On Sunday, February 24, 2019 at 6:52:50 AM UTC-7, Philip Thrift wrote: > > > > On Saturday, February 23, 2019 at 6:04:15 PM UTC-6, [email protected] > wrote: >> >> >> >> On Saturday, February 23, 2019 at 6:53:09 AM UTC-7, Philip Thrift wrote: >>> >>> >>> >>> On Saturday, February 23, 2019 at 7:25:21 AM UTC-6, John Clark wrote: >>>> >>>> On Fri, Feb 22, 2019 at 11:08 PM <[email protected]> wrote: >>>> >>>> > *In GR, the paths are determined by geometry in the absence of >>>>> forces, not by mediating particles.* >>>> >>>> >>>> Yes, that's because General Relativity is a classical theory that is >>>> not quantized, it has so far passed every experimental test posed to it >>>> with flying colors but we know it can't be entirely correct because when >>>> we >>>> ask it what happens when things become very small and very massive, such >>>> as >>>> in the center of Black Holes, it gives the absurd answer of infinity. >>>> Neither Quantum Mechanics or General Relativity works when things get >>>> massive and small, perhaps quantizing General Relativity will fix this or >>>> maybe there is some other way to do so. Nobody knows. >>>> >>>> > *I could be mistaken, but I see gravitons as being part of a >>>>> distinct theory of gravity, which might give the same results as GR,* >>>> >>>> >>>> Nobody has ever experimentally detected a graviton and it's extremely >>>> unlikely anybody ever will, so if they make the same predictions as >>>> standard General Relativity there would be no point in introducing the >>>> idea. >>>> >>>> John K Clark >>>> >>>> >>> >>> If all experiments proposed to determine if gravity is quantized* fail* >>> >>> Such measurements, they say, could enable them to uncover the quantum >>> nature of gravity and determine whether or not gravity is quantized. >>> >>> >>> >>> https://physics.aps.org/synopsis-for/10.1103/PhysRevLett.122.071101 >>> >>> >>> that is: the search for a quantized gravity is a wild goose chase >>> >>> what do theorists do then? >>> >>> (I asked Hossenfelder. No answer.) >>> >>> - pt >>> >> >> *The article you cite indicates increasing hypothetical sensitivity for >> measuring gravity for tiny effects. If gravity can be quantized, what >> exactly would be quantized? Bruce says that gravity waves would involve >> gravitons under a quantized theory. Is that all? AG * >> > > > > > I suppose it needs to defined *what an experiment would be* that would > determine that gravity is quantized in a measurable way. > > Theories disconnected from experiments are mere math games. >
*A good theory gives pointers on what to measure and how. AG * > > - pt > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
