Immirzi parameter

The Immirzi parameter (also known as the Barbero–Immirzi parameter) is a numerical coefficient appearing in loop quantum gravity (LQG), a nonperturbative theory of quantum gravity. The Immirzi parameter measures the size of the quantum of area in Planck units.^[1] As a result, its value is currently fixed by matching the semiclassical black hole entropy, as calculated by Stephen Hawking, and the counting of microstates in loop quantum gravity.

^ Rovelli, Carlo (2004). Quantum Gravity (PDF). Cambridge Monographs on Mathematical Physics. Cambridge, UK: Cambridge University Press. ISBN 978-0-521-83733-0. Retrieved 2010-09-25.

[rovelli-1] Rovelli, Carlo (2004). Quantum Gravity (PDF). Cambridge Monographs on Mathematical Physics. Cambridge, UK: Cambridge University Press. ISBN 978-0-521-83733-0. Retrieved 2010-09-25.

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