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Is the effect of the Sun's gravitational potential on dark matter particles observable?
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Stockholms universitet, Naturvetenskapliga fakulteten, Oskar Klein-centrum för kosmopartikelfysik (OKC).
2014 (Engelska)Ingår i: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, nr 8, s. 013-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We consider the effect of the Sun's gravitational potential on the local phase space distribution of dark matter particles, focusing on its implication for the annual modulation signal in direct detection experiments. We perform a fit to the modulation signal observed in DAMA/LIBRA and show that the allowed region shrinks if Solar gravitational focusing (GF) is included compared to the one without GF. Furthermore, we consider a possible signal in a generic future direct detection experiment, irrespective of the DAMA/LIBRA signal. Even for scattering cross sections close to the current bound and a large exposure of a xenon target with 270 ton yr it will be hard to establish the presence of GF from data. In the region of dark matter masses below 40 GeV an annual modulation signal can be established for our assumed experimental setup, however GF is negligible for low masses. In the high mass region, where GF is more important, the significance of annual modulation itself is very low. We obtain similar results for lighter targets such as Ge and Ar. We comment also on inelastic scattering, noting that GF becomes somewhat more important for exothermic scattering compared to the elastic case.

Ort, förlag, år, upplaga, sidor
2014. nr 8, s. 013-
Nyckelord [en]
dark matter theory, dark matter experiments
Nationell ämneskategori
Astronomi, astrofysik och kosmologi
Identifikatorer
URN: urn:nbn:se:su:diva-108359DOI: 10.1088/1475-7516/2014/08/013ISI: 000341848800013OAI: oai:DiVA.org:su-108359DiVA, id: diva2:757473
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AuthorCount:2;

Tillgänglig från: 2014-10-22 Skapad: 2014-10-22 Senast uppdaterad: 2017-12-05Bibliografiskt granskad

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Av författaren/redaktören
Schwetz, Thomas
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FysikumOskar Klein-centrum för kosmopartikelfysik (OKC)
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Journal of Cosmology and Astroparticle Physics
Astronomi, astrofysik och kosmologi

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