Meetings Archive

CMI-HIMR Summer School on Probabilistic Group Theory

Hosted by: School of Mathematics, Fry Building, University of Bristol, UK

Jointly funded by the Clay Mathematics Institute and the Heilbronn Institute for Mathematical Research.

In recent years, probabilistic methods have been at the heart of many spectacular advances in group theory and related areas, finding a diverse range of applications. This summer school will introduce a wide audience of graduate students and early career researchers to some of the most exciting recent developments. The programme will feature four short courses from world-leading experts in the area, together with tutored problem sessions for participants.

 

More information on the summer school website

Applications are now open, please apply here. The application deadline is 24th February 2023, 23:59 GMT.

Confirmed lecturers:

Martin Liebeck (Imperial College London)

Cheryl Praeger (University of Western Australia)

Aner Shalev (Hebrew University of Jerusalem)

Pham Huu Tiep (Rutgers University)

Guest lecturers:

Emmanuel Breuillard (Oxford)

Ben Green (Oxford)

Colva Roney-Dougal (St Andrews)

 


Applications are now open, please apply here. The application deadline is 24th February 2023, 23:59 GMT.

If you have any questions, please contact heilbronn-coordinator@bristol.ac.uk. Visit the summer school’s event website for further information.

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Fry Conference Series: New Perspectives in Pure Mathematics

This is the last in a series of conferences being held to celebrate the move of the School of Mathematics at the University of Bristol to the recently refurbished Grade II listed Fry Building at the heart of the university campus.

Taking place over three days (in the Fry Building), this international conference features a distinguished line-up of speakers, covering a range of recent advances in number theory, combinatorics, algebra, geometry and logic.

Visit the event website to view the programme and to register.

Organisers:

David Ellis (Bristol)
Céline Maistret (Bristol)

Scientific committee:

David Ellis (Bristol) – Combinatorics section
Kentaro Fujimoto (Bristol) – Logic section
John Mackay (Bristol) – Geometry section
Céline Maistret (Bristol) – Number Theory section
Jeremy Rickard (Bristol) – Algebra section

Confirmed Speakers:

Andrew Granville (Montréal)*
Ben Green (Oxford)
Scott Harper (St Andrews)
Alessandra Iozzi (ETH Zurich)
Franziska Jahnke (Muenster)
Tali Kaufman (Bar-Ilan)
Autumn Kent (Wisconsin)
Jungwon Lee (Warwick)
Shoham Letzter (UCL)
Menachem Magidor (Jerusalem)
Irene Pasquinelli (Bristol)
Ross Paterson (Bristol)
Michael Rathjen (Leeds)
Aner Shalev (Jerusalem)
Donna Testerman (EPFL)

*online talk

 

Visit the event website to view the programme and to register.

 


We are very grateful indeed for financial support from the Heilbronn Institute for Mathematical Sciences, the London Mathematical Society and the Clay Mathematics Institute.

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Random matrices from quantum chaos to the Riemann zeta function. A celebration in honour of Jon Keating’s 60th birthday.

School of Mathematics, Fry Building, University of Bristol, UK

Random Matrix Theory (RMT) is ubiquitous in the mathematical and physical sciences because of its broad range of applications and its predictive power, which allow accurate calculations and asymptotic analysis that are not accessible through traditional techniques. The interdisciplinary nature of RMT is epitomized by Prof. Jon Keating’s career, which has been characterized by the rare ability of initiating new areas of research by bringing together areas of mathematics that on the surface have little in common. This conference will feature leading mathematicians working at the interface of quantum chaos, analytic number theory, probability and random matrix theory.

Organisers:
Emma Bailey (CUNY)
Tamara Grava (Bristol)
Francesco Mezzadri (Bristol)
Nina Snaith (Bristol)
Brian Winn (Loughborough)

Speakers:
Louis-Pierre Arguin (CUNY)
Emma Bailey (CUNY)
Michael Berry (Bristol)
Brian Conrey (AIM)
Neil O’Connell (UCD)
Persi Diaconis (Stanford)
Alexandra Florea (UC Irvine)
Yan Fyodorov (KCL)
Alice Guionnet (Lyon)
Alexander Its, (IUPUI)
Jens Marklof (Bristol)
Zeev Rudnick (Tel Aviv)
Peter Sarnak (Princeton)
Nick Simm (Sussex)
Kannan Soundararajan (Stanford)

 

Registration details coming soon.

 


We are very grateful indeed for financial support from the Heilbronn Institute for Mathematical Sciences, the American Institute of Mathematics, and the London Mathematical Society.

If you have any questions, please contact heilbronn-coordinator@bristol.ac.uk.

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Heilbronn Colloquium 2022: Pierre Del Moral

14 September 2022 at 16:00 – 17:00 We are delighted to welcome Professor Pierre Del Moral, INRIA at the University of Bordeaux, to the University of Bristol to deliver a Heilbronn Colloquium.

