darkEnergy   108

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[gr-qc/0012094] Quantum Phase Transitions and the Breakdown of Classical General Relativity
“It is proposed that the event horizon of a black hole is a quantum phase transition of the vacuum of space-time analogous to the liquid-vapor critical point of a bose fluid. The equations of classical general relativity remain valid arbitrarily close to the horizon yet fail there through the divergence of a characteristic coherence length. The integrity of global time, required for conventional quantum mechanics to be defined, is maintained. The metric inside the event horizon is different from that predicted by classical general relativity and may be de Sitter space. The deviations from classical behavior lead to distinct spectroscopic and bolometric signatures that can, in principle, be observed at large distances from the black hole.”
darkenergy  boseeinsteincondensate  spacetime  quantumphysics  quantumcosmology  generalrelativity 
7 weeks ago by danhon
On the viability of gravitational Bose–Einstein condensates as alternatives to supermassive black holes | Monthly Notices of the Royal Astronomical Society | Oxford Academic
“It is argued that astrophysical Bose–Einstein condensates (BECs) most likely form through a quasi-static contraction of ultradense cores of neutron stars. Such an evolutionary track would ensure that there is sufficient time left for the nuclear matter to stably liberate the excess of thermal energy, enable the core’s matter to intercommunicate and undergo a phase transition to form stellar BECs.”
theoreticalphysics  blackholephysics  boseeinsteincondensate  darkenergy  neutronstar  astrophysics 
7 weeks ago by danhon
Dark Energy Stars
“Event horizons and closed time-like curves cannot exist in the real world for the simple reason that they are inconsistent with quantum mechanics. Following ideas originated by Robert Laughlin, Pawel Mazur, Emil Mottola, David Santiago, and the speaker it is now possible to describe in some detail what happens physically when one approaches and crosses a region of space-time where classical general relativity predicts there should be an infinite red shift surface. This quantum critical physics provides a new perspective on a variety of enigmatic astrophysical phenomena including supernovae explosions, gamma ray bursts, positron emission, and dark matter.,”
georgechapline  relativity  singularity  star  theoreticalphysics  quantummechanics  astrophysics  boseeinsteincondensate  blackholes  darkenergy  arxiv 
7 weeks ago by danhon
Are Black Holes Actually Dark Energy Stars? - Facts So Romantic - Nautilus
“Chapline and Laughlin argue that they can describe the collapsed stars that most scientists take to be black holes as regions where spacetime has undergone a phase transition. They find that the laws of general relativity are valid everywhere in the vicinity of the collapsed star, except at the event horizon, which marks the boundary between two different phases of spacetime.”
phasetransition  theoreticalphysics  spacetime  phasechange  bec  blackholes  boseeinsteincondensate  singularity  darkenergy 
7 weeks ago by danhon
Diving deep into the world of emergent gravity | Ars Technica
Getting rid of dark matter would be a big ordeal, so we talk to the man behind the theory.
feedly  cosmology  blackholes  ifttt  Archive  darkEnergy  darkMatter  entropy  generalRelativity  gravity 
may 2017 by otlib

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