UK-QFT XI

Session

Talks

9 Jan 2023, 15:45

Cambridge Centre for Mathematical Sciences (University of Cambridge)

13. How to find the Feynman Rules from any scalar-tensor theory and not collapse in the process

Sergio Sevillano

09/01/2023, 15:45

Talk

The ability to represent perturbative expansions of interacting quantum field theories in terms of simple diagrammatic rules has revolutionised calculations in particle physics. However, in the case of extended theories of gravity, deriving this set of rules requires linearization of gravity, perturbation of the scalar fields and multiple field redefinitions, making this process very...

7. Unified description of corpuscular and fuzzy scalar dark matter

Alex Soto (Newcastle University)

09/01/2023, 16:10

Talk

We derive coupled equations for self-interacting scalar dark matter, which can include both a condensed, low momentum ''fuzzy'' component and one with higher momenta that may be described as a collection of classical particles. We do this from first principles, using the Schwinger-Keldysh path integral and the corresponding Feynman diagrams in a perturbative expansion. The resulting coupled...

5. From the tabletop to the Big Bang: Quantum simulators of false vacuum decay

Alexander C Jenkins (University College London)

09/01/2023, 16:35

Talk

False vacuum decay (FVD) plays a vital role in many models of the early Universe, with important implications for inflation, the electroweak vacuum, and gravitational waves. However, it is also a highly non-perturbative and non-equilibrium process which is challenging to model theoretically, with existing Euclidean methods relying on numerous assumptions that have yet to be empirically...