Single field inflation in the light of NANOGrav 15-year Data: Quintessential interpretation of blue tilted tensor spectrum through Non-Bunch Davies initial condition
S Choudhury - arXiv preprint arXiv:2307.03249, 2023 - arxiv.org
In this work, we present a quintessential interpretation of having a blue-tilted tensor power
spectrum for canonical single-field slow-roll inflation to explain the recently observed …
spectrum for canonical single-field slow-roll inflation to explain the recently observed …
On the initial singularity and extendibility of flat quasi-de Sitter spacetimes
A bstract Inflationary spacetimes have been argued to be past geodesically incomplete in
many situations. However, whether the geodesic incompleteness implies the existence of an …
many situations. However, whether the geodesic incompleteness implies the existence of an …
Single field inflation in the light of Pulsar Timing Array Data: quintessential interpretation of blue tilted tensor spectrum through Non-Bunch Davies initial condition
S Choudhury - The European Physical Journal C, 2024 - Springer
In this work, we present a quintessential interpretation of having a blue-tilted tensor power
spectrum for canonical single-field slow-roll inflation to explain the recently observed Pulsar …
spectrum for canonical single-field slow-roll inflation to explain the recently observed Pulsar …
[HTML][HTML] A small Universe
JL Lehners, J Quintin - Physics Letters B, 2024 - Elsevier
Many cosmological models assume or imply that the total size of the universe is very large,
perhaps even infinite. Here we argue instead that the universe might be comparatively …
perhaps even infinite. Here we argue instead that the universe might be comparatively …
Probe of spatial geometry from scalar induced gravitational waves
U Kumar, U Thattarampilly, P Chaturvedi - arXiv preprint arXiv:2410.12931, 2024 - arxiv.org
We investigate a novel probe of spatial geometry of the Universe through the observation of
gravitational waves (GWs) induced by first order curvature perturbations. The existence of …
gravitational waves (GWs) induced by first order curvature perturbations. The existence of …
Reconstructing inflationary potential from NANOGrav 15-year data: A robust study using Non-Bunch Davies initial condition
S Choudhury - Journal of High Energy Astrophysics, 2024 - Elsevier
We discuss the theoretical framework behind reconstruction of a generic class of inflationary
potentials for canonical single-field slow-roll inflation in a model-independent fashion. The …
potentials for canonical single-field slow-roll inflation in a model-independent fashion. The …
Investigating the Origin of CMB Large-Scale Features Using LiteBIRD and CMB-S4
Several missions following Planck are currently under development, which will provide high-
precision measurements of the Cosmic Microwave Background (CMB) anisotropies …
precision measurements of the Cosmic Microwave Background (CMB) anisotropies …
No-go Theorem for Cosmological Parity Violation
A Thavanesan - arXiv preprint arXiv:2501.06383, 2025 - arxiv.org
A no-go theorem for parity-violation in even $ D $-dimensional spacetimes invariant under $
ISO (d) $ and dilatations (as well as the implications for odd $ D $) is derived. For the case of …
ISO (d) $ and dilatations (as well as the implications for odd $ D $) is derived. For the case of …