Group items tagged neutrons - Advanced Concepts Team

Neutron Star Formation Could Awaken the Vacuum | Physical Review Focus - 0 views

focus.aps.org/st14

phy quantum_field_theory general_relativity

shared by pacome delva on 05 Nov 10 - No Cached

Lima and Vanzella joined with George Matsas of São Paulo State University in their latest work to examine a model of the highly-curved spacetime that appears during formation of an ultradense neutron star. For some reasonable values of the mass and size of the star, they predict that the vacuum energy will grow within milliseconds for some values of the coupling parameter. At this point the vacuum energy would begin to induce additional gravitational effects, which they haven't yet calculated, so they don't know how the star would be affected. If further research shows such a neutron star to be unstable, the existence of stable neutron stars of particular sizes could rule out the existence fields of the type they modeled.
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Effectively Universal Behavior of Rotating Neutron Stars in General Relativity Makes Th... - 0 views

journals.aps.org/...PhysRevLett.112.121101

shared by Thijs Versloot on 02 Apr 14 - No Cached

Thijs Versloot on 02 Apr 14

Recently, it was shown that slowly rotating neutron stars exhibit an interesting correlation between their moment of inertia I, their quadrupole moment Q, and their tidal deformation Love number λ (the I-Love-Q relations), independently of the equation of state of the compact object. By exploiting this relation, we can describe quite accurately the geometry around a neutron star with fewer parameters, even if we don't know precisely the equation of state. Side note: I-Love-Q relations? Some inner chuckles in the Fundamental Physicist community.. :)

<div class="cArrow"> </div><div class="cContentInner">Recently, it was shown that slowly rotating neutron stars exhibit an interesting correlation between their moment of inertia I, their quadrupole moment Q, and their tidal deformation Love number λ (the I-Love-Q relations), independently of the equation of state of the compact object. By exploiting this relation, we can describe quite accurately the geometry around a neutron star with fewer parameters, even if we don't know precisely the equation of state. Side note: I-Love-Q relations? Some inner chuckles in the Fundamental Physicist community.. :)</div>

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[1610.08323] Evidence for vacuum birefringence from the first optical polarimetry measu... - 3 views

arxiv.org/1610.08323

shared by fichbio on 02 Dec 16 - No Cached

fichbio on 02 Dec 16

Abstract: The "Magnificent Seven" (M7) are a group of radio-quiet Isolated Neutron Stars (INSs) discovered in the soft X-rays through their purely thermal surface emission. Owing to the large inferred magnetic fields ($B\approx 10^{13}$ G), radiation from these sources is expected to be substantially polarised, independently on the mechanism actually responsible for the thermal emission.

<div class="cArrow"> </div><div class="cContentInner">Abstract: The "Magnificent Seven" (M7) are a group of radio-quiet Isolated Neutron Stars (INSs) discovered in the soft X-rays through their purely thermal surface emission. Owing to the large inferred magnetic fields ($B\approx 10^{13}$ G), radiation from these sources is expected to be substantially polarised, independently on the mechanism actually responsible for the thermal emission.</div>

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'Perfect' Liquid Hot Enough to be Quark Soup - 0 views

www.bnl.gov/...PR_display.asp

PHY accelerator

shared by LeopoldS on 18 Feb 10 - Cached

LeopoldS on 18 Feb 10

Protons, neutrons melt to produce 'quark-gluon plasma' at RHIC .... hot stuff

<div class="cArrow"> </div><div class="cContentInner">Protons, neutrons melt to produce 'quark-gluon plasma' at RHIC .... hot stuff</div>

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Nicholas Lan on 23 Feb 10

posted already further down

<div class="cArrow"> </div><div class="cContentInner">posted already further down</div>

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Chandra finds superfluid in neutron star's core - 1 views

www.physorg.com/...ce-uncovered-neutron-star.html

shared by duncan barker on 24 Feb 11 - No Cached

Cubic neutrons might find it hip to be square - physicsworld.com - 2 views

physicsworld.com/...46908

physics neutrons

shared by santecarloni on 24 Aug 11 - No Cached

santecarloni on 24 Aug 11

Who said that particles are round?

<div class="cArrow"> </div><div class="cContentInner">Who said that particles are round?</div>

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Possible gamma ray burst detected in Andromeda - 0 views

www.fromquarkstoquasars.com/ay-burst-detected-in-andromeda

science gamma ray supernova

shared by Thijs Versloot on 28 May 14 - No Cached

Thijs Versloot on 28 May 14

Short GRBS are formed when neutron stars (in a binary system) slam into one another. On the other hand, long GRBs are a result of massive stars going supernova. Stars end their lives in violent explosions, typically leaving behind remnants like neutron stars.

