期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 1, 页码 -出版社
SPRINGER
DOI: 10.1088/1126-6708/2007/01/036
关键词
cosmology of theories beyond the SM; classical theories of gravity
资金
- STFC [PP/D003970/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/D003970/1] Funding Source: researchfish
We investigate the universal low-energy dynamics of the simplest Higgs phase for gravity, 'ghost condensation.' We show that the nonlinear dynamics of the 'ghostone' field dominate for all interesting gravitational sources. Away from caustic singularities, the dynamics is equivalent to the irrotational flow of a perfect fluid with equation of state p alpha rho(2), where the fluid particles can have negative mass. We argue that this theory is free from catastrophic instabilities due to growing modes, even though the null energy condition is violated. Numerical simulations show that solutions generally have singularities in which negative energy regions shrink to zero size. We exhibit partial UV completions of the theory in which these singularities are smoothly resolved, so this does not signal any inconsistency in the effective theory. We also consider the bounds on the symmetry breaking scale M in this theory. We argue that the nonlinear dynamics cuts off the Jeans instability of the linear theory, and allows M less than or similar to 100 GeV.
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