Observing the Spontaneous Breakdown of Unitarity

Tree Unitarity Breakdown in Spontaneously Broken N=1 Supergravity Theories and Phenomenology of a Superlight Gravitino

New Electroweak Instanton and Possible Breakdown of Unitarity

Potential implications of a new constrained instanton solution in the electroweak standard model are discussed. Notably, there may be a non-perturbative unitarity violating contribution to the total cross-section at high collision energies.

Probing Spontaneous CP-Violation in Supersymmetric Models via B-Decays

We study implications of spontaneous CP-violation in minimal susy models for CP-asymmetries in rare B, B̄-decays. In particular, we estimate characteristic values of the angles of the unitarity triangle and show that sizeable CP-violating effects result from B − B̄ mixing only. Significant deviations from the SM predictions are pointed out.

Fluctuation-dissipation theorem and quantum tunneling with dissipation

We suggest to take the fluctuation-dissipation theorem of Callen and Welton as a basis to study quantum dissipative phenomena ( such as macroscopic quantum tunneling ) in a manner analogous to the Nambu-Goldstone theorem for spontaneous symmetry breakdown. It is shown that the essential physical contents of the Caldeira-Leggett model such as the suppression of quantum coherence by Ohmic dissipa...

The Higgs - Kibble Model on the Basis of a Canonical Yang - Mills Field Theory with Gauge Covariance

A renormalization scheme of a canonical Yang-Mills field theory proposed previously is applied to the SU(2) Biggs-Kibble model. After the spontaneous breakdown of symmetry under the gauge group SU (2), a complex spinor scalar field is represented by its components being assigned as a singlet and a triplet of the global gauge group, while it still corresponds to a doublet under the Becchi-Rouet-...