We investigate the production of primordial black holes and their contribution to the presently observed dark matter in a dilaton two-field extension of Starobinsky’s quadratic $f(R)$ model of inflation. The
Subleading BMS Charges and The Lorentz Group. (arXiv:2011.06008v1 [hep-th])
The extended BMS group includes supertranslation, dual supertranslation and Lorentz transformations. The generators of these symmetries can be classified according to their parity into “electric” and “magnetic” types. Using a
Constraints on ultralight scalar bosons within black hole spin measurements from LIGO-Virgo’s GWTC-2. (arXiv:2011.06010v1 [gr-qc])
Clouds of ultralight bosons – such as axions – can form around a rapidly spinning black hole, if the black hole radius is comparable to the bosons’ wavelength. The cloud
Solving Puzzles in Deformed JT Gravity: Phase Transitions and Non-Perturbative Effects. (arXiv:2011.06026v1 [hep-th])
Recent work has shown that certain deformations of the scalar potential in Jackiw-Teitelboim gravity can be written as double-scaled matrix models. However, some of the deformations exhibit an apparent breakdown
The Penrose process and BSW effect on the collision of particles in Kerr-Newman black hole by exerting the WGC conditions. (arXiv:2011.06119v1 [gr-qc])
As we know, there is an area around the event horizon of rotating black holes, which is called by ergosphere. The corresponding rotational energy of black holes is located to
An Argument for Strong Positivity of the Decoherence Functional. (arXiv:2011.06120v1 [quant-ph])
We give an argument for strong positivity of the decoherence functional as the correct, physical positivity condition in formulations of quantum theory based fundamentally on the path integral. We extend
Early warning of precessing compact binary merger with third-generation gravitational-wave detectors. (arXiv:2011.06130v1 [gr-qc])
Rapid localization of gravitational-wave events is important for the success of the multi-messenger observations. The forthcoming improvements and constructions of gravitational-wave detectors will enable detecting and localizing compact-binary coalescence events
2d TQFT and baby universes. (arXiv:2011.06137v1 [hep-th])
In this work, we extend a 2d topological gravity model of Marolf and Maxfield to have as its bulk action any open/closed TQFT obeying Atiyah’s axioms. The holographic duals of
Dynamics of test particles around a Bardeen black hole surrounded by perfect fluid dark matter. (arXiv:2011.06148v1 [gr-qc])
We study the dynamics of (i) neutral test particles, (ii) magnetically charged test particles, and (iii) test magnetic dipole around a regular Bardeen black hole surrounded by perfect fluid dark
Accretion disks around naked singularities. (arXiv:2011.06154v1 [gr-qc])
We investigate here the thermal properties of accretion disks in a spacetime for some galactic density profiles in spherical symmetry. The matter distributions have a finite outer radius with a
