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Cosmic clues for dark matter and their implications for a dark matter asymmetry

Kathryn Zurek, University of Michigan
Wednesday, January 4, 2012 - 4:00pm to 5:00pm
102 TBA

The nature of dark matter is one of the most important
outstanding problems in physics and cosmology. From observing astrophysical
objects, we have learned that dark matter represents some 25% of the total
energy of the universe, while ordinary matter weighs in at only about 4%.
Although they make up a large fraction of the energy of the universe, dark
matter particles interact with ordinary matter only very weakly, making their
detection via interactions with ordinary matter difficult. We examine some of
the constraints and cosmic clues for the nature of the dark matter, and
consider some of the recent possible signals for its direct detection. These
clues and constraints provide the basis for examining in greater detail a
previously little explored class of models, where the dark matter carries a
conserved global charge analogous to baryon number. We discuss a few explicit
models, and examine their implications, including a few technical aspects of
the evolution of the dark matter density and their connections to astrophysical
objects such as neutron stars.

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