151 citations · 623 across the 20 of their papers we have counts for
20 papers
Examining the Linear and Quadratic Dark Energy Parameterizations with DESI DR2 via AIC and BIC Selection
Laiphangbam Khumaba Mangang, Yumnam Prakash Singh, N. Chandrachani Devi
We examine whether or not the current observational preference for a dynamical dark energy(DE), as reported by DESI, is an artifact of the chosen functional form of dark energy equ…
The DESI -body Simulation Project I: Testing the Robustness of Simulations for the DESI Dark Time Survey
Cameron Grove, Chia-Hsun Chuang, Ningombam Chandrachani Devi +19
Analysis of large galaxy surveys requires confidence in the robustness of numerical simulation methods. The simulations are used to construct mock galaxy catalogs to validate data…
Testing the theory of gravity with DESI: estimators, predictions and simulation requirements
Shadab Alam, Christian Arnold, Alejandro Aviles +33
Shortly after its discovery, General Relativity (GR) was applied to predict the behavior of our Universe on the largest scales, and later became the foundation of modern cosmology.…
Non-linear Structure Formation for Dark Energy Models with a Steep Equation of State
N. Chandrachani Devi, M. Jaber-Bravo, G. Aguilar-Argüello +3
We study the nonlinear regime of large scale structure formation considering a dynamical dark energy (DE) component determined by a Steep Equation of State parametrization (SEoS) $…
J-PAS: forecasts on interacting dark energy from baryon acoustic oscillations and redshift-space distortions
A. A. Costa, R. J. F. Marcondes, R. G. Landim +14
We estimate the constraining power of J-PAS for parameters of an interacting dark energy cosmology. The survey is expected to map several millions of luminous red galaxies, emissio…
The Galaxy Halo Connection in Modified Gravity Cosmologies: Environment Dependence of Galaxy Luminosity function
N. Chandrachani Devi, Aldo Rodríguez-Puebla, O. Valenzuela +3
We investigate the dependence of the galaxy-halo connection and galaxy density field in modified gravity models using the body simulations for and nDGP models at .…
The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR14 quasar sample: anisotropic clustering analysis in configuration-space
Jiamin Hou, Ariel G. Sánchez, Román Scoccimarro +20
We explore the cosmological implications of anisotropic clustering measurements of the quasar sample from Data Release 14 of the Sloan Digital Sky Survey IV Extended Baryon Oscilla…
Testing averaged cosmology with type Ia supernovae and BAO data
B. Santos, A. A. Coley, N. Chandrachani Devi +1
An important problem in precision cosmology is the determination of the effects of averaging and backreaction on observational predictions, particularly in view of the wealth of ne…
Bayesian comparison of nonstandard cosmologies using type Ia supernovae and BAO data
B. Santos, N. Chandrachani Devi, J. S. Alcaniz
We use the most recent type Ia supernovae (SNe Ia) observations to perform a statistical comparison between the standard CDM model and its extensions [CDM and CDM] and…
An Accurate Cluster Selection Function for the J-PAS Narrow-Band wide-field survey
Begoña Ascaso, Narciso Benítez, Renato Dupke +19
The impending Javalambre Physics of the accelerating universe Astrophysical Survey (J-PAS) will be the first wide-field survey of 8500 deg to reach the `stage IV' cat…
Number Counts and Dynamical Vacuum Cosmologies
N. Chandrachani Devi, H. A. Borges, S. Carneiro +1
We study non-linear structure formation in an interacting model of the dark sector of the Universe in which the dark energy density decays linearly with the Hubble parameter, $ρ_Λ…
Geodesic Motion in Schwarzschild Spacetime Surrounded by Quintessence
Rashmi Uniyal, N. Chandrachani Devi, Hemwati Nandan +1
We study the time-like geodesic congruences, in the space-time geometry of a Schwarzschild black hole surrounded by quintessence. The nature of effective potential along with the s…
J-PAS: The Javalambre-Physics of the Accelerated Universe Astrophysical Survey
N. Benitez, R. Dupke, M. Moles +149
The Javalambre-Physics of the Accelerated Universe Astrophysical Survey (J-PAS) is a narrow band, very wide field Cosmological Survey to be carried out from the Javalambre Observat…
Constraining thawing and freezing models with cluster number counts
N. Chandrachani Devi, J. E. Gonzalez, J. S. Alcaniz
Measurements of the cluster abundance as a function of mass and redshift provide an important cosmological test that probe not only the expansion rate but also the growth of pertur…
Constraining Thawing Dark Energy using Galaxy Cluster Number Counts
N. Chandrachani Devi, T. Roy Choudhury, Anjan A. Sen
We study the formation of galaxy clusters in the presence of thawing class of scalar field dark energy. We consider cases where the scalar field has canonical as well non canonical…
WMAP Constraints On K-Inflation
N. Chandrachani Devi, Akhilesh Nautiyal, Anjan A Sen
We study the K-Inflation models where the inflaton field has non-canonical kinetic term. In particular, we consider the Dirac-Born-Infeld (DBI) form for the kinetic energy of the i…
Solar System Constraints on Scalar Tensor Theories with Non-Standard Action
N. Chandrachani Devi, Sudhakar Panda, Anjan A Sen
We compute the Post-Newtonian parameter (PPN),, for scalar-tensor gravity theory when the action functional for the scalar field is a non-standard one, namely the Dirac-Born-Inf…
Evolution of Spherical Overdensity in Thawing Dark energy Models
N. Chandrachani Devi, Anjan A Sen
We study the general evolution of spherical over-densities for thawing class of dark energy models. We model dark energy with scalar fields having canonical as well as non-canonica…
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…