Originally posted by siddharthsma
... Distance is directly proportional to Time, doesn't that mean that as the distance from the centre of the Universe increases ( or as the Universe
expands) , time increases or progresses. Does this not imply that time is simply the result of the steady expansion of the Universe ?
Well, what you say is true but you are applying Newtonian mechanics to the universe, which you cannot do.
D=s*T this is true in the case of bodies in one inertial frame but in the case of the universe this formula cannot be applied so simply. When we say
that distance is directly proportional to time it is wrt to constant velocity, as we all know, so as the universe expands with a constant velocity
time increases. This is not to say that time would cease to continue if the universe were to stop expanding, but as time increases the universe
But this cannot be applied to the universe as the universe does not expand with uniform velocity or at a constant rate through out the universe, it is
speculated that the rate of expansion of the universe is increasing continuously i.e. velocity changes with time.
Even if you could apply the above Newtonian law, you should imagine this scenario: Imagine if you apply a force on a ball and it moves at constant
velocity i.e. zero acceleration then the distance traveled by the ball would be directly proportional to the time taken, conversely if the time taken
by the ball would depend on the distance covered i.e. for say 10sec a span of 20 feet and 11th sec 20.5feet and so on. You cannot say that the time on
your watch is a result of the motion of the ball only
(the reason I say only I will explain later) and no motion of the ball would mean no time
A similar thing applies to the universe in general.
Originally posted by siddharthsma
Will this mean that if the Universe were to stop expanding, time would stop. But again there is a catch, because it means that the Universe is doing
something and time is responding afterwards, which is impossible because we all know that if something happens, that means time is passing.
Time is known as the measurement of flow basically. As long as the universe observes flow in the system we say that time passes. If the universe were
to stop 'flowing' then time would stop! Expansion of the universe is only one contributor to the total flow of the universe as a whole.
Flow is basically movement of atoms, electrons, energy etc. If every single particle in the universe were to stop and if all energy was to suddenly
freeze then we would attain zero flow - which would result in the stoppage of time as we know it but we would not be able to tell the difference as we
would be in suspended animation ourselves, time could have stopped many times and we wouldn't have known about it at all. (That’s why I said
So even if the universe were to stop expanding time would still carry on but albeit a bit slower than before but we won't be able to notice it as we
are part of the same frame of reference. Now time and matter ( I don' t know if this part is correct
) I think have a spontaneous relation i.e.
time and flow are related instantaneously as time changes flow changes too or so on I think.
Tachyons are particles that have not been accepted to exist even theoretically, they are speculated to exist and their relation to the universe is
not well known, I think they are particles of the multiverse and lie outside all other frames as follow the master sets laws while they exert
influence on our frame.
I hope this is not very confusing and drawn out but this is very basic stuff which you could get from any good physics book (not my interpretations
) Try if you can read this.
[edit on 23-4-2005 by IAF101]