Publications (69)
Effects of type Ia supernovae absolute magnitude priors on the Hubble constant value
Yun Chen, Suresh Kumar, Bharat Ratra +1
We systematically explore the influence of the prior of the peak absolute magnitude () of type Ia supernovae (SNe Ia) on the measurement of the Hubble constant () from SNe…
Mapping the CDM scenario to modified gravity: Effects on structure growth rate
Mateus S. Souza, Ana M. Barcelos, Rafael C. Nunes +2
The concept of a rapidly sign-switching cosmological constant, interpreted as a mirror AdS-dS transition in the late universe and known as the CDM, has significantly im…
Measurements of and reconstruction of the dark energy properties from a model-independent joint analysis
Alexander Bonilla, Suresh Kumar, Rafael C. Nunes
Gaussian processes (GP) provide an elegant and model-independent method for extracting cosmological information from the observational data. In this work, we employ GP to perform a…
A CsI(Tl) detector array for the measurement of light charged particles in heavy-ion reactions
P. C. Rout, V. M. Datar, D. R. Chakrabarty +5
An array of eight CsI(Tl) detectors has been set up to measure the light charged particles in nuclear reactions using heavy ions from the Pelletron Linac Facility, Mumbai. The ener…
-CDM: A promising phenomenological extension of the standard model of cosmology
Suresh Kumar
We investigate a phenomenological extension of the standard CDM framework, the -CDM model, in which the total energy density of the universe is expanded in powers…
Anisotropic model of dark energy dominated universe with hybrid expansion law
Suresh Kumar
The paper deals with the study of the dynamics of Universe within the framework of a spatially homogeneous Bianchi-V space-time filled with a perfect fluid composed of non-interact…
Electromagnetic transition from the 4 to 2 resonance in Be measured via the radiative capture in He+He
V. M. Datar, D. R. Chakrabarty, Suresh Kumar +15
An earlier measurement on the 4 to 2 radiative transition in Be provided the first electromagnetic signature of its dumbbell-like shape. However, the large uncertainty…
String Cosmology in Anisotropic Bianchi-II Space-time
Suresh Kumar
The present study deals with a spatially homogeneous and anisotropic Bianchi-II cosmological model representing massive strings. The energy-momentum tensor, as formulated by Leteli…
Cosmology Intertwined II: The Hubble Constant Tension
Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +90
The current cosmological probes have provided a fantastic confirmation of the standard Cold Dark Matter cosmological model, that has been constrained with unprecedented accura…
Relaxing cosmological tensions with a sign switching cosmological constant: Improved results with Planck, BAO, and Pantheon data
Ozgur Akarsu, Suresh Kumar, Emre Ozulker +2
We present a further observational analysis of the CDM model proposed in Akarsu et al. [Phys. Rev. D 104, 123512 (2021)]. This model is based on the recent conjecture s…
Testing the warmness of dark matter
Suresh Kumar, Rafael C. Nunes, Santosh Kumar Yadav
Dark matter (DM) as a pressureless perfect fluid provides a good fit of the standard CDM model to the astrophysical and cosmological data. In this paper, we investigate two ext…
Observational constraints on variable equation of state parameters of dark matter and dark energy after Planck
Suresh Kumar, Lixin Xu
In this paper, we study a cosmological model in general relativity within the framework of spatially flat Friedmann-Robertson-Walker space-time filled with ordinary matter (baryoni…
Remedy of some cosmological tensions via effective phantom-like behavior of interacting vacuum energy
Suresh Kumar
Since physics of the dark sector components of the Universe is not yet well-understood, the phenomenological studies of non-minimal interaction in the dark sector could possibly pa…
Probing the interaction between dark matter and dark energy in the presence of massive neutrinos
Suresh Kumar, Rafael C. Nunes
