76 citations · 1.3k across the 130 of their papers we have counts for
23 papers · 1 filter
Probing baryogenesis with gravitational waves
Yanou Cui, Anish Ghoshal, Pankaj Saha +1
Affleck-Dine (AD) baryogenesis is compelling yet challenging to probe because of the high-energy physics involved. We demonstrate that this mechanism can be generically realized wi…
Is inflationary magnetogenesis sensitive to the post-inflationary history ?
Konstantinos Dimopoulos, Anish Ghoshal, Theodoros Papanikolaou
Considering inflationary magnetogenesis induced by time-dependent kinetic and axial couplings of a massless Abelian vector boson field breaking the conformal invariance we show in…
Primordial Black Holes and Second-order Gravitational Waves in Axion-like Hybrid Inflation
Waqas Ahmed, Anish Ghoshal, Umer Zubair
We investigate the possibility that primordial black holes (PBHs) can be formed from large curvature perturbations generated during the waterfall phase transition in a hybrid infla…
Unified Origin of Curvature Perturbation and Baryon Asymmetry of the Universe
Anish Ghoshal, Abhishek Naskar, Nobuchika Okada
We propose a unified framework that describes both the curvaton mechanism for generating primordial density fluctuations and the Affleck-Dine (AD) mechanism for baryogenesis. By in…
Non-perturbative Origin of the Electroweak Scale with Dyson-Schwinger: Fermionic Mass Gap and Higher-order Excitations
Marco Frasca, Anish Ghoshal, Nobuchika Okada
We study interaction of a fermion field with a scalar field and analyze the spectrum of the theory obtained in this way. It is shown that due to non-perturbative dynamics i…
Stochastic Axion-like Curvaton: Non-Gaussianity and Primordial Black Holes Without Large Power Spectrum
Chao Chen, Anish Ghoshal, Gianmassimo Tasinato +1
We discuss a mechanism of primordial black hole (PBH) formation that does not require specific features in the inflationary potential, revisiting previous literature. In this mecha…
Gravitational waves and black holes from the phase transition in models of dynamical symmetry breaking
Martín Arteaga, Anish Ghoshal, Alessandro Strumia
Theories of dynamical electroweak symmetry breaking predict a strong first order cosmological phase transition: we compute the resulting signals, primordial black holes and gravita…
Exploring cosmological gravitational wave backgrounds through the synergy of LISA and ET
Alisha Marriott-Best, Debika Chowdhury, Anish Ghoshal +1
The gravitational wave (GW) interferometers LISA and ET are expected to be functional in the next decade(s), possibly around the same time. They will operate over different frequen…
Cosmological collider non-Gaussianity from multiple scalars and gravity
Shuntaro Aoki, Anish Ghoshal, Alessandro Strumia
Cosmological collider signals of primordial non-Gaussianity arise at tree level when an extra scalar has Hubble mass during inflation. We critically review the formalism finding th…
Non-perturbative Origin of Electroweak Scale via Higgs-portal: Dyson-Schwinger in Conformally Invariant Scalar Sector
Marco Frasca, Anish Ghoshal, Nobuchika Okada
We investigate conformally extended Standard Model with a hidden scalar . It is shown that due to non-perturbative dynamics in the hidden sector, develops a vacuum expectati…
Dynamical generation of electroweak scale from the conformal sector: A strongly coupled Higgs via the Dyson--Schwinger approach
Arpan Chatterjee, Marco Frasca, Anish Ghoshal +1
We propose a novel pathway to generate the electroweak (EW) scale via non-perturbative dynamics of a conformally invariant scalar sector at the classical level. We provide a method…
Primordial Black Holes and Scalar-induced Gravitational Waves in Sneutrino Hybrid Inflation
Adeela Afzal, Anish Ghoshal, Stephen F. King
We investigate the possibility that primordial black holes (PBHs) can be formed from large curvature perturbations generated during the waterfall phase transition in a supersymmetr…
Double Inflation in Classically Conformal Model
Anish Ghoshal, Nobuchika Okada, Arnab Paul +1
It has recently been shown in Ref. [1] that the double-inflation scenario based on the Coleman-Weinberg potential can successfully generate primordial black holes (PBHs) with the i…
Primordial Gravitational Waves as Probe of Dark Matter in Interferometer Missions: Fisher Forecast and MCMC
Anish Ghoshal, Debarun Paul, Supratik Pal
We propose novel inflationary primordial gravitational wave (GW) spectral shapes at interferometer-based current and future GW missions to test dark matter (DM) production via grav…
Inflationary Gravitational Wave Spectral Shapes as test for Low-Scale Leptogenesis
Zafri A. Borboruah, Anish Ghoshal, Lekhika Malhotra +1
We study non-thermal resonant leptogenesis in a general setting where a heavy majoron decays to right-handed neutrinos (RHNs) whose further out-of-equilibrium decay generates t…
Probing flavor violation and baryogenesis via primordial gravitational waves
Zafri A. Borboruah, Anish Ghoshal, Seyda Ipek
We show that observations of primordial gravitational waves of inflationary origin can shed light into the scale of flavor violation in a flavon model which also explains the mass…
Enhanced primordial gravitational waves from a stiff post-inflationary era due to an oscillating inflaton
Chao Chen, Konstantinos Dimopoulos, Cem Eröncel +1
We investigate two classes of inflationary models, which lead to a stiff period after inflation that boosts the signal of primordial gravitational waves (GWs). In both families of…
Type-I two-Higgs-doublet model and gravitational waves from domain walls bounded by strings
Bowen Fu, Anish Ghoshal, Stephen F. King +1
The spontaneous breaking of a symmetry via an intermediate discrete symmetry may yield a hybrid topological defect of \emph{domain walls bounded by cosmic strings}. The deca…
Non-perturbative Origin of the Electroweak Scale: RGE in Strongly-coupled Dark Gauge Theories via Dyson-Schwinger
Marco Frasca, Anish Ghoshal, Nobuchika Okada
We propose a novel pathway to generate the electroweak scale (EW) via non-perturbative dynamics of a dark gauge sector based on the SU(N) gauge group. Imposing the scale invariance…
Primordial Black Holes and Scalar-induced Gravitational Waves in Radiative Hybrid Inflation
Adeela Afzal, Anish Ghoshal
We study the possibility that primordial black holes (PBHs) can be formed from large curvature perturbations generated during the waterfall phase transition due to the effects of o…
Superradiant Leptogenesis
Anish Ghoshal, Yuber F. Perez-Gonzalez, Jessica Turner
We investigate how superradiance affects the generation of baryon asymmetry in a universe with rotating primordial black holes, considering a scenario where a scalar boson is coupl…
Post-inflationary Leptogenesis and Dark Matter production: Metric versus Palatini formalism
Anish Ghoshal, Zygmunt Lalak, Supratik Pal +1
We investigate production of non-thermal dark matter particles and heavy sterile neutrinos from inflaton during the reheating era, which is preceded by a slow-roll inflationary epo…
Slaying Axion-Like Particles via Gravitational Waves and Primordial Black Holes from Supercooled Phase Transition
Angela Conaci, Luigi Delle Rose, P. S. Bhupal Dev +1
We study the formation of primordial black holes (PBHs) from density fluctuations due to supercooled phase transitions (PTs) triggered in an axion-like particle (ALP) model. We fin…