7 papers
Reconstruction of a dark energy model for the Dirac-Born-Infeld scalar field with the Hubble and DESI data via Gaussian process
Sayantan Ghosh, Gaurav N. Gadbail, P. K. Sahoo +1
In this study, we reconstruct the dark energy (DE) as a Dirac-Born-Infeld (DBI) scalar field from the Hubble dataset (32 CC + 26 BAO) and the DESI dataset using the Gaussian proces…
A model-independent measurement of the Hubble constant from gravitational-wave standard sirens and electromagnetic observations
Gaurav N. Gadbail, Kazuharu Bamba
The Hubble tension is one of the most significant challenges in modern cosmology. Developing new approaches to estimate the Hubble constant is therefore crucial, and in this work,…
A sound-horizon-free measurement of the Hubble constant from DESI DR2 baryon acoustic oscillations using artificial neural networks
Gaurav N. Gadbail, Kazuharu Bamba
We present a model-independent, sound-horizon-free measurement of the Hubble constant using baryon acoustic oscillation tracers from the Dark Energy Spectroscopic Instrument…
Accelerated Expansion of the Universe in Nonmetricity-based Modified Gravity
Gaurav N. Gadbail
This thesis explores the cosmological implications of modified gravity, focusing on nonmetricity-based gravity as an alternative to the CDM model in explaining cosmic ac…
Cosmological dynamics of interacting dark energy and dark matter in gravity
Gaurav N. Gadbail, Simran Arora, Phongpichit Channuie +1
In this work, we explore the behavior of interacting dark energy and dark matter within a model of gravity, employing a standard framework of dynamical system analysis. We c…
Reconstruction of the scalar field potential in nonmetricity gravity through Gaussian processes
Gaurav N. Gadbail, Sanjay Mandal, P. K. Sahoo +1
The accelerated expansion of the universe has been widely confirmed, posing challenges to the standard CDM model, particularly the cosmological coincidence problem. This has mo…