284 citations · 803 across the 16 of their papers we have counts for
16 papers
T-Duality Selection of a Disformal Effective Metric in String Gas Cosmology
Ali Nayeri
We study a restricted disformal completion of string-frame string gas cosmology in which the light sector propagates on an effective metric with matter-cone opening . Requiri…
Inflationary branch decoherence and the cosmological arrow of time
Ali Nayeri
We analyze branch decoherence in inflationary quantum cosmology by computing reduced density matrices and branch-overlap factors for long-wavelength perturbations. The Hartle-Hawki…
Closed String Thermodynamics and a Blue Tensor Spectrum
Robert H. Brandenberger, Ali Nayeri, Subodh P. Patil
The BICEP-2 team has reported the detection of primordial cosmic microwave background B-mode polarization, with hints of a suppression of power at large angular scales relative to…
More on the Spectrum of Perturbations in String Gas Cosmology
Robert H. Brandenberger, Sugumi Kanno, Jiro Soda +5
String gas cosmology is rewritten in the Einstein frame. In an effective theory in which a gas of closed strings is coupled to a dilaton gravity background without any potential fo…
String Gas Cosmology and Structure Formation
Robert H. Brandenberger, Ali Nayeri, Subodh P. Patil +1
It has recently been shown that a Hagedorn phase of string gas cosmology may provide a causal mechanism for generating a nearly scale-invariant spectrum of scalar metric fluctuatio…
Inflation Free, Stringy Generation of Scale-Invariant Cosmological Fluctuations in D = 3 + 1 Dimensions
Ali Nayeri
We propose an alternative scenario to cosmic inflation for producing the initial seeds of cosmic structures. The cosmological fluctuations are generated by thermal fluctuation of t…