The Tachyon in a Linear Expanding Universe

Details The Tachyon in a Linear Expanding Universe The Tachyon in a Linear Expanding Universe

1992-12-16

arxiv.org/abs/hep-th/9212099v1

Phys.Lett. B301 (1993) 29-36

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, Latex, DESY 92-179

Scientific paper

10.1016/0370-2693(93)90716-U

We investigate the tachyon coupling in a static Robertson--Walker like metric background. For a tachyon and dilaton field which are only time dependent one can rewrite this model as a SU(2) Wess--Zumino--Witten model and a scalar Feigin--Fuchs theory. In this case the restriction to a real exponential tachyon field fixes the level $k$ of the Wess--Zumino--Witten model. For a spatially dependent tachyon the world radius and the dilaton are quantized in terms of $k$ and the tachyon by two integers, i.e. one has a discrete set of fields. The spatial part of the tachyon is given by Chebyshev polynomials of the second kind. An investigation of the tachyon mass shows that the tachyon is massless for $k=1$.

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