Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-03-11
JHEP 0906:050,2009
Physics
High Energy Physics
High Energy Physics - Theory
4 figures,19pp
Scientific paper
10.1088/1126-6708/2009/06/050
We investigate the spacetime-dependent condensation of the tachyon in effective field theories. Previous work identified singularities in the field which appear in finite time: infinite gradients at the kinks, and (in the eikonal approximation) caustics near local minima. By performing a perturbation analysis, and with numerical simulations, we demonstrate and explain key features of the condensation process: perturbations generically freeze, and minima develop singular second derivatives in finite time (caustics). This last has previously been understood in terms of the eikonal approximation to the dynamics. We show explicitly from the field equations how this approximation emerges, and how the caustics develop, both in the DBI and BSFT effective actions. We also investigate the equation of state parameter of tachyon matter showing that it is small, but generically non-zero. The energy density tends to infinity near field minima with a charateristic profile. A proposal to regulate infinities by modifying the effective action is also studied. We find that although the infinities at the kinks are successfully regularised in the time-dependent case, caustics still present.
Hindmarsh Mark
Li Huiquan
No associations
LandOfFree
Inhomogeneous tachyon condensation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Inhomogeneous tachyon condensation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inhomogeneous tachyon condensation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-124293