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| Jan 27 |
Mon |
Remi Chauvin (Université de Toulouse) |
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| 15:00 |
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Theory tea (Chemistry): Mathematics on the scent of aromaticity
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G14 Dainton |
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| Jan 29 |
Wed |
Gulio Del Zanna (Cambridge) |
Plasma Dynamics Group |
| 12:00 |
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Improved atomic models to interpret the solar radiation emitted from the transition region and chromosphere
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Hicks Seminar Room J11 |
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Abstract:
We have long-standing issues and discrepancies between predicted and observed emissions. In the solar transition region and chromosphere, some are due to the inherent limitations of the physical models, but some are due to simplified atomic models.
We developed improved modelling of the ion balance, including physical effects which occur all the time and made them available via the CHIANTI v.11. I will briefly describe them and show how they improve the comparisons with observations of the Sun and other stars, with very simple 1D static atmospheric models. I will then describe current models we are developing to explain some chromospheric lines, and the plans to include other effects such as photo-ionization.
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| Jan 29 |
Wed |
Heath Pearson (Nottingham) |
ShEAF: postgraduate pure maths seminar |
| 16:00 |
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The generalised Mukai conjecture for spherical varieties |
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Hicks Seminar Room J11 |
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Abstract:
The generalised Mukai conjecture (GMC) concerns the characterisation of powers of projective space among Fano varieties. In this talk, we will prove the GMC for spherical varieties. These varieties generalise toric varieties, and their geometry may be interpreted combinatorially via a 'spherical dictionary'. If time permits, we will explain how this result can be extended to prove a purely combinatorial smoothness criterion for spherical varieties.
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| Jan 30 |
Thu |
Alex Pietrow (Leibniz Institute for Astrophysics Potsdam - AIP, Germany) |
SP2RC/ESPOS seminar |
| 10:00 |
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Sun-as-a-star flare observations with HARPS-N and SST
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Zoom |
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Abstract:
Stellar flares cannot be spatially resolved, which means that we have to extract complex three-dimensional behavior from a one-dimensional disk-integrated spectrum. Due to their proximity to Earth, solar flares can serve as a stepping stone for understanding their stellar counterparts, especially when using a Sun-as-a-star instrument in combination with spatially resolved observations. In this talk I will discuss a confined X2.2 flare and its eruptive X9.3 successor as measured by the HARPS-N Sun-as-a-star telescope. The behavior of multiple photospheric and chromospheric spectral lines are investigated by means of activity indices and contrast profiles, which are then related to physical processes directly observed in high-resolution observations made with the Swedish 1-meter Solar Telescope (SST). We further explore these relations by using the newly developed Numerical Sun-as-a-Star Integrator (NESSI) code to convert high-resolution SST flares to full disk spectra. Our findings suggest a relationship between the evolving shapes of the disk integrated spectra and the flare locations on the solar disk, which could be act as a guide for constraining flare locations in stellar spectra.
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| Jan 31 |
Fri |
Barworth Agriculture (https://www.kehubmaths.co.uk/triage-workshops/) |
Maths Knowledge Exchange Hub Triage Workshops |
| 10:00 |
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Soil sampling at a field scale for crop pests
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https://tinyurl.com/raxmyf4y |
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Abstract:
Potato cyst nematode (PCN) is an endemic pest found in potato growing regions around the world. Crucial agronomic management decisions are made pertaining to the establishment of a potato crop based on the results of a field survey for the pest. For each sample, current practice is to amalgamate around 40 soil cores collected in either a regular grid pattern or at randomised GPS points generated by a computer algorithm. The current recommended area for each composite sample is one hectare. Soil samples can be as small as 100g, and as PCN are very small (<1mm), they can easily be missed using industry standard sampling methods.
Our challenge is to improve soil sampling strategy such that more PCN is detected. One factor that could be considered is decreasing the sampling area (for example, from one hectare to a quarter hectare), but in practice, this option is not attractive to field owners since the cost for taking and processing a sample remains the same, independent of the area size. Ideally, we would like to understand the likelihood of retrieving the target organism when the diameter or number of cores taken per area is varied. Much work has been done on attempting to model the ‘typical’ field distribution of PCN, but unfortunately there is a wide range of environmental and biological factors that undermine any model based on real field distribution data. Instead, a matrix that compares the likelihood of detecting PCN based on theoretical population distributions would be helpful.
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| Feb 5 |
Wed |
Robert Rogers (Sheffield) |
ShEAF: postgraduate pure maths seminar |
| 16:00 |
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Moduli of Quiver Representations and GIT Quotients |
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Hicks Seminar Room J11 |
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Abstract:
In this talk we will discuss the notion of a quiver and its applications to algebraic geometry. In particular we will construct moduli spaces of quiver representations and stability conditions on quivers. We will show how to construct some simple GIT quotients from this data. Along the way Gabriel's theorem and Mumford's criterion will be covered.
