Results 21 to 30 of about 681 (164)
Singularities in FLRW spacetimes
Physics Letters B, 2017 We point out that past-incompleteness of geodesics in FLRW spacetimes does not necessarily imply that these spacetimes start from a singularity. Namely, if a test particle that follows such a trajectory has a non-vanishing velocity, its energy was super-Planckian at some time in the past if it kept following that geodesic. That indicates a breakdown of
Lam, Huibert het, Prokopec, Tom
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Currents and radiation from the large D black hole membrane
Journal of High Energy Physics, 2017 It has recently been demonstrated that black hole dynamics in a large number of dimensions D reduces to the dynamics of a codimension one membrane propagating in flat space.
Sayantani Bhattacharyya +6 more
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Resolving spacetime singularities in flux compactifications & KKLT [PDF]
Journal of High Energy Physics, 2021 Abstract In flux compactifications of type IIB string theory with D3 and seven-branes, the negative induced D3 charge localized on seven-branes leads to an apparently pathological profile of the metric sufficiently close to the source. With the volume modulus stabilized in a KKLT de Sitter vacuum this pathological region takes over
Federico Carta, Jakob Moritz
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Probing phase structure of black holes with Lyapunov exponents
Journal of High Energy Physics, 2022 We conjecture that there exists a relationship between Lyapunov exponents and black hole phase transitions. To support our conjecture, Lyapunov exponents of the motion of particles and ring strings are calculated for Reissner-Nordström-AdS black holes ...
Xiaobo Guo +3 more
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Quantum vacuum effects on the formation of black holes
Journal of High Energy Physics, 2023 We study the backreaction of quantum fields induced through the vacuum polarization and the conformal anomaly on the collapse of a thin shell of dust. It is shown that the final fate of the collapse process depends on the physical properties of the shell,
Moslem Shafiee, Yousef Bahrampour
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, 2014 45 pages, LaTex; Invited Review article for the `Springer Handbook of Spacetime' (eds A. Ashtekar and V. Petkov)
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Resolving Spacetime Singularities within Asymptotic Safety [PDF]
Physical Review Letters, 2019 v2: some improvements and clarifications; version accepted for publication in ...
Bosma, Lando +3 more
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Black hole thermodynamics with conical defects
Journal of High Energy Physics, 2017 Recently we have shown [1] how to formulate a thermodynamic first law for a single (charged) accelerated black hole in AdS space by fixing the conical deficit angles present in the spacetime.
Michael Appels +2 more
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Journal of High Energy Physics, 2022 Thermal partition functions for gravitational systems have traditionally been studied using Euclidean path integrals. But in Euclidean signature the gravitational action suffers from the conformal factor problem, which renders the action unbounded below.
Donald Marolf
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Cosmological singularities in Bakry–Émery spacetimes
Journal of Geometry and Physics, 2014 15 pages; The wording of Theorem 1.5 is slightly clarified over the wording in the published version, with no change in the ...
Galloway, Gregory J., Woolgar, Eric
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