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We use the method of thermal QCD sum rules to investigate the effects of temperature on the neutron electric dipole moment d n induced by the vacuumθ-angle. Then, we analyze and discuss the thermal behaviour of the ratio | dn θ | in connection with the restoration of the CP-invariance at finite temperature. *

We extend the Vecchia-Veneziano-Witten (VVW) model of QCD in the chiral limit and for large colour number N c , by introducing an effective dilaton-gluon coupling from which we derive both the axion and dilaton potentials. Furthermore, using a string inspired model, we determine a new interquark potential as a perturbative series in terms of the interquark distance r. Our potential goes beyond Dick one obtained in [8] and shares the same features as the Bian-Huang-Shen potential V BHS which depends only on odd powers of r [22]. * mchabab@ucam.ac.ma

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