We consider the possibility of an interaction in the dark sector in the presence of massive neutrinos, and study the observational constraints on three different scenarios of massi…
Testing spatial curvature and anisotropic expansion on top of the CDM model
Ozgur Akarsu, Eleonora Di Valentino, Suresh Kumar +2
We explore the possible advantages of extending the CDM model by more realistic backgrounds compared to its spatially flat RW spacetime assumption, while preserving the underpi…
Minimal theory of massive gravity in the light of CMB data and the tension
Jose C. N. de Araujo, Antonio De Felice, Suresh Kumar +1
We investigate the Minimal Theory of Massive Gravity (MTMG) in the light of different observational data sets which are in tension within the CDM cosmology. In particular, we a…
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.…
New tests of dark sector interactions from the full-shape galaxy power spectrum
Rafael C Nunes, Sunny Vagnozzi, Suresh Kumar +2
We explore the role of redshift-space galaxy clustering data in constraining non-gravitational interactions between dark energy (DE) and dark matter (DM), for which state-of-the-ar…
Cosmology Intertwined I: Perspectives for the Next Decade
Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +89
The standard Cold Dark Matter cosmological model provides an amazing description of a wide range of astrophysical and astronomical data. However, there are a few big open ques…
Measurement of the response of a liquid scintillation detector to monoenergetic electrons and neutrons
P. C. Rout, A. Gandhi, T. Basak +11
The response of the liquid scintillator (EJ-301 equivalent to NE-213) to the monoenergetic electrons produced in Compton scattered -ray tagging has been carried out for various…
New cosmological constraints on gravity in light of full Planck-CMB and type Ia supernovae data
Suresh Kumar, Rafael C. Nunes, Priya Yadav
We investigate two new observational perspectives in the context of torsional gravitational modification of general relativity, i.e., the gravity: i) We use Pantheon data of…
Probing kinematics and fate of the Universe with linearly time-varying deceleration parameter
Ozgur Akarsu, Tekin Dereli, Suresh Kumar +1
The parametrizations and (Chevallier-Polarski-Linder parametrization) of deceleration parameter, which are linear in cosmic redshift and sca…
Probing late-time deviations from CDM with a quadratic dark energy expansion
Sehjal Khandelwal, Abraão J. S. Capistrano, Suresh Kumar +1
We investigate the observational viability of a quadratic dark energy expansion (QDEE) model as a phenomenological extension of the standard cosmological framework…
Quantifying the tension and evidence for interacting dark energy from redshift-space distortion measurements
Miguel A. Sabogal, Emanuelly Silva, Rafael C. Nunes +3
In recent years, Cosmic Microwave Background (CMB) observations, Weak Lensing surveys, and measurements from Redshift-Space Distortions (RSD) have revealed a significant…
Software Estimations Risk in Pakistan Software Industry
Suresh Kumar, Qaisar Imtiaz, Sarmad Mahar
Software and IT industry in Pakistan have seen a dramatic growth and success in past few years and is expected to get doubled by 2020, according to a research. Software development…
OLGA : An Ontology and LSTM-based approach for generating Arithmetic Word Problems (AWPs) of transfer type
Suresh Kumar, P Sreenivasa Kumar
Machine generation of Arithmetic Word Problems (AWPs) is challenging as they express quantities and mathematical relationships and need to be consistent. ML-solvers require a large…
Consistency of the nonflat CDM model with the new result from BOSS
Suresh Kumar
Using 137,562 quasars in the redshift range from the Data Release 11 (DR11) of the Baryon Oscillation Spectroscopic Survey (BOSS) of Sloan Digital Sky Survey (SD…
Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
Elcio Abdalla, Guillermo Franco Abellán, Amin Aboubrahim +200
In this paper we will list a few important goals that need to be addressed in the next decade, also taking into account the current discordances between the different cosmological…
