UK Cosmology Meeting

Session

Afternoon Session 1

25 Mar 2026, 13:45

Andrew Jaffe

8. The Sartorial Universe: Dressing and Cutting from Flat Space to dS

Joe Marshall (Durham University)

25/03/2026, 13:45

While the cosmological wavefunction has received much attention over the years, being the object dual to CFT correlators in attempts at constructing a dS/CFT correspondence, the in-in correlator has several nice properties which render it in some sense "simpler" — despite being constructed from the wavefunction. In this talk, I will discuss how in-in correlators can be directly obtained from...

9. Cosmic Lockdown: When Decoherence Saves the Universe from Tunnelling.

Robson Christie (University of Portsmouth)

25/03/2026, 14:05

I will discuss vacuum selection for a spectator scalar field in an asymmetric double-well potential during inflation, including environmental decoherence. Using numerically solved master equations, we show that the ratio between the inflationary Hubble scale and the spectator mass controls which vacuum is selected: heavy fields relax to the true vacuum, while light fields display greatly...

6. CMB Cosmology with Simulation-Based Inference

Xing Li (Imperial College London)

25/03/2026, 14:25

Simulation-based inference (SBI) provides a likelihood-free framework for cosmological parameter inference directly from forward simulations. In this work, we apply SBI methods to CMB cosmology and implement a full Planck-like analysis pipeline, including realistic simulations and data processing.