3 research outputs found
Direct probes of Dark Matter in the cluster 1ES0657-556 through microwave observations
The cluster 1ES0657-556 is an ideal astrophysical laboratory to study the
distribution and the nature of Dark Matter because this last component is
spatially separated from the intracluster gas. We show that microwave
observations can provide crucial probes of Dark Matter in this system. We
calculate the expected SZ effect from Dark Matter annihilation in the main mass
concentrations of the cluster 1ES0657-556, and we estimate the sources of
contamination, confusion and bias to asses its significance. We find that SZ
observations at a frequency of 223 GHz can resolve both spatially and
spectrally the SZ_DM signal and isolate it from the other SZ signals, and
mainly from the thermal SZ effect which is null at frequencies 220-223 GHz for
the case of 1ES0657-556. We conclude that SZ observations with sub-arcmin
resolution and micro-K sensitivity of 1ES0657-556 are crucial, and maybe
unique, to find direct astrophysical probes of the existence and of the nature
of Dark Matter, or to set strong experimental limits.Comment: 5 pages, 2 figures, A&A Letters in pres
Dark Matter Candidates: A Ten-Point Test
An extraordinarily rich zoo of non-baryonic Dark Matter candidates has been
proposed over the last three decades. Here we present a 10-point test that a
new particle has to pass, in order to be considered a viable DM candidate: I.)
Does it match the appropriate relic density? II.) Is it {\it cold}? III.) Is it
neutral? IV.) Is it consistent with BBN? V.) Does it leave stellar evolution
unchanged? VI.) Is it compatible with constraints on self-interactions? VII.)
Is it consistent with {\it direct} DM searches? VIII.) Is it compatible with
gamma-ray constraints? IX.) Is it compatible with other astrophysical bounds?
X.) Can it be probed experimentally?Comment: 29 pages, 12 figure