98 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- L. N. Gumilyov Eurasian National UniversityKZ18 papers
- National Institute of Science Education and ResearchIN14 papers
- GLA UniversityIN11 papers
- Homi Bhabha National InstituteIN10 papers
- Indira Gandhi Mirpur UniversityIN10 papers
- Chinese Academy of SciencesCN8 papers
- University of DelhiIN8 papers
- Indian Institute of Technology JodhpurIN6 papers
- Delhi Technological UniversityIN5 papers
- Deen Dayal Upadhyaya Gorakhpur UniversityIN4 papers
- International Centre for Theoretical SciencesIN4 papers
- RWTH Aachen UniversityDE4 papers
69 papers
RRR fluctuations from non-singular bounce
Sayantan Choudhury
We present a consistent treatment of regularization, renormalization, and resummation in a framework involving a contracting phase, a non-singular bounce, and inflation with a shar…
Limits on the Inferred Hubble Constant Bias from a Local McVittie Gravitational Field
Daniele Gregoris
We examine the exact propagation of light in a McVittie spacetime to quantify the observational bias introduced on the inferred Hubble constant by a localized central mass em…
Testing a Sign-Switch Cosmological Model with Curvature through Latest Planck 2018, DESI DR2 and PantheonPlus\&SH0ES Observational Data
Archana Dixit, Manish Yadav, Anirudh Pradhan +1
We investigate the spatial geometry of the Universe within the framework of a sign-switch dark energy scenario by extending the recently proposed CDM model to include a…
Testing Exponential Gravity with CMB, DESI-DR2, and Supernova Data
Saurabh Verma, Archana Dixit, Anirudh Pradhan +1
One of the most popular competitors to the CDM paradigm as an explanation for the late-time acceleration of the universe is the modification of general relativity (GR), with models…
Observational Constraints and Geometric Diagnostics of Barboza-Alcaniz and Logarithmic Dark Energy Parametrizations
Archana Dixit, Saurabh Verma, Anirudh Pradhan +1
This study investigates and compares two prominent two-dimensional dark energy (DE) parameterizations: Barboza-Alcaniz (BA) and Logarithmic forms by comparing them with a comprehen…
Dynamical Dark Energy Signatures from a New Transition Parametrization in Flat FLRW Cosmology
Manish Yadav, Archana Dixit, Anirudh Pradhan +1
We investigate a cosmic scenario using a new transition parameterization of the diagnostic, , in the spatially flat Friedmann Lemaître Robertso…
Dynamical Oscillations in Dark Energy: Joint Constraints on the CDM Model from DESI, OHD, and Supernova Samples
Manish Yadav, Archana Dixit, M. S. Barak +1
In this study, we investigate the oscillatory dark energy model based on the DESI BAO data together with OHD, Pantheon Plus, and SH0ES measurements. We exami…
Constraints on Spatial Curvature and Dark Energy Dynamics in the CDM Model from DESI DR1 and DR2
Manish Yadav, Archana Dixit, M. S. Barak +1
In this study, we investigate the CDM dynamical dark energy model with spatial curvature utilizing the recently released DESI Collaboration data (DR1 and DR2) in conjunction wit…
Beyond CDM: Exploring a Dynamical Cosmological Constant Framework Consistent with Late-Time Observations
Archana Dixit, Manish Yadav, Anirudh Pradhan +1
In this work, we investigate a cosmological scenario with a time-dependent cosmological constant (t) within the spatially flat Friedmann-Lemaître-Robertson-Walker (FLRW) framewo…
Investigating the CDM Model with Latest DESI BAO Observations
Manisg Yadav, Archana Dixit, M. S. Barak +1
In this study, we explore the impact of various combinations of CMB-independent datasets, including the recent DESI BAO measurements, on the equation of state (EoS) of dark energy…
Empirical Validation: Investigating the CDM Model with new DESI BAO Observations
Manish Yadav, Archana Dixit, Anirudh Pradhan +1
The CDM model has long served as the cornerstone of modern cosmology, offering an elegant and successful framework for interpreting a wide range of cosmological observations. Ho…
Generalized Lemaître time for rotating and charged black holes and its near-horizon properties
A. V. Toporensky, O. B. Zaslavskii
We consider the behavior of the analogue of the Lemaitre time when a particle approaches the horizon of a rotating black hole. For the Kerr metric, the aforementioned time coincide…
Testing Gravity with Cosmological Observations: Confronting the Hubble Tension and Implications for the Late-Time Universe
Saurabh Verma, Archana Dixit, Anirudh Pradhan +1
In recent years, modifications to General Relativity (GR) have been explored to address cosmological observations, particularly in the context of late-time cosmic acceleration. Amo…
What new physics can we extract from inflation using the ACT DR6 and DESI DR2 Observations?
