The discussion centers on the Big Bang Theory, which posits that time began with the Big Bang, a concept often misunderstood as an explosion. Instead, the Big Bang represents a transition from a singularity to an expanding universe, characterized by a hot, dense state. Key evidence for this theory includes the cosmological redshift, indicating that galaxies are moving away from each other. The conversation also touches on the philosophical implications of time, entropy, and the nature of the universe, emphasizing that there is no privileged point of origin in the cosmos.
PREREQUISITESAstronomers, physicists, cosmologists, and anyone interested in the fundamental questions of the universe's origin and the nature of time.
Then does time stop at the event horizon.
night_sky said:Is there a possibility of existence of other dimension other than the existing one inside black hole.
Zeno Marx said:Since QFT works perfectly well with massless particles and massless particles experience no time (a photon having no rest mass has no inertial rest frame and so exists frozen in phase between emission and absorption - If you ever could realize young Einstein's daydream of riding on a lightwave from YOUR perspective you would get anywhere instantly) the question of the origin of time is identical to the question of the origin of mass - ie: time started when the higgs field "turned on". So the Higgs mechanism is the origin of time.
Zeno Marx said:Since QFT works perfectly well with massless particles and massless particles experience no time (a photon having no rest mass has no inertial rest frame and so exists frozen in phase between emission and absorption - If you ever could realize young Einstein's daydream of riding on a lightwave from YOUR perspective you would get anywhere instantly) the question of the origin of time is identical to the question of the origin of mass - ie: time started when the higgs field "turned on". So the Higgs mechanism is the origin of time.
phinds said:Personal speculation is against the rules on this forum, so you'll need to back that up with a reliable source.
Drakkith said:As far as I know this is most likely incorrect. The lorentz transformation does not apply to photons since they travel at c. Since you can't apply it, that means that whatever results it would come up with when you use it are probably invalid. Such as photons not experiencing time.
Zeno Marx said:I don't agree - the equation of time dilation is mass independent so there should be no problem with the following thought experiment - take a massive particle and start to accelerate it - when you get near the relativistic limit start to decrease its mass so you can keep accelerating it - evetaully once you have evaporated all its mass the time dilation becomes infinite ie: you have effectively elimiated the time dimension. This is why we know neutrinos have to have mass because massless particles can't change any of their properties between absorption and emission so flavour oscillation implies neutrino mass
The fact that proper time vanishes along null geodesics is nothing more than mathematical-there is nothing physical to be extrapolated from it. If anything, all it says is that you cannot parametrize null geodesics by proper time, which removes the physical interpretation of "timelessness".
. On the other hand, Ed Witten did do some twister/string theory work in the last few years even though he harbors some reservations about twister theory.It certainly makes no ambiguous physical predictions
Naty1 said:wannabe:
I do not get why Penrose thinks time would necessarily originate with mass via Higgs. Seems like time should precede Higgs, but maybe Penrose sees it differently?