The colloquium with take place in Lecture theatre 2.41, Fry Building at 16:00 – 17:00 followed by a wine reception in the Fry Common Room.

Title: Stability of positive semigroups and their mean field interpretations

Abstract: This talk is concerned with the stability of positive semigroups and their mean field particle interpretations.

We present a stochastic interpolation methodology based on backward semigroup techniques to obtain sharp quantitative estimates uniformly with respect to the time parameter. The stability analysis discussed in this talk is based on the extension of V-norm contraction methods for Markov operators, to nonlinear normalized semigroups. In the context of unnormalized models, we also present extensions of Perron-Frobenius and Krein-Rutman theorems for positive operators to time-varying positive semigroups.

We illustrate the impact of these stochastic perturbation techniques in the context of diffusion Monte Carlo ground state calculation, Feynman-Kac branching particle interpretations as well as McKean-Vlasov interacting diffusions.

The talks will be held in-person only. Spaces are limited in the room, so we ask that you please register via this form if you are intending to come in person. Once capacity is reached, we will close registration and any current remaining spaces will be allocated on a first come basis.


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Compass Annual Conference 2022

We are excited to announce that we will be holding the first Compass Conference on Tuesday 13 September 2022, which will be hosted in the newly refurbished Fry Building, home to the School of Mathematics.

The conference will be a celebratory showcase of the achievements of Compass CDT’s students, supervisory teams, and collaborations with industrial partners.

The full programme will be announced in August and will include post presentations, lightening talks, and a special guest lecture.

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Understanding the Structure of Liquids: Celebrating John Enderby’s Scientific Legacy.

About the workshop:

This Workshop, organised by the Liquids and Complex Fluids Group and the Neutron Scattering Group of the Institute of Physics, will celebrate the scientific contributions of Sir John Enderby FRS (1931-2021).

John was a pioneer in using neutrons to study the structure of disordered matter. In 1966, together with Peter Egelstaff and David North, John introduced the technique of neutron scattering with isotopic substitution which advanced fundamental understanding of multicomponent liquids, including liquid alloys, glasses, liquid semiconductors and molten salts. Different isotopes scatter neutrons in different ways allowing the correlations between different species to be unravelled. This technique, and John’s ability to exploit it using newly developed neutron sources, proved enormously productive in determining the physics of a huge variety of liquid and glassy systems. An early application by John and colleagues determined how water molecules are ordered around ions in aqueous solutions- a major step forward in chemical physics. John was an inspirational research leader and an exceptional servant to the wider scientific community. He served with distinction as Physical Secretary of the Royal Society from 1999 to 2004 and as President of the Institute of Physics from 2004 to 2006.

The meeting will feature contributions from some of John’s former colleagues and students as well as talks on current research on the structure of liquids illustrating how John’s work and the techniques he developed influence the field.

Speakers include :  A. Barnes (Bristol) , J. Drewitt (Bristol), T. Headen (RAL)  J. Finney (UCL), P. Mason (Prague), H. Mohammadi (Bath), G. Neilson (Bristol) , R. Newport (Kent) , P. Salmon (Bath), A. Soper (RAL).

Please visit the main event website for the full programme and information on how to register.

Sir John Enderby leans over some scientific equipment and smiles warmly at the camera. He is an older white man with glasses, and looks happy and excited.

Sir John Enderby

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Heilbronn Colloquium 2022: Goulnara Arzhantseva

Wednesday 13th July 2022: 16.00 – 17.00

We are delighted to welcome Professor Goulnara Arzhantseva, University of Vienna, to the University of Bristol to deliver a Heilbronn colloquium.

The colloquium with take place in Lecture theatre 2.41, Fry Building at 16:00 – 17:00 followed by a wine reception in the Fry Common Room.

Title: Approximations of infinite groups

Abstract: We discuss various still open questions on approximations of finitely generated groups, focusing on finite-dimensional approximations such as residual finiteness and soficity. We survey our results on the existence and stability of metric approximations. We suggest a few conjectures, e.g. on Gromov hyperbolic groups and their infinite monster limits. The setting is rather general and the involved concepts are transversal to various areas of mathematics.

Based on joint works with Liviu Paunescu (Bucharest).

 

The talks will be held in-person only. Spaces are limited in the room, so we ask that you please register via this form if you are intending to come in person. Once capacity is reached, we will close registration and any current remaining spaces will be allocated on a first come basis.


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Heilbronn Colloquium 2022: Tara Javidi

Wednesday 22nd June 2022: 16.00 – 17.00

University of Bristol

We are delighted to welcome Professor Tara Javidi, University of California, San Diego, to the University of Bristol to deliver a Heilbronn colloquium.

