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Oct 23, 2024 | 
epjc.epj.org | Marco Frasca |Anish Ghoshal
Eur. Phys. J. C (2024) 84: 1101https://doi.org/10.1140/epjc/s10052-024-13458-2Regular Article - Theoretical Physics Yukawa theory in non-perturbative regimes: towards confinement, exact β-function and conformal phase1a and 2 1 , Rome, Italy 2 Faculty of Physics, Institute of Theoretical Physics, University of Warsaw, ul.
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Apr 15, 2024 | 
link.aps.org | Anish Ghoshal |Nobuchika Okada |Fayez Abu-Ajamieh |Pratik Chattopadhyay
We investigate anomalies in the class of nonlocal field theories that have been proposed as an ultraviolet completion of four-dimensional quantum field theory with generalizing the kinetic energy operators to an infinite series of higher derivatives inspired by the string field theory and ghost-free nonlocal approaches to quantum gravity. We explicitly calculate the vector and chiral anomalies in a string-inspired nonlocal extension of QED.
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Apr 12, 2024 | 
mdpi.com | Arpan Chatterjee |Marco Frasca |Anish Ghoshal |Stefan Groote
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Mar 29, 2024 | 
link.aps.org | Anish Ghoshal |Maxim Yu. Khlopov |Southern Federal |Zygmunt Lalak
We investigate the production of nonthermal dark matter (DM), χ, during the postinflationary reheating era. For inflation, we consider two slow roll single field inflationary scenarios—generalized version of Hilltop (GH) inflation, and Coleman-Weinberg (CW) inflation.
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Jan 22, 2024 | 
link.aps.org | Anish Ghoshal |Pankaj Saha
We describe the challenges and pathways when probing inflaton as dark matter with the stochastic gravitational waves (GWs) signal generated during the (p)reheating. Such scenarios are of utmost interest when no other interaction between the visible and dark sectors is present, therefore having no other detectability prospects. We consider the remnant energy in the coherently oscillating inflaton’s zeroth mode to contribute to the observed relic dark matter density in the Universe.
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Sep 29, 2023 | 
link.aps.org | Anish Ghoshal |Qaisar Shafi |Ahmad Moursy
We investigate the inflationary cosmology involving an SU(5) GUT (grand unified theory) singlet scalar with nonminimal coupling to the Ricci scalar. In this scenario the scale of grand unification is set by the inflaton vacuum expectation value when the inflaton rolls down its potential towards its minimum v, thereby relating inflationary dynamics to GUT symmetry breaking with a prediction of r≃0.025 for the tensor-to-scalar ratio to be tested by the next generation of CMB experiments.
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Sep 25, 2023 | 
link.aps.org | Anish Ghoshal |Shiladitya Porey |Zygmunt Lalak
We study the production of a beyond the Standard Model (BSM) free-streaming relativistic particles which contribute to Neff and investigate how much the predictions for the inflationary analysis change.
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Aug 24, 2023 | 
link.aps.org | Basabendu Barman |Centro de Investigaciones |Universidad Antonio Nariño |Anish Ghoshal
We explore the possibility of probing freeze-in dark matter (DM) produced via the right-handed neutrino (RHN) portal using the RHN search experiments. We focus on a simplified framework of minimally-extended type-I seesaw model consisting of only four free parameters, namely the RHN mass, the fermionic DM mass, the Yukawa coupling between the DM and the RHN, and a real singlet scalar mass.
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Aug 16, 2023 | 
link.aps.org | Anish Ghoshal |Graham White |Kavli IPMU
Inflaton seeds nonthermal leptogenesis by pair-producing right-handed neutrinos in the seesaw model. We show that the inevitable graviton bremsstrahlung associated with inflaton decay can be a unique probe of nonthermal leptogenesis. The emitted gravitons contribute to a high-frequency stochastic gravitational waves background with a characteristic fall-off below the peak frequency.
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May 10, 2023 | 
link.aps.org | Alessandro Di Marco |Amit Banik |Anish Ghoshal |Gianfranco Pradisi
Abstract We discuss how a post-inflationary reheating phase characterized by a nonstandard multiple scalar field cosmology can change the thermal history of the Universe, affecting minimal high-scale leptogenesis. In particular, we explore a class of models where a set of scalar fields in a brane-inspired dynamical scenario modifies the Boltzmann equations concerning standard leptogenesis.
