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Updated: Jul 25, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
Producing a scale-invariant spectrum of perturbations in a Hagedorn phase of string cosmology
Ali Nayeri1, Robert H Brandenberger, Cumrun Vafa
1Jefferson Physical Laboratory, Harvard University, Cambridge, Massachusetts 02138, USA. nayeri@schwinger.harvard.edu
Abstract:
We study the generation of cosmological perturbations during the Hagedorn phase of string gas cosmology. Using tools of string thermodynamics we provide indications that it may be possible to obtain a nearly scale-invariant spectrum of cosmological fluctuations on scales which are of cosmological interest today. In our cosmological scenario, the early Hagedorn phase of string gas cosmology goes over smoothly into the radiation-dominated phase of standard cosmology, without having a period of cosmological inflation.
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