76 citations · 1.3k across the 130 of their papers we have counts for
22 papers · 1 filter
Traversing a kinetic pole during inflation: primordial black holes and gravitational waves
Anish Ghoshal, Alessandro Strumia
We consider an inflationary kinetic function with an integrable pole that is traversed during inflation. This scenario leads to enhanced spectra of primordial scalar inhomogeneitie…
Non-perturbative quantum Yang--Mills at finite temperature beyond lattice: a Dyson--Schwinger approach
Marco Frasca, Anish Ghoshal, Stefan Groote
Using a Dyson--Schwinger approach, we perform an analysis of the non-trivial ground state of thermal Yang--Mills theory in the non-perturbative regime where chiral symmetry…
Probing the Dark Matter density with gravitational waves from super-massive binary black holes
Anish Ghoshal, Alessandro Strumia
Supermassive black hole binaries source gravitational waves measured by Pulsar Timing Arrays. The frequency spectrum of this stochastic background is predicted more precisely than…
Primordial non-Gaussianity as a probe of seesaw and leptogenesis
Chee Sheng Fong, Anish Ghoshal, Abhishek Naskar +2
We present the possibility that the seesaw mechanism and nonthermal leptogenesis can be {investigated} via primordial non-Gaussianities in the context of a majoron curvaton model.…
Did we hear the sound of the Universe boiling? Analysis using the full fluid velocity profiles and NANOGrav 15-year data
Tathagata Ghosh, Anish Ghoshal, Huai-Ke Guo +5
In this paper, we analyse sound waves arising from a cosmic phase transition where the full velocity profile is taken into account as an explanation for the gravitational wave spec…
Anomalies in String-inspired Non-local Extensions of QED
Fayez Abu-Ajamieh, Pratik Chattopadhyay, Anish Ghoshal +1
We investigate anomalies in the class of non-local field theories that have been proposed as an ultraviolet completion of 4-D Quantum Field Theory (QFT) with generalizing the kinet…
Cosmological probes of Grand Unification: Primordial Blackholes & scalar-induced Gravitational Waves
Anish Ghoshal, Ahmad Moursy, Qaisar Shafi
We investigate the inflationary cosmology involving an SU(5) GUT (grand unified theory) singlet scalar with non-minimal coupling to the Ricci scalar. In this scenario the scale of…
Yukawa theory in non-perturbative regimes: towards confinement, exact -function and conformal phase
Marco Frasca, Anish Ghoshal
We study possible hints towards confinement in a Z-invariant Yukawa system with massless fermions and a real scalar field in the strongly-coupled regime. Using the tools develo…
Post-inflationary production of particle Dark Matter: Hilltop and Coleman-Weinberg inflation
Anish Ghoshal, Maxim Yu. Khlopov, Zygmunt Lalak +1
We investigate the production of non-thermal dark matter (DM), , during post-inflationary reheating era. For inflation, we consider two slow roll single field inflationary scena…
Post-inflationary production of particle Dark Matter: non-minimal Natural and Coleman--Weinberg inflationary scenarios
Anish Ghoshal, Maxim Yu. Khlopov, Zygmunt Lalak +1
We investigate the production of non-thermal fermionic dark matter particles during the reheating era following slow roll inflation, driven by inflaton non-minimally coupled to…
Cosmic string gravitational waves from global symmetry breaking as a probe of the type I seesaw scale
Bowen Fu, Anish Ghoshal, Steve King
In type I seesaw models, the right-handed neutrinos are typically super-heavy, consistent with the generation of baryon asymmetry via standard leptogenesis. Primordial gravitationa…
Growth of curvature perturbations for PBH formation \& detectable GWs in non-minimal curvaton scenario revisited
Chao Chen, Anish Ghoshal, Zygmunt Lalak +2
We revisit the growth of curvature perturbations in non-minimal curvaton scenario with a non-trivial field metric where is an inflaton field, and incorporate the effect…
Axion-like particle (ALP) portal freeze-in dark matter confronting ALP search experiments
Dilip Kumar Ghosh, Anish Ghoshal, Sk Jeesun
The relic density of Dark Matter (DM) in the freeze-in scenario is highly dependent on the evolution history of the universe and changes significantly in a non-standard (NS) cosmol…
Measuring Inflaton Couplings via Primordial Gravitational Waves
Basabendu Barman, Anish Ghoshal, Bohdan Grzadkowski +1
We investigate the reach of future gravitational wave (GW) detectors in probing inflaton couplings with visible sector particles that can either be bosonic or fermionic in nature.…
Primordial Black Hole Archaeology with Gravitational Waves from Cosmic Strings
Anish Ghoshal, Yann Gouttenoire, Lucien Heurtier +1
Light primordial black holes (PBHs) with masses smaller than g () evaporate before the onset of Big-Bang nucleosynthesis, rendering their detection rather…
Imprints of a Supercooled Phase Transition in the Gravitational Wave Spectrum from a Cosmic String network
Francesc Ferrer, Anish Ghoshal, Marek Lewicki
A network of cosmic strings (CS), if present, would continue emitting gravitational waves (GW) as it evolves throughout the history of the Universe. This results in a characteristi…
Scale-invariant inflation
Massimiliano Rinaldi, Chiara Cecchini, Anish Ghoshal +1
We examine a scalar-tensor model of gravity that is globally scale-invariant. When adapted to a spatially flat Robertson-Walker metric, the equations of motion describe a dynamical…
Listening to dark sirens from gravitational waves:\it{Combined effects of fifth force, ultralight particle radiation, and eccentricity}
Tanmay Kumar Poddar, Anish Ghoshal, Gaetano Lambiase
We derive in detail the orbital period loss of a compact binary system in presence of a fifth force and radiation of ultralight particles for a general eccentric Keplerian orbit. W…
Renormalisable Non-local Quark-Gluon Interaction: Mass Gap, Chiral Symmetry Breaking & Scale Invariance
Arpan Chatterjee, Marco Frasca, Anish Ghoshal +1
We derive a Nambu--Jona-Lasinio (NJL) model from a non-local gauge theory and show that it has confining properties at low energies. In particular, we present an extended approach…
Measuring inflaton couplings via dark radiation as in CMB
Anish Ghoshal, Zygmunt Lalak, Shiladitya Porey
We study the production of a beyond the Standard Model (BSM) free-streaming relativistic particles which contribute to and investigate how much the predictions for the in…
Generalising Axion-like particle as the curvaton: sourcing primordial density perturbation and non-Gaussianities
Anish Ghoshal, Abhishek Naskar
We investigate the non-perturbatively generated axion-like particle (ALP) potential, involving fermions in the dark sector that couple to the ALP, in an early cosmological inflatio…
Impact of high-scale Seesaw and Leptogenesis on inflationary tensor perturbations as detectable gravitational waves
Maximilian Berbig, Anish Ghoshal
We discuss the damping of inflationary gravitational waves (GW) that re-enter the horizon before or during an epoch, where the energy budget of the universe is dominated by an unst…