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| Feb 6 |
Thu |
Spectral Sequences Reading Group |
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| 13:00 |
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Hicks Seminar Room J11 |
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| Feb 10 |
Mon |
Michael Wemyss (Glasgow) |
Algebraic Geometry Seminar |
| 14:00 |
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The classification of 3-fold flops
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Hicks Seminar Room J11 |
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Abstract:
I will overview the analytic classification of smooth, simple, 3-fold flops. There are three main aspects: (1) the theoretical advances that reduce the problem to classification of a certain class of noncommutative finite dimensional algebras, (2) a complete understanding of those algebras, then lastly (3) building the associated geometry for each algebra in that class. In the process of proving these results, we also obtain various bonus (and very surprising) geometric corollaries, including to curve-counting invariants, and also to 3-fold crepant divisor-to-curve contractions.
Part (1) is joint with Joe Karmazyn and Emma Lepri, the remainder is joint with Gavin Brown.
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| Feb 11 |
Tue |
Fraser Sparks (Nottingham) |
ShEAF: postgraduate pure maths seminar |
| 16:00 |
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A (very) brief introduction to motives
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Hicks Seminar Room J11 |
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Abstract:
(Co)homology theories are ubiquitous throughout pure mathematics. Can we find some objects which `capture’ the (co)homological behaviour of our spaces of interest? In algebraic geometry, the answer is the theory of motives. They allow one to use topological methods in the context of algebraic geometry, and can be thought of as a `universal cohomology theory’ for varieties. In this talk I will give a brief introduction to the theory, highlighting the analogies with topology, and I’ll also discuss some applications.
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| Feb 12 |
Wed |
TBA |
HK Days |
| 14:00 |
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Hicks Seminar Room J11 |
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| Feb 12 |
Wed |
Lei Zu (NCBJ Warsaw) |
Cosmology, Relativity and Gravitation |
| 15:00 |
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Probing Dark Matter Non-gravitational Interactions with Weak Lensing Surveys
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F20 |
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Abstract:
Modern cosmological surveys, with their unprecedented precision, have established weak lensing as a powerful probe of the matter distribution in the universe, enabling us to test the nature of dark matter (DM) interactions. The talk will briefly introduce this topic and present our recent investigation of weak lensing constraints on DM interactions with baryons and neutrinos. We utilize cosmological N-body simulations to model the nonlinear evolution of structure formation on weak lensing scales (k ~ 0.1–1 h/Mpc). To efficiently explore the parameter space of cosmological models, we have developed a novel numerical method that facilitates the use of simulation results. Our analysis of DES Year 3 data reveals significant constraints on DM-proton scattering, improving upon previous constraints from cosmic microwave background (CMB) data by up to a factor of five. Furthermore, our analysis of cosmic shear data reveals an intriguing ~3σ hint of a non-vanishing DM-neutrino interaction, which strengthens similar previous findings in high-multipole CMB and Lyman-α forest data. We also discuss how this interaction could simultaneously ameliorate the persisting S8 tension.
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| Feb 12 |
Wed |
TBA |
HK Days |
| 15:30 |
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Hicks Seminar Room J11 |
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| Feb 12 |
Wed |
TBA |
HK Days |
| 17:00 |
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Hicks Seminar Room J11 |
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| Feb 13 |
Thu |
TBA |
HK Days |
| 09:30 |
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Hicks Seminar Room J11 |
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| Feb 13 |
Thu |
Jaroslav Dudík (Astronomical Institute of the Czech Academy of Sciences, ASU (CZ)) |
SP2RC/ESPOS seminar |
| 10:00 |
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Three dimensional magnetic reconnection: Theory and observations
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Zoom |
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Abstract:
In the recent decades, three-dimensional modelling of solar flares and eruptions has made a number of predictions that were subsequently indicated by high-resolution imaging observations. These include existence of magnetic reconnection geometries involving the erupting flux rope itself, which drifts as a result, and also the apparent slipping and slip-running motion of footpoints of individual reconnecting structures. In this talk, we will summarize the predictions of the MHD models as well as the corroborating evidence, with particular emphasis on recent observations of super-Alfvénic slippage of flare kernels.
