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UK Cosmology Meeting

25 March 2026
Imperial College London, Abdus Salam Centre for Theoretical Physics
Europe/London timezone

Contribution List

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  1. 5. New tests of parity violation in the early universe: CMB polarisation experiment and calibration
    Claire Rigouzzo (King's College)
    25/03/2026, 10:00

    Precise polarization measurements of the Cosmic Microwave Background (CMB) provide an opportunity to rigorously test the standard cosmological model. The correlation between E and B modes, indicative of cosmic birefringence, is expected to arise from parity-violating physics in the Universe. However, detecting these EB correlations remains extremely challenging as it demands exceptionally...

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  2. 10. Phantom Crossing with Quintom Models
    Lisa Goh (University of Edinburgh/ Institute for Astronomy)
    25/03/2026, 10:20

    We develop a two-scalar field quintom model, which utilises both a quintessence-like and a phantom-like scalar field, enabling a smooth and stable transition across the w = −1 phantom divide as hinted by recent measurements of Baryonic Acoustic Oscillations (BAO) by the Dark Energy Spectroscopic Instrument (DESI) Data Release 2. We explore a range of initial conditions and potential...

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  3. 7. Scalar-Induced Gravitational Waves from Alternative Thermal Histories
    Aya Ghaleb (Swansea University)
    25/03/2026, 10:40

    Primordial curvature perturbations enhanced at small scales can generate a stochastic background of gravitational waves at second order. The shape and amplitude of this signal depend not only on the primordial power spectrum but also on the Universe’s thermal history. While many studies assume radiation domination, an early matter-dominated era followed by reheating leaves characteristic...

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  4. 3. Plenary Talk: Repeated gravitational wave bursts from cosmic strings
    Danièle Steer
    25/03/2026, 11:30

    50 years after Tom Kibble’s seminal paper on cosmic strings, research on strings remains active and their GW signatures are currently being searched for by, for instance, the LVK and PTA collaborations. While much focus is on the stochastic GW background from the ensemble of cosmic strings, cosmic string loops also generate short duration GW bursts with a characteristic waveform. In this talk...

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  5. 15. Poster Pitch
    Gerald Barnert
    25/03/2026, 12:20
  6. 16. Poster Pitch
    Alexander Roskill
    25/03/2026, 12:22
  7. 17. Poster Pitch
    Lawrence Berry
    25/03/2026, 12:24
  8. 24. Poster Pitch
    Enrico Specogna
    25/03/2026, 12:26
  9. 18. Poster Pitch
    Aditya Verma
    25/03/2026, 12:28
  10. 19. Poster Pitch
    Zizang Qiu (Edinburgh University)
    25/03/2026, 12:30
  11. 21. Poster Pitch
    Laurens Smulders
    25/03/2026, 12:32
  12. 22. Poster Pitch
    Lorenzo Tranchedone
    25/03/2026, 12:34
  13. 23. Poster Pitch
    Haoyang Jin
    25/03/2026, 12:36
  14. 20. Poster Pitch
    Arthur Whyley
    25/03/2026, 12:38
  15. 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...

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  16. 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...

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  17. 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.

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  18. 25. Poster Pitch
    Callum Bell
    25/03/2026, 14:45
  19. 26. Poster Pitch
    Trevor Cheung
    25/03/2026, 14:47
  20. 27. Poster Pitch
    Marisol Jimenez Cruz
    25/03/2026, 14:49
  21. 29. Poster Pitch
    Olga Garcia Gallego
    25/03/2026, 14:51
  22. 30. Poster Pitch
    Wei-Ning Deng
    25/03/2026, 14:53
  23. 31. Poster Pitch
    Neel Shah
    25/03/2026, 14:55
  24. 32. Poster Pitch
    Serena Giardino
    25/03/2026, 14:57
  25. 33. Poster Pitch
    Angus Macdonald
    25/03/2026, 14:59
  26. 34. Poster Pitch
    Antonio Najera
    25/03/2026, 15:01
  27. 35. Poster Pitch
    Saba Rahimy
    25/03/2026, 15:03
  28. 36. Poster Pitch
    Giulia Borghetto
    25/03/2026, 15:05
  29. 28. Poster Pitch
    Sinah Legner
    25/03/2026, 15:08
  30. 11. Redshifts and physical properties of KiDS-1000 galaxies using the pop-cosmos galaxy population model
    Anik Halder (University of Cambridge)
    25/03/2026, 15:40

    Accurate redshift estimation and physically motivated source sample selection are central challenges for precision weak lensing cosmology. In this talk, I will present our recent work on inferring physical properties of weak lensing galaxies in the Kilo-Degree Survey (KiDS-1000) using a generative model for the galaxy population. The framework enabling this work is pop-cosmos, a calibrated...

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  31. 12. Constraining Momentum Exchange in the Dark Sector
    Nathan Cruickshank (University of Portsmouth)
    25/03/2026, 16:00

    Interactions between dark energy and dark matter offer a potential solution to cosmological tensions. Specifically, models characterised by pure momentum exchange have been suggested to alleviate the S8 tension, as they lead to a suppression in structure growth rate at late times. In this talk, I will discuss how the choice of dark energy model impacts the ability of future data releases to...

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  32. 13. Empirical dark matter halo profiles from weak lensing
    Alicia Martin (Univerity of Oxford)
    25/03/2026, 16:20

    The structure of dark matter haloes is often described by radial density profiles motivated by cosmological simulations. These are typically assumed to have a fixed functional form (e.g. NFW), with some free parameters that can be constrained with observations. However, relying on simulations has the disadvantage that the resulting profiles depend on the dark matter model and the baryonic...

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  33. 14. Searching for Cosmic (Super)strings in the CMB and the Stochastic Gravitational-Wave Background
    Juhan Raidal (University of Nottingham)
    25/03/2026, 16:40

    Cosmic strings were once considered a leading candidate for the origin of cosmic structure, but high-resolution measurements of the cosmic microwave background (CMB) have ruled them out as the primary source of density fluctuations. Nevertheless, there remains ample room within the ΛCDM framework for the existence of cosmic strings or superstrings at subdominant levels. As these networks...

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