Cosmological implications of scale-independent energy-momentum squared gravity: Pseudo nonminimal interactions in dark matter and relativistic relics
Ozgur Akarsu, Nihan Katirci, Suresh Kumar +2
In this paper, we introduce a scale-independent energy-momentum squared gravity (EMSG) that allows different gravitational couplings for different types of sources, which may lead…
Sign Switching in Dark Sector Coupling Interactions as a Candidate for Resolving Cosmological Tensions
Miguel A. Sabogal, Emanuelly Silva, Rafael C. Nunes +2
The CDM model has successfully explained a wide range of cosmological observations, but is increasingly challenged by the emergence of cosmological tensions, particularly the H…
Deep Learning in Computational Biology: Advancements, Challenges, and Future Outlook
Suresh Kumar, Dhanyashri Guruparan, Pavithren Aaron +4
Deep learning has become a powerful tool in computational biology, revolutionising the analysis and interpretation of biological data over time. In our article review, we delve int…
Dark sector interaction: a remedy of the tensions between CMB and LSS data
Suresh Kumar, Rafael C. Nunes, Santosh Kumar Yadav
The well-known tensions on the cosmological parameters and within the CDM cosmology shown by the Planck-CMB and LSS data are possibly due to the systematics in the…
Probing the matter and dark energy sources in a viable Big Rip model of the Universe
Suresh Kumar
Chevallier-Polarski-Linder (CPL) parametrization for the equation of state of dark energy in terms of cosmic redshift or scale factor have been frequently studied in the literature…
CDM model: A promising scenario for alleviation of cosmological tensions
Ozgur Akarsu, Eleonora Di Valentino, Suresh Kumar +3
We present a comprehensive analysis of the CDM model, which explores the recent conjecture suggesting a rapid transition of the Universe from anti-de Sitter vacua to de…
Cosmology with hybrid expansion law: scalar field reconstruction of cosmic history and observational constraints
Ozgur Akarsu, Suresh Kumar, R. Myrzakulov +2
In this paper, we consider a simple form of expansion history of Universe referred to as the hybrid expansion law - a product of power-law and exponential type of functions. The an…
Complex fragment emission in low energy light-ion reactions
S. Kundu, C. Bhattacharya, K. Banerjee +20
Inclusive energy spectra of the complex fragments (3 Z 5) emitted in the reactions C (77 MeV)+ Si, B (64 MeV)+ Si and C (73 MeV)+ $…
Cosmological constraints on CDM scenario in a type II minimally modified gravity
Ãzgür Akarsu, Antonio De Felice, Eleonora Di Valentino +5
The idea of a rapid sign-switching cosmological constant (mirror AdS-dS transition) in the late universe at , known as the CDM model, has significantly improv…
Probing Dynamical Dark Energy with Late-Time Data: Evidence, Tensions, and the Limits of the CDM Framework
Tengpeng Xu, Suresh Kumar, Yun Chen +2
We test the dynamical dark-energy CDM (CPL) framework against CDM using CMB anisotropies and lensing together with DESI DR2, SDSS-IV, transverse/angular BAO (BAOtr), an…
Cosmological bounds on dark matter-photon coupling
Suresh Kumar, Rafael C. Nunes, Santosh Kumar Yadav
We investigate an extension of the CDM model where the dark matter (DM) is coupled to photons, inducing a nonconservation of the numbers of particles for both species, where th…
New constraints on interacting dark energy from DESI DR2 BAO observations
Emanuelly Silva, Miguel A. Sabogal, Mateus Scherer +3
In its second data release (DR2), the Dark Energy Spectroscopic Instrument (DESI) publicly released measurements of Baryon Acoustic Oscillations (BAO) from over 13.1 million galaxi…
Some Bianchi Type-V Models of Accelerating Universe with Dark Energy
Suresh Kumar, Anil Kumar Yadav
The paper deals with a spatially homogeneous and anisotropic universe filled with perfect fluid and dark energy components. The two sources are assumed to interact minimally togeth…
Exploring the tension and the evidence of dark sector interaction from 2D BAO measurements
