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DOE OSTI · 22272871

Ghost dark matter

Furukawa, Tomonori·Yokoyama, Shuichiro·Ichiki, Kiyotomo·Sugiyama, Naoshi·Mukohyama, Shinji
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Abstract

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 ΛGDM universe, i.e. a late-time universe dominated by a cosmological constant and ghost dark matter. The FRW background of the ΛGDM universe is indistinguishable from that of the standard ΛCDM universe if M∼>1eV, where M is the scale of spontaneous Lorentz breaking. From the LSS we find a stronger bound: M∼>10eV. 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∼<100GeV known in the literature.

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79 ASTRONOMY AND ASTROPHYSICSASTROPHYSICSCOSMOLOGICAL CONSTANTCOSMOLOGYNONLUMINOUS MATTERSOUND WAVESUNIVERSE

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Furukawa, Tomonori, Yokoyama, Shuichiro, Ichiki, Kiyotomo, Sugiyama, Naoshi, Mukohyama, Shinji. 2010-05-01. Ghost dark matter. https://doi.org/10.1088/1475-7516%2F2010%2F05%2F007

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