期刊
PHYSICAL REVIEW D
卷 89, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.89.044027
关键词
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资金
- NASA ATP Grant [NNX11AI95G]
- NSF CAREER Award [PHY-1145525]
- Kavli Institute for Cosmological Physics at the University of Chicago [NSF PHY-1125897]
- Robert R. McCormick Postdoctoral Fellowship
- Direct For Mathematical & Physical Scien
- Division Of Physics [1145525] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1001296, 1125897] Funding Source: National Science Foundation
We construct a theory that admits a time-dependent solution smoothly interpolating between a null energy condition (NEC)-satisfying phase at early times and a NEC-violating phase at late times. We first review earlier attempts to violate the NEC and an argument of Rubakov, presented in [V. A. Rubakov, Phys. Rev. D 88, 044015 (2013)], which forbids the existence of such interpolating solutions in a single-field dilation-invariant theory. We then construct a theory which, in addition to possessing a Poincare-invariant vacuum, does admit such a solution. For a wide range of parameters, perturbations around this solution are at all times stable, comfortably subluminal and weakly coupled. The theory requires us to explicitly break dilation invariance, so it is unlikely that the theory is fully stable under quantum corrections, but we argue that the existence of a healthy interpolating solution is quantum-mechanically robust.
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