5 citations · 15 across the 10 of their papers we have counts for
10 papers
A note on oscillons: non-negligible metric fluctuations during preheating
Daniel del-Corral, Paolo Gondolo, K. Sravan Kumar +1
The dominant lattice approach to post-inflationary preheating and oscillon formation evolves an inhomogeneous inflaton field on a spatially homogeneous Friedmann-Lemaître-Robertson…
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…
A new understanding of Einstein-Rosen bridges
Enrique Gaztañaga, K. Sravan Kumar, João Marto
The formulation of quantum field theory in Minkowski spacetime, which emerges from the unification of special relativity and quantum mechanics, is based on treating time as a param…
Primordial black holes through preheating instabilities in -attractor models
Daniel del-Corral, Paolo Gondolo, K. Sravan Kumar +1
In this work, we explore the production of primordial black holes (PBHs) within the context of -attractor inflationary models, focusing on the preheating phase following inflati…
Scalar-Induced Gravitational Waves from self-resonant preheating in -attractor models
Daniel del-Corral, Paolo Gondolo, K. Sravan Kumar +1
After the inflationary phase, the universe enters the preheating phase, during which the inflaton field rolls down its potential and oscillates. When the potential significantly de…
Gravitational waves from primordial black hole dominance: The effect of inflaton decay rate
Daniel del-Corral, K. Sravan Kumar, João Marto
In this work, we explore primordial black holes (PBH) formation scenario during the post-inflationary preheating stage dominated by the inflaton field. We consider, in particular,…
Hawking radiation with pure states
K. Sravan Kumar, João Marto
Hawking's seminal work on black hole radiation highlights a critical issue in our understanding of quantum field theory in curved spacetime (QFTCS), specifically the problem of uni…
Revisiting quantum field theory in Rindler spacetime with superselection rules
K. Sravan Kumar, João Marto
Quantum field theory (QFT) in Rindler spacetime is a gateway to understanding unitarity and information loss paradoxes in curved spacetime. Rindler coordinates map Minkowski spacet…
Revisiting primordial black holes formation from preheating instabilities: the case of Starobinsky inflation
Daniel del-Corral, Paolo Gondolo, K. Sravan Kumar +1
In recent years, the formation of primordial black holes (PBH) in the early universe inflationary cosmology has garnered significant attention. One plausible scenario for primordia…