# Questions tagged [quantum-gravity]

Any of the various explanations of gravity as a quantum theory, including string theory and loop quantum gravity.

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### Gravitational Waves and Quantum Gravity

Since we can now directly observe gravitational wave signals, can any type of future experiment be set up that might manifest the quantum nature of gravity? For example, perhaps a version of LIGO ...
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### Would a quantum theory of gravity necessarily violate relativity? (quantisation of speed of light?) [closed]

The way I understand Quantum Mechanics, observables are "promoted" to operators. Relativity (General and Special) are defined around the constancy of speed of light $c$. This is the speed of ...
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### Boundary conditions for bulk partition function in AdS/CFT

In AdS/CFT, we are told that the bulk and boundary functions are equal: $$\tag{1}Z_{bulk}[J]= Z_{CFT}[J],$$ where on the left hand side of the equality, $J$ is interpreted as a boundary condition at ...
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### Can the stretched horizon be entangled with an external qubit even if the qubit is unentangled with the black hole?

Suppose at time $t_0$, we have a black hole unentangled with an external mass and an external qubit $\left( |0\rangle+|1\rangle \right)/\sqrt 2$. We then perform a controlled gate operation on the ...
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### What is common between gravitons and Higgs bozon? [duplicate]

The General Relativity started from the consideration of Einstein that the heavy mass (due to gravitational field and inertial mass (Higgs field) are locally equivalent. What is the connection between ...
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### Wouldn't a simple scalar field fix the non-renormalizability of gravity?

It is well known that quadratic gravity is renormalizable. On the other hand it is possible to transform the partition function of Einstein-Hilbert + free minimally coupled complex scalar field into a ...
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