Universal moduli dependent string thresholds in Z(2) x Z(2) orbifolds - INSPIRE

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Universal moduli dependent string thresholds in Z(2) x Z(2) orbifolds

P.M. Petropoulos
(
- CERN
)
,
J. Rizos
(
- CERN and
- Ioannina U. and
- SISSA, Trieste
)

Jan, 1996

12 pages

Published in:

Phys.Lett.B 374 (1996) 49-56

e-Print:

hep-th/9601037 [hep-th]

DOI:

10.1016/0370-2693(96)00230-4

Report number:

CERN-TH-95-284,
SISSA-170-95-EP

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Abstract:

In the context of a recently proposed method for computing exactly string loop corrections regularized in the infra-red, we determine and calculate the universal moduli-dependent part of the threshold corrections to the gauge couplings for the symmetric

Z_2\times Z_2

orbifold model. We show that these corrections decrease the unification scale of the underlying effective field theory. We also comment on the relation between this infra-red regularization scheme and other proposed methods.

Note:

12 pages, contains two figures Report-no: CERN-TH/95-284, SISSA/170/95/EP

string model
effective action
field theory: orbifold
symmetry: Z(2) x Z(2)
field theory: soliton
perturbation theory: higher-order
numerical calculations

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