81 citations · 521 across the 33 of their papers we have counts for
33 papers
Beyond ΛCDM with the SKA Observatory -- II: Unveiling the Secrets of the Early Universe
José Fonseca, Benedict Bahr-Kalus, Mario Ballardini +12
The origins of the universe remain one of the biggest mysteries in modern cosmology. While the Planck satellite has provided a wealth of information about the early universe, there…
Impact of lensing magnification on the power spectrum turnover
Yolanda Dube, Roy Maartens, Bikash R. Dinda +2
The turnover scale of the matter power spectrum -- and consequently of the standard galaxy power spectrum monopole -- encodes a fundamental signature of matter-radiation equa…
No evidence for phantom crossing: local goodness-of-fit improvements do not persist under global Bayesian model comparison
Bikash R. Dinda, Roy Maartens, Shun Saito
Recent cosmological data have been interpreted as indicating deviations from CDM within the standard parametrization, including hints of phantom crossing and dynamical…
Calibration-independent consistency test of BAO and SNIa data: update
Bikash R. Dinda, Roy Maartens, Chris Clarkson
In a recent paper, arXiv:2509.19899, we presented a new method to test the consistency between uncalibrated BAO and SNIa data through a common parameter, the Alcock-Paczynski varia…
Turnover detection using the power spectrum and bispectrum
Yolanda Dube, Bikash R. Dinda, Sheean Jolicoeur +1
The turnover at the peak of the Fourier matter power spectrum encodes a fundamental signature of matter-radiation equality in the early Universe. This delivers a potential standard…
Calibration-independent consistency test of DESI DR2 BAO and SNIa
Bikash R. Dinda, Roy Maartens, Chris Clarkson
We investigate the consistency between DESI DR2 BAO and three SNIa datasets, Pantheon+, Union3, and DES-Y5. Our consistency test is {calibration}-independent since it is independen…
Phantom crossing or dark interaction?
Sêcloka L. Guedezounme, Bikash R. Dinda, Roy Maartens
Recent results from DESI BAO measurements, together with Planck CMB and Pantheon+ data, suggest that there may be a `phantom' phase () in the expansion of the Univer…
Physical vs phantom dark energy after DESI: thawing quintessence in a curved background
Bikash R. Dinda, Roy Maartens
Recent data from DESI, in combination with other data, provide moderate evidence of dynamical dark energy, . In the parametrization of , there is a preferenc…
Improved null tests of CDM and FLRW in light of DESI DR2
Bikash R. Dinda, Roy Maartens, Shun Saito +1
The DESI DR2 BAO data, in combination with CMB and different SNIa datasets, exclude the flat CDM model at more than 2.5 when analyzed through the CDM parametrization…
Model-agnostic assessment of dark energy after DESI DR1 BAO
Bikash R. Dinda, Roy Maartens
Baryon acoustic oscillation measurements by the Dark Energy Spectroscopic Instrument (Data Release 1) have revealed exciting results that show evidence for dynamical dark energy at…
A new diagnostic for the null test of dynamical dark energy in light of DESI 2024 and other BAO data
Bikash R. Dinda
We introduce a new diagnostic for the null tests of dynamical dark energy alongside two other combined equivalent diagnostics. These diagnostics are useful, especially when we incl…
A comprehensive data-driven odyssey to explore the equation of state of dark energy
Bikash R. Dinda, Narayan Banerjee
For the first time, we reconstruct the dark energy equation of the state parameter from the combination of background and perturbation observations, specifically combining the…
Cosmic curvature on large-scale structures with homogeneous dark energy
Bikash R. Dinda
This study explores the impact of cosmic curvature on structure formation through general relativistic first-order perturbation theory. We analyze continuity and Euler equations, i…
Analytical Gaussian Process Cosmography: Unveiling Insights into Matter-Energy Density Parameter at Present
Bikash R. Dinda
In this study, we introduce a novel analytical Gaussian Process (GP) cosmography methodology, leveraging the differentiable properties of GPs to derive key cosmological quantities…
Constraints on the speed of sound in the k-essence model of dark energy
Bikash R. Dinda, Narayan Banerjee
We consider a particular k-essence scalar field model for the late-time cosmic acceleration in which the sound speed, parametrized as is constant. We compute the relevant bac…
21 cm Power Spectrum for Bimetric Gravity and its Detectability with SKA1-Mid Telescope
Ajay Bassi, Bikash R. Dinda, Anjan A. Sen
We consider a modified gravity theory through a special kind of ghost-free bimetric gravity, where one massive spin-2 field interacts with a massless spin-2 field. In this bimetric…
Constraints on cosmic curvature from cosmic chronometer and quasar observations
Bikash R. Dinda, Haveesh Singirikonda, Subhabrata Majumdar
We consider cosmic chronometer (CC) data for the Hubble parameter, quasar (QSO) luminosities data of X-rays and ultraviolet rays emission, and the latest measurements of the presen…
Minimal model dependent constraints on cosmological nuisance parameters and cosmic curvature from combinations of cosmological data
Bikash R. Dinda
The study of cosmic expansion history and the late time cosmic acceleration from observational data depends on the nuisance parameters associated with the data. For example, the ab…
21 cm power spectrum in interacting cubic Galileon model
Bikash R. Dinda, Md. Wali Hossain, Anjan A. Sen
We show the detectability of interacting and non-interacting cubic Galileon models from the CDM model through the 21 cm power spectrum. We show that the interferometric observat…
Model independent bounds on Type Ia supernova absolute peak magnitude
Bikash R. Dinda, Narayan Banerjee
We put constraints on the peak absolute magnitude, of type Ia supernova using the Pantheon sample for type Ia supernova observations and the cosmic chronometers data for the…
Probing Compensated Isocurvature with the 21-cm Signal during Cosmic Dawn
Selim C. Hotinli, Thomas Binnie, Julian B. Muñoz +2
Upcoming measurements of the 21-cm line of neutral hydrogen will open a new observational window into the early stages of structure growth, providing a unique opportunity for probi…
Cosmic expansion parametrization: Implication for curvature and tension
Bikash R. Dinda
We propose an analytical parametrization of the comoving distance and Hubble parameter to study the cosmic expansion history beyond the vanilla CDM model. The parametrization is…
A study on Cubic Galileon Gravity Using N-body Simulations
Jiajun Zhang, Bikash R. Dinda, Md. Wali Hossain +2
We use N-body simulation to study the structure formation in the Cubic Galileon Gravity model where along with the usual kinetic and potential term we also have a higher derivative…
A model independent parametrization of the late time cosmic acceleration: constraints on the parameters from recent observations
Bikash R. Dinda
In this work, we have considered a model independent approach to study the nature of the late time cosmic acceleration. We have used the Pade approximation to parametrize the comov…