13 papers found.

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In this work, we study the quantum entanglement and compute entanglement entropy in de Sitter space for a bipartite quantum field theory driven by an axion originating from Type IIB string compactification on a Calabi–Yau three fold (\(\mathbf{CY^3}\)) and in the presence of an \(\mathbf{NS5}\) brane. For this computation, we consider a spherical surface \(\mathbf{S}^2\), which...

Abstract It has recently been demonstrated that the large N limit of a model of fermions charged under the global/gauge symmetry group O(N)q−1 agrees with the large N limit of the SYK model. In these notes we investigate aspects of the dynamics of the O(N)q−1 theories that differ from their SYK counterparts. We argue that the spectrum of fluctuations about the finite temperature...

In this work, we have developed an elegant algorithm to study the cosmological consequences from a huge class of quantum field theories (i.e. superstring theory, supergravity, extra dimensional theory, modified gravity, etc.), which are equivalently described by soft attractors in the effective field theory framework. In this description we have restricted our analysis for two...

In this work, we have studied the possibility of setting up Bell’s inequality violating experiment in the context of cosmology, based on the basic principles of quantum mechanics. First we start with the physical motivation of implementing the Bell inequality violation in the context of cosmology. Then to set up the cosmological Bell violating test experiment we introduce a model...

In this article, I have studied the cosmological and particle physics constraints on a generic class of large field (|Δϕ| > M p ) and small field (|Δϕ| < M p ) models of brane inflationary magnetic field from: (1) tensor-to-scalar ratio (r), (2) reheating, (3) leptogenesis and (4) baryogenesis in case of Randall-Sundrum single braneworld gravity (RSII) framework. I also establish...

Marg, Bhubaneswar, Odisha 751005 , India
2 **Sayantan** **Choudhury**: Presently working as a Visiting (Post-Doctoral) fellow at DTP, TIFR, Mumbai On lien from Harish-Chandra Research Institute , Allahabad

In this article, we propose different background models of extended theories of gravity, which are minimally coupled to the SM fields, to explain the possibility of genesis of dark matter without affecting the SM particle sector. We modify the gravity sector by allowing quantum corrections motivated from (1) local f(R) gravity and (2) non-minimally coupled gravity with SM sector...

We have studied primordial non-Gaussian features of a model of potential-driven single field DBI Galileon inflation. We have computed the bispectrum from the three-point correlation function considering all possible cross correlations between the scalar and tensor modes of the proposed setup. Further, we have computed the trispectrum from a four-point correlation function...

**Sayantan** **Choudhury**
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0
Physics and Applied Mathematics Unit, Indian Statistical Institute
, 203 B.T. Road, Kolkata 700 108,
India
In this paper I provide a general framework based on N formalism to

**Sayantan** **Choudhury**
1
Soumitra SenGupta
0
0
Department of Theoretical Physics, Indian Association for the Cultivation of Science
,
2A and 2B Raja S.C. Mullick Road, Kolkata 700 032
,
India
1
Physics

We have derived an effective potential for inflationary scenario from torsion and quantum gravity correction in terms of the scalar field hidden in torsion. A strict bound on the CP violating θ parameter, \( \mathcal{O}\left(1{0}^{-10}\right)<\theta <\mathcal{O}\left(1{0}^{-9}\right) \) has been obtained, using Planck+WMAP9 best fit cosmological parameters.

We propose a framework of modulus stabilization in two brane warped geometry scenario in presence of higher curvature gravity and dilaton in bulk space-time. In the prescribed setup we study various features of the stabilized potential for the modulus field, generated by a bulk scalar degrees of freedom with quartic interactions localized on the two 3-branes placed at the...

In this paper we will illustrate how to constrain unavoidable Kähler corrections for \( \mathcal{N} \) = 1 supergravity (SUGRA) inflation from the recent Planck data. We will show that the non-renormalizable Kähler operators will induce in general non-minimal kinetic term for the inflaton field, and two types of SUGRA corrections in the potential — the Hubble-induced mass (c H...