All Questions
188
questions
2
votes
2
answers
2k
views
Is time subjective?
In Minkowski spacetime time is subjective [or more precisely: time is different for every particle/ reference frame]. It is the coordinate time of an observer whose reference frame travels up the $ct$-...
- 3,155
0
votes
3
answers
382
views
Is proper time an intrinsic value of Minkowski space?
What is proper time? Is it a part of Minkowski space (that is a mere spacetime interval)? Or is it an intrinsic characteristic of massive particles (a sort of "aging")? Example: In the following ...
- 3,155
1
vote
3
answers
338
views
Spacetime, space observables and time observables
It appears to me that the concepts of space and time play a privileged role in Physical Theories.
If we look at classical non-relativistic theories such as point particle mechanics, rigid body ...
- 313
9
votes
5
answers
8k
views
Why is causality preserved in special relativity?
PART 1:
I was reading the article Relativity of simultaneity Wikipedia. I couldn't understand this line:
"if the two events are causally connected ("event A causes event B"), the causal order is ...
- 1,601
163
votes
9
answers
40k
views
Does someone falling into a black hole see the end of the universe?
This question was prompted by Can matter really fall through an event horizon?. Notoriously, if you calculate the Schwarzschild coordinate time for anything, matter or light, to reach the event ...
- 358k
0
votes
1
answer
113
views
Which twin produces more widgets?
Two twins are identical in every way, including their widget production.
One twin goes on a long space trip at near the speed of light to produce widgets during the trip.
When space-twin returns he ...
0
votes
2
answers
1k
views
Time dilation at the speed of light
Does a massless particle travelling at the speed on light in a vacuum (c) experience an infinite time dilation effect?
i.e. Would the time dilation extend from the perspective of the massless ...
- 111
8
votes
4
answers
5k
views
Why is time-order invariant in timelike interval?
Why do two observers measure the same order of events if we are inside the light cone?
(e.g. if $ds^2 > 0$ time-order is preserved according to the classical mechanics book I am reading, but it ...
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