Topics in supersymmetry breaking

The author reviews briefly the breaking of global and local supersymmetry. He considers the left-right symmetric model in the spontaneously broken low energy supergravity. The phases of the A parameters, complex gaugino masses and the unitary matrices which diagnalize the fermion mass matrices are new sources of CP violation. He evaluates the contributions to the neutron electric dipole moment. Provided that the left-right symmetry breaking scale is higher than 1 TeV, the author finds the upper bound of it to be ∼10-25 e cm x (CP violating phases). This limit is comparable to the experimental to the experimental bound 6 x 10-25 e cm and CP violating phases in this model need not be unnaturally small. This is in contrast to the ease of the supersymmetric standard model where CP phases must be smaller than 10-3 in order not to violate the experimental bound. Next the author describes briefly the field theory limit of superstring theories starting from 10-dimensional supergravity. Then he considers the N = 1 supersymmetry breaking using Witten's truncated Lagrangian as a low energy model of E8 x E8' heterotic superstrings