6 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…
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/…
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 unifie…
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…
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…