On Thursday, February 21, 2019 at 7:27:27 AM UTC-6, [email protected]
wrote:
>
>
> *Other than gravity, the remaining known forces are moderated, or shall we
> say "caused by" particles. Doesn't GR remain an exception; that is,
> wouldn't it preclude the existence of a graviton? TIA, AG*
>
Just my opinion: There are at least two possibilities for gravity people
are considering.
1. Gravity is "mediated" by particles: *gravitons*. Here, all particles
(including gravitons) "move" in a conventional spacetime background.
2. Space (or spacetime) *itself* is composed in some way as a collection of
"particles" ("cells", "tiles", ...). This is the approach of LQG and CDT.
There is no background "space" that things move in anymore in the
conventional sense: just a bunch of *spacicles* and particles interacting.
There could be others of course (e.g. HOPE - Histories of Phenomenally
Everything, ...).
- pt
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