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How do you measure numerically the central charge of a system?

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Let's say that you are doing some Monte-Carlo simulations of a statistical system on a lattice and you observe scale invariance, meaning that you are at a conformal point. Can you get a numerical appreciation of the central charge?

I know how the central charge is related on the free energy (on a cylinder for example) or to the stress-energy tensor but these are not direct observable in a Monte-Carlo.

Is there a systematic method for that? Has it already been done?

This post imported from StackExchange Physics at 2014-09-05 08:25 (UCT), posted by SE-user Learning is a mess

asked Aug 20, 2014 in Theoretical Physics by Learning is a mess (75 points) [ no revision ]

Are you by any chance working in (1+1) dimensions?

This post imported from StackExchange Physics at 2014-09-05 08:25 (UCT), posted by SE-user fqq

commented Sep 4, 2014 by fqq (0 points) [ no revision ]

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