Modified gravity or modified matter ?

Details Modified gravity or modified matter ? Modified gravity or modified matter ?

2009-02-10

arxiv.org/abs/0902.1712v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, to appear in l'Astronomie (in French)

Scientific paper

To the astrophysicist faced with the puzzle of dark matter, this one appears under two different aspects: on the one hand in cosmology, i.e. at very large scales, where it seems to be made of a bath of particles; on the other hand at the scale of galaxies, where it is described by a set of specific phenomena, looking incompatible with a description in terms of particles, and suggesting that we are seeing a modification of the law of gravity. Reconciling these two distinct aspects of dark matter in a single theoretical formalism is an important challenge which could lead to some new physics in action at astronomical scales.

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