Armando Bernui, Eleonora Di Valentino, William Giarè +2
We explore observational constraints on a cosmological model with an interaction between dark energy (DE) and dark matter (DM), using a compilation of 15 measurements of the 2D BAO…
Relaxing cosmological tensions with a sign switching cosmological constant
Ozgur Akarsu, Suresh Kumar, Emre Ozulker +1
Inspired by the recent conjecture originated from graduated dark energy that the Universe has recently transitioned from anti-de Sitter vacua to de Sitter vacua, we extend the …
Updating non-standard neutrinos properties with Planck-CMB data and full-shape analysis of BOSS and eBOSS galaxies
Suresh Kumar, Rafael C. Nunes, Priya Yadav
Using the latest observational data from Planck-CMB and its combination with the pre-reconstructed full-shape (FS) galaxy power spectrum measurements from the BOSS DR12 sample and…
Observational constraints on Hubble constant and deceleration parameter in power-law cosmology
Suresh Kumar
In this paper, we show that the expansion history of the Universe in power-law cosmology essentially depends on two crucial parameters, namely the Hubble constant and decel…
Constraints on a Bianchi type I spacetime extension of the standard CDM model
Ozgur Akarsu, Suresh Kumar, Shivani Sharma +1
We consider the simplest anisotropic generalization, as a correction, to the standard CDM model, by replacing the spatially flat Robertson-Walker metric by the Bianchi type-I m…
Some FRW Models of Accelerating Universe with Dark Energy
Suresh Kumar
The paper deals with a spatially homogeneous and isotropic FRW space-time filled with perfect fluid and dark energy components. The two sources are assumed to interact minimally, a…
Artificial Intelligence-Driven Prognostic Classification of COVID-19 Using Chest X-rays: A Deep Learning Approach
Alfred Simbun, Suresh Kumar
Background: The COVID-19 pandemic has overwhelmed healthcare systems, emphasizing the need for AI-driven tools to assist in rapid and accurate patient prognosis. Chest X-ray imagin…
CDM cosmology from a type-II minimally modified gravity
Ãzgür Akarsu, Antonio De Felice, Eleonora Di Valentino +5
We integrate CDM, a promising scenario for alleviating cosmological tensions, into VCDM, a type-II minimally modified gravity. This promotes the scenario to a fully pre…
Comparison between the Logotropic and CDM models at the cosmological scale
Pierre-Henri Chavanis, Suresh Kumar
We perform a detailed comparison between the Logotropic model [P.H. Chavanis, Eur. Phys. J. Plus 130 (2015) 130] and the CDM model. These two models behave similarly at large (…
Determining the Hubble constant from Hubble parameter measurements
Yun Chen, Suresh Kumar, Bharat Ratra
We use 28 Hubble parameter, , measurements at intermediate redshifts to determine the present-day Hubble constant in four cosmological models. We…
CDM cosmology: Alleviating major cosmological tensions by predicting standard neutrino properties
Anita Yadav, Suresh Kumar, Cihad Kibris +1
We investigate a two-parameter extension of the CDM model by allowing variations in the effective number of neutrino species and their total mass $\sum m_…
Direct observation of 4+ to 2+ gamma transition in 8Be
V. M. Datar, Suresh Kumar, D. R. Chakrabarty +4
The low lying states in Be are believed to have a two-alpha cluster structure and hence a large intrinsic quadrupole deformation. An earlier calculation showed a large collecti…
Observational constraints on dark matter-dark energy scattering cross section
Suresh Kumar, Rafael C. Nunes
In this letter, we report precise and robust observational constraints on dark matter-dark energy scattering cross section, using the latest data from cosmic microwave background (…
Study of transfer reaction channel in C + Al system
Aparajita Dey, M. Biswas, C. Bhattacharya +20
The 1p transfer channel in the Al(C, B)Si reaction has been studied at E = 73, 81 and 85 MeV. The finite range distorted wave Born approximation…
Measurement of the damping of nuclear shell effect in the doubly magic Pb region
P. C. Rout, D. R. Chakrabarty, V. M. Datar +6
