On 1/4/2014 7:10 PM, LizR wrote:
On 5 January 2014 16:03, meekerdb <[email protected] <mailto:[email protected]>>
wrote:
On 1/4/2014 6:01 PM, Jason Resch wrote:
4. If block time corresponds to clock time, then how can there be a
single
block time structure that encompasses all events when clock times
progress
faster or slower for different observers?
This corresponds to different objects having different velocities
through space
time.
Really just different directions through spacetime. Everything always
moves at
proper speed 1 (at least classically).
What exactly is "proper speed" in SR?
Dx/Dtau, where x is the coordinate vector and tau is the proper time (what a clock
measures) and D is the covariant derivative. In flat space, i.e. SR, it reduces to the
ordinary derivative dx/dtau. Notice that in the rest frame it's always (1,0,0,0), i.e. all
the 'speed' is along the time coordinate.
Brent
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