2 votes

Conceptually, why is the entropy of black hole related to Planck length?

In classical general relativity there is no deep explanation, since we don't consider quantum mechanics. The appearance of the Planck length is due to the Geometrized unit system commonly used in ...
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2 votes

Imaginary part of IR divergence in gravitational S-matrix

I will try to give you some guidelines that will (hopefully) help you understand some key differences between Weinberg's work and the authors' in the article you cite (despite not having a complete ...
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  • 2,119
1 vote

When connections are fundamental objects, is LQG the only possible theory?

What he's probably referring to is called the LOST theorem: There's only one cyclic representation of the holonomy-flux algebra that has a diffeomorphism-invariant cyclic vector (the Ashtekar-...
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