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For this to happen in gravity you need first to define gravity as a gauge theory: this is done classically via the use of Ashtekar variables. … Next you need a vacuum state of this theory and something to break the gauge symmetry of this vacuum: lacking a complete theory of quantum gravity, this part is yet unknown so a "gravitational superconductor …

Your object will never reach the speed of light, but instead it will approach it asymptotically since every time it passes through the portal, it will need more and energy to gain (less and less) spee …

A general formula doesn't exist, you need to calculate it (or evaluate it numerically) yourself depending in the specific parameters of your system. To evaluate it you first need to solve the Einstein …

Studying the ADM formulation of General Relativity the ADM splitting comes out from the assumption that the spacetime is globally hyperbolic. From that assumption thanks to Geroch's theorem, it is pro …

I didn't understand your thought experiment, otherwise yes, radiation has a gravitational pull. Is it possible that objects that possess immense electromagnetic radiation, for example, will follow wi …

I'm working with gravitational collapse models, in particular with the Oppenheimer-Snyder model. Short list of the assumptions for those unfamiliar with the model, you have a spherical symmetric press …

It is well known that in the canonical quantization program for quantum gravity, like LQG/Wheeler-De Witt/Polymer QM, almost every prescription when applied to cosmology/gravitational collapse leads to …

False, rotation has nothing to do with the fact that you see points of different names. The sphere, uniform still has angular momentum which is measurable. Intuitively, polish perfectly an aluminium …

I know up to some degree how spinfoam models and LQG work, but there are some details that i still miss since i have still a naif knowledge. In the literature it as often said that an open problem is …