Closed string radiation from moving D-branes

Hussain, Faheem; Iengo, Roberto; Nunez, Carmen A.; Scrucca, Claudio A.

doi:10.1016/S0550-3213(98)00088-1

Closed string radiation from moving D-branes

Faheem Hussain
(
- ICTP, Trieste
)
,
Roberto Iengo
(
- SISSA, Trieste and
- INFN, Trieste
)
,
Carmen A. Nunez
(
- Buenos Aires, IAFE
)
,
Claudio A. Scrucca
(
- SISSA, Trieste and
- INFN, Trieste and
- Neuchatel U.
)

Oct, 1997

33 pages

Published in:

Nucl.Phys.B 517 (1998) 92-124

e-Print:

hep-th/9710049 [hep-th]

DOI:

10.1016/S0550-3213(98)00088-1

Report number:

IC-97-158,
SISSA-129-97-EP

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Abstract:

We compute the amplitude for the radiation of massless NS-NS closed string states from the interaction of two moving D-branes. We consider particle-like D-branes with reference to 4-dimensional spacetime, in toroidal and orbifold compactifications, and we work out the relevant world sheet propagators within the moving boundary state formalism. We find no on-shell axion emission. For large inter-brane separation, we compute the spacetime graviton emission amplitude and estimate the average energy radiated, whereas the spacetime dilaton amplitude is found to vanish in this limit. The possibility of emission of other massless states depends on the nature of the branes and of the compactification scheme.

Note:

41 pages, LaTex Report-no: SISSA REF 129/97/EP, IC/97/158

11.25.-w
String theory
D-branes
string model
radiation
phase space
membrane model: D-brane
scattering amplitude
axion
dilaton

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