The damping of the nuclear shell effect with excitation energy has been measured through an analysis of the neutron spectra following the triton transfer in the Li induced reac…
New late-time constraints on gravity
Suresh Kumar, Rafael C. Nunes, Supriya Pan +1
Modification of general relativity (GR) inspired by theories like gravity is among the most popular ones to explain the late-time acceleration of the Universe as an alternat…
Reconstruction of the dark sectors' interaction: A model-independent inference and forecast from GW standard sirens
Alexander Bonilla, Suresh Kumar, Rafael C. Nunes +1
Interacting dark matter (DM) - dark energy (DE) models have been intensively investigated in the literature for their ability to fit various data sets as well as to explain some ob…
Rastall gravity extension of the standard CDM model: theoretical features and observational constraints
Ozgur Akarsu, Nihan Katirci, Suresh Kumar +3
We present a detailed investigation of the Rastall gravity extension of the standard CDM model. We review the model for two simultaneous modifications of different nature in th…
Cosmology Intertwined IV: The Age of the Universe and its Curvature
Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +88
A precise measurement of the curvature of the Universe is of primeval importance for cosmology since it could not only confirm the paradigm of primordial inflation but also help in…
A large area plastic scintillator detector array for fast neutron measurements
P. C. Rout, D. R. Chakrabarty, V. M. Datar +5
A large area plastic scintillator detector array(~ 1 m x1m) has been set up for fast neutron spectroscopy at the BARC-TIFR Pelletron laboratory, Mumbai. The energy, time and positi…
Echo of interactions in the dark sector
Suresh Kumar, Rafael C. Nunes
We investigate the observational constraints on an interacting vacuum energy scenario with two different neutrino schemes (with and without a sterile neutrino) using the most recen…
Cosmic acceleration in dust only Universe via energy-momentum powered gravity
Ozgur Akarsu, Nihan Katirci, Suresh Kumar
We propose a modified theory of gravitation constructed by the addition of the term to the Einstein-Hilbert action, and elaborate a particular case $f(T_{μν…
Cosmology Intertwined III: and
Eleonora Di Valentino, Luis A. Anchordoqui, Ozgur Akarsu +89
The standard Cold Dark Matter cosmological model provides a wonderful fit to current cosmological data, but a few tensions and anomalies became statistically significant with…
Characterization of PARIS LaBr(Ce)-NaI(Tl) phoswich detectors upto 22 MeV
C. Ghosh, V. Nanal, R. G. Pillay +16
In order to understand the performance of the PARIS (Photon Array for the studies with Radioactive Ion and Stable beams) detector, detailed characterization of two individual phosw…
Bianchi type II models in the presence of perfect fluid and anisotropic dark energy
Suresh Kumar, Ozgur Akarsu
Spatially homogeneous but totally anisotropic and non-flat Bianchi type II cosmological model has been studied in general relativity in the presence of two minimally interacting fl…
Observational bounds on extended minimal theories of massive gravity: New limits on the graviton mass
Antonio De Felice, Suresh Kumar, Shinji Mukohyama +1
In this work, we derive for the first time observational constraints on the extended Minimal Theory of Massive Gravity (eMTMG) framework in light of Planck-CMB data, geometrical me…
Statistical consistency of sign-switching vacuum energy with cosmological observations
Sehjal Khandelwal, Abraão J. S. Capistrano, Suresh Kumar
We assess dataset agreement and late-time predictive adequacy in CDM and its sign-switching extension, CDM, using a suite of Gaussian and exact non-Gaussian consist…
Report of the Topical Group on Cosmic Probes of Fundamental Physics for for Snowmass 2021
Rana X. Adhikari, Luis A. Anchordoqui, Ke Fang +118
Cosmic Probes of Fundamental Physics take two primary forms: Very high energy particles (cosmic rays, neutrinos, and gamma rays) and gravitational waves. Already today, these probe…