Time and Tachyon

Details Time and Tachyon Time and Tachyon

2002-09-16

arxiv.org/abs/hep-th/0209122v1

Int.J.Mod.Phys.A18:4869-4888,2003

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX file, 24 pages

Scientific paper

10.1142/S0217751X03015313

Recent analysis suggests that the classical dynamics of a tachyon on an unstable D-brane is described by a scalar Born-Infeld type action with a runaway potential. The classical configurations in this theory at late time are in one to one correspondence with the configuration of a system of non-interacting (incoherent), non-rotating dust. We discuss some aspects of canonical quantization of this field theory coupled to gravity, and explore, following earlier work on this subject, the possibility of using the scalar field (tachyon) as the definition of time in quantum cosmology. At late `time' we can identify a subsector in which the scalar field decouples from gravity and we recover the usual Wheeler - de Witt equation of quantum gravity.

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