimatter collider

shared by pacome delva on 08 Mar 10 - Cached

The antihypertriton – consisting of an antiproton, an antineutron and an antilambda particle – is the heaviest antinucleus yet produced and opens up a new realm of strange antinucluei. It could also shed light on a number of problems in astrophysics and cosmology, including the dominance of matter over antimatter in the universe.
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Essay - The Collider, the Particle and a Theory About Fate - NYTimes.com - 4 views

www.nytimes.com/...13lhc.html

LHC Higgs_boson

shared by Nina Nadine Ridder on 14 Oct 09 - Cached

pacome delva on 19 Oct 09

cannot access to this one...

<div class="cArrow"> </div><div class="cContentInner">cannot access to this one...</div>

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Nina Nadine Ridder on 19 Oct 09

Sorry, works for me though... Dunno what s wrong!

<div class="cArrow"> </div><div class="cContentInner">Sorry, works for me though... Dunno what s wrong!</div>

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Report: Planets will collide in 5 billion years - 0 views

www.sfgate.com/...article.cgi

astrodynamic space planets

shared by Joris _ on 11 Jun 09 - No Cached

Mercury, Mars, Venus and Earth to smash into each other, either one at a time or all at once
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by the end of that same 5 billion years the sun will have burned up its hydrogen and in a cooler state will inflate itself
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the great "gas giants" of the outer solar system - Jupiter, Saturn, Uranus and Neptune - are extremely stable in their orbits, so they could remain where they are for a much longer time
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Joris _ on 11 Jun 09

Interesting, but obviously something is wrong. How the big giants can remain still if the inner planets and the sun vanish at the same time !

<div class="cArrow"> </div><div class="cContentInner">Interesting, but obviously something is wrong. How the big giants can remain still if the inner planets and the sun vanish at the same time !</div>

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U.S., Russian satellites collide in space - 0 views

news.yahoo.com/...us_space_collision

shared by ESA ACT on 24 Apr 09 - No Cached

ESA ACT on 24 Apr 09

no comments

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