84 research outputs found
Axion Poltergeist
Rotations of axion fields in the early universe can produce dark matter and
the matter-antimatter asymmetry of the universe. We point out that the rotation
can generate an observable amount of a stochastic gravitational-wave (GW)
background. It can be doubly enhanced in a class of models in which the
equation of state of the rotations rapidly changes from a non-relativistic
matter-like one to a kination-like one by 1) the so-called poltergeist
mechanism and 2) slower redshift of GWs compared to the axion kination fluid.
In supersymmetric UV completion, future GW observations can probe the
supersymmetry-breaking scale up to GeV even if the axion does not
directly couple to the Standard Model fields.Comment: 7 pages, 4 figures (Supplemental Material: 13 pages, 3 figures), v2:
version published in PRD letter (except for the title). minor revisio
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Gravitational wave production from axion rotations right after a transition to kination
Rotations of axion fields in the early Universe can produce dark matter and the matter-antimatter asymmetry of the Universe. We point out that the rotation can generate an observable amount of a stochastic gravitational wave (GW) background. It can be doubly enhanced in a class of models in which the equation of state of the rotations rapidly changes from a nonrelativistic matterlike one to a kinationlike one by (1) the so-called poltergeist mechanism and (2) slower redshift of GWs compared to the axion-kination fluid. In supersymmetric UV completion, future GW observations can probe the supersymmetry-breaking scale up to even if the axion does not directly couple to the Standard Model fields
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