I Discussing General Relativity - Beliefs & Ideas

[Jamestein Newton]

Following are not strictly physics questions. But cool questions to discuss.
We need to add dark energy to our cosmological model if we strictly follow GR. This lead to some beliefs that GR is an effective theory.

(1)Do you believe that GR is the fundamental theory? If GR is an effective theory on some senses, what kind of fundamental physics can we take away from GR at the end?
(2)Do you think the gravitation would still be equivalent to the curvature of spacetime eventually? If not, what are the possible modifications? I am interested in the alternative description of gravitation that even only differ a bit from the current equivalent to the curvature of spacetime
(3)Do you think we need will modification on GR under the large scale?
(4)What will the main consequences of any possible modifications, and what will they lead to?

Just an informal chat. I am just curious about how people perceive GR nowadays.

 

[PeterDonis]

Following are not strictly physics questions.

Indeed. Which means they are off topic here.

If you want to discuss particular proposals for theories that go beyond GR and have GR as an effective theory in a particular domain, those types of discussions would normally be in the Beyond the Standard Model forum and would be based on a particular valid reference (a published peer-reviewed paper that describes the proposed theory you want to discuss).

Some GR textbooks (such as MTW and Wald) also have discussions of how we might possibly go beyond GR. A PF discussion could also be based on what is said in those textbooks if you have questions about it.

In the meantime, this thread is closed.