Dark Energy from Interacting Dark Fermions

Details Dark Energy from Interacting Dark Fermions Dark Energy from Interacting Dark Fermions

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aps..dnp.fe008g&link_type=abstract

American Physical Society, 2010 Fall Meeting of the APS Division of Nuclear Physics, November 2-6, 2010, abstract #FE.008

Physics

Nuclear Physics

Scientific paper

Physics is rife with interacting systems that exhibit negative pressure: atomic nuclei are very well known examples. We examine the range of parameters, for neutral fermions interacting only by exchange of an extraordinarily light scalar particle, that produce a negative pressure on the scale of the Universe over time periods where Dark Energy is or may be relevant. Of known or expected neutral Majorana fermions, active neutrinos can be ruled out but sterile neutrinos would work, as well as the LSP, to describe the recent observations of Dark Energy effects. After a phase change required by the instability responsible for the negative pressure, the resulting clouds of neutral fermions will contribute to Dark Matter. Nothing requires that this can only happen once.

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