### Abstract

We compute the lowest components of the type-II Ramond-Ramond boundary state for the tachyon profile T(X) = λe^{X0/√2} by direct path integral evaluation. The calculation is made possible by noting that the integrals involved in the requisite disk one-point functions reduce to integrals over the product group manifold U(n) × U(m). We further note that one-point functions of more general closed string operators in this background can also be related to U(n) × U(m) group integrals. Using this boundary state, we compute the closed string emission from a decaying unstable Dp-brane of type-II string theory. We also discuss closed string emission from the tachyon profile T(X) = λcosh(X^{0}/√2). We find in both cases that the total number of particles produced diverges for p = 0, while the energy radiated into closed string modes diverges for p ≤ 2, in precise analogy to the bosonic case.

Original language | English (US) |
---|---|

Pages (from-to) | 841-863 |

Number of pages | 23 |

Journal | Journal of High Energy Physics |

Issue number | 1 |

State | Published - Jan 1 2005 |

Externally published | Yes |

### Fingerprint

### Keywords

- Superstrings and Heterotic Strings
- Tachyon Condensation

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*Journal of High Energy Physics*, (1), 841-863.

**Closed superstring emission from rolling tachyon backgrounds.** / Shelton, Jessie.

Research output: Contribution to journal › Article

*Journal of High Energy Physics*, no. 1, pp. 841-863.

}

TY - JOUR

T1 - Closed superstring emission from rolling tachyon backgrounds

AU - Shelton, Jessie

PY - 2005/1/1

Y1 - 2005/1/1

N2 - We compute the lowest components of the type-II Ramond-Ramond boundary state for the tachyon profile T(X) = λeX0/√2 by direct path integral evaluation. The calculation is made possible by noting that the integrals involved in the requisite disk one-point functions reduce to integrals over the product group manifold U(n) × U(m). We further note that one-point functions of more general closed string operators in this background can also be related to U(n) × U(m) group integrals. Using this boundary state, we compute the closed string emission from a decaying unstable Dp-brane of type-II string theory. We also discuss closed string emission from the tachyon profile T(X) = λcosh(X0/√2). We find in both cases that the total number of particles produced diverges for p = 0, while the energy radiated into closed string modes diverges for p ≤ 2, in precise analogy to the bosonic case.

AB - We compute the lowest components of the type-II Ramond-Ramond boundary state for the tachyon profile T(X) = λeX0/√2 by direct path integral evaluation. The calculation is made possible by noting that the integrals involved in the requisite disk one-point functions reduce to integrals over the product group manifold U(n) × U(m). We further note that one-point functions of more general closed string operators in this background can also be related to U(n) × U(m) group integrals. Using this boundary state, we compute the closed string emission from a decaying unstable Dp-brane of type-II string theory. We also discuss closed string emission from the tachyon profile T(X) = λcosh(X0/√2). We find in both cases that the total number of particles produced diverges for p = 0, while the energy radiated into closed string modes diverges for p ≤ 2, in precise analogy to the bosonic case.

KW - Superstrings and Heterotic Strings

KW - Tachyon Condensation

UR - http://www.scopus.com/inward/record.url?scp=24944566331&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=24944566331&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:24944566331

SP - 841

EP - 863

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1126-6708

IS - 1

ER -