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Probing the early Universe with axion physics and gravitational waves
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Uppsala University, Sweden.
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 12, article id 123513Article in journal (Refereed) Published
Abstract [en]

We show results for the expected reach of the network of experiments that is being set up globally with the aim of detecting the invisible axion, in light of a nonstandard thermal history of the universe. Assuming that the axion is the dark matter, we discuss the reach of a successful detection by a given experimental setup in a particular axion mass window for different modifications of the cosmological background before primordial nucleosynthesis occurred. Results are presented both in the case where the present energy budget in cold axions is produced through the vacuum realignment mechanism alone, or in the case in which axionic strings also provide with additional contributions to the axion energy density. We also show that in some cosmological models, the spectrum of gravitational waves from the axionic string network would be within reach of the future network of detectors like LISA and DECIGO-BBO. We conclude that some scenarios describing the early universe can be probed jointly by the experimental efforts on axion detection and by gravity wave multimessenger astronomy.

Place, publisher, year, edition, pages
2019. Vol. 99, no 12, article id 123513
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-170847DOI: 10.1103/PhysRevD.99.123513ISI: 000471985700002OAI: oai:DiVA.org:su-170847DiVA, id: diva2:1339163
Available from: 2019-07-26 Created: 2019-07-26 Last updated: 2019-07-26Bibliographically approved

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Visinelli, Luca
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