Time and Motion: An Unbreakable Connection?

  • Thread starter Thread starter phylicity
  • Start date Start date
phylicity
Messages
5
Reaction score
0
I've often wondered... can time exist if there is no motion? Or can motion only occur if there is time? (or are both the same idea lol...?)
Your thoughts/knowledge?
 
Physics news on Phys.org
What does 'exist' mean?
 
Exist = occur... I don't know if that's the right word, sorry.
 
If you can't say exactly what you mean by 'exist', it's a meaningless question.
 
Okay. Can time progress? As in, can there be time without there being motion?
 
I can certainly imagine experiencing subjective time (temporal arrangement of thoughts) without ever witnessing any motion visually. Can we think without any motion in our brains? Maybe, but it doesn't fit with any physical theories that we have today, and seems highly unlikely.
 

Thread 'I don't see how a black hole's event horizon can be crossed'

OK, so this has bugged me for a while about the equivalence principle and the black hole information paradox. If black holes "evaporate" via Hawking radiation, then they cannot exist forever. So, from my external perspective, watching the person fall in, they slow down, freeze, and redshift to "nothing," but never cross the event horizon. Does the equivalence principle say my perspective is valid? If it does, is it possible that that person really never crossed the event horizon? The...
View full post »

Thread 'Synchronizing clocks in an inertial frame if light is anisotropic'

ASSUMPTIONS 1. Two identical clocks A and B in the same inertial frame are stationary relative to each other a fixed distance L apart. Time passes at the same rate for both. 2. Both clocks are able to send/receive light signals and to write/read the send/receive times into signals. 3. The speed of light is anisotropic. METHOD 1. At time t[A1] and time t[B1], clock A sends a light signal to clock B. The clock B time is unknown to A. 2. Clock B receives the signal from A at time t[B2] and...
View full post »

Thread 'Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?'

From $$0 = \delta(g^{\alpha\mu}g_{\mu\nu}) = g^{\alpha\mu} \delta g_{\mu\nu} + g_{\mu\nu} \delta g^{\alpha\mu}$$ we have $$g^{\alpha\mu} \delta g_{\mu\nu} = -g_{\mu\nu} \delta g^{\alpha\mu} \,\, . $$ Multiply both sides by ##g_{\alpha\beta}## to get $$\delta g_{\beta\nu} = -g_{\alpha\beta} g_{\mu\nu} \delta g^{\alpha\mu} \qquad(*)$$ (This is Dirac's eq. (26.9) in "GTR".) On the other hand, the variation ##\delta g^{\alpha\mu} = \bar{g}^{\alpha\mu} - g^{\alpha\mu}## should be a tensor...
View full post »

Similar threads

I Confused about time dilation -- motion vs energy
Replies
9
Views
363
I Time dilation for two observers in relative motion
Replies
10
Views
2K
I Is the instantaneous collapse of the wave function frame dependent?
Replies
9
Views
1K
I Symmetry of motion in the special theory of relativity
Replies
37
Views
2K
I "Exploring Time Perception Across Different Regions of Space"
Replies
20
Views
2K
I Question about length contraction
Replies
45
Views
5K
B Is Time Defined by Relative Motion in SR and GR?
Replies
24
Views
2K
B The synchronization of clocks and the relativity of motion
2
Replies
84
Views
6K
B Trying to understand what "time" is (layperson)
Replies
21
Views
2K
I The Lorentz factor gamma and proper time
Replies
31
Views
2K

Hot Threads

Recent Insights

Back
Top