299 citations · 673 across the 15 of their papers we have counts for
15 papers
Model-Independent Indication for a Localized Anomaly in the Late-Time Expansion History
Shibendu Gupta Choudhury, Purba Mukherjee, Eleonora Di Valentino +1
We investigate the late-time expansion history of the Universe using a model-independent spline reconstruction of cosmological distances based on the latest DESI DR2 baryon acousti…
Exploring the Impact of Systematic Bias in Type Ia Supernova Cosmology Across Diverse Dark Energy Parametrizations
Drishti Sharma, Purba Mukherjee, Anjan A Sen +1
We investigate the impact of instrumental and astrophysical systematics on dark energy (DE) constraints from Type Ia supernova (SN-Ia) observations. Using simulated datasets consis…
Anchoring the Universe with Characteristic Redshifts using Raychaudhuri Equation Informed Reconstruction Algorithm (REIRA)
Shibendu Gupta Choudhury, Purba Mukherjee, Anjan Ananda Sen
We study the robustness and physical implications of a set of characteristic redshifts that capture key features of the late-time Universe. Using both model-independent reconstruct…
Can an Anti-de Sitter Vacuum in the Dark Energy Sector Explain JWST High-Redshift Galaxy and Reionization Observations?
Anirban Chakraborty, Tirthankar Roy Choudhury, Anjan Ananda Sen +1
The unexpectedly large abundance of UV-bright galaxies at discovered by the James Webb Space Telescope poses a significant challenge to the standard CDM cosmology. This w…
New Expansion Rate Anomalies at Characteristic Redshifts Geometrically Determined using DESI-DR2 BAO and DES-SN5YR Observations
Purba Mukherjee, Anjan A Sen
We perform a model-independent reconstruction of the cosmic distances using the Multi-Task Gaussian Process (MTGP) framework as well as knot-based spline techniques with DESI-DR2 B…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
A New Tension at Characteristic Redshift from DESI-DR1 BAO and DES-SN5YR Observations
Purba Mukherjee, Anjan A Sen
We perform a model-independent reconstruction of the angular diameter distance () using the Multi-Task Gaussian Process (MTGP) framework with DESI-DR1 BAO and DES-SN5YR data…
Towards a Composite Framework for Simultaneous Exploration of New Physics in Background and Perturbed Universe
Shibendu Gupta Choudhury, Purba Mukherjee, Anjan Ananda Sen
We investigate deviations from CDM by independently parameterizing modifications in the background evolution and the growth of structures. The background is characterized by two…
Model-Agnostic Cosmological Inference with SDSS-IV eBOSS: Simultaneous Probing for Background and Perturbed Universe
Purba Mukherjee, Anjan A. Sen
Here we explore certain subtle features imprinted in data from the completed Sloan Digital Sky Survey IV (SDSS-IV) extended Baryon Oscillation Spectroscopic Survey (eBOSS) as a com…
Quintessential Implications of the presence of AdS in the Dark Energy sector
Purba Mukherjee, Dharmendra Kumar, Anjan A Sen
We explore the implications for an Anti-de Sitter (AdS) vacuum, equivalently a negative cosmological constant (nCC), in the dark energy (DE) sector using current cosmological obser…
Cosmology With Non-Minimally Coupled K-Field
A. A. Sen, N. Chandrachani Devi
We consider non-minimally coupled (with gravity) scalar field with non-canonical kinetic energy. The form of the kinetic term is of Dirac-Born-Infeld (DBI) form.We study the early…
Cosmological Scaling Solutions with Tachyon:Modified Gravity Model
A. A Sen, N. Chandrachani Devi
Modifying the Einstein's gravity at large distance scales is one of the interesting proposals to explain the late time acceleration of the universe. In this paper, we analyse scali…
Quintessence Model With Double Exponential Potential
A. A. Sen, S. Sethi
We have reinvestigated the quintessence model with minimally coupled scalar field in the context of recent Supernova observation at . By assuming the form of the scale facto…
Late time acceleration in Brans Dicke Cosmology
S. Sen, A. A. Sen
In this work we have investigated the possibility of having a late time accelerated phase of the universe, suggested by recent supernova observation, in the context of Brans Dicke…
Dissipative Fluid in Brans Dicke theory and late time acceleration
A. A. Sen, S. Sen, S. Sethi
We have investigated the possibility of having a late time accelerated expansion phase for the universe. We have used a dissipative fluid in Brans-Dicke(BD) theory for this purpose…