Sayantan Choudhury, Gulnur Bauyrzhan, Swapnil Kumar Singh +1
We present a comprehensive analysis of inflationary models in light of projected sensitivities from forthcoming CMB and gravitational wave experiments, incorporating data from rece…
Unconventional Searches for Exotic Particles at Future Lepton Colliders
Nilanjana Kumar
The main aim of the the Large Hadron Collider (LHC) experiments is to search for exotic particles with masses in the TeV range as predicted by Beyond Standard Model (BSM) theories.…
Probing Dark Energy Properties in Gravity with FLRW Cosmological Models
N. Myrzakulov, Anirudh Pradhan, A. Dixit +1
This study delves into the cosmological implications of the modified gravity framework within the context of the FLRW spacetime which offers a dynamic alternative to the s…
Negative non-Gaussianity as a salvager for PBHs with PTAs in bounce
Sayantan Choudhury, Kritartha Dey, Siddhant Ganguly +3
Non-Gaussianity in the primordial curvature perturbation is a crucial element of the early universe due to its significant impact on the primordial black hole (PBH) production. In…
Obviating PBH overproduction for SIGWs generated by Pulsar Timing Arrays in loop corrected EFT of bounce
Sayantan Choudhury, Siddhant Ganguly, Sudhakar Panda +2
In order to unravel the present situation of the PBH overproduction problem, our study emphasizes the critical role played by the equation of state (EoS) parameter within the f…
Inflationary Dynamics in Einstein-Gauss-Bonnet Gravity Using New Slow-Roll Approximations considering Generalised Reheating
Yogesh, Imtiyaz Ahmad Bhat, Mayukh R. Gangopadhyay
The Cosmic Microwave Background (CMB) observations results reported by {\it Planck} satellite suggest a plateau characteristic in the flat potential of the inflaton field is favore…
Large fluctuations and Primordial Black Holes
Sayantan Choudhury, M. Sami
In this paper, we review in detail different mechanisms of generation of large primordial fluctuations and their implications for the production of primordial black holes (PBHs) an…
Investigating Optical Variability of the Blazar S5 0716+714 On Diverse Time-scales
Ergün Ege, Aykut Özdönmez, Aditi Agarwal +1
We present the results of the observational study of the blazar S5 0716+716 in the optical bands B, V, R, and I between March 2019 and August 2023 to investigate its variability on…
Regularized-Renormalized-Resummed loop corrected power spectrum of non-singular bounce with Primordial Black Hole formation
Sayantan Choudhury, Ahaskar Karde, Sudhakar Panda +1
We present a complete and consistent exposition of the regularization, renormalization, and resummation procedures in the setup of having a contraction and then non-singular bounce…
Primordial Black Holes from Effective Field Theory of Stochastic Single Field Inflation at NNNLO
Sayantan Choudhury, Ahaskar Karde, Pankaj Padiyar +1
We present a study of the Effective Field Theory (EFT) generalization of stochastic inflation in a model-independent single-field framework and its impact on primordial black hole…
Large fluctuations in the Sky
Sayantan Choudhury
Renormalization of quantum loop effects generated from large fluctuations is a hugely debatable topic of research these days which rules out the Primordial Black Hole (PBH) formati…