String Mass Shifts
arXiv:0903.3979 · doi:10.1016/j.nuclphysb.2009.04.023
Abstract
We study closed string one-loop amplitudes in string theory, in particular the average mass shift for states at given mass and Neveu-Schwarz charges. Our analysis is based only on well-defined string amplitudes and the exploitation of symmetries and unitarity properties of the torus amplitudes. We obtain the result Delta M^2 = - g_s^2 M^(2+(3-D)/2) in D spacetime dimensions for the average closed string mas-shift (Delta M^2 = - g_s^2 (M^2-Q^2)^(1+(3-D)/4) for states with non-zero Neveu-Schwarz charges Q). An interesting picture of one-loop corrections for the string in non-supersymmetric configurations comes out: the dominant interactions responsible for these corrections are of long-range type (namely gravitational) and it appears that perturbations theory is generally reliable on the spectrum of massive string states.
38 pages plus references, typos corrected, notation and text improved
References in corpus (2)
Cited by in corpus (14)
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