期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2010/05/007
关键词
modified gravity; dark matter theory; dark energy theory
资金
- World Premier International Research Center Initiative (WPI Initiative) [21740177, 17740134, 19GS0219, 21111006, 21540278]
- MEXT of Japan
We revisit ghost dark matter, the possibility that ghost condensation may serve as an alternative to dark matter. In particular, we investigate the Friedmann-Robertson-Walker (FRW) background evolution and the large-scale structure (LSS) in the Lambda GDM universe, i.e. a late-time universe dominated by a cosmological constant and ghost dark matter. The FRW background of the Lambda GDM universe is indistinguishable from that of the standard Lambda CDM universe if M greater than or similar to 1 eV, where M is the scale of spontaneous Lorentz breaking. From the LSS we find a stronger bound: M greater than or similar to 10 eV. For smaller M, ghost dark matter would have non-negligible sound speed after the matter-radiation equality, and thus the matter power spectrum would significantly differ from observation. These bounds are compatible with the phenomenological upper bound M less than or similar to 100 GeV known in the literature.
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