The bright side of dark matter

Details The bright side of dark matter The bright side of dark matter

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..493..208e&link_type=abstract

Eighth Canadian conference on general relativity and relativistic astrophysics. AIP Conference Proceedings, Volume 493, pp. 208

Astronomy and Astrophysics

Astrophysics

Dark Matter, Relativity And Gravitation

Scientific paper

We show that it is not possible in the absence of dark matter to construct a four-dimensional metric that explains galactic observations. In particular, by working with an effective potential it is shown that a metric which is constructed to fit flat rotation curves in spiral galaxies leads to the wrong sign for the bending of light i.e. repulsion instead of attraction. Hence, without dark matter the motion of particles on galactic scales cannot be explained in terms of geodesic motion on a four-dimensional metric. This reveals a new bright side to dark matter: it is indispensable if we wish to retain the cherished equivalence principle.

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