14 citations · 44 across the 12 of their papers we have counts for
12 papers
Primordial Black Holes: A Review of Formation and Evolution
S. Shankaranarayanan, Soumya Bhattacharya, Archit Vidyarthi
Primordial Black Holes (PBHs) have emerged as a leading non-particulate candidate for dark matter and a unique cosmological probe, a paradigm shift accelerated by the detection of…
Phantom Menace in general Palatini theories
Rahul Thakur, Abhijith Ajith, Sukanta Panda +1
We study general theories in Palatini formalism and attempt to constrain the behavior of ones that could support both inflationary and late-time expansion era in a unified…
Eff-ACT-ive Starobinsky pre-inflation
Abhijith Ajith, Hardik Jitendra Kuralkar, Sukanta Panda +1
We consider quantum corrections to a recently obtained perturbative form of Starobinsky model to extract information about the initial conditions of the universe leading to cosmolo…
Testing the Starobinsky model of inflation with resonant cavities
Subhendra Mohanty, Sukanta Panda, Archit Vidyarthi
We show that the Starobinsky inflation model based on gravity has a special feature that it provides a unique scalaron-two-graviton vertex with a coupling proportional to $1/…
Observable Primordial Gravitational Waves from Non-minimally Coupled Palatini Modified Gravity
Hardik Jitendra Kuralkar, Sukanta Panda, Archit Vidyarthi
We probe the spectrum of primordial gravitational waves (GWs) produced during the eras of hyperkination, kination, and reheating in a non-minimally coupled, $\mathcal{L} \propto (1…
Quantizable Ghost-ridden theories using Kinetic Positivity Constraints
Sukanta Panda, Archit Vidyarthi
We present a novel way to constrain the ghost field with respect to other physical fields present in a given theory such that the theory becomes quantizable. This is achieved by im…
Self-healing unitarity is an optical illusion
Archit Vidyarthi
Among the vast variety of proposals put forward by the community to resolve tree-level unitarity violations in Higgs inflation models, there exists the concept of self-healing. It…
Ghost Free Theory in Unitary Gauge: A New Candidate
Pawan Joshi, Sukanta Panda, Archit Vidyarthi
We propose an algebraic analysis using a 3+1 decomposition to identify conditions for a clever cancellation of the higher derivatives, which plagued the theory with Ostrogradsky gh…
Local momentum space: Scalar field and gravity
Sukanta Panda, Abbas Altafhussain Tinwala, Archit Vidyarthi
We use the local momentum space technique to obtain an expansion of the Feynman propagators for scalar field and graviton up to first order in the background curvature. The express…
Ultraviolet Unitarity Violations in Non-minimally Coupled Scalar-Starobinsky Inflation
Sukanta Panda, Abbas Altafhussain Tinwala, Archit Vidyarthi
We perform the calculation for tree-level ultraviolet unitarity violation scales for scalar- inflation models by including an additional -type term. Due to certain…
Covariant Effective Action for Generalized Proca Theories
Sukanta Panda, Abbas Tinwala, Archit Vidyarthi
We investigate quantum stability of the generalised Proca theories in curved spacetime treating gravity as a dynamical field. To compute the quantum gravitational corrections we ev…
Covariant Effective Action for Scalar-Tensor Theories of Gravity
Sandeep Aashish, Sukanta Panda, Abbas Altafhussain Tinwala +1
We develop the calculation of the divergent part of one-loop covariant effective action for scalar fields minimally and non-minimally coupled to gravity using the generalized Schwi…