A Fundamental Test of the Nature of Dark Matter

Details A Fundamental Test of the Nature of Dark Matter A Fundamental Test of the Nature of Dark Matter

1999-01-26

arxiv.org/abs/astro-ph/9901358v2

Astrophys.J. 519 (1999) L1-4

Astronomy and Astrophysics

Astrophysics

8 pages, 2 figures, AASTeX, replaced to conform to the version to be published in ApJL. It is now more clearly written and add

Scientific paper

Dark matter may consist of weakly interacting elementary particles or of macroscopic compact objects. We show that the statistics of the gravitational lensing of high redshift supernovae strongly discriminate between these two classes of dark matter candidates. We develop a method of calculating the magnification distribution of supernovae, which can be interpreted in terms of the properties of the lensing objects. With simulated data we show that >~ 50 well measured type Ia supernovae (\Delta m ~ 0.2 mag) at redshifts ~1 can clearly distinguish macroscopic from microscopic dark matter if $\Omega_o \simgt 0.2$ and all dark matter is in one form or the other.

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