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Title: Clockwork axions in cosmology. Is chromonatural inflation chrononatural?

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [3]
  1. Harvard Univ., Cambridge, MA (United States); DOE/OSTI
  2. Brown Univ., Providence, RI (United States)
  3. Harvard Univ., Cambridge, MA (United States)

Many cosmological models rely on large couplings of axions to gauge fields. Examples include theories of magnetogenesis, inflation on a steep potential, chiral gravitational waves, and chromonatural inflation. Such theories require a mismatch between the axion field range and the mass scale appearing in the aFF~ coupling. This mismatch suggests an underlying monodromy, with the axion winding around its fundamental period a large number of times. We investigate the extent to which this integer can be explained as a product of smaller integers in a UV completion: in the parlance of our times, can the theory be “clockworked”? We argue that a clockwork construction producing a potential μ4cos(ajFa) for an axion of fundamental period Fa will obey the constraint μ < Fa. For a some applications, including chromonatural inflation with sub-Planckian field range, this constraint obstructs a clockwork UV completion. Alternative routes to a large coupling include fields of large charge (an approach limited by strong coupling) or kinetic mixing (requiring a lighter axion). Our results suggest that completions of axion cosmologies that explain the large parameter in the theory potentially alter the phenomenological predictions of the model.

Research Organization:
Brown Univ., Providence, RI (United States); Harvard Univ., Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0010010; SC0013607
OSTI ID:
1611333
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 10 Vol. 2018; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English

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The Swampland: Introduction and Review journal April 2019
Audible axions journal January 2019
Axion-like relics: new constraints from old comagnetometer data journal January 2020
Eternal inflation and swampland conjectures journal January 2019
Warm inflation as a way out of the swampland journal March 2019
Dark photon dark matter produced by axion oscillations journal April 2019
Warm inflation as a way out of the swampland text January 2018
The Swampland: Introduction and Review text January 2019