Group items tagged dark - Advanced Concepts Team

Did dark matter kill the dinosaurs? : Nature News & Comment - 1 views

www.nature.com/...ter-kill-the-dinosaurs-1.14839

dinosaurs matter dark nature BIO science PHY space

shared by Tom Gheysens on 12 Mar 14 - No Cached

Tom Gheysens on 12 Mar 14

theoretical physicists... :) Read the last sentence of the paper...in this way anyone can publish in nature...just make a good story with little evidence Did dark matter kill the dinosaurs? The Solar System's periodic passage through a 'dark disk' on the galactic plane could trigger comet bombardments that would cause mass extinctions.

<div class="cArrow"> </div><div class="cContentInner">theoretical physicists... :) Read the last sentence of the paper...in this way anyone can publish in nature...just make a good story with little evidence Did dark matter kill the dinosaurs? The Solar System's periodic passage through a 'dark disk' on the galactic plane could trigger comet bombardments that would cause mass extinctions.</div>

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Thijs Versloot on 13 Mar 14

Hmm.. right.. then again, this is not an actual journal publication but a news broadcast. But you are right that the name Nature is attached to it so the journal is definitely banking on their acquired status.

<div class="cArrow"> </div><div class="cContentInner">Hmm.. right.. then again, this is not an actual journal publication but a news broadcast. But you are right that the name Nature is attached to it so the journal is definitely banking on their acquired status.</div>

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Dark matter 'no result' comes under fire - 3 views

physicsworld.com/...42554

phy astrophysics dark_matter controversy

shared by pacome delva on 07 May 10 - Cached

On Monday the XENON100 collaboration published an analysis of the first experimental results from its dark-matter detector. It reported no evidence of dark matter, the substance thought to constitute over 80% of mass in the universe. The experiment covered a similar parameter range as dark-matter searches DAMA and CoGeNT, which have previously claimed possible evidence for dark matter. As a result, the XENON100 team concluded that both the DAMA and CoGeNT evidence could be excluded. But now the DAMA and CoGeNT collaborations claim that the XENON100 researchers' analysis is flawed, and that their original evidence for dark matter should remain intact
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Two direct hits in dark matter hunt : Nature News - 0 views

www.nature.com/...news.2009.1151.html

phys dark_matter LHC

shared by Nina Nadine Ridder on 18 Dec 09 - No Cached

Nina Nadine Ridder on 18 Dec 09

two events detected by Cryogenic Dark Matter Search II, if those were caused by dark matter remains to be proven

<div class="cArrow"> </div><div class="cContentInner">two events detected by Cryogenic Dark Matter Search II, if those were caused by dark matter remains to be proven</div>

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Mysterious 'dark flow' at the edge of the universe - 1 views

physicsworld.com/...41984

cosmology dark_flow

shared by pacome delva on 16 Mar 10 - Cached

Cosmologists have already observed two distinct effects caused by invisible entities in the universe: dark matter is known to affect the rotation of galaxies and dark energy seems to be causing the expansion of the universe to accelerate. Dark flow is the latest addition to this shadowy family.
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pacome delva on 16 Mar 10

I think Lucas didn't know he would have such an impact in science with Star Wars...!

<div class="cArrow"> </div><div class="cContentInner">I think Lucas didn't know he would have such an impact in science with Star Wars...!</div>

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nikolas smyrlakis on 16 Mar 10

do you think it could be the dark side of The Force?

<div class="cArrow"> </div><div class="cContentInner">do you think it could be the dark side of The Force?</div>

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pacome delva on 16 Mar 10

what else...?

<div class="cArrow"> </div><div class="cContentInner">what else...?</div>

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Ample Dark Matter Ignites Starburst Galaxies | Wired Science | Wired.com - 1 views

www.wired.com/...dark-matter-starbursts

PHY space science

shared by LeopoldS on 17 Feb 11 - No Cached

LeopoldS on 17 Feb 11

true?

<div class="cArrow"> </div><div class="cContentInner">true?</div>

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Luzi Bergamin on 19 Feb 11

I think what these studies show (assuming that data and analysis are correct) is the fact that there is something fundamentally wrong about all this dark matter, dark energy dark whatever stuff. From this point of view I would say: nice result, go ahead!!

