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65 papers · 1 filter
Constraints on dark energy models from radial baryon acoustic scale measurements
Lado Samushia, Bharat Ratra
We use the radial baryon acoustic oscillation (BAO) measurements of Gaztanaga et al. (2008) to constrain parameters of dark energy models. These constraints are comparable with con…
Gravitational Radiation from Primordial Helical Inverse Cascade MHD Turbulence
Tina Kahniashvili, Leonardo Campanelli, Grigol Gogoberidze +2
We consider the generation of gravitational waves by primordial helical inverse cascade magnetohydrodynamic (MHD) turbulence produced by bubble collisions at the electroweak phase…
Detectability of Gravitational Waves from Phase Transitions
Tina Kahniashvili, Arthur Kosowsky, Grigol Gogoberidze +1
Gravitational waves potentially represent our only direct probe of the universe when it was less than one second old. In particular, first-order phase transitions in the early univ…
CMB Temperature Anisotropy from Broken Spatial Isotropy due to an Homogeneous Cosmological Magnetic Field
Tina Kahniashvili, George Lavrelashvili, Bharat Ratra
We derive the cosmic microwave background temperature anisotropy two-point correlation function (including off-diagonal correlations) from broken spatial isotropy due to an arbitra…
Testing Lorentz Invariance Violation with WMAP Five Year Data
Tina Kahniashvili, Ruth Durrer, Yurii Maravin
We consider different renormalizable models of Lorentz invariance violation. We show that the limits on birefringence of the propagation of cosmic microwave background photons from…
Constraints on dark energy from baryon acoustic peak and galaxy cluster gas mass measurements
Lado Samushia, Bharat Ratra
We use baryon acoustic peak measurements by Eisenstein et al. (2005) and Percival et al. (2007a) and galaxy cluster gas mass fraction measurements of Allen et al. (2008) to constra…