Talk:Quantum gravity/Archive for 2016

Causal Fermionic Systems
"Causal fermionic systems" refers to a theory essentially known only by one "F. Finster". It probably shouldn't even be mentioned in the "other approaches" list, and certainly not beside string theory and LQG. The detail that the theory "gives general relativity and quantum field theory as limiting cases" is also superfluous given that no such details are given for any other theory. (198.84.200.2 (talk) 07:18, 24 February 2016 (UTC))

Assessment comment
Substituted at 03:37, 30 April 2016 (UTC)

About quantum gravity
In an article you need to add the following point. The main role in the quantum theory of gravity will play the uncertainty relation $$\Delta r_s\Delta r\ge\ell^2_{P}$$, where $$r_s$$ is Schwarzschild radius, $$r$$ is radial coordinate, $$\ell_{P}$$ is the Planck length, which is another form of Heisenberg's uncertainty relation between the momentum and coordinate. In fact, this ratio can be written in the form $$\Delta (2GM/c^2)\Delta r\ge G\hbar /c^3$$, where $$G$$ is the gravitational constant, $$M$$ is mass, $$c$$ is the speed of light, $$\hbar$$ is Dirac's constant, or what is the same, the Heisenberg's uncertainty relation $$\Delta (M c) \Delta r\ge\hbar/2$$. This uncertainty relation predicts the emergence of virtual black holes at the Planck scale. It indicates that the photon velocity fluctuations depend on the square of the Planck length $$\ell^2_{P}$$, but not the Planck length $$\ell_{P}$$. These fluctuations is immeasurably small. Therefore, images of distant stars should be visible without distortion on intergalactic distances. At the same time the emergence of virtual black holes (quantum foam, which is the basis for "fabric" of the Universe) is energetically most favorable in three-dimensional space. This gave rise, most likely, to the three-dimensionality of the observed space. See more here in the proofs. 178.120.22.229 (talk) 08:10, 10 December 2016 (UTC)