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Semiclassical Methods for Nonlinear Field Theories

  • Michael Udemba

Event description

Many modifications to the standard models of particle physics and cosmology lead to new forces. The effects of these so-called “fifth-forces” can be long range if the exchange particles that mediate them are light. Naturally, any viable fifth-force theory must account for its non-observation. One class of theories achieves this by introducing nonlinearities to the equations that describe the underlying fields, consequently screening them from local experiments. These nonlinearities present a challenge for characterising the quantum effects of fifth-force theories; even the question of whether the quantum corrections are relevant remains open for some. In this talk, I will discuss the saddlepoint approximation – a semiclassical method for computing leading order quantum corrections. I will demonstrate its effectiveness in the context of vacuum decay, and briefly discuss its relevance for fifth-force theories.

Semiclassical Methods for Nonlinear Field Theories


Higgs Centre Seminar Room, JCMB (Find us on campus maps)
The Higgs Centre for Theoretical Physics
School of Physics and Astronomy
James Clerk Maxwell Building, 4305
Peter Guthrie Tait Road

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