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| Feb 13 |
Thu |
TBA |
HK Days |
| 11:00 |
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Hicks Seminar Room J11 |
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| Feb 13 |
Thu |
TBA |
HK Days |
| 14:00 |
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Hicks Seminar Room J11 |
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| Feb 13 |
Thu |
TBA |
HK Days |
| 15:30 |
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Hicks Seminar Room J11 |
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| Feb 13 |
Thu |
Igor Sikora (Krakow University of Economics) |
Topology Seminar |
| 16:00 |
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Hicks Seminar Room J11 |
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| Feb 13 |
Thu |
TBA |
HK Days |
| 17:00 |
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Hicks Seminar Room J11 |
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| Feb 14 |
Fri |
TBA |
HK Days |
| 09:15 |
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Hicks Seminar Room J11 |
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| Feb 14 |
Fri |
The Access Group (https://www.kehubmaths.co.uk/triage-workshops/) |
Maths Knowledge Exchange Hub Triage Workshops |
| 10:00 |
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Linkage of Hierarchical Data
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https://tinyurl.com/vzas23se |
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Abstract:
Suppose you wanted to match individuals in Dataset 1 to individuals in Dataset 2. The individuals in both datasets have various identifying features – first name, last name, email, phone number, address. These features may be missing in either set, and also may have errors or differences. There is no training data. Matching individuals between the two sets is a standard problem in data linkage, and there are various standard methods which may be rule based or probabilistic or some combination of the two.
Now consider that in addition, Datasets 1 and 2 record parent-child relationships between individuals. Again, the recorded relationships may be missing or incorrect. Also, of course, not all individuals are in both datasets, so a recorded parent-child relationship in Dataset 1 may be missing either the parent or the child (as well as of course the relationship) in Dataset 2, or vice versa.
What is the best way to incorporate this relationship data into either rule-based or probabilistic linkage?
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| Feb 14 |
Fri |
TBA |
HK Days |
| 10:30 |
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Hicks Seminar Room J11 |
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| Feb 14 |
Fri |
TBA |
HK Days |
| 12:00 |
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Hicks Seminar Room J11 |
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| Feb 18 |
Tue |
Jens Funke |
Number Theory seminar |
| 14:00 |
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Hicks Seminar Room J11 / Google Meet |
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| Feb 19 |
Wed |
Adam Smith (Sheffield) |
Cosmology, Relativity and Gravitation |
| 15:00 |
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Hicks Seminar Room J11 |
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| Feb 19 |
Wed |
Lily Bennett (Sheffield) |
ShEAF: postgraduate pure maths seminar |
| 16:00 |
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TBA |
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Hicks Seminar Room J11 |
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Abstract:
TBA
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| Feb 20 |
Thu |
Clover May (NTNU) |
Topology Seminar |
| 16:00 |
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Hicks Seminar Room J11 |
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| Feb 25 |
Tue |
Alex Torzewski |
Number Theory seminar |
| 14:00 |
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Hicks Seminar Room J11 / Google Meet |
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| Feb 26 |
Wed |
Jacob Thompson (Sheffield) |
Cosmology, Relativity and Gravitation |
| 15:00 |
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Hicks Seminar Room J11 |
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| Feb 26 |
Wed |
Jingxiang Ma (Sheffield) |
ShEAF: postgraduate pure maths seminar |
| 16:00 |
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TBA |
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Hicks Seminar Room J11 |
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Abstract:
TBA
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| Feb 27 |
Thu |
TBA (Max Planck Institute for Solar System Research, MPS (DE)) |
SP2RC/ESPOS seminar |
| 10:00 |
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TBA
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Zoom |
| |
Abstract:
TBA
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| Feb 28 |
Fri |
Datasparq (https://www.kehubmaths.co.uk/triage-workshops/) |
Maths Knowledge Exchange Hub Triage Workshops |
| 10:00 |
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TBA
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| Mar 4 |
Tue |
Various |
Probability in the North East |
| 08:00 |
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Hicks Seminar Room J11 |
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| Mar 4 |
Tue |
Various |
Probability in the North East |
| 09:00 |
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| Mar 5 |
Wed |
Benito Juárez Aubry (York) |
Cosmology, Relativity and Gravitation |
| 15:00 |
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Hicks Seminar Room J11 |
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| Mar 5 |
Wed |
Pierre-Louis Guillot (Sheffield) |
ShEAF: postgraduate pure maths seminar |
| 16:00 |
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TBA
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Hicks Seminar Room J11 |
