76 citations · 1.3k across the 130 of their papers we have counts for
132 papers
Gauge Backreaction in Standard Model Warm Inflation
Rafid H. Dejrah, Anish Ghoshal
Standard-Model warm inflation (SMWI) makes QCD the microscopic origin of inflationary dissipation, so the real-time response of the gauge plasma enters the cosmological prediction.…
Statistical Fluctuations as Primordial Correlators in the CMB: Finite Chemical Potential Thermodynamics
Anish Ghoshal, Anupam Mazumdar, Bartłomiej Sikorski
Can primordial cosmological correlations originate from statistical fluctuations of an early-universe thermal system? We connect grand-canonical thermodynamics, stochastic transpor…
Primordial Black Hole Assisted Dirac Leptogenesis
Marco Manno, Anish Ghoshal
Dirac leptogenesis offers a qualitatively different route to the baryon asymmetry: total lepton number is conserved, but equal and opposite asymmetries are stored in the Standard M…
Impact of Scale-dependent Primordial Non-Gaussianity on Scalar-induced Gravitational Waves
Alisha Marriott-Best, Devanshu Sharma, Anish Ghoshal +1
Scalar-induced gravitational waves (SIGWs) probe primordial curvature perturbations beyond cosmic microwave background scales, while primordial black holes (PBHs) probe the rare ta…
Exact Lattice Identities and Continuum-Limit Dyson--Schwinger Equations for Yang-Mills Theory
Arpan Chatterjee, Marco Frasca, Anish Ghoshal +1
Starting from SU(N) on the lattice, we give a rigorous derivation of the Dyson--Schwinger equations in the continuum limit. We formulate the Dyson--Schwinger identities for the lat…
Magnetically assisted primordial scalar perturbations: Scalar-Induced Gravitational Waves
Arko Bhaumik, Theodoros Papanikolaou, Anish Ghoshal
Primordial magnetic fields (PMFs) provide a well-motivated source of cosmological perturbations through their anisotropic stress and may leave observable imprints in both the scala…
Particle production from bubble collisions
Anish Ghoshal, Pratyay Pal, Alessandro Strumia
Collisions of ultra-relativistic bubbles during cosmological phase transitions can produce particles much heavier than the transition scale. Previous analyses modelled this process…
Gravitational Waves from hybrid defects as probe of Flavor symmetry breaking: Machine-Learning Approach
Anish Ghoshal, Ilia Gogoladze, Amit Tiwari
We present a novel possibility that a network of domain walls bounded by cosmic strings generates a stochastic gravitational wave background (SWGB) signal originating from the spon…
Gaussian Process Reconstruction of Cosmological Parameters with Gravitational Wave Sirens using Machine Learning
Gourab Nandi, Anish Ghoshal, David F. Mota
Future gravitational wave (GW) standard siren catalogues will probe the late-time expansion history of the Universe across redshift ranges largely inaccessible to traditional elect…
Primordial Black Hole from Tensor-induced Density Fluctuation: First-order Phase Transitions and Domain Walls
Utkarsh Kumar, Anish Ghoshal
Gravitational waves generated by violent processes in the early Universe necessarily couple to scalar perturbations beyond linear order. We show that tensor perturbations produced…
Review of strongly coupled regimes in gravity with Dyson-Schwinger approach
Marco Frasca, Anish Ghoshal
We analyze various gravity theories involving de-Sitter, quadratic and non-minimally coupled scalar in the light of application of the Dyson-Schwinger technique inv…
Induced Multi-phase Inflation with Reheating: Leptogenesis and Dark Matter Production in Metric versus Palatini
Nilay Bostan, Rafid H. Dejrah, Anish Ghoshal +1
We study non-minimally coupled scalar-induced multi-phase inflation in metric and Palatini gravity, considering linear, Brans-Dicke-like, and Higgs-like sectors. The scalar spectra…
CMB signatures of gravity-mediated dark radiation in
Anish Ghoshal, Sk Jeesun, Kazunori Kohri
Measurement of in the CMB (Cosmic Microwave Background) observations, like Planck 2018 and BBN (Big Bang Nucleosynthesis) has already set stringent constraints on the…
Irreducible Gravitational Wave Background as a Particle Detector
Anish Ghoshal, Angus Spalding, Graham White
Beyond the standard model particles can imprint a temporary early matter-dominated epoch on a stochastic gravitational-wave background. For a freely propagating background whose pr…
Primordial Magnetogenesis and Gravitational Waves from ALP-assisted Phase Transition
Pankaj Borah, P. S. Bhupal Dev, Anish Ghoshal
Sufficiently strong first-order phase transitions (FOPTs) in the early Universe can simultaneously produce an observable stochastic gravitational wave background (SGWB) and a large…
INFLAVON: CMB as cosmic tracer of Flavor physics
Mu-Chun Chen, Anish Ghoshal, V. Knapp-Perez +3
We unify one of the most widely studied frameworks to explain the hierarchical structure of the flavor sector in the Standard Model, the Froggatt-Nielsen mechanism, with cosmic inf…
Cosmic Collider Gravitational Waves sourced by Right-handed Neutrino production from Bubbles: Testing Seesaw, Leptogenesis and Dark Matter
Anish Ghoshal, Pratyay Pal
We study a minimal type-I seesaw framework in which a first-order phase transition (FOPT), driven by a singlet scalar, produces right-handed neutrinos (RHNs) through bubble collisi…
Cosmic Strings Gravitational Wave Probe of Leptogenesis: Thermal, Non-thermal, Near-resonant and Flavourful
Anish Ghoshal, Angus Spalding, Graham White
Breaking a global or local symmetry at high scales simultaneously generates Majorana masses for heavy right-handed neutrinos and produces a network of cosmic strin…
Grand Unification Higgs- Inflation: Complementarity between Proton Decay and CMB Observables
Nilay Bostan, Rafid H. Dejrah, Anish Ghoshal
We propose a predictive Grand Unified Theory (GUT) framework for cosmic inflation in the Palatini formulation of gravity. In this model, a GUT Higgs field…
Gravitational Wave Spectral Shapes as a probe of Long Lived Right-handed Neutrinos, Leptogenesis and Dark Matter: Global versus Local B-L Cosmic Strings
Satyabrata Datta, Anish Ghoshal, Angus Spalding +1
The scale of the seesaw mechanism is typically much larger than the electroweak scale. This hierarchy can be naturally explained by symmetry, which after spontaneous s…
CMB observables and reheat temperature as a window to models of inflation and freeze-in dark matter production
Anish Ghoshal, Paweł Kozów, Marek Olechowski +1
A systematic approach is presented for using CMB observables and reheating temperature for discriminating between various models of inflation and certain freeze-in dark matter scen…
Testing Seesaw and Leptogenesis via Gravitational Waves: Majorana versus Dirac
Anish Ghoshal, Kazunori Kohri, Nimmala Narendra
We investigate the B-L gauge extension of the Standard Model that the Dirac seesaw mechanism with thermal Leptogenesis can be tested using the stochastic gravitational background (…
Impact of Non-Thermal Leptogenesis with Early Matter Domination on Gravitational Waves from First-order Phase Transition
Dilip Kumar Ghosh, Anish Ghoshal, Koustav Mukherjee +2
We study the impact of non-thermal leptogenesis on the spectrum of gravitational waves (GWs) produced by a strong first-order phase transition in the early Universe. We consider a…
Minimal Multi-Majoron Model
Bowen Fu, Anish Ghoshal, Stephen F. King
In order to provide a natural framework for hierarchical right-handed neutrinos, we propose a realistic ultraviolet complete minimal multi-Majoron model (MMMM). We consider two rig…