<div class="cArrow"> </div><div class="cContentInner">I think what these studies show (assuming that data and analysis are correct) is the fact that there is something fundamentally wrong about all this dark matter, dark energy dark whatever stuff. From this point of view I would say: nice result, go ahead!!</div>

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Three new maps shine light on dark matter - physicsworld.com - 0 views

physicsworld.com/...48273

dark matter Space PHY

shared by santecarloni on 13 Jan 12 - No Cached

santecarloni on 13 Jan 12

Three independent teams of astronomers have released new and improved maps of where dark matter is lurking in parts of the universe

<div class="cArrow"> </div><div class="cContentInner">Three independent teams of astronomers have released new and improved maps of where dark matter is lurking in parts of the universe</div>

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Mapping Dark Matter Case Study - Kaggle - 3 views

host.kaggle.com/mdm

crowdsourcing competition data mining image dark_matter

shared by Luís F. Simões on 08 Nov 11 - No Cached

Mapping Dark Matter competition to encourage the development of new algorithms that can measure the way dark matter causes tiny distortions in images of galaxies by changing their ellipticity, or how their shapes are stretched.
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Luís F. Simões on 08 Nov 11

Blog posts describing the approaches followed by the contestants that ranked 1st, 2nd and 3rd.

<div class="cArrow"> </div><div class="cContentInner">Blog posts describing the approaches followed by the contestants that ranked 1st, 2nd and 3rd.</div>

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Dark Matter or Black Hole Propulsion? - 1 views

www.newscientist.com/...s-for-interstellar-travel.html

NRG propulsion star travel space PHY

shared by Ma Ru on 25 Nov 09 - Cached

Ma Ru on 25 Nov 09

Anyone out there still doing propulsion stuff? Two more papers just waiting to get busted... http://arxiv.org/abs/0908.1429v1 http://arxiv.org/abs/0908.1803

<div class="cArrow"> </div><div class="cContentInner">Anyone out there still doing propulsion stuff? Two more papers just waiting to get busted... <a href="http://arxiv.org/abs/0908.1429v1" rel="nofollow" target="_blank">http://arxiv.org/abs/0908.1429v1</a> <a href="http://arxiv.org/abs/0908.1803" rel="nofollow" target="_blank">http://arxiv.org/abs/0908.1803</a></div>

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...5 more comments...
Luzi Bergamin on 26 Nov 09

What an awful bunch of complete nonsense!!! But I don't think anybody wants to hear MY opinion on this...

<div class="cArrow"> </div><div class="cContentInner">What an awful bunch of complete nonsense!!! But I don't think anybody wants to hear MY opinion on this...</div>

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pacome delva on 26 Nov 09

wow, is this serious at all...!?

<div class="cArrow"> </div><div class="cContentInner">wow, is this serious at all...!?</div>

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Luzi Bergamin on 26 Nov 09

Are you joking?? The BH drive propses a BH with a lifetime of about an year, just 10^7 tons, peanuts!! Then you have to produce it, better not on Earth, so you do this in space, with a laser that produces an equivalent of 10^9 tons highly foucussed, even more peanuts!! Reasonable losses in the production process (probably 99,999%) are not yet taken into account. Engineering problems... :-) The DM drive is even better, they want to collect DM and compress it in a propulsion chamber. Very easy to collect and compress a gas of particles that traverse the Earth without any interaction. Perhaps if the walls of the chamber are made of artificial BHs?? Who knows??

<div class="cArrow"> </div><div class="cContentInner">Are you joking?? The BH drive propses a BH with a lifetime of about an year, just 10^7 tons, peanuts!! Then you have to produce it, better not on Earth, so you do this in space, with a laser that produces an equivalent of 10^9 tons highly foucussed, even more peanuts!! Reasonable losses in the production process (probably 99,999%) are not yet taken into account. Engineering problems... :-) The DM drive is even better, they want to collect DM and compress it in a propulsion chamber. Very easy to collect and compress a gas of particles that traverse the Earth without any interaction. Perhaps if the walls of the chamber are made of artificial BHs?? Who knows??</div>

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LeopoldS on 26 Nov 09

WRONG!!! we are all just WAITING for your opinion on this ....!!!

