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32 papers
Unbiased Bayesian Inference of Peculiar Motions of Galaxies from Type Ia Supernovae Observations
Ujjwal Upadhyay, Tarun Deep Saini, Shiv K. Sethi
The peculiar motions of galaxies are powerful cosmological probes that trace the growth of structures and the distribution of matter in the universe, providing a means to investiga…
A Bayesian estimator for peculiar velocity correction in cosmological inference from supernovae data
Ujjwal Upadhyay, Tarun Deep Saini, Shiv K. Sethi
The peculiar motion of the host galaxies introduces bias in estimating cosmological parameters from supernova data. The coherent component of the peculiar motion is usually correct…
Measuring the Hubble constant: Gravitational wave observations meet galaxy clustering
Remya Nair, Sukanta Bose, Tarun Deep Saini
We show how the distances to binary black holes measured in gravitational wave observations with ground-based interferometers can be used to constrain the redshift-distance relatio…
Effect of dark matter halo on global spiral modes in a collisionless galactic disc
Soumavo Ghosh, Tarun Deep Saini, Chanda J. Jog
Low surface brightness (LSB) galaxies are dominated by dark matter halo from the innermost radii; hence they are ideal candidates to investigate the influence of dark matter on dif…
Modal analysis of gravitational instabilities in nearly Keplerian, counter-rotating collisionless discs
Mamta Gulati, Tarun Deep Saini
We present a modal analysis of instabilities of counter-rotating, self-gravitating collisionless stellar discs, using the recently introduced modified WKB formulation of spiral den…
A modified WKB formulation for linear eigenmodes of a collisionless self-gravitating disc in the epicyclic approximation
Mamta Gulati, Tarun Deep Saini
The short--wave asymptotics (WKB) of spiral density waves in self-gravitating stellar discs is well suited for the study of the dynamics of tightly--wound wavepackets. But the text…