Search Publications
Testing gravity on cosmic scales: A case study of Jordan-Brans-Dicke theory
Joudaki, Shahab; Ferreira, Pedro G.; Lima, Nelson A. +1 more
We provide an end-to-end exploration of a distinct modified gravitational theory in Jordan-Brans-Dicke (JBD) gravity, from an analytical and numerical description of the background expansion and linear perturbations, to the nonlinear regime captured with a hybrid suite of N -body simulations, to the cosmological constraints from existing probes of…
Galaxy luminosity function pipeline for cosmology and astrophysics
Muñoz, Julian B.; Sabti, Nashwan; Blas, Diego
Observations of high-redshift galaxies have provided us with a rich tool to study the physics at play during the epoch of reionization. The luminosity function (LF) of these objects is an indirect tracer of the complex processes that govern galaxy formation, including those of the first dark-matter structures. In this work, we present an extensive…
Can high-redshift Hubble diagrams rule out the standard model of cosmology in the context of cosmography?
Pourojaghi, S.; Zabihi, N. F.; Malekjani, M.
Using mock data for the Hubble diagrams of type Ia supernovae (SNIa) and quasars (QSOs) generated based on the standard model of cosmology, and using the least-squares method based on the Markov-Chain-Monte-Carlo (MCMC) algorithm, we first put constraints on the cosmographic parameters in the context of the various model-independent cosmographic m…
Modeling intrinsic galaxy alignment in the MICE simulation
Carretero, Jorge; Castander, Francisco J.; DES Collaboration +9 more
The intrinsic alignment (IA) of galaxies is potentially a major limitation in deriving cosmological constraints from weak lensing surveys. In order to investigate this effect, we assign intrinsic shapes and orientations to galaxies in the light-cone output of the MICE simulation, spanning ∼5000 deg2 and reaching redshift z =1.4 . This a…
Improved white dwarves constraints on inelastic dark matter and left-right symmetric models
Biswas, Anirban; Kar, Arpan; Kim, Hyomin +2 more
Weakly interacting massive particles (WIMPs) can be captured in compact stars such as white dwarves (WDs) if they are in a dark matter (DM)-rich environment, leading to an increase in the star luminosity through their annihilation process. N -body simulations suggest that the core of the Messier 4 globular cluster (where plenty of WDs are observed…