497 citations · 8.4k across the 112 of their papers we have counts for
6 papers · 1 filter
Fables of reconstruction: controlling bias in the dark energy equation of state
Robert G. Crittenden, Gong-Bo Zhao, Levon Pogosian +2
We develop an efficient, non-parametric Bayesian method for reconstructing the time evolution of the dark energy equation of state w(z) from observational data. Of particular impor…
Cosmological tests of General Relativity: a principal component analysis
Alireza Hojjati, Gong-Bo Zhao, Levon Pogosian +3
The next generation of weak lensing surveys will trace the evolution of matter perturbations and gravitational potentials from the matter dominated epoch until today. Along with co…
Testing gravity with CAMB and CosmoMC
Alireza Hojjati, Levon Pogosian, Gong-Bo Zhao
We introduce a patch to the commonly used public codes CAMB and CosmoMC that allows the user to implement a general modification of the equations describing the growth of cosmologi…
Seeking String Theory in the Cosmos
Edmund J. Copeland, Levon Pogosian, Tanmay Vachaspati
We review the existence, formation and properties of cosmic strings in string theory, the wide variety of observational techniques that are being employed to detect them, and the c…
Primordial Magnetism in the CMB: Exact Treatment of Faraday Rotation and WMAP7 Bounds
Levon Pogosian, Amit P. S. Yadav, Yi-Fung Ng +1
Faraday rotation induced B-modes can provide a distinctive signature of primordial magnetic fields because of their characteristic frequency dependence and because they are only we…
Constraints on the fundamental string coupling from B-mode experiments
Anastasios Avgoustidis, Edmund J. Copeland, Adam Moss +3
We study signatures of cosmic superstring networks containing strings of multiple tensions and Y-junctions, on the cosmic microwave background (CMB) temperature and polarisation sp…