Editing Immirzi parameter (section)

{{Short description|Numerical coefficient in loop quantum gravity}}
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]].<ref name="rovelli">{{cite book|last=Rovelli|first=Carlo|title=Quantum Gravity|url=http://www.cpt.univ-mrs.fr/~rovelli/book.pdf|access-date=2010-09-25|series=Cambridge Monographs on Mathematical Physics|date=2004|publisher=[[Cambridge University Press]]|location=Cambridge, UK|isbn=978-0-521-83733-0 }}</ref> 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.