id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_6p2xdaetarh6boxvadz5atzsnu	Jihn E. Kim	Dark energy, QCD axion, BICEP2, and trans-Planckian decay constant	2016	6	.pdf	application/pdf	4339	677	85	Dark energy, QCD axion, BICEP2, and trans-Planckian decay constant � Dark energy, QCD axion, BICEP2, and trans-Planckian decay constant � Keywords: Discrete symmetry, QCD axion, Dark energy, Inflation For pseudo-Goldstone bosons like axion, we introduce global symmetries. So, we will consider discrete gauge symmetries allowed in string compactification. It is known that string axions from BMN have GUT scale decay constants [16]; hence the QCD axion from string To shrink the field energy much lower than M4P, a natural inflation (mimicking the axion-type − cos potential) has been introduced [23]. M4GUT, the natural inflation with a GUT scale confining force has been introduced [23]. The hilltop potential of Fig. 3 is a Mexican hat potential of U(1)de, i.e. obtained from some discrete symmetry, allowed in string compactification [12]. The hilltop inflation is basically a consequence of discrete symmetries [5, 12, 13] , allowed in string compactification.	./cache/work_6p2xdaetarh6boxvadz5atzsnu.pdf	./txt/work_6p2xdaetarh6boxvadz5atzsnu.txt