Dark radiation in LARGE volume models

By M. Cicoli, Joseph P. Conlon, F. Quevedo. 2012

190 citations recorded by the source corpus.

We consider reheating driven by volume modulus decays in the LARGE Volume Scenario. Such reheating always generates non-zero dark radiation through the decays to the axion partner, while the only competitive visible sector decays are Higgs pairs via the Giudice-Masiero term. In the framework of sequestered models where the cosmological moduli problem is absent, the simplest model with a shift-symmetric Higgs sector generates 1.56 < N_{eff} - N_{eff,SM} < 1.74. For more general cases, the known experimental bounds on N_{eff} strongly constrain the parameters and matter content of the models.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/6ec11278d88036467052a9cfeb985d647f55d1b9

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Citations in the corpus

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.”
The Kreuzer-Skarke axiverse (2018, unknown): “s 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]. Axions with m˘10 33 eV can be quintessence elds [30], and in special cases could even allev”
Cosmological Moduli and the Post-Inflationary Universe: A Critical Review (2015, background): “Two questions thus naturally arise: (i) how generic is the presence of dark radiation in string compactifications?, and (ii) if both dark radiation and dark matter have a common origin from the decay of a string modulus, can one find a correlation between them by combining dark matter observational ”
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.”
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.”
Physics potential of the International Axion Observatory (IAXO) (2019, background): “The relevant value of ∆Neff is given by [50, 51]:”