Type-II Weyl Semimetal vs Gravastar
TL;DR: In this article, the authors proposed to study the vacuum structure of the type II gravastar using the q-theory, where the vacuum variable is the 4-form field introduced for the phenomenological description of the quantum vacuum.
Abstract: The boundary between the type I and type II Weyl semimetals serves as the event horizon for the “relativistic” fermions. The interior of the black hole is represented by the type II Weyl semimetal, where the Fermi surface is formed. The process of the filling of the Fermi surface by electrons results in the relaxation inside the horizon. This leads to the Hawking radiation and to the reconstruction of the interior vacuum state. After the Fermi surface is fully occupied, the interior region reaches the equilibrium state, for which the Hawking radiation is absent. If this scenario is applicable to the real black hole, then the final state of the black hole will be the dark energy star with the event horizon. Inside the event horizon one would have de Sitter spacetime, which is separated from the event horizon by the shell of the Planck length width. Both the de Sitter part and the shell are made of the vacuum fields without matter. This is distinct from the gravastar, in which the matter shell is outside the “horizon,” and which we call the type I gravastar. However, this is similar to the other type of the vacuum black hole, where the shell is inside the event horizon, and which we call the type II gravastar. We suggest to study the vacuum structure of the type II gravastar using the q-theory, where the vacuum variable is the 4-form field introduced for the phenomenological description of the quantum vacuum.
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08 Dec 2022
TL;DR: In this paper , a quasiperiodic lattice model in a curved spacetime was constructed to explore the crossover concerning both condensed matter and curved space-time physics, and a self-consistent segmentation method was developed to calculate the analytical expression of the critical position of phase separation, and the rich phase diagram was determined by calculating the fractal dimension and scaling index in multifractal analysis.
Abstract: We construct a quasiperiodic lattice model in a curved spacetime to explore the crossover concerning both condensed matter and curved spacetime physics. We study the related Anderson localization and find that the model has a clear boundary of localized-extended phase separation, which leads to the mobility edge, i.e., the coexistence of nonergodic localized, critical and extended phases. A novel self-consistent segmentation method is developed to calculate the analytical expression of the critical position of phase separation, and the rich phase diagram is determined by calculating the fractal dimension and scaling index in multifractal analysis.
2 citations
TL;DR: In this article , a stationary spherically symmetric solution of the Einstein equations, with a source generated by a scalar of q-theory, is presented, where the energy density is localized within a thin spherical shell situated just outside of the horizon, analogous to a gravastar.
Abstract:
We present a stationary spherically symmetric solution of the Einstein equations, with a source generated by a scalar field of q-theory. In this theory Riemannian gravity, as described by the Einstein - Hilbert action, is coupled to a three - form field that describes the dynamical vacuum. Formally it behaves like a matter field with its own stress - energy tensor, equivalent to a scalar field minimally coupled to gravity. The asymptotically flat solutions obtained to the field equations represent black holes. For a sufficiently large horizon radius the energy density is localized within a thin spherical shell situated just outside of the horizon, analogous to a gravastar. The resulting solutions to the field equations, which admit this class of configurations, satisfy existence conditions that stem from the Black Hole no - hair theorem, thanks to the presence of a region in space in which the energy density is negative.
1 citations
TL;DR: In this article , a quasiperiodic lattice model in a curved spacetime was constructed to explore the crossover concerning both condensed matter and curved space-time physics, and it was shown that the model has a clear boundary of localized-extended phase separation, which leads to the mobility edge.
Abstract: We construct a quasiperiodic lattice model in a curved spacetime to explore the crossover concerning both condensed matter and curved spacetime physics. We study the related Anderson localization and find that the model has a clear boundary of localized-extended phase separation, which leads to the mobility edge, i.e
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15 May 2003TL;DR: In this article, the authors present a list of the top five most important categories of defense: 1. GRAVITY 7. MICROSCOPIC PHYSICS 13.2.
Abstract: 2. GRAVITY 7. MICROSCOPIC PHYSICS 13. TOPOLOGY OF DEFECTS 18. ANOMALOUS NON-CONSERVATION OF FERMIONIC CHARGE 22. EDGE STATES AND FERMION ZERO MODES ON SOLITON 26. LANDAU CRITICAL VELOCITY 29. CASIMIR EFFECT AND VACUUM ENERGY
2,450 citations
TL;DR: In this paper, it was shown that the same arguments which lead to black hole evaporation also predict that a thermal spectrum of sound waves should be given out from the sonic horizon in transsonic fluid flow.
Abstract: It is shown that the same arguments which lead to black-hole evaporation also predict that a thermal spectrum of sound waves should be given out from the sonic horizon in transsonic fluid flow.
1,492 citations
TL;DR: In this article, the authors overview the physics of exotic dark compact objects and their observational status, including the observational evidence for black holes with current and future experiments, and provide an overview of these objects.
Abstract: Very compact objects probe extreme gravitational fields and may be the key to understand outstanding puzzles in fundamental physics. These include the nature of dark matter, the fate of spacetime singularities, or the loss of unitarity in Hawking evaporation. The standard astrophysical description of collapsing objects tells us that massive, dark and compact objects are black holes. Any observation suggesting otherwise would be an indication of beyond-the-standard-model physics. Null results strengthen and quantify the Kerr black hole paradigm. The advent of gravitational-wave astronomy and precise measurements with very long baseline interferometry allow one to finally probe into such foundational issues. We overview the physics of exotic dark compact objects and their observational status, including the observational evidence for black holes with current and future experiments.
572 citations
TL;DR: A new final state of gravitational collapse is proposed, which has no singularities, no event horizons, and a global time and is thermodynamically stable and has no information paradox.
Abstract: A new final state of gravitational collapse is proposed By extending the concept of Bose–Einstein condensation to gravitational systems, a cold, dark, compact object with an interior de Sitter condensate pv = -ρv and an exterior Schwarzschild geometry of arbitrary total mass M is constructed These regions are separated by a shell with a small but finite proper thickness l of fluid with equation of state p = +ρ, replacing both the Schwarzschild and de Sitter classical horizons The new solution has no singularities, no event horizons, and a global time Its entropy is maximized under small fluctuations and is given by the standard hydrodynamic entropy of the thin shell, which is of the order kBlMc/, instead of the Bekenstein–Hawking entropy formula, SBH = 4πkBGM2/c Hence, unlike black holes, the new solution is thermodynamically stable and has no information paradox
569 citations
TL;DR: The spherically symmetric vacuum stress energy tensor with one assumption concerning its specific form generates the exact analytic solution of the Einstein equations which for larger coincides with the Schwarzschild solution, for smallr behaves like the de Sitter solution as mentioned in this paper.
Abstract: The spherically symmetric vacuum stress-energy tensor with one assumption concerning its specific form generates the exact analytic solution of the Einstein equations which for larger coincides with the Schwarzschild solution, for smallr behaves like the de Sitter solution and describes a spherically symmetric black hole singularity free everywhere.
550 citations