<div class="cArrow"> </div><div class="cContentInner">WRONG!!! we are all just WAITING for your opinion on this ....!!!</div>

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pacome delva on 27 Nov 09

well, yes my remark was ironic... I'm surprised they did a magazine on these concepts...! But the press is always waiting for sensational. They do not even wait for the work to be peer-reviewed now to make an article on it ! This is one of the bad sides of arxiv in my opinion. It's like a journalist that make an article with a copy-paste in wikipedia ! Anyway, this is of course complete bullsh..., and I would have laughed if I had read this in a sci-fi book... but in a "serious" article i'm crying... For the DM i do not agree with your remark Luzi. It's not dark energy they want to use. The DM is baryonic, it's dark just because it's cold so we don't see it by usual means. If you believe the in the standard model of cosmology, then the DM should be somewhere around the galaxies. But it's of course not uniformly distributed, so a DM engine would work (if at all...) only in the periphery of galaxies. It's already impossible to get there...

<div class="cArrow"> </div><div class="cContentInner">well, yes my remark was ironic... I'm surprised they did a magazine on these concepts...! But the press is always waiting for sensational. They do not even wait for the work to be peer-reviewed now to make an article on it ! This is one of the bad sides of arxiv in my opinion. It's like a journalist that make an article with a copy-paste in wikipedia ! Anyway, this is of course complete bullsh..., and I would have laughed if I had read this in a sci-fi book... but in a "serious" article i'm crying... For the DM i do not agree with your remark Luzi. It's not dark energy they want to use. The DM is baryonic, it's dark just because it's cold so we don't see it by usual means. If you believe the in the standard model of cosmology, then the DM should be somewhere around the galaxies. But it's of course not uniformly distributed, so a DM engine would work (if at all...) only in the periphery of galaxies. It's already impossible to get there...</div>

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Luzi Bergamin on 27 Nov 09

One reply to Pacome, though the discussion exceeds by far the relevance of the topic already. Baryonic DM is strictly limited by cosomology, if one believes in these models, of course. Anyway, even though most DM is cold, we are constantly bombarded by some DM particles that come together with cosmic radiation, solar wind etc. etc. If DM easily interacted with normal matter, we would have found it long ago. In the paper they consider DM as neutralinos, which are neither baryonic nor strongly or electromagnetically interacting.

<div class="cArrow"> </div><div class="cContentInner">One reply to Pacome, though the discussion exceeds by far the relevance of the topic already. Baryonic DM is strictly limited by cosomology, if one believes in these models, of course. Anyway, even though most DM is cold, we are constantly bombarded by some DM particles that come together with cosmic radiation, solar wind etc. etc. If DM easily interacted with normal matter, we would have found it long ago. In the paper they consider DM as neutralinos, which are neither baryonic nor strongly or electromagnetically interacting.</div>

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pacome delva on 27 Nov 09

well then I agree, how the fu.. they want to collect them !!!

<div class="cArrow"> </div><div class="cContentInner">well then I agree, how the fu.. they want to collect them !!!</div>

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Scientists have developed a material so dark that you can't see it... - 7 views

www.independent.co.uk/...t-you-cant-see-it-9602504.html

technology material light absorption

shared by Thijs Versloot on 14 Jul 14 - No Cached

Marcus Maertens, annaheffernan, Athanasia Nikolaou, and Christophe Praz liked it

Thijs Versloot on 14 Jul 14

A British company has produced a "strange, alien" material so black that it absorbs all but 0.035 per cent of visual light, setting a new world record. To stare at the "super black" coating made of carbon nanotubes - each 10,000 times thinner than a human hair - is an odd experience.

<div class="cArrow"> </div><div class="cContentInner">A British company has produced a "strange, alien" material so black that it absorbs all but 0.035 per cent of visual light, setting a new world record. To stare at the "super black" coating made of carbon nanotubes - each 10,000 times thinner than a human hair - is an odd experience.</div>

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Marcus Maertens on 15 Jul 14

Finally! Nowadays blacks were always too bright for my taste...

<div class="cArrow"> </div><div class="cContentInner">Finally! Nowadays blacks were always too bright for my taste...</div>

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Ma Ru on 19 Jul 14

"No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it." I will keep waiting for my darkness-emitting diodes...