Title: Black-box Optimization in Theory and in Practice

Abstract: In this talk, we will consider the problem of maximizing a black-box function via noisy and costly queries from a theoretical perspective (a lot of it) as well as applications (an exciting bit). We motivate the problem by considering a wide variety of engineering design applications from the heuristic optimization of wireless networks to hardware acceleration to neural network architecture search.

We consider the problem in two settings where the blackbox function belongs to 1) the sample paths of a Gaussian Process or 2) a reproducing kernel Hilbert space (RKHS) with bounded norm. These settings, despite their seeming differences, rely on a Gaussian Process Bandit (GP-Bandit) interpretation of the problem. As a result, in much of prior work query point selection rule involves a bandit search over a sufficiently fine sequence of uniform discretization of the input space. In contrast, and inspired by a geometric (hypothesis testing) interpretation of optimization of continuous functions, we propose and analyze a new family of algorithms which adaptively discretize and zoom in the optimality region, resulting in a lower computational complexity, particularly when the domain is a subset of a high dimensional Euclidean space. In addition to the computational gains, sufficient conditions are identified under which the regret bounds of the new algorithm either improve upon the known results or asymptotically match the lower bound.

We end the talk by considering two important natural questions to which we provide partial answers. In particular, we quantify a lower bound on the gains obtained from a first-order oracle who in addition to zero-order oracle has access to (noisy) gradient information. Last not least, we discuss the extension of the framework to account for an instance-dependent regret analysis.

This is joint work with my former PhD student Shekhar Shubhanshu.

 

The colloquium with take place in Lecture theatre LG.02, Fry Building at 16:00 – 17:00 followed by a wine reception in the Fry Common Room.

The talks will be held in-person only. Spaces are limited in the room, so we ask that you please register via this form if you are intending to come in person. Once capacity is reached, we will close registration and any current remaining spaces will be allocated on a first come basis.


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Heilbronn Seminar Series 2022: Sanjay Shakkottai

IMPORTANT DATE UPDATE!

Monday 20th June 2022: 11.00 – 12.30 & 14.00 – 15.30

Tuesday 21st June 2022: 11.00 – 12.30 & 14.00 – 15.30

Friday 1st July 2022: 13.30 – 15.00

University of Bristol

We are delighted to welcome Professor Sanjay Shakkottai, University of Texas at Austin, to the University of Bristol to deliver a Heilbronn Seminar Series.

Title: Short Course on Causal Inference.

Abstract: Read more.

 

The seminars with take place in Lecture theatre 2.41, Fry Building.

The talks will be held in-person only. Spaces are limited in the room, so we ask that you please register via this form if you are intending to come in person. Once capacity is reached, we will close registration and any current remaining spaces will be allocated on a first come basis.


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Bristol Sequential Learning Workshop

Workshop details:

The Bristol Sequential Learning workshop is a two-day event to be held on the 23 and 24 of June, 2022. The workshop will provide an opportunity to discuss a broad range of research in the field of Sequential Learning, including Multi-Armed bandits, Reinforcement Learning, Active Learning, Sequential Hypothesis Testing and Change-point Detection.

Invited Speakers

The workshop will include talks from the following invited speakers:

  • Steffen Grunewalder (University of Lancaster)
  • Tara Javidi (University of California, San Diego)
  • Varun Kanade (University of Oxford)
  • Daniel Kious (University of Bath)
  • Tor Lattimore (DeepMind)
  • Omar Rivasplata (UCL)
  • Sanjay Shakkottai (University of Texas at Austin)
  • Vladislav Tadic (University of Bristol)
  • Sam Tickle (University of Bristol)
  • Sofia Villar (University of Cambridge)

Organisers

Ayalvadi Ganesh and Henry Reeve

Contributions

In addition, we welcome contributions from participants in the form of posters or lightning talks (including open problems). If you would like to contribute, please send an email to a.ganesh@bristol.ac.uk including the title of your contribution and whether you prefer to present a lightning talk or a poster.

Registration:

Registration is now closed.

Workshop costs:

Workshop:

  • Early career researcher (PhD student or postdoc): £25
  • Established researcher (permanent post): £25

Conference dinner (optional) -Dinner booking is now closed.

Travel

Re. Railway strikes: We are aware that the upcoming rail strikes will fall across the conference dates and are likely to cause widespread disruption (see link for details re. strike dates and lines affected). Although a reduced timetable will still be running, we would advise that, where possible, conference attendees look into alternative methods of transport or travel the day before to avoid the disruption. Attendees unable to reach the conference due to the strikes can contact the organisers to organise a refund of their registration/dinner costs.  

Accommodation

For planning purposes the workshop will be located within the Fry Building, postcode BS8 1UG. Information on accommodation options can be found by visiting the Visit Bristol website. 

Funding and support

This conference is made possible through the generous support of the Heilbronn Institute for Mathematical Research (HIMR) and the UK Research Innovation/ Engineering and Physical Sciences Research Council (UKRI/EPSRC) Additional Funding Programme for Mathematical Sciences.
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