TY - JOUR

T1 - Atick-Witten Hagedorn Conjecture, near scale-invariant matter and blue-tilted gravity power spectrum

AU - Biswas, Tirthabir

AU - Koivisto, Tomi

AU - Mazumdar, Anupam

N1 - Open Access, c The Authors. Article funded by SCOAP3. The original publication is available at www.link.springer.com

PY - 2014/8/21

Y1 - 2014/8/21

N2 - We will provide an interesting new mechanism to generate almost scale invariant seed density perturbations with a red spectrum, while keeping the gravitational wave spectrum blue-tilted in a stringy thermal contracting phase at temperatures beyond the Hagedorn temperature. This phase is often referred to as the Hagedorn phase where the free energy has been conjectured by Atick and Witten to grow more slowly than ordinary radiation. The primordial fluctuations are created by the statistical thermal fluctuations determined by the partition function, rather than quantum vacuum driven fluid dynamical fluctuations. Our mechanism assumes a non-singular bounce.

AB - We will provide an interesting new mechanism to generate almost scale invariant seed density perturbations with a red spectrum, while keeping the gravitational wave spectrum blue-tilted in a stringy thermal contracting phase at temperatures beyond the Hagedorn temperature. This phase is often referred to as the Hagedorn phase where the free energy has been conjectured by Atick and Witten to grow more slowly than ordinary radiation. The primordial fluctuations are created by the statistical thermal fluctuations determined by the partition function, rather than quantum vacuum driven fluid dynamical fluctuations. Our mechanism assumes a non-singular bounce.

KW - Cosmology of Theories beyond the SM

KW - String Field Theory

U2 - 10.1007/JHEP08(2014)116

DO - 10.1007/JHEP08(2014)116

M3 - Journal article

VL - 1408

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 8

M1 - 116

ER -