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Cosmological window onto the string axiverse and the supersymmetry breaking scale
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Uppsala University, Sweden.
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Nordic Institute for Theoretical Physics (Nordita).ORCID iD: 0000-0002-7614-6677
Number of Authors: 22019 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 99, no 6, article id 063517Article in journal (Refereed) Published
Abstract [en]

In the simplest picture, the masses of string axions populating the axiverse depend on two parameters: the supersymmetry-breaking scale M-susy and the action S of the string instantons responsible for breaking the axion shift symmetry. In this work, we explore whether cosmological data can be used to probe these two parameters. Adopting string-inspired flat priors on log(10) M-susy and S and imposing that M-susy be sub-Planckian, we find S = 198 +/- 28. These bounds suggest that cosmological data complemented with string-inspired priors select a quite narrow axion mass range within the axiverse, log(10)(m(a)/eV) = -21.5(-2.3)(+1.3). We find that M-susy remains unconstrained due to a fundamental parameter degeneracy with S. We explore the significant impact of other choices of priors on the results, and we comment on similar findings in recent previous literature.

Place, publisher, year, edition, pages
2019. Vol. 99, no 6, article id 063517
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-168379DOI: 10.1103/PhysRevD.99.063517ISI: 000461908800005OAI: oai:DiVA.org:su-168379DiVA, id: diva2:1313810
Available from: 2019-05-06 Created: 2019-05-06 Last updated: 2019-05-06Bibliographically approved

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Visinelli, LucaVagnozzi, Sunny
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