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SQUIDs - Low Temperature Laboratory

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Cold Dark Matter<br />

• Recent cosmic microwave background measurements indicate that<br />

~25% of the mass of the universe is cold dark matter (CDM).<br />

• A candidate particle is the axion, proposed in 1978 to explain the<br />

absence of a measurable neutron electric dipole moment.<br />

• The axion is predicted to be a very light particle with no charge or spin.

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