Tachyon couplings on non-BPS D-branes and Dirac–Born–Infeld action

Abstract

By explicit evaluation of certain disk S-matrix elements in the presence of background B-flux, we find coupling of two open string tachyons to gauge field, graviton, dilaton or Kalb-Ramond antisymmetric tensor on the world-volume of a single non-BPS Dp-brane. We then propose an extension of the abelian Dirac-Born-Infeld action which naturally reproduces these couplings in field theory. This action includes non-linearly the dynamics of the tachyon field much like the other bosonic modes of the non-BPS Dp-brane. On the general grounds of gauge and T-duality transformations and the symmetrized trace prescription, we then extend the abelian action to non-abelian cases.

Gauge fields and fermions in tachyon effective field theories

“…In fact, our analysis of actions with higher derivatives in section 6 shows that solvability is still possible if, following [27,28], we include the tachyon kinetic term inside the square root giving…”

“…In particular, judicious choices of the form of f allow us to obtain (solvable) Born-Infeld type actions. In particular we study a Born-Infeld type action proposed by Garousi [27] and Bergshoeff et al [28], where the tachyon kinetic term is insider the Born-Infeld square root. Such an action was argued to be consistent with open string scattering amplitudes and T duality.…”

Reheating from Tachyon Condensation

“…Nevertheless, it is known that the tachyon couples to massless gauge fields; one form that has been suggested for the low energy theory is the Dirac-Born-Infeld action [16,17], 2…”

Gravitational Radiation of Rolling Tachyon

“…One can make the statement in more quantitative sense by invoking the effective field theory analysis of the rolling tachyon [3], which is described by the following DBI-type lagrangian [7] − 5) where the tachyon potential V (T ) ∼ e −T /2 . From (4.5) we can derive the energy density for the system, which is…”