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String Mass Shifts · Around

2009

String Mass Shifts

Chialva, Diego

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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.

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D. Chialva, “Self-interacting fundamental strings and black holes”, arXiv:0903.3977 [hep-th]

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