23
Jan 10

Neutralino dark matter stars can not exist

Source: arXiv

Dark matter "clumping" together over time confirming  theories
of how structure formed in our evolving universe.
Credit: NASA, ESA, CalTech

Recent observational data gives an indication that the universe contains a significant fraction (22%) of dark matter whose origin is still unclear. A possible solution to this problem comes from supersymmetric (SUSY) models in the form of neutralino. Neutralino is the lightest supersymmetric partner in SUSY, with the mass of about 100GeV, and is stable. It interacts with the gravitational and weak interactions only, which indicates that it is ”dark”. Weak interactions and neutralino mass are sufficient to satisfy the relic density needed to explain the observed portion of the dark matter in the universe.

Recently a group of astronomers has obtained a detailed distribution of dark matter as a function of the redshift in a part of our universe. Their observations indicate that dark matter plays a role of a scaffolding upon which ordinary matter builds structures. However, the observations show that large pockets with only dark matter (and no ordinary matter) also exist.

De-Chang Dai and Dejan Stojkovic of HEPCOS, Department of Physics, SUNY at Buffalo, have researched the question that arises from the existence of these large pockets of dark matter that is whether compact objects like planets, stars or maybe even large may or not exist.
They concluded that, a stable neutralino star can not exist and also estimated that a stable star can not contain more than a few percents of neutralinos. This information has been published in  the Journal of High Energy Physics (JHEP)(read more)

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