Dark radiation and the Hagedorn phase - INSPIRE

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Dark radiation and the Hagedorn phase

Aug 6, 2021

13 pages

Published in:

Phys.Rev.D 105 (2022) 6, 066007

Published: Mar 15, 2022

e-Print:

2108.03317 [hep-th]

DOI:

10.1103/PhysRevD.105.066007 (publication)

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Abstract: (APS)

We point out that if the sector associated with the Standard Model degrees of freedom entered an open string Hagedorn phase in the early universe while the dark radiation sector was not part of this plasma, then this can lead to low values of the observable

Δ N_{eff}

(effective number of additional neutrinolike species). For explicit analysis, we focus on warped string compactifications with the Standard Model degrees of freedom at the bottom of a warped throat. If the Hubble scale during inflation is above the warped string scale associated with the throat, then the Standard Model sector will enter the Hagedorn phase. In this scenario, bulk axions are no longer dangerous from the point of view of dark radiation. While this article focuses on warped compactifications, the basic idea can be relevant to any scenario where the early universe entered a Hagedorn phase.

Note:

v2. 7pp double-columned, somewhat improved discussion, minor clarifications, matches published version up to typography/formatting

scale: string
throat: warped
compactification: warped
string: compactification
string: open
dark matter
Hagedorn
inflation
plasma
axion

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Figures(0)

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