299 citations · 341 across the 12 of their papers we have counts for
12 papers
Extended Universal Rotational Curve of Spiral Galaxies
Esha Bhatia, Paolo Salucci, Tiziano Schiavone +1
In this work, we aim to advance the Universal Rotation Curve (URC) paradigm by leveraging new data and extending its observational domain. Building on previous studies that establi…
Dynamical Dark Energy or Modified Gravity? Signatures in Gravitational Wave Propagation
Purnendu Karmakar, Sandeep Haridasu
We discuss the implications of the most recent DESI Baryon Acoustic Oscillations (BAO) DR2 and DESyr5 compilation of supernovae (SNe) datasets for modified gravity focusing on non-…
Constraints on Logarithmic Model Extensions of Symmetric Teleparallel Gravity
Purnendu Karmakar, Sandeep Haridasu, Atsushi Nishizawa
We address various cosmological phenomenologies in the symmetric teleparallel framework both in background and perturbation such as cosmic expansion, gravitational coupling constan…
Outer regions of galaxy clusters as a new probe to test modifications to gravity
Minahil Adil Butt, Sandeep Haridasu, Antonaldo Diaferio +4
We apply the caustic technique to samples of galaxy clusters stacked in redshift space to estimate the gravitational potential in the cluster's outer region and test modifications…
Constraints on Generalized Gravity-Thermodynamic Cosmology from DESI DR2
Udit K. Tyagi, Sandeep Haridasu, Soumen Basak
We explore the cosmological implications of generalized entropic models within the framework of Gravity-Thermodynamics (GT) approaches. These models, characterized by three or four…
Unveiling the Coma Cluster Structure: From the Core to the Hubble Flow
David Benisty, Jenny Wagner, Sandeep Haridasu +1
The Coma cluster, embedded in a cosmic filament, is a complex and dynamically active structure in the local Universe. Applying a density-based member selection dbscan to data from…
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.…
Modified gravity in galaxy clusters: Joint analysis of Hydrostatics and Caustics
Minahil Adil Butt, Sandeep Haridasu, Yacer Boumechta +4
We present a comprehensive joint analysis of two distinct methodologies for measuring the mass of galaxy clusters: hydrostatic measurements and caustic techniques. We show that by…
The shape of the Chameleon fifth-force on the mass components of galaxy clusters
Lorenzo Pizzuti, Valentina Amatori, Alexandre M. Pombo +1
In the context of Chameleon gravity, we present a semi-analytical solution of the chameleon field profile in accurately modelled galaxy cluster's mass components, namely: the stell…
Inferring dark energy properties from the scale factor parametrisation
Upala Mukhopadhyay, Sandeep Haridasu, Anjan A Sen +1
We propose and implement a novel test to assess deviations from well-established concordance CDM cosmology while inferring dark energy properties. In contrast to the commonly im…
Mass Modeling and Kinematics of Galaxy Clusters in Modified Gravity
Lorenzo Pizzuti, Yacer Boumechta, Sandeep Haridasu +6
The chameleon screening mechanism has been constrained many a time using dynamic and kinematic galaxy cluster observables. Current constraints are, however, insensitive to differen…
Holographic and Gravity-Thermodynamic Approaches in Entropic Cosmology: Bayesian Assessment using late-time Data
Udit K. Tyagi, Sandeep Haridasu, Soumen Basak
We investigate the cosmological implications of entropy-based approaches in the context of Holographic Dark Energy (HDE) and Gravity-Thermodynamics (GT) formalisms. We utilise the…