From the 1 of 16 linked papers with an AI index.
16 papers
Primordial black holes through preheating instabilities in -attractor models
Daniel del-Corral, Paolo Gondolo, K. Sravan Kumar +2
The paper investigates how primordial black holes can form during the preheating phase after α‑attractor inflation, using instability criteria and comparing the Press‑Schechter and…
Unitary Quadratic Quantum Gravity in 4D
K. Sravan Kumar, João Marto
In quadratic gravity, with a positive Weyl squared coefficient, the extra spin-2 sector is shown to correspond to a dual inverted harmonic oscillator, instead of a ghost. Using the…
Quantum (quadratic) gravity: replacing the massive tensor ghost with an inverted harmonic oscillator-like instability
K. Sravan Kumar, João Marto
The quadratic theory of gravity is the unique renormalizable theory of quantum gravity in 4 dimensions, as proved by K. S. Stelle in 1977. Over the decades, the theory has been und…
Gravitational Foundations and Exact Solutions in -Dimensional Fractional Cosmology
S. M. M. Rasouli, J. Marto, D. A. V. Oliveira +1
Three theoretically plausible techniques to developing a fractional scalar field cosmological model are pointed in this paper; the time-dependent kernel weighted action being then…
Hawking atmosphere of anti-de Sitter black holes
A. F. Cardona, C. Molina
This work investigates the semiclassical evolution of the Hawking atmosphere surrounding evaporating, spherically symmetric anti-de Sitter (adS) black holes. We model the evaporati…
Power-Law Inflation in n-Dimensional Fractional Scalar Field Cosmology: Observational Constraints and Dynamical Analysis
Daniel Oliveira, Seyed Rasouli, Joao Marto +1
Power-law inflation with is conceptually simple and predicts a scalar tilt compatible with CMB data, but in four-dimensional Einstein gravity it…