The type IIB string axiverse and its low-energy phenomenology

By M. Cicoli, M. Goodsell, A. Ringwald. 2012

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A bstractWe study closed string axions in type IIB orientifold compactifications. We show that for natural values of the background fluxes the moduli stabilisation mechanism of the LARGE Volume Scenario (LVS) gives rise to an axiverse characterised by the presence of a QCD axion plus many light axion-like particles whose masses are logarithmically hierarchical. We study the phenomenological features of the LVS axiverse, deriving the masses of the axions and their couplings to matter and gauge fields. We also determine when closed string axions can solve the strong CP problem, and analyse the first explicit examples of semi-realistic models with stable moduli and a QCD axion candidate which is not eaten by an anomalous Abelian gauge boson. We discuss the impact of the choice of inflationary scenario on the LVS axiverse, and summarise the astrophysical, cosmological and experimental constraints upon it. Moreover, we show how models can be constructed with additional light axion-like particles that could explain some intriguing astrophysical anomalies, and could be searched for in the next generation of axion helioscopes and light-shining-through-a-wall experiments.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8a4e58f2769872e08d116b5caf4f064d9740a6cb

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Citations in the corpus

The landscape of QCD axion models (2020, background): “[786] (see also Ref.”
A White Paper on keV sterile neutrino Dark Matter (2016, background): “We conclude this subsection by noting that in a string-theoretic framework, many axions might exist that could mix with each other [859, 860].”
Conceptual design of the International Axion Observatory (IAXO) (2014, background): “lution to the DM problem. Mixed WIMP-axion DM is one possibility favored in some theories [8, 9]. More generic axion-like particles (ALPs) appear in diverse extensions of the SM (e.g., string theory) [10, 11, 12]. ALPs could also be the DM [13] and are repeatedly invoked to explain some astrophysica”
New experimental approaches in the search for axion-like particles (2018, background): “Indeed string theories predict the existence of many axion-like particle candidates [21, 22] one of which would be the QCD axion, but the rest could still play a similar phenomenological role [23].”
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Any Light Particle Search II -- Technical Design Report (2013, background): “e f a is the symmetry breaking scale, a the ﬁne structure constant, c is a constant of O(1) and f a ˘M s. Thus ALPs from intermediate string scales can very well occur in the g ag ˘10 12 GeV 1 regime [29], as sketched in Fig. 2. Unlike for axions, for axion-like relation the ALP-photon coupling to c”
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Cool WISPs for stellar cooling excesses (2015, background): “Intriguingly, in LARGE volume string compactifications, in which the volume V of the compactified extra dimensions is stabilized at an exponentially large value in units of the string size, the decay constant of closed string ALPs is generically much smaller than the Planck scale, fa ∼ MPl/ √ V, and”