Round Table on New Avenues in Particle Cosmology

20 May 2025, 13:00 → 22 May 2025, 17:30 Europe/London

Winchester Guildhall

Pasquale Di Bari

International workshop on topics at the forefront of research in particle cosmology. It will consist of ~30 invited plenary talks and forum discussions. Attendance is by invitation only (there is no conference fee). The workshop is sponsored by the Royal Society and University of Southampton.

Please beware of scam e-mails attempting to offer you to book accommodation. The only reliable communications are those that come directly from the organisers.  In "Accommodation" you can find a list of hotels in Winchester. You should book directly from their official web page. If you need an accommodation in London, please let us know and we will provide you some advice.

                                         

                                               Arthurian Round Table in Winchester Great Hall

Tuesday 20 May

13:45 → 14:00 Opening

Convener: Pasquale Di Bari

WORKSHOP_PRESENTATION.pdf

13:45 Presentation

Speaker: Pasquale Di Bari

WORKSHOP_PRESENTATION.pdf

14:00 → 15:30 Afternoon Session

Convener: Pasquale Di Bari

14:00 Cosmological Battlegrounds: Hubble Tension, Evolving Dark Energy, and Neutrinos

Speaker: Dr William Giare

Giare_Winchester_2025.pdf

14:30 KiDS-Legacy: Cosmological constraints from cosmic shear with the complete Kilo-Degree Survey

Speaker: Benjamin Stölzner

KiDS_Legacy_winchester.pdf

15:00 Updates on 21-cm cosmology

Speaker: Anastasia Fialkov

Fialkov_talk.pdf

15:30 → 16:00 Coffee Break

16:00 → 17:30 Afternoon Session

Convener: Julia Hartz

16:00 LuSEE-Night: a pathfinder radio telescope to the far side of the Moon

Speaker: Prof. Anze Slosar

16:30 CP sources in electroweak baryogenesis

Speaker: Dr Graham White

Winchester_Graham.pdf

17:00 High Scale Baryogenesis

Speaker: Dr Chee Sheng Fong

Fong_Winchester_2025.pdf

17:30 → 19:30 Reception

Wednesday 21 May

09:00 → 10:30 Morning Session

Convener: P. Daniel Meerburg

09:00 CMB spectral distortions: A probe of dark photons (and beyond!)

Speaker: Dr Bryce Cyr (Massachusetts Institute of Technology)

Winchester-ADP-Distortions-Bryce.pdf

09:30 CMB Experiments at the Teide Observatory: Current Status and Future Prospects

Speaker: Prof. Jose Alberto Rubiño-Martin (IAC)

QUIJOTE-TMS-Winchester-May2025.pdf

10:00 PBH formation from a first-order phase transition in perturbative reheating

Speaker: Dr Wen-Yuan Ai

PBH-WenyuanAi.pdf

10:30 → 11:00 Coffee Break

11:00 → 12:30 Morning Session

Convener: Chee Sheng Fong

11:00 Black Holes as Ultralight Boson Concentrators

Speaker: Dr Yifan Chen (Niels Bohr International Academy)

UKSA_21May25_SGP.pdf

11:30 Testable GWs via GUT phase transition during inflation

Speaker: Ye-Ling Zhou (Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences)

YLZ_Winchester2505.pdf

12:00 Quasi-Dirac Neutrinos

Speaker: Prof. Bhupal Dev (Washington University in St. Louis)

dev_Winchester.pdf

dev_Winchester.pdf

dev_Winchester.pptx

12:30 → 14:00 Lunch Break

14:00 → 15:00 Afternoon Session

Convener: Bhupal Dev

14:00 Advancing Standards in Early Universe Physics: The Impact of Bound States and Thermal Effects

Speaker: Dr Julia Harz

WorkshopWinchester2025.pdf

14:30 Gravitational Waves and Laboratory Searches as Complementary Probes of Right-handed Neutrinos

Speaker: Prof. Frank Deppisch

deppisch-winchester.pdf

15:00 → 15:30 Coffee Break

15:30 → 16:30 Afternoon Session

Convener: Frank Deppisch

15:30 Neutrino Oscillation Landscape: Status of 3ν Mixing and Short-Baseline Anomalies

