Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.170b&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
Recent evidence suggests that the expansion of the universe may be accelerating. If true this suggests that the dominant form of matter in the universe has negative pressure. Although a perfect fluid with negative pressure would be unstable on short wavelengths, a new type of dark matter with nonvanishing, nondissipative resistance against pure shear (i.e., a solid) would be stable. Such solid dark matter could arise from a frustrated network of non-Abelian cosmic strings or domain walls and would evade most determinations of Omega _0. We present a long wavelength, effective description of such a component and compute the predicted CMB anisotropy.
Bucher Martin
Spergel David N.
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