期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 8, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2018/08/024
关键词
dark energy theory; modified gravity
资金
- Center for Particle Cosmology by the University of Pennsylvania
- NSF CAREER Award [PHY-1145525]
- US Department of Energy (HEP) Award [DE-SC0017804]
- NASA ATP grant [NNX11AI95G]
- Charles E. Kaufman Foundation of the Pittsburgh Foundation
- W.M. Keck Foundation Science and Engineering Grant
- U.S. Department of Energy (DOE) [DE-SC0017804] Funding Source: U.S. Department of Energy (DOE)
We introduce a novel method to circumvent Weinberg's no-go theorem for self-tuning the cosmological vacuum energy: a finite-temperature superfluid can counter the effects of an arbitrarily large cosmological constant. Fluctuations of the superfluid result in the graviton acquiring a Lorentz-violating mass and we identify a unique class of theories that are pathology free, phenomenologically viable, and do not suffer from instantaneous modes. This new and hitherto unidentified phase of massive gravity propagates the same degrees of freedom as general relativity with an additional Lorentz-violating scalar that is introduced by higher-derivative operators in a UV insensitive manner. The superfluid is therefore a consistent infrared modification of gravity. We demonstrate how the superfluid can degravitate a cosmological constant and discuss its phenomenology.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据