Does the tachyon matter?

Buchel, Alex; Langfelder, Peter; Walcher, Johannes

doi:10.1006/aphy.2002.6306

Does the tachyon matter?

Alex Buchel
(
- Santa Barbara, KITP
)
,
Peter Langfelder
(
- Santa Barbara, KITP and
- SUNY, Stony Brook
)
,
Johannes Walcher
(
- Santa Barbara, KITP
)

Jul, 2002

14 pages

Published in:

Annals Phys. 302 (2002) 78-87

e-Print:

hep-th/0207235 [hep-th]

DOI:

10.1006/aphy.2002.6306

Report number:

NSF-ITP-02-65,
YITP-SB-02-38

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Abstract:

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 R-symmetry. We study the 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.

supergravity
background field
Einstein-Maxwell equation: solution
Born-Infeld model
membrane model
tachyon
energy: density
pressure

References(25)

Figures(0)

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