64 citations · 383 across the 17 of their papers we have counts for
13 papers · 1 filter
One-loop infrared rescattering by enhanced scalar fluctuations during inflation
Jacopo Fumagalli, Sukannya Bhattacharya, Marco Peloso +2
We show that, whenever the perturbations of some field are excited during inflation by a physical process on sub-horizon scales, they unavoidably generate, even through gravitation…
Primordial Black Hole Formation in Non-Standard Post-Inflationary Epochs
Sukannya Bhattacharya
When large overdensities gravitationally collapse in the early universe, they lead to primordial black holes (PBH). Depending on the exact model of inflation leading to necessary l…
Sharp turns in axion monodromy: primordial black holes and gravitational waves
Sukannya Bhattacharya, Ivonne Zavala
Large turns in multifield inflation can lead to a very rich phenomenology, but are difficult to realise in supergravity, and typically require large field space curvatures. In this…
The paradigm of warm quintessential inflation and spontaneous baryogenesis
Soumen Basak, Sukannya Bhattacharya, Mayukh R. Gangopadhyay +3
In this paper, we consider a scenario of spontaneous baryogenesis in a framework of warm quintessential inflation where the residual inflaton field, left out after warm inflation,…
Solar Mass Primordial Black Holes in Moduli Dominated Universe
Sukannya Bhattacharya, Anirban Das, Koushik Dutta
We explore the prospect of producing primordial black holes around the solar mass region during an early matter domination epoch. The early matter-dominated epoch can arise when a…
Non-thermal Hot Dark Matter from Inflaton/Moduli Decay: The Momentum Distribution and Relaxing the Cosmological Mass Bound
Sukannya Bhattacharya, Subinoy Das, Koushik Dutta +3
Decay of the inflaton or moduli which dominated the energy density of the universe at early times leads to a matter to radiation transition epoch. We consider non-thermal sterile d…
Implications of the NANOGrav result on primordial gravitational waves in nonstandard cosmologies
Sukannya Bhattacharya, Subhendra Mohanty, Priyank Parashari
Recently, the NANOGrav collaboration has reported evidence for a common-spectrum stochastic process, which might be interpreted as the first ever detection of stochastic gravitatio…
Fibre inflation and precision CMB data
Sukannya Bhattacharya, Koushik Dutta, Mayukh Raj Gangopadhyay +2
Generic features of models of inflation obtained from string compactifications are the correlations between the model parameters and the postinflationary evolution of the universe.…
Primordial black holes and gravitational waves in nonstandard cosmologies
Sukannya Bhattacharya, Subhendra Mohanty, Priyank Parashari
For primordial black holes (PBHs) to form a considerable fraction of cold dark matter, the required amplitude of primordial scalar perturbations is quite large ($P_ζ(k) \sim 10^{-2…
Probing the era of reheating for reconstructed inflationary potential in the RS II braneworld
Sukannya Bhattacharya, Kumar Das, Mayukh R. Gangopadhyay
We analyse the epoch of reheating after an inflationary phase in the Randal Sundrum(RS) Type- braneworld, where we did not consider any particular model of inflation, but r…
Study in the noncanonical domain of Goldstone inflation
Sukannya Bhattacharya, Mayukh R. Gangopadhyay
Recent observations of the cosmic microwave background (CMB) indicate that a successful theory of cosmological inflation needs to have flat potential of the inflaton scalar field.…
Confronting Kähler moduli inflation with CMB data
Sukannya Bhattacharya, Koushik Dutta, Mayukh R. Gangopadhyay +1
In models of inflation obtained from string compactification, moduli vacuum misalignment leads to an epoch in the post-inflationary history of the universe when the energy density…
Constraining Warm Inflation with CMB data
Mar Bastero-Gil, Sukannya Bhattacharya, Koushik Dutta +1
We confront the warm inflation observational predictions directly with the latest CMB data. We focus on a linear temperature (T) dissipative coefficient combined with the simplest…