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Marcus points us to this new paper:
http://arxiv.org/abs/astro-ph/0607380
Solving the Problem of Time in General Relativity and Cosmology with Phantoms and k -- Essence
Thomas Thiemann
He introduces a negative energy scalar field, which he calls phantom because it is unobservable, in order to solve the problem of time in GR. He issues this challenge to common wisdom:
Any comments?
http://arxiv.org/abs/astro-ph/0607380
Solving the Problem of Time in General Relativity and Cosmology with Phantoms and k -- Essence
Thomas Thiemann
He introduces a negative energy scalar field, which he calls phantom because it is unobservable, in order to solve the problem of time in GR. He issues this challenge to common wisdom:
All textbooks on classical GR incorrectly describe the Friedmann equations as physical evolution equations rather than what they really are, namely gauge transformation equations. The true evolution equations acquire possibly observable modifications to the gauge transformation equations whose magnitude depends on the physical clock that one uses to deparametrise the gauge transformation equations.
Any comments?