期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2013/01/036
关键词
physics of the early universe; dark energy theory; quantum gravity phenomenology
资金
- National Science Foundation [PHY-0855447]
- [AGAUR 2009-SGR-168]
- [MEC FPA 2007-66665-C02]
- [MEC FPA 2010-20807-C0-202]
- [CPAN CSD2007-00042]
We argue that theories with ghosts may have a long lived vacuum state even if all interactions are Lorentz preserving. In space-time dimension D = 2, we consider the tree level decay rate of the vacuum into ghosts and ordinary particles mediated by non-derivative interactions, showing that this is finite and logarithmically growing in time. For D > 2, the decay rate is divergent unless we assume that the interaction between ordinary matter and the ghost sector is soft in the UV, so that it can be described in terms of non-local form factors rather than point-like vertices. We provide an example of a nonlocal gravitational-strength interaction between the two sectors, which appears to satisfy all observational constraints.
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