TL;DR
This paper demonstrates that unwrapped type 0 NS5-branes are inherently unstable and decay smoothly into bubbles of nothing, linking tachyon condensation to brane instability.
Contribution
It reveals a new decay mechanism for NS5-branes in type 0 string theory, connecting tachyon instability with brane decay processes.
Findings
Unwrapped NS5-branes decay to bubbles of nothing without tunneling.
Tachyon condensation relates to NS5-brane instability.
Decay occurs smoothly even with twisted boundary conditions.
Abstract
The perturbative vacuum of type 0 string theory is unstable due to the existence of the closed string tachyon. This instability can be removed by S^1 compactification with twisted boundary condition for the tachyon field. We show that even in this situation unwrapped NS5-branes are unstable and decay to bubbles of nothing smoothly without tunneling any potential barrier. We discuss a relation between the closed string tachyon condensation and the instability of NS5-branes.
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