Why Do We Expect WIMPs to Be Distributed Throughout Galactic

question 16

Multiple Choice

Why do we expect WIMPs to be distributed throughout galactic halos,rather than settled into a disk?

• A)They are light enough that they have expanded out into the halo.
• B)WIMPs were produced at the early stages of galaxy evolution,and objects in the halo,such as globular clusters,were formed at the beginning of the galaxy.
• C)Since they do not interact with the electromagnetic force,they do not feel friction or drag and hence do not contract with the rest of the protogalactic cloud.
• D)Shock waves from supernovae have blown the WIMPs out into the halo.
• E)Jets from the early active stage of a galaxy's life shot out most of the WIMPs from the disk.

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Definitions:

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