<div class="cArrow"> </div><div class="cContentInner">"No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it." I will keep waiting for my darkness-emitting diodes...</div>

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Dark matter may have been detected - streaming from the sun's core - 2 views

www.theguardian.com/...ark-matter-detected-sun-axions

dark matter xmm-newton

shared by Thijs Versloot on 20 Oct 14 - No Cached

LeopoldS and Christophe Praz liked it

Thijs Versloot on 20 Oct 14

An unusual signal picked up by a European space observatory could be the first direct detection of dark matter particles, astronomers say. The findings are tentative and could take several years to check, but if confirmed they would represent a dramatic advance in scientists' understanding of the universe.

<div class="cArrow"> </div><div class="cContentInner">An unusual signal picked up by a European space observatory could be the first direct detection of dark matter particles, astronomers say. The findings are tentative and could take several years to check, but if confirmed they would represent a dramatic advance in scientists' understanding of the universe.</div>

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Phys. Rev. Lett. 116, 031301 (2016) - Dark Matter Velocity Spectroscopy - 1 views

journals.aps.org/...PhysRevLett.116.031301

dark matter PHY

shared by jaihobah on 04 Feb 16 - No Cached

jaihobah on 04 Feb 16

'Whether mysterious high-energy photon emissions from our Galaxy come from dark matter or a more mundane source might be resolved by detecting their Doppler shifts along different lines-of-sight.'

<div class="cArrow"> </div><div class="cContentInner">'Whether mysterious high-energy photon emissions from our Galaxy come from dark matter or a more mundane source might be resolved by detecting their Doppler shifts along different lines-of-sight.'</div>

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Dark matter might predate Big Bang epoch - 2 views

journals.aps.org/...PhysRevLett.123.061302

physics PHY dark matter

shared by LeopoldS on 12 Aug 19 - No Cached

LeopoldS on 12 Aug 19

Dark matter (DM) may have its origin in a pre-big-bang epoch, the cosmic inflation.

<div class="cArrow"> </div><div class="cContentInner">Dark matter (DM) may have its origin in a pre-big-bang epoch, the cosmic inflation.</div>

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Hubble detects smallest known dark matter clumps - 1 views

phys.org/...bble-smallest-dark-clumps.html

hubble

shared by LeopoldS on 11 Jan 20 - No Cached

LeopoldS on 11 Jan 20

More info on dark matter ...

<div class="cArrow"> </div><div class="cContentInner">More info on dark matter ...</div>

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Phys. Rev. Lett. 110, 141102 (2013): First Result from the Alpha Magnetic Spectrometer ... - 0 views

prl.aps.org/...e141102

dark matter AMS ISS

shared by LeopoldS on 05 Apr 13 - No Cached

LeopoldS on 05 Apr 13

for Sante to review - or believe in dark matter :-)

<div class="cArrow"> </div><div class="cContentInner">for Sante to review - or believe in dark matter :-)</div>

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Dwarf planet could illuminate the dark sector - 1 views

physicsworld.com/...uld-illuminate-the-dark-sector

science gravity dark energy matter einstein

shared by Thijs Versloot on 17 Jul 14 - No Cached

Thijs Versloot on 17 Jul 14

A dwarf-planet candidate called UX25 and its tiny satellite could provide the first evidence of a new cosmological model that includes antigravity, say Alberto Vecchiato and Mario Gai of the Astrophysical Observatory of Turin in Italy.

<div class="cArrow"> </div><div class="cContentInner">A dwarf-planet candidate called UX25 and its tiny satellite could provide the first evidence of a new cosmological model that includes antigravity, say Alberto Vecchiato and Mario Gai of the Astrophysical Observatory of Turin in Italy.</div>

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GPS satellites suggest Earth is heavy with dark matter @NewScientist - 0 views

www.newscientist.com/...is-heavy-with-dark-matter.html

GPS darkmatter

shared by Thijs Versloot on 03 Jan 14 - No Cached

Thijs Versloot on 03 Jan 14

At a meeting of the American Geophysical Union in San Francisco in December, he reported an average figure that was between 0.005 and 0.008 per cent greater than the value for Earth's mass established by the International Astronomical Union. A disc of dark matter around the equator 191 kilometres thick and 70,000 km across can explain this, he says. Harris has yet to account for perturbations to the satellites' orbits due to relativity, and the gravitational pull of the sun and moon. Maybe relativistic GPS could improve this even further? As a side note however, the Juno spacecraft flyby showed an gravity acceleration which matched the calculations, casting doubts on the earlier calculations.

