✦ LIBER ✦

Does the Tachyon Matter?

✍ Scribed by Alex Buchel; Peter Langfelder; Johannes Walcher

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 95 KB
Volume: 302
Category: Article
ISSN: 0003-4916
DOI: 10.1006/aphy.2002.6306

No coin nor oath required. For personal study only.

✦ Synopsis

We study time-dependent solutions of Einstein-Maxwell gravity in four dimensions coupled to tachyon matter-the Dirac-Born-Infeld Lagrangian that provides an effective description of a decaying tachyon on an unstable D-brane in string theory. Asymptotically, the solutions are similar to the recently studied space-like brane solutions and carry S-brane charge. They do not break the Lorentzian Rsymmetry. We study tachyon matter as a probe in such a background and analyze its backreaction. For early/late times, the tachyon field has a constant energy density and vanishing pressure as in flat space. On the other hand, at intermediate times, the energy density of the tachyon diverges and produces a space-like curvature singularity.

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