An M theory solution to the strong CP-problem, and constraints on the axiverse
By Bobby Samir Acharya, Konstantin Bobkov, Piyush Kumar. 2010
206 citations recorded by the source corpus.
We give an explicit realization of the “StringAxiverse” discussed in Arvanitaki et. al [1] by extending our previous results on moduli stabilization in M theory to include axions. We extend the analysis of [1] to allow for high scale inflation that leads to a moduli dominated pre-BBN Universe. We demonstrate that an axion which solves the strong-CP problem naturally arises and that both the axion decay constants and GUT scale can consistently be around 2 × 1016 GeV with a much smaller fine tuning than is usually expected. Constraints on the Axiverse from cosmological observations, namely isocurvature perturbations and tensor modes are described. Extending work of Fox et. al [2], we note that the observation of tensor modes at Planck will falsify the Axiverse completely. Finally we note that Axiverse models whose lightest axion has mass of order 10−15 eV and with decay constants of order 5 × 1014 GeV require no (anthropic) fine-tuning, though standard unification at 1016 GeV is difficult to accommodate.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/42821f876e8e467094ca2e9da3df97b0bcb123f7
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Citations in the corpus
- Cosmological Moduli and the Post-Inflationary Universe: A Critical Review (2015, background): “However, a particular challenge for string/M-theory approaches is embedding the visible sector.”
- Exploring the Role of Axions and Other WISPs in the Dark Universe (2012, background): “It works in fact generically for bosonic WISPs such as ALPs [19,20,27] and”
- Revisiting the SN1987A gamma-ray limit on ultralight axion-like particles (2014, unknown): “[5–7]); for a review, see e.”
- The landscape of QCD axion models (2020, background): “85This abundance of pseudoscalars, a large number of which could remain ultralight, has led to concoct the so called string axiverse [784–786], wherein hundreds of light axion-like particles populate a logarithmically distributed mass spectrum possibly down to the Hubble scale ∼ 10−33 eV.”
- The type IIB string axiverse and its low-energy phenomenology (2012, background): “The same paper (1)This is true not just for type IIB strings but also for heterotic orbifolds [18] or M-theory compactifications [22].”