Non-Commutative Gauge Theories and the Cosmological Constant
Non-Commutative Gauge Theories and the Cosmological Constant
We discuss the issue of the cosmological constant in noncommutative nonsupersymmetric gauge theories. In particular, in orbifold field theories noncommutativity acts as a UV cutoff. We suggest that in these theories quantum corrections give rise to a vacuum energy \ensuremath{\rho} that is controlled by the noncommutativity parameter \ensuremath{\theta}, $\ensuremath{\rho}\ensuremath{\sim}1/{\ensuremath{\theta}}^{2}$ (only …