6 papers
Untangling PBH overproduction in -SIGWs generated by Pulsar Timing Arrays for MST-EFT of single field inflation
Sayantan Choudhury, Kritartha Dey, Ahaskar Karde
Our work highlights the crucial role played by the equation of state (EoS) parameter within the context of single field inflation with Multiple Sharp Transitions (MSTs) to unta…
Negative non-Gaussianity as a salvager for PBHs with PTAs in bounce
Sayantan Choudhury, Kritartha Dey, Siddhant Ganguly +3
Non-Gaussianity in the primordial curvature perturbation is a crucial element of the early universe due to its significant impact on the primordial black hole (PBH) production. In…
Primordial Black Holes from Effective Field Theory of Stochastic Single Field Inflation at NNNLO
Sayantan Choudhury, Ahaskar Karde, Pankaj Padiyar +1
We present a study of the Effective Field Theory (EFT) generalization of stochastic inflation in a model-independent single-field framework and its impact on primordial black hole…
Reconstructing inflationary potential from NANOGrav 15-year Data: A robust study using Non-Bunch Davies initial condition
Sayantan Choudhury
We discuss the theoretical framework behind reconstruction of a generic class of inflationary potentials for canonical single-field slow-roll inflation in a model-independent fashi…
Regularized-Renormalized-Resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation
Sayantan Choudhury, Ahaskar Karde, Sudhakar Panda +1
We present a complete and consistent exposition of the regularization, renormalization, and resummation procedures in the setup of having a contraction and then non-singular bounce…
Schwinger-Keldysh path integral formalism for a Quenched Quantum Inverted Oscillator
Sayantan Choudhury, Suman Dey, Rakshit Mandish Gharat +2
In this work, we study the time-dependent behaviour of quantum correlations of a system of an inverted oscillator governed by out-of-equilibrium dynamics using the well-known Schwi…