The **Immirzi parameter** (also known as the **Barbero-Immirzi parameter**) is a numerical coefficient appearing in loop quantum gravity, a nonperturbative theory of quantum gravity. The Immirzi parameter measures the size of the quantum of area in Planck units. 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.

Read more about Immirzi Parameter: The Reality Conditions, Black Hole Thermodynamics, Immirzi Parameter in Spin Foam Theory, Interpretation

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Loop Quantum Gravity - Key Concepts - Black Hole Entropy

... The problem is that a crucial free

... The problem is that a crucial free

**parameter**in the theory, known as the**Immirzi parameter**, can only be computed by demanding agreement with Bekenstein and Hawking's calculation of ... event horizon, but does not obtain the Bekenstein-Hawking formula S = A/4 unless the**Immirzi parameter**is chosen to give this value ... of the entropy of all non singular black holes directly from theory and independent of**Immirzi parameter**...**Immirzi Parameter**- Interpretation

... The

**parameter**may be viewed as a renormalization of Newton's constant ... Various speculative proposals to explain this

**parameter**have been suggested for example, an argument due to Olaf Dreyer based on quasinormal modes ... of Newton's force at long distance) were found requiring a different value of the

**Immirzi parameter**, it would constitute evidence that loop quantum gravity cannot reproduce the physics of general ...

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