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Probing multi-state dark matter via optical absorption lines in DESI spectra
Anoma Ganguly, Shadab Alam
We search for dark matter through absorption lines imprinted on the spectra of background sources whose sightlines pass through foreground dark matter halos. Such a line is a gener…
Cosmological perturbations with gravity scalarons : Galaxy power spectra and the scalaron mass
Abhijit Talukdar, Sanjeev Kalita, Shadab Alam
In this paper we study cosmological perturbations with gravity scalaron. We consider epoch of transition from early general relativity (GR) phase to late time non-GR phase o…
Cosmology-Independent Constraints on the Etherington Relation and SNeIa Absolute Magnitude Evolution from DESI-DR2
Sourav Das, Surhud More, Shadab Alam
We carry out a test of the fundamental Etherington relation (cosmic distance duality relation) which relates the luminosity distance and angular diameter distance $D_{\…
Stabilizing simulation-based cosmological Fisher forecasts: a case study using the Voronoi volume function
Saee Dhawalikar, Aseem Paranjape, Shadab Alam
Forecasting cosmological constraints from halo-based statistics often suffers from instability in derivative estimates, especially when the number of simulations is limited. This i…
Detection of cosmological dipoles aligned with transverse peculiar velocities
Yan-Chuan Cai, John A. Peacock, Anna de Graaff +1
Peculiar velocities encode rich cosmological information, but their transverse components are hard to measure. Here, we present the first observations of a novel effect of transver…
The Atacama Cosmology Telescope DR6 and DESI: Structure growth measurements from the cross-correlation of DESI Legacy Imaging galaxies and CMB lensing from ACT DR6 and Planck PR4
Frank J. Qu, Qianjun Hang, Gerrit Farren +51
We measure the growth of cosmic density fluctuations on large scales and across the redshift range through the cross-correlation of the ACT DR6 CMB lensing map and gala…