Corpus ID: 237581125

Friendship in the Axiverse: Late-time direct and astrophysical signatures of early-time nonlinear axion dynamics

@inproceedings{Cyncynates2021FriendshipIT,
  title={Friendship in the Axiverse: Late-time direct and astrophysical signatures of early-time nonlinear axion dynamics},
  author={David Cyncynates and Tudor Giurgica-Tiron and Olivier Simon and Jedidiah O. Thompson},
  year={2021}
}
A generic low-energy prediction of string theory is the existence of a large collection of axions, commonly known as a string axiverse. Axions also have a natural cosmological production mechanism, vacuum misalignment, making them well-motivated dark matter (DM) candidates. Much work on axion production has considered the case of a single free axion, but in a realistic axiverse, string axions are expected to be distributed densely over many orders of magnitude in mass, and to interact with one… Expand
1 Citations
Cosmology of the companion-axion model: dark matter, gravitational waves, and primordial black holes
Zhe Chen,1, ∗ Archil Kobakhidze,1, † Ciaran A. J. O’Hare,2, ‡ Zachary S. C. Picker,2, § and Giovanni Pierobon3, ¶ Sydney Consortium for Particle Physics and Cosmology, School of Physics, TheExpand

References

SHOWING 1-10 OF 133 REFERENCES
Large-misalignment mechanism for the formation of compact axion structures: Signatures from the QCD axion to fuzzy dark matter
Axions are some of the best motivated particles beyond the Standard Model. We show how the attractive self-interactions of dark matter (DM) axions over a broad range of masses, from $10^{-22}$ eV toExpand
String Axiverse
String theory suggests the simultaneous presence of many ultralight axions, possibly populating each decade of mass down to the Hubble scale 10−33eV. Conversely the presence of such a plenitude ofExpand
Axion misalignment driven to the hilltop
A bstractThe QCD axion serves as a well-motivated dark matter candidate and the misalignment mechanism is known to reproduce the observed abundance with a decay constant fa ≃ O$$ \mathcal{O} $$(1012)Expand
ADMX Status
Nearly all astrophysical and cosmological data point convincingly to a large component of cold dark matter (CDM) in the Universe. The axion particle, first theorized as a solution to the strongExpand
Cosmological Perturbations of Extreme Axion in the Radiation Era
Sub-horizon perturbations under the extreme initial condition of the axion model are investigated, where initial axion angles start near the potential maximum. This work focuses on a few new featuresExpand
Discovering the QCD Axion with Black Holes and Gravitational Waves
Advanced LIGO may be the first experiment to detect gravitational waves. Through superradiance of stellar black holes, it may also be the first experiment to discover the QCD axion with decayExpand
Ultralight Repulsive Dark Matter and BEC
Ultralight scalar dark matter with mass at or below the eV scale and pressure from repulsive self-interaction could form a Bose-Einstein condensate in the early Universe and maybe in galaxies asExpand
Constraining the mass of dark photons and axion-like particles through black-hole superradiance
Ultralight bosons and axion-like particles appear naturally in different scenarios and could solve some long-standing puzzles. Their detection is challenging, and all direct methods hinge on unknownExpand
Exploring the String Axiverse with Precision Black Hole Physics
It has recently been suggested that the presence of a plenitude of light axions, an Axiverse, is evidence for the extra dimensions of string theory. We discuss the observational consequences of theseExpand
New Observables for Direct Detection of Axion Dark Matter
We propose new signals for the direct detection of ultralight dark matter such as the axion. Axion or axionlike particle dark matter may be thought of as a background, classical field. We considerExpand
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