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