Found 3 result(s)

### 30.01.2020 (Thursday)

#### Non-Hermitian extension of the Standard Model

Regular Seminar Jean Alexandre (King's College)

 at: 14:00 QMWroom G O Jones 610 abstract: The work presented here explores the possibility of introducing non-Hermitian scalar and fermion mass terms, in addition to the usual Hermitian ones. The consistency of the resulting description requires a reworking of all the fundamental properties in Field Theory from the beginning, which is challenging but appears to be possible.

### 19.11.2019 (Tuesday)

#### Making sense of a non-Hermitian Lagrangian in Field Theory

Regular Seminar Jean Alexandre (King's)

 at: 15:00 City U.room B104 abstract: Motivated by extending the parameter space of the Standard Model of Particle Physics, I will describe how to understand the effects of an imaginary mixing mass term in a non-Hermitian but PT-symmetric extension of scalar QED. The classical theory is already not trivial, and requires a new interpretation of the equations of motion, Noether's theorem and gauge invariance. The path integral can be defined with appropriate field variables, and a consistent picture emerges, opening the way for potential alternative descriptions of the Higgs sector.

### 26.11.2008 (Wednesday)

#### Non-perturbative conformal invariance for time-dependent string backgrounds

Regular Seminar Jean Alexandre (King's College)

 at: 14:00 ICroom H503 abstract: A specific configuration of the bosonic string is discussed, in time-dependent backgrounds, which satisfies Weyl invariance to all orders in the alpha'-expansion. Conformal invariance, valid in any space time dimension, is based on the homogeneity (in time) of the Weyl-beta functions which, using field redefinitions, can be made to vanish.