<div class="cArrow"> </div><div class="cContentInner">At a meeting of the American Geophysical Union in San Francisco in December, he reported an average figure that was between 0.005 and 0.008 per cent greater than the value for Earth's mass established by the International Astronomical Union. A disc of dark matter around the equator 191 kilometres thick and 70,000 km across can explain this, he says. Harris has yet to account for perturbations to the satellites' orbits due to relativity, and the gravitational pull of the sun and moon. Maybe relativistic GPS could improve this even further? As a side note however, the Juno spacecraft flyby showed an gravity acceleration which matched the calculations, casting doubts on the earlier calculations.</div>

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Chocolate Consumption, Cognitive Function, and Nobel Laureates - NEJM - 7 views

www.nejm.org/...NEJMon1211064

shared by Isabelle Dicaire on 12 Oct 12 - No Cached

LeopoldS liked it

Isabelle Dicaire on 12 Oct 12

Funny study about the correlation between chocolate consumption and Nobel laureates. Let's all eat chocolate then! :)

<div class="cArrow"> </div><div class="cContentInner">Funny study about the correlation between chocolate consumption and Nobel laureates. Let's all eat chocolate then! :)</div>

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...1 more comment...
Luzi Bergamin on 12 Oct 12

And the winner is... Finally I know why I'm so smart :D. Would like to meet Dr. Messerli (verry Swiss name, by the way) and have some dark Lindt chocolate together!

<div class="cArrow"> </div><div class="cContentInner">And the winner is... Finally I know why I'm so smart :D. Would like to meet Dr. Messerli (verry Swiss name, by the way) and have some dark Lindt chocolate together!</div>

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LeopoldS on 14 Oct 12

why Lindt chocolate ...??

<div class="cArrow"> </div><div class="cContentInner">why Lindt chocolate ...??</div>

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Luzi Bergamin on 15 Oct 12

"Dr. Messerli reports regular daily chocolate consumption, mostly but not exclusively in the form of Lindt's dark varieties."

<div class="cArrow"> </div><div class="cContentInner">"Dr. Messerli reports regular daily chocolate consumption, mostly but not exclusively in the form of Lindt's dark varieties."</div>

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Fuggedaboudit: Has Dark Matter Disappeared? | TIME.com - 6 views

science.time.com/...rk-matter-may-not-exist-at-all

science

shared by anonymous on 27 Feb 13 - No Cached

LeopoldS on 28 Feb 13

MOND again .... you might also have a look at this study: http://www.esa.int/gsp/ACT/doc/ARI/ARI%20Study%20Report/ACT-RPT-PHY-ARI-07-1301-Non-perturbative-effects-Vienna.pdf

<div class="cArrow"> </div><div class="cContentInner">MOND again .... you might also have a look at this study: <a href="http://www.esa.int/gsp/ACT/doc/ARI/ARI%20Study%20Report/ACT-RPT-PHY-ARI-07-1301-Non-perturbative-effects-Vienna.pdf" rel="nofollow" target="_blank">http://www.esa.int/gsp/ACT/doc/ARI/ARI%20Study%20Report/ACT-RPT-PHY-ARI-07-1301-Non-perturbative-effects-Vienna.pdf</a></div>

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Dark-matter alternative tackles elliptical galaxies - physicsworld.com - 0 views

physicsworld.com/...ve-tackles-elliptical-galaxies

PHY space

shared by santecarloni on 05 Oct 12 - No Cached

Debate Intensifies Over Dark Disk Theory | Quanta Magazine - 0 views

www.quantamagazine.org/ensifies-over-dark-disk-theory

PHY darkmatter

shared by jaihobah on 12 Apr 16 - No Cached

jaihobah on 12 Apr 16

An alternative idea to the standard WIMP halo picture for the DM distribution in the galaxy

<div class="cArrow"> </div><div class="cContentInner">An alternative idea to the standard WIMP halo picture for the DM distribution in the galaxy</div>

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