Stability condition for AdS background (when gravity coupled to matter fields)

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Stability condition for AdS background (when gravity coupled to matter fields)

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In finding the stability condition for AdS background (when gravity coupled to matter fields), why the conserved energy should be positive?

This post imported from StackExchange Physics at 2014-06-29 09:39 (UCT), posted by SE-user user44609

asked Jun 28, 2014 in Theoretical Physics by user44609 (15 points) [ no revision ]

It would be helpful to know what source you're reading from, because at first glance the answer seems to be "obviously", which it is probably not.

commented Jul 1, 2014 by dimension10 (1,985 points) [ no revision ]

So can you write an answer?

commented Jul 1, 2014 by Dilaton (6,240 points) [ no revision ]

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