Dark radiation and dark matter in large volume compactifications

By Tetsutaro Higaki, F. Takahashi. 2012

154 citations recorded by the source corpus.

A bstractWe argue that dark radiation is naturally generated from the decay of the overall volume modulus in the LARGE volume scenario. We consider both sequestered and non-sequestered cases, and find that the axionic superpartner of the modulus is produced by the modulus decay and it can account for the dark radiation suggested by observations, while the modulus decay through the Giudice-Masiero term gives the dominant contribution to the total decay rate. In the sequestered case, the lightest supersymmetric particles produced by the modulus decay can naturally account for the observed dark matter density. In the non-sequestered case, on the other hand, the supersymmetric particles are not produced by the modulus decay, since the soft masses are of order the heavy gravitino mass. The QCD axion will then be a plausible dark matter candidate.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c9032983282c8a8f91d1c28c1fc3c21757499019

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Citations in the corpus

Towards universal axion inflation and reheating in string theory (2014, background): “In both cases, the big cycle axion was still massless at this stage and could still lead to dark radiation [29, 30] via the large Kähler modulus decay.”
Explicit de Sitter flux vacua for global string models with chiral matter (2013, background): “This bulk axion behaves as dark radiation [82, 83] and gets produced by the decay of the light volume modulus which drives reheating after the end of inflation.”
New experimental approaches in the search for axion-like particles (2018, background): “We have chosen their average momentum to be p0 = 300 eV as typical from the moduli masses ∼ 10(6) − 10(7) GeV motivated in scenarios [297, 298].”
The type IIB string axiverse and its low-energy phenomenology (2012, background): “[48, 49] showed that the decay of τb gives rise to dark radiation made of light volume axions.”
The Kreuzer-Skarke axiverse (2018, unknown): “For example, if the lightest modulus decays only to a single axion, as well as to Standard Model particles, the dark radiation constraints are insensitive to the existence of other axions and moduli [29], but can be severe nonetheless [27, 28].”