## Immirzi Parameter

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.

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### Some articles on 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 ... 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 ...

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 the black hole entropy ... but does not obtain the Bekenstein-Hawking formula S = A/4 unless the**Immirzi parameter**is chosen to give this value ... of all non singular black holes directly from theory and independent of**Immirzi parameter**...Main Site Subjects

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