Large fluctuations and primordial black holes

S Choudhury, M Sami - Physics Reports, 2025‏ - Elsevier
In this paper, we review in detail different mechanisms of generation of large primordial
fluctuations and their implications for the production of primordial black holes (PBHs) and …

Quantum loop effects on the power spectrum and constraints on primordial black holes

S Choudhury, S Panda, M Sami - Journal of Cosmology and …, 2023‏ - iopscience.iop.org
We present a detailed exposition on the prospects of the formation of Primordial Black Holes
(PBHs) during Slow Roll (SR) to Ultra Slow Roll (USR) sharp transitions in the framework of …

Galileon inflation evades the no-go for PBH formation in the single-field framework

S Choudhury, S Panda, M Sami - Journal of Cosmology and …, 2023‏ - iopscience.iop.org
We consider Galileon inflation in the Effective Field Theory (EFT) framework and examine
the possibility for PBH formation during slow roll (SR) to ultra slow roll (USR) transitions. We …

Inflation, the Hubble tension, and early dark energy: An alternative overview

W Giarè - Physical Review D, 2024‏ - APS
I review and discuss the possible implications for inflation resulting from considering new
physics in light of the Hubble tension. My study is motivated by a simple argument that the …

[HTML][HTML] Primordial non-Gaussianity as a saviour for PBH overproduction in SIGWs generated by Pulsar Timing Arrays for Galileon inflation

S Choudhury, K Dey, A Karde, S Panda, M Sami - Physics Letters B, 2024‏ - Elsevier
We investigate the explicit role of negative local non-Gaussianity, f NL, in suppressing the
abundance of primordial black holes (PBHs) in the single-field model of Galileon inflation …

Primordial black holes from single-field inflation: a fine-tuning audit

PS Cole, AD Gow, CT Byrnes… - Journal of Cosmology and …, 2023‏ - iopscience.iop.org
All single-field inflationary models invoke varying degrees of tuning in order to account for
cosmological observations. Mechanisms that generate primordial black holes (PBHs) from …

Realisation of the ultra-slow roll phase in Galileon inflation andPBH overproduction

S Choudhury, A Karde, S Panda… - Journal of Cosmology …, 2024‏ - iopscience.iop.org
We demonstrate the explicit realisation of the ultra-slow roll phase in the framework of the
effective field theory of single-field Galileon inflation. The pulsar timing array (PTA) …

Primordial perturbations from ultra-slow-roll single-field inflation with quantum loop effects

SL Cheng, DS Lee, KW Ng - Journal of Cosmology and …, 2024‏ - iopscience.iop.org
It is known that the single-field inflation with a transient ultra-slow-roll phase can produce a
large curvature perturbation at small scales for the formation of primordial black holes. In our …

Primordial black holes as dark matter: interferometric tests of phase transition origin

I Baldes, MO Olea-Romacho - Journal of High Energy Physics, 2024‏ - Springer
A bstract We show that primordial black holes—in the observationally allowed mass window
with f PBH= 1—formed from late nucleating patches in a first order phase transition imply …

Multi-field inflation with large scalar fluctuations: non-Gaussianity and perturbativity

L Iacconi, DJ Mulryne - Journal of Cosmology and Astroparticle …, 2023‏ - iopscience.iop.org
Recently multi-field inflation models that can produce large scalar fluctuations on small
scales have drawn a lot of attention, primarily because they could lead to primordial black …