All physical laws have to be Lorentz invariant according to a lecture I just watched. Why is general covariance (which is more general than Lorentz invariance) not a requirement for all laws of physics? Are there any quantum gravity theories that take the approach of adding general covariance to...
It happens to be a topic in the frontiers of physics (Quantum Gravity). Nima Arkani speaks of it very often. He says that space and time cannot be fundamental because when you invoke QM the whole concept falls apart and can only be an approximation of a deeper concept. Has nothing to with philosophy
What feature of the equations of classical physics show that space and time are fundamental and how would the equations differ if space and time were not fundamental but emergent? I heard all of this from a previous talk and I would appreciate any help and any further reading recommendations.
There seems to be a similarity between the solutions of laplace's equation and the principle of least action. e.g. the solution of a one dimensional laplace equation is a straight and the curve that minimizes the action is also a straight line. Was one derived from the other? Newbie here. Id...
Hey thanks for your response. If t=t'=0, why is it that when I use the lorentz transformation to find t' I do not get t'=0. This is what is confusing me. Thanks
Hey guys. Noob here.
Question;
S frame = x,y,z,t
S' frame = x',y',z',t'
S' is moving with a speed v relative to S and t=t'=0 when origins coincide
v= 0.6c
find the coordinates of x = 4 & t = 0 in S'
When I use lorentz transformation, I get a negative t' and x' = 5. This doesn't make sense to...