Journal
PHYSICAL REVIEW D
Volume 83, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.83.061502
Keywords
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Funding
- NSF [PHY 07-57190]
- DOE [DE-FG02-164 92ER40701, DE-FG03-95ER40917]
- National Science Foundation of China [10425525, 10875103]
- National Basic Research Program of China [2010CB833000]
- Zhejiang University [2009QNA3015]
- TUBITAK [110T339]
- METU [BAP-07-02-2010-00-02]
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We study the parameter space of D-dimensional cosmological Einstein gravity together with quadratic curvature terms. In D < 4 there are in general two distinct (anti)-de Sitter vacua. We show that, for an appropriate choice of the parameters, there exists a critical point for one of the vacua, with only massless tensor, but neither massive tensor nor scalar, gravitons. At criticality, the linearized excitations have formally vanishing energy (as do black hole solutions). A further restriction of the parameters gives a one-parameter cosmological Einstein plus Weyl(2) model with a unique vacuum, whose Lambda is determined.
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