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Abstract:
TBA
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| Mar 6 |
Thu |
Daniel Luckhardt (Sheffield) |
Topology Seminar |
| 16:00 |
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Hicks Seminar Room J11 |
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| Mar 12 |
Wed |
Laura Iacconi (Queen Mary) |
Cosmology, Relativity and Gravitation |
| 15:00 |
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Hicks Seminar Room J11 |
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| Mar 13 |
Thu |
TBA (University of Cambridge (UK)) |
SP2RC/ESPOS seminar |
| 10:00 |
|
TBA
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Zoom |
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Abstract:
TBA
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| Mar 18 |
Tue |
Elena Collacciani (Padova) |
Number Theory seminar |
| 14:00 |
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Hicks Seminar Room J11 / Google Meet |
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| Mar 19 |
Wed |
Jens Chluba (Manchester) |
Cosmology, Relativity and Gravitation |
| 15:00 |
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Hicks Seminar Room J11 |
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| Mar 20 |
Thu |
Andrew Fisher (Sheffield) |
Topology Seminar |
| 16:00 |
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Hicks Seminar Room J11 |
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| Mar 25 |
Tue |
Rose Berry (UEA) |
Number Theory seminar |
| 14:00 |
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Hicks Seminar Room J11 / Google Meet |
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| Mar 27 |
Thu |
TBA (Inter-University Centre for Astronomy and Astrophysics, IUCAA (IN)) |
SP2RC/ESPOS seminar |
| 10:00 |
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TBA
|
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Zoom |
| |
Abstract:
TBA
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| Apr 2 |
Wed |
Silvia Schiattarella (Nottingham) |
Cosmology, Relativity and Gravitation |
| 15:00 |
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Hicks Seminar Room J11 |
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| Apr 3 |
Thu |
Robert Rogers (Sheffield) |
Topology Seminar |
| 16:00 |
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Hicks Seminar Room J11 |
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| Apr 10 |
Thu |
TBA (University of Rome Tor Vergata, Solar Physics group (IT)) |
SP2RC/ESPOS seminar |
| 10:00 |
|
TBA |
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Zoom |
| |
Abstract:
TBA
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| Apr 11 |
Fri |
Whizz Education |
Maths Knowledge Exchange Hub Triage Workshops |
| 10:00 |
|
TBA
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| Apr 24 |
Thu |
TBA (Leibniz Institute for Solar Physics, KIS (DE)) |
SP2RC/ESPOS seminar |
| 10:00 |
|
TBA
|
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Zoom |
| |
Abstract:
TBA
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| Apr 29 |
Tue |
Jenny Roberts (Bristol) |
Number Theory seminar |
| 14:00 |
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Hicks Seminar Room J11 / Google Meet |
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| Apr 30 |
Wed |
Ben Briggs (Imperial College London) |
Pure Maths Colloquium |
| 14:00 |
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Hicks Seminar Room J11 |
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| Apr 30 |
Wed |
Hanyu Cheng (Sheffield & Shanghai Jiao Tong) |
Cosmology, Relativity and Gravitation |
| 15:15 |
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Hicks Seminar Room J11 |
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| May 1 |
Thu |
Michael Ching (Amherst) |
Topology Seminar |
| 16:00 |
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Hicks Seminar Room J11 |
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| May 6 |
Tue |
Miriam Norris (University of Manchester) |
Number Theory seminar |
| 14:00 |
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Hicks Seminar Room J11 / Google Meet |
|
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| May 7 |
Wed |
Atabey Kaygun (Istanbul Technical University) |
Pure Maths Colloquium |
| 14:00 |
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Hicks Seminar Room J11 |
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| May 7 |
Wed |
Sofie Ried (Sheffield) |
Cosmology, Relativity and Gravitation |
| 15:15 |
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Hicks Seminar Room J11 |
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| May 8 |
Thu |
TBA (University of Catania / Catania Astrophysical Observatory (IT)) |
SP2RC/ESPOS seminar |
| 10:00 |
|
TBA
|
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Zoom |
| |
Abstract:
TBA
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| May 14 |
Wed |
TBA |
Pure Maths Colloquium |
| 14:00 |
|
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Hicks Seminar Room J11 |
|
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| May 21 |
Wed |
Radha Kessar (University of Manchester) |
Pure Maths Colloquium |
| 14:00 |
|
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Hicks Seminar Room J11 |
|
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| May 22 |
Thu |
TBA (Instituto de Astrofísica de Andalucía, IAA (ES)) |
SP2RC/ESPOS seminar |
| 10:00 |
|
TBA
|
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Zoom |
| |
Abstract:
TBA
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| May 22 |
Thu |
Gregorie Marc (Radbound) |
Topology Seminar |
| 16:00 |
|
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Hicks Seminar Room J11 |
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| Jun 5 |
Thu |
TBA (Physikalisch-Meteorologisches Observatorium Davos, PMOD/WRC (CH)) |
SP2RC/ESPOS seminar |
| 10:00 |
|
TBA
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Zoom |
| |
Abstract:
TBA
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