# Tag Info

## Hot answers tagged quantum-gravity

4

The theory was put forward that semiclassical gravity (a classical gravitational field generated by quantum matter) was indeed the correct theory, something of the form $G_{ab} = \langle T_{ab}\rangle$ With $G$ the Einstein tensor and $\langle T\rangle$ the expectation value of the stress energy tensor of the matter. It's a theory that works fine enough, ...

3

The short answer is that it can, if $M = 1 = M^{-1}$. In this way of looking at it, all quantities in Planck units are pure numbers. The longer answer is that there are two different ways of thinking about natural unit systems. Natural unit systems in terms of standard units One of them, and perhaps the easier one to understand, is that you're still ...

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One may have many science fiction or fantasy projections of how physics might be. In the real world physics and physicists use mathematical theories as tools to model experimental observations. Two landmarks guide the modelling of data at present . 1) The validation of Quantum Mechanics as the underlying framework that describes with great accuracy the ...

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Following the link on Mitchell Porter comment, I found that there are at least 2 research branches followed by physicists (or maybe one is a generalization of the other) that deals with gravity as an emergent force from the interaction of the particles, and not a fundamental force itself: Induced Gravity Entropic Gravity From both Wikipedia's articles ...

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