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6 papers · 2 filters
CMB anisotropies due to cosmological magnetosonic waves
Tina Kahniashvili, Bharat Ratra
We study scalar mode perturbations (magnetosonic waves) induced by a helical stochastic cosmological magnetic field and derive analytically the corresponding cosmic microwave backg…
Cosmological Constraints from Hubble Parameter versus Redshift Data
Lado Samushia, Bharat Ratra
We use the Simon, Verde, & Jimenez (2005) determination of the redshift dependence of the Hubble parameter to constrain cosmological parameters in three dark energy cosmological mo…
Gamma Ray Burst Constraints on Ultraviolet Lorentz Invariance Violation
Tina Kahniashvili, Grigol Gogoberidze, Bharat Ratra
We present a unified general formalism for ultraviolet Lorentz invariance violation (LV) testing through electromagnetic wave propagation, based on both dispersion and rotation mea…
Effects of primordial helicity on CMB
Tina Kahniashvili
I present here a brief overview of the effects caused by parity violating cosmological sources (such as magnetic or kinetic helicity) on the CMB fluctuations. I discuss also primor…
Supernova Ia and Galaxy Cluster Gas Mass Fraction Constraints on Dark Energy
Kyle M. Wilson, Gang Chen, Bharat Ratra
We use the Riess et al.(2004) supernova Ia apparent magnitude versus redshift data and the Allen et al.(2004) galaxy cluster gas mass fraction versus redshift data to constrain dar…
Inflation and accelerated expansion TeVeS cosmological solutions
Luz Maria Diaz-Rivera, Lado Samushia, Bharat Ratra
We find exact exponentially expanding and contracting de Sitter solutions of the spatially homogeneous TeVeS cosmological equations of motion in the vacuum TeVeS model and a power…