On 2/22/2019 6:04 PM, [email protected] wrote:
On Friday, February 22, 2019 at 4:55:41 PM UTC-7, Brent wrote: On 2/22/2019 2:40 PM, [email protected] <javascript:> wrote:Gravitons, as quanta of the metric field, are already relativistic particles and covariant. *I thought it's the equations of motion for the particular force, not the mediating particles, that must be covariant. On a related topic for this thread, where does GR depart from Mach's principle? That is, what did Einstein implicitly (or explicitly) deny about Mach's principle? TIA, AG *Einstein thought he would develop a theory that satisfied Mach's principle, but as it turned out GR doesn't. For example the metric of spacetime is a dynamic field and transmit momentum and energy, as shown by LIGO. Mach's idea of spacetime as purely a relation between material events couldn't do that. Brent*Were you inferring covariance simply because the mediating particle for gravity, the graviton, travels at the SoL? *
GR is a covariant theory. So it's quanta, gravitons, are covariant.
*I thought it's the equations of motion for the particular force, not the mediating particles, that must be covariant. Do we have equations of motions for strong and weak forces, which are covariant? AG*
Forces are mediated by exchange of bosons. Those bosons appear in the Standard Model Lagrangian, from which equations of motion can be derived.
https://en.wikipedia.org/wiki/Mathematical_formulation_of_the_Standard_Model Brent -- 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.
