# Tag Info

## New answers tagged quantum-gravity

1

Associating a particle with a classical field is what quantization does, practically by definition. Take a classical field, make it an operator, and find the eigenstates of its Hamiltonian. The result is particle states, whatever form the field takes. "Graviton" is just the name we give those hypothetical particles. Even though it's basically just a ...

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 ...

0

It is like the interesting proposition in simulation hypothesis which paraphrased goes, if we could create a computer simulation to understand reality it would be the approximate size and age of the current entire universe.

1

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 ...

2

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 ...

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, ...

0

Your point #1 has to do with the fact that some physicists believe that if information did not RETURN, it would violate the Unitary principle. The philosophy of Quantum Mechanics demands that Unitary is immutable. Therefore some people had come up with theories to show that information is not really lost in the blackhole. I have not read the book you ...

Top 50 recent answers are included