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Pardon the wild question, but

Are there any known connections between Kazhdan's property (T) and number theory, or number theoretic consequences of property (T)?

Edit: To clarify, I'd like to know if there are consequences of property (T) in modern number theory that are significant to number theorists, and in what way are they significant (I'm not a number theorist, and so mostly am looking for enrichment on how thing fit together!)

Thanks, in advance, for any thoughts or references!

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    Inasmuch as Kazhdan's property is related to expander graphs, a connection with number theory is given via Ramanujan graphs and cryptography.2012-08-18

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