Mach's principle and aether
- From: Amine <tfovid@xxxxxxxxx>
- Date: Tue, 11 Mar 2008 07:42:17 -0700 (PDT)
Do the Cosmic Microwave Background and "fixed, distant" galaxies have
anything in common? Is there anyway to account for Mach's Principle
without any reference to some kind of aether?
Along the same lines, here is a thought experiment... Assume an
astronaut, Bob, is alone in the universe (i.e. absolutely alone, with
no distant background or "fixed" matter anywhere). Then any kind of
acceleration would be impossible since there would be no energy/matter
to generate a position-dependent metric. Assume now that the astronaut
has a twin, Alice. The only space-time Alice can evolve in is the one
that is curved, albeit very little, by Bob's mass, and vice-versa.Now
let's replay the usual "twin paradox". Alice fires up her rockets,
travels away from Bob, then makes a U-turn and goes back to Bob.
Will she feel any acceleration (aka gravity) when making that U-turn?
What is it that generated that curvature of space-time in her co-
moving frame? Why wouldn't it be Bob who's accelerating? Or maybe...
rocket's won't even work in this lonely two-body universe?
.
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