Relaxion: A landscape without anthropics
- Univ. of Washington, Seattle, WA (United States). Dept. of Physics
The relaxion mechanism provides a potentially elegant solution to the hierarchy problem without resorting to anthropic or other fine-tuning arguments. This mechanism introduces an axion-like field, dubbed the relaxion, whose expectation value determines the electroweak hierarchy as well as the QCD strong -violating parameter. During an inflationary period, the Higgs mass squared is selected to be negative and hierarchically small in a theory which is consistent with ’t Hooft’s technical naturalness criteria. However, in the original model proposed by Graham, Kaplan, and Rajendran, the relaxion does not solve the strong problem, and in fact contributes to it, as the coupling of the relaxion to the Higgs field and the introduction of a linear potential for the relaxion produces large strong violation. Herein we resolve this tension by considering inflation with a Hubble scale which is above the QCD scale but below the weak scale, and estimating the Hubble temperature dependence of the axion mass. The relaxion potential is thus very different during inflation than it is today. We find that provided the inflationary Hubble scale is between the weak scale and about 3 GeV, the relaxion resolves the hierarchy, strong , and dark matter problems in a way that is technically natural.
- Research Organization:
- Univ. of Washington, Seattle, WA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
- Grant/Contract Number:
- SC0011637; PHY-1066293
- OSTI ID:
- 1595818
- Alternate ID(s):
- OSTI ID: 1414328
- Report Number(s):
- arXiv:1708.00010v2; PRVDAQ; TRN: US2101497
- Journal Information:
- Physical Review D, Vol. 96, Issue 11; ISSN 2470-0010
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Nelson-Barr relaxion
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journal | February 2019 |
Paper-boat relaxion
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journal | May 2019 |
Light Higgs boson from a pole attractor
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text | January 2018 |
Relaxion Dark Matter
|
text | January 2019 |
Relaxion dark matter
|
journal | September 2019 |
Light Higgs boson from a pole attractor
|
journal | July 2018 |
Relaxion Dark Matter | text | January 2018 |
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