59 citations · 134 across the 11 of their papers we have counts for
11 papers
Cosmological constraints and standard sirens forecasts for non-dynamical dark energy in Horndeski gravity
Marcello Miranda, Ruchika, Ivan De Martino +2
We investigate an analytically tractable sector of the Extended Cuscuton model, a non-dynamical dark-energy realization within the framework of viable Horndeski gravity. We focus o…
Present Day Cosmic Acceleration from SDSS and DESI BAO: A Call for Finer Tomography of the DESI Bright Galaxy Survey
Anna Chiara Ferri, Ruchika, Alessandro Melchiorri
The DESI collaboration's Data Release~2 (DR2) provides baryon acoustic oscillation (BAO) measurements from over 14 million galaxies and quasars, and a joint analysis of DESI BAO, C…
Optical depth to reionization in a Universe with multiple inhomogeneous domains
Shashank Shekhar Pandey, Ruchika, Subhadeep Mukherjee +1
We study the optical depth to reionization in a cosmological setting that includes backreaction from matter inhomogeneities, using the Buchert averaging formalism. We construct a s…
Hubble Tension and the G-step Model: Re-examination of Recent Constraints on Modified Local Physics
Leandros Perivolaropoulos, Ruchika
We critically examine recent claims challenging the viability of the G-step model (GSM) as a solution to the Hubble tension. The GSM proposes a 4 % increase in the effective…
Resilience and implications of adiabatic CMB cooling
Ruchika, William Giarè, Elsa M. Teixeira +1
We investigate potential deviations from the standard adiabatic evolution of the cosmic microwave background (CMB) temperature, , using the latest Sunyaev-Zeldovich…
Effects of a local physics change on the SH0ES determination of
Ruchika, Leandros Perivolaropoulos, Alessandro Melchiorri
The Hubble tension, a significant discrepancy between the Hubble constant () values derived from early-time (Cosmic Microwave Background and Baryon Acoustic Oscillations) and…
A double take on early and interacting dark energy from JWST
Matteo Forconi, William Giarè, Olga Mena +4
The very first light captured by the James Webb Space Telescope (JWST) revealed a population of galaxies at very high redshifts more massive than expected in the canonical CDM m…
Coupled Quintessence scalar field model in light of observational datasets
Trupti Patil, Ruchika, Sukanta Panda
We do a detailed analysis of a well-theoretically motivated interacting dark energy scalar field model with a time-varying interaction term. Using current cosmological datasets fro…
Do the Early Galaxies observed by JWST disagree with Planck's CMB polarization measurements?
Matteo Forconi, Ruchika, Alessandro Melchiorri +2
The recent observations from the James Webb Space Telescope have led to a surprising discovery of a significant density of massive galaxies with masses of $M \ge 10^{10.5} M_{\odot…
A gravitational constant transition within cepheids as supernovae calibrators can solve the Hubble tension
Ruchika, Himansh Rathore, Shouvik Roy Choudhury +1
Local universe measurements of the Hubble constant (H0) using SNe Ia with Cepheids as calibrators yield a value of H0 which is in tension with the value inferred from the CMB and o…
Low-redshift estimates of the absolute scale of baryon acoustic oscillations
Thais Lemos, Ruchika, Joel C. Carvalho +1
Measurements of the characteristic length scale of the baryon acoustic oscillations (BAO) provide a robust determination of the distance-redshift relation. Currently, the bes…