Dark halo or bigravity?

Details Dark halo or bigravity? Dark halo or bigravity?

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epjst.163..291r&link_type=abstract

The European Physical Journal Special Topics, Volume 163, Issue 1, pp.291-296

Physics

1

Scientific paper

Observations show that about the 20% of the Universe iscomposed by invisible (dark) matter (DM), for which manycandidates have been proposed. In particular, the anomalousbehavior of rotational curves of galaxies (i.e. theflattening at large distance instead of the Keplerian fall)requires thatthis matter is distributed in an extended halo around the galaxy. In order to reproduce this matter density profiles in Newtonian gravity and in cold dark matter (CDM) paradigm (in which theDM particles are collisionless), many ad-hoc approximations are required.The flattening of rotational curves can be explained by asuitable modification of gravitational force in bigravity theories, together with mirror matter model that predicts the existenceof a dark sector in which DM has the same physical properties of visible matter.As an additional result, the Newton constant is different at distances much less and much greater than 20 kpc.

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