Exciting gauge field and gravitons in a brane-anti-brane annihilation

TL;DR

It is pointed out that a tachyonic instability helps fragmenting the homogeneous tachyon and excites gauge field and contributes to the stress-energy tensor which also feeds into the gravity waves.

Abstract

In this paper we point out the inevitability of an explosive production of gauge field and gravity wave during an open string tachyon condensation in a cosmological setting. We will be particularly studying an example of brane-anti-brane inflation in a warped throat where inflation ends via tachyon condensation. We point out that a tachyonic instability helps fragmenting the homogeneous tachyon and excites gauge field and contributes to the stress energy tensor which also feeds into the gravity waves.

Figures (5)

• Figure 1: The polynomial approximation we use has the advantage of allowing us to modify the tachyon mass at $\phi = 0$ independently of the quartic term. The downside is that the the value of the potential at its minimum is negative.
• Figure 2: Gravity wave energy with varying initial amplitudes. Note that different initial amplitudes saturate at a similar value for a fixed tachyon mass $\sim M_{s}/2$.
• Figure 3: The energy components of the tachyon and gauge field for the tachyon mass $M_{S}/2$. Note that the total energy remains conserved.
• Figure 4: The energy pumped into the gauge field and the gravity waves.
• Figure 5: Snap-shots of iso-surface of the energy density for the gauge field, gravity waves, tachyon and the inflaton (from left-to-right) at $t=300$.