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Claire Rigouzzo (King's College)3/25/26, 10:00 AM
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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Lisa Goh (University of Edinburgh/ Institute for Astronomy)3/25/26, 10:20 AM
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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Aya Ghaleb (Swansea University)3/25/26, 10:40 AM
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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Danièle Steer3/25/26, 11:30 AM
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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Gerald Barnert3/25/26, 12:20 PM
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Alexander Roskill3/25/26, 12:22 PM
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Lawrence Berry3/25/26, 12:24 PM
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Enrico Specogna3/25/26, 12:26 PM
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Aditya Verma3/25/26, 12:28 PM
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Zizang Qiu (Edinburgh University)3/25/26, 12:30 PM
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Laurens Smulders3/25/26, 12:32 PM
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Lorenzo Tranchedone3/25/26, 12:34 PM
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Haoyang Jin3/25/26, 12:36 PM
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Arthur Whyley3/25/26, 12:38 PM
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Joe Marshall (Durham University)3/25/26, 1:45 PM
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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Robson Christie (University of Portsmouth)3/25/26, 2:05 PM
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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Xing Li (Imperial College London)3/25/26, 2:25 PM
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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Callum Bell3/25/26, 2:45 PM
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Trevor Cheung3/25/26, 2:47 PM
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Marisol Jimenez Cruz3/25/26, 2:49 PM
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Olga Garcia Gallego3/25/26, 2:51 PM
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Wei-Ning Deng3/25/26, 2:53 PM
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Neel Shah3/25/26, 2:55 PM
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Serena Giardino3/25/26, 2:57 PM
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Angus Macdonald3/25/26, 2:59 PM
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Antonio Najera3/25/26, 3:01 PM
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Saba Rahimy3/25/26, 3:03 PM
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Giulia Borghetto3/25/26, 3:05 PM
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Sinah Legner3/25/26, 3:08 PM
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Anik Halder (University of Cambridge)3/25/26, 3:40 PM
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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Nathan Cruickshank (University of Portsmouth)3/25/26, 4:00 PM
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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Alicia Martin (Univerity of Oxford)3/25/26, 4:20 PM
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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Juhan Raidal (University of Nottingham)3/25/26, 4:40 PM
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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