<div class="cArrow"> </div><div class="cContentInner">Short GRBS are formed when neutron stars (in a binary system) slam into one another. On the other hand, long GRBs are a result of massive stars going supernova. Stars end their lives in violent explosions, typically leaving behind remnants like neutron stars.</div>

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Evidence for Water Ice Near Mercury's North Pole from MESSENGER Neutron Spectrometer Me... - 1 views

www.sciencemag.org/...science.1229953.abstract

Mercury water messenger

shared by LeopoldS on 30 Nov 12 - No Cached

LeopoldS on 30 Nov 12

Water ice on mercury!!!

<div class="cArrow"> </div><div class="cContentInner">Water ice on mercury!!!</div>

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Quantum #teleportation theory to be tested on the #ISS - 8 views

phys.org/...eleportation-theory-space.html

science quantum ISS

shared by Thijs Versloot on 22 Oct 13 - No Cached

LeopoldS and annaheffernan liked it

Thijs Versloot on 22 Oct 13

A theory-SuperDense quantum teleportation-posed by Hampshire College physics professor Herbert Bernstein will be tested on the International Space Station. Theoretical physicist Bernstein devised the SuperDense scheme more than a decade ago in his investigations of different ways to send a quantum state from one part of a laboratory to a remote station.

<div class="cArrow"> </div><div class="cContentInner">A theory-SuperDense quantum teleportation-posed by Hampshire College physics professor Herbert Bernstein will be tested on the International Space Station. Theoretical physicist Bernstein devised the SuperDense scheme more than a decade ago in his investigations of different ways to send a quantum state from one part of a laboratory to a remote station.</div>

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LeopoldS on 27 Oct 13

Anna could you have a closer look into this - we should at least know what they are up to, be able to explain if anybody asks ... I also somehow missed this one in the NIAC study descriptions ... maybe a good moment to have another look at these "This is the second NASA grant for SuperDense quantum teleportation. A grant awarded in 2010 through NASA Innovative Advanced Concepts (NIAC) investigated the viability of the theory and produced the world's first experimental demonstration. Surprising or seminal experiments have marked Bernstein's research career. This is the fourth time a major proposal has become reality; two of his experiments helped found new sub-fields of physics (neutron interferometry and entanglement for quantum information)."

<div class="cArrow"> </div><div class="cContentInner">Anna could you have a closer look into this - we should at least know what they are up to, be able to explain if anybody asks ... I also somehow missed this one in the NIAC study descriptions ... maybe a good moment to have another look at these "This is the second NASA grant for SuperDense quantum teleportation. A grant awarded in 2010 through NASA Innovative Advanced Concepts (NIAC) investigated the viability of the theory and produced the world's first experimental demonstration. Surprising or seminal experiments have marked Bernstein's research career. This is the fourth time a major proposal has become reality; two of his experiments helped found new sub-fields of physics (neutron interferometry and entanglement for quantum information)."</div>

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Better Nanotubes May Be on the Way -- Fox 2009 (1210): 3 -- ScienceNOW - 1 views

sciencenow.sciencemag.org/...3

phy nan carbon_nanotubes

shared by pacome delva on 14 Dec 09 - Cached

Success at building large amounts of inexpensive nanotubes opens the door for lighter, faster car frames; affordable space vehicles; and ultralightweight armor. Or on a smaller level, BNNTs could be used with pinpoint precision to attack cancer cells by sticking to tumors, absorbing neutrons from a targeted beam, and generating localized alpha radiation to kill the cancer. "This is the start of a revolution in materials," says Dennis Bushnell, a NASA engineer who has watched the work closely in the hopes of using BNNTs for space vehicles.
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Vanishing star hints at direct collapse to black hole - 0 views

arstechnica.com/...-direct-collapse-to-black-hole

PHY space blackhole

shared by jaihobah on 31 May 17 - No Cached

jaihobah on 31 May 17

The rules for a stellar death seem pretty simple. If the star isn't that massive, it burns out into a carbon-rich remnant called a white dwarf. If it's big enough, the star ends in a bang, exploding in a supernova that can leave behind a neutron star or a black hole.

<div class="cArrow"> </div><div class="cContentInner">The rules for a stellar death seem pretty simple. If the star isn't that massive, it burns out into a carbon-rich remnant called a white dwarf. If it's big enough, the star ends in a bang, exploding in a supernova that can leave behind a neutron star or a black hole.</div>

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