Dark Energy, QCD Axion, and Trans-Planckian-Inflaton Decay Constant
Pseudoscalars appear frequently in particle spectra. They can be light if they appear as pseudo-Goldstone bosons from some spontaneously broken global symmetries with the decay constant f. Since any global symmetry is broken at least by quantum gravitational effects, all pseudoscalars are massive. T...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-09-01
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| Series: | Universe |
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| Online Access: | https://www.mdpi.com/2218-1997/3/4/68 |