Speaker: Dr Ivan Martinez-Soler

Talk_IMS.pdf

16:00 Quantum Universe and Neutrinos: Probing New Frontiers

Speaker: Prof. Heinrich Päs (TU Dortmund)

16:30 → 16:50 Round Table Discussion

Convener: Pasquale Di Bari

17:00 → 19:00 Cultural event: GREAT HALL

19:00 → 23:00 Social Dinner

Thursday 22 May

09:00 → 10:30 Morning Session

Convener: Anastasia Fialkov

09:00 How smooth is the radio sky?: the excess anisotropy of the radio background

Speaker: Fraser Cowie

How smooth is the radio sky_ Fraser- Winchester.pdf

09:30 Primordial non-Gaussianities: What are they, why do we care, and how do we measure them

Speaker: Prof. Daniel Meerburg

Winchester .key

10:00 Seeking the Elusive Axion Decay into Photons

Speaker: Dr Elisa Todarello

talk_Todarello.pdf

10:30 → 11:00 Coffee Break

11:00 → 12:30 Morning Session

Convener: Ye Ling Zhou

11:00 Is the PTA stochastic gravitational wave background originating from Super- massive Black Hole mergers or from the Early Universe?

Speaker: Francesco Shankar

RoundTable_Talk_FS_2025.pdf

RoundTable_Talk_FS_2025.ppt

11:30 Constraints on the nature of Dark Energy from the abundance of High Redshifts Galaxies and AGNs

Speaker: Nicola Menci

12:00 Probing the nature of dark matter with stellar streams

Speaker: Denis Erkal

round_table_erkal.key

12:30 → 14:00 Lunch Break

14:00 → 15:30 Afternoon Session

Convener: Ivan Martinez-Soler

14:00 Gravitational microlensing with dark matter structures

Speaker: Dr Djuna Croon

Winchester25Djuna.pdf

14:30 Decoding Dark Matter: Complementary Probes from Colliders to Non-Collider Experiments

The nature of Dark Matter remains one of the deepest mysteries in particle physics and cosmology. While astrophysical and cosmological observations unambiguously confirm its existence, only its gravitational interaction has been established experimentally. Key properties of Dark Matter -- such as its mass, spin, stabilising symmetry, and non-gravitational couplings -- remain unknown.

This talk explores how complementary approaches at collider and non-collider experiments can shed light on the particle nature of Dark Matter. To facilitate this exploration, a systematic classification of Dark Matter candidates based on the spin of Dark Matter and mediators, as well as their electroweak hypercharge and isospin, will be discussed.

Going beyond Standard Model gauge symmetries, the Fermionic Portal Vector Dark Matter model will be presented. This framework features dark SU(2) gauge sector and has important implications for relic density, direct and indirect detection signals, and collider phenomenology, including novel signatures.

New directions in collider-based Dark Matter searches -- beyond the standard mono-X paradigm -- will also be highlighted. These include multi-lepton signatures and disappearing tracks. The talk will demonstrate how kinematic observables, such as invariant mass, missing transverse momentum, and angular distributions, can help differentiate between models and reveal information about the spin and interaction structure of Dark Matter. These collider signatures offer complementary sensitivity to non-collider experiments and provide a promising strategy for decoding the true nature of Dark Matter.

Speaker: Prof. Alexander Belyaev

Belyaev-Winchester-Round-Table-2025-decoding-DM.pdf

15:00 Levitated mechanical detectors of Dark Matter

Speaker: Hendrik Ulbricht

DM detction - Winchester May 2025-Hendrick.pdf

15:30 → 16:00 Coffee Break

16:00 → 17:00 Afternoon Session

Convener: Rishav Roshan + Xin Wang

16:00 Experimental Frontiers in 21cm Cosmology and Radio Synchrotron Background Studies

Speaker: Akshatha Vydula

16:30 Relaxing BBN constraints on Heavy Neutral Leptons with Axion-Like Particles

Speaker: Dr Chayan Majumdar

Chayan_Winchester.pdf

17:00 → 17:30 Round Table Discussion