String Loop Divergences and Effective Lagrangians
نویسنده
چکیده
We isolate logarithmic divergences from bosonic string amplitudes on a disc. These divergences are compared with “tadpole” divergences in the effective field theory with a covariant cosmological term implied by the counting of string coupling constants. We find an inconsistency between the two. This is a serious problem which could undermine the ability to remove divergences from the bosonic string. Submitted to Nuclear Physics B * Work supported by NSF PHY 86-05978 and Robert Welch Foundation. HWork supported by DOE grant DE-AC03-76SF00515 -Work supported by NSF PHY 812280.
منابع مشابه
String Perturbation Theory and Effective Lagrangians*
We isolate logarithmic divergences from bosonic string amplitudes on a disc. These divergences are compared with ‘tadpole’ divergences in the effective field u theory with a cosmological term, which also contains an effective potential for the dilaton. Also, corrections to p-functions are compared with variations of the effective action. In both cases we find an inconsistency between the two. T...
متن کاملClosed-string Tachyon Condensation and On-shell Effective Action of Open-string Tachyons
We study how the effect of closed-string tachyon condensation can enter into the on-shell effective action of open-string tachyons, for bosonic case. We also consider the open-string one-loop quantum corrections to the action. We use sigma-model approach with boundary terms, and we utilize some results of boundary string field theory (BSFT) to define the on-shell effective action. We regard D-i...
متن کاملTowards effective Lagrangians for adelic strings
p-Adic strings are important objects of string theory, as well as of p-adic mathematical physics and nonlocal cosmology. By a concept of adelic string one can unify and simultaneously study various aspects of ordinary and p-adic strings. By this way, one can consider adelic strings as a very useful instrument in the further investigation of modern string theory. It is remarkable that for some s...
متن کاملQuadratic Divergences in Effective Supergravity from the Heterotic Superstring
Results from studies of effective Lagrangians for gaugino condensation are summarized and re-examined with an eye to previously neglected one-loop quadratically divergent corrections. Talk presented at the Nathfest, Northeastern University, Boston, MA, August 14–15, 2004, to be published in the proceedings of PASCOS04. This work was supported in part by the Director, Office of Energy Research, ...
متن کاملOn the DLCQ as a light-like limit in string theory
We study the issue of defining the discrete light-cone quantization (DLCQ) in perturbative string theory as a light-like limit. While this limit is unproblematic at the classical level, it is non-trivial at the quantum level due to the divergences by the zeromode loops. We reconsider this problem in bosonic string theory. We construct the multi-loop scattering amplitudes in both open and closed...
متن کامل