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VERSION:2.0
PRODID:-//Centre for Mathematical Sciences - ECPv4.8.0.1//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Centre for Mathematical Sciences
X-ORIGINAL-URL:http://math-sciences.org
X-WR-CALDESC:Events for Centre for Mathematical Sciences
BEGIN:VEVENT
DTSTART;TZID=UTC+0:20190130T160000
DTEND;TZID=UTC+0:20190130T170000
DTSTAMP:20190217T122140
CREATED:20181112T072606Z
LAST-MODIFIED:20190114T113037Z
UID:3255-1548864000-1548867600@math-sciences.org
SUMMARY:Tobias Tsang (Edinburgh)
DESCRIPTION:Flavour physics in the $D_{(s)}$ and $B_{(s)}$ meson system \nAbstract:\nAfter a brief motivation\, I will present our (domain wall fermion) charm and bottom physics program. I will first focus on our very recent computation (arXiv:1812.08791) of SU(3) breaking ratios in the $D_{(s)}$ and $B_{(s)}$ meson systems and the ratios of CKM matrix elements $V_{cd}/V_{cs}$ and $V_{td}/V_{ts}$. I will then outline the current status of our wider heavy flavour phenomenology program in the charm and bottom sector. \n
URL:http://math-sciences.org/event/tobias-tsang-edinburgh/
LOCATION:Room 101\, 2-5 Kirkby Place\, Plymouth\, PL4 6DT\, United Kingdom
CATEGORIES:Seminars,Theoretical Physics
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BEGIN:VEVENT
DTSTART;TZID=UTC+0:20190206T160000
DTEND;TZID=UTC+0:20190206T170000
DTSTAMP:20190217T122140
CREATED:20181120T091050Z
LAST-MODIFIED:20190122T115640Z
UID:3271-1549468800-1549472400@math-sciences.org
SUMMARY:Aleksandr Nikolaev (Swansea)
DESCRIPTION:Lattice study of phase properties of cold dense quark matter\n\nThe phase diagram of QCD is of fundamental interest for high energy physics\, cosmology and astrophysics\, but at the present moment ab-initio calculations in the lattice QCD formalism at finite density are impossible. However\, in the regions of high temperature and small density or of high density and small temperature theories with SU(2) and SU(3) gauge groups with the presence of fundamental fermions are expected to have similar properties. SU(2) theory in lattice formulation does not possess a sign problem\, which makes computations at finite density possible. I will present results for the phase structure of lattice SU(2) QCD with two flavors of quarks at finite quark density and zero temperature. Interaction properties of quarks\, real-time inter-quark potential and the confinement/deconfinement transition will be examined. Our results indicate that in very dense matter the quark-gluon plasma is in essence a weakly interacting gas of quarks and gluons without a magnetic screening mass in the system\, sharply different from a QGP at large temperature. The talk is based on papers arXiv:1808.06466\, 1711.01869\, 1605.04090\, and recent results.\n
URL:http://math-sciences.org/event/aleksandr-nikolaev-swansea/
LOCATION:Room 101\, 2-5 Kirkby Place\, Plymouth\, PL4 6DT\, United Kingdom
CATEGORIES:Seminars,Theoretical Physics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC+0:20190213T140000
DTEND;TZID=UTC+0:20190213T150000
DTSTAMP:20190217T122140
CREATED:20181129T213947Z
LAST-MODIFIED:20190125T190714Z
UID:3316-1550066400-1550070000@math-sciences.org
SUMMARY:ZhiMin Xiao (University of Exeter)
DESCRIPTION:Title: Pupil Advantage Index as an Alternative to Subgroup Analysis in RCTs for Education \nAbstract:\nAnalyses of social interventions need to produce evidence that is relevant to different groups of people in a society. When such a group is not the target group of an intervention\, this is called subgroup analysis\, even when the group of interest is pre-specified prior to data collection. Amongst statisticians\, subgroup analysis is often regarded as a statistical malpractice\, as its findings are often underpowered\, unreliable\, and can be prone to overinterpretation at best\, or misleading at worst. Meanwhile\, researchers would be criticised for generating irrelevant evidence and accused of wasting research money if they do not conduct relevant subgroup analysis. As a result\, “they are damned if they do\, and damned if they don’t” (Petticrew et al.\, 2012). \nIn this study\, we estimated intervention effects for Free School Meal (FSM) pupils in English schools\, which is a pre-specified subgroup in most educational interventions funded by the Education Endowment Foundation (EEF) in England. Specifically\, we first ran a treatment-FSM interaction test in each and every outcome to see if the difference-in-effects is statistically significant between FSM and Non-FSM pupils. We then calculated separate effect sizes within the two subgroups. Finally\, we examined the p-values from the interaction tests and compared the overall effect sizes for both FSM and Non-FSM pupils with the two separate subgroup estimates. We found that conventional interaction tests can produce self-contradictory results. To help solve the problem\, we propose a new approach\, Pupil Advantage Index (PAI)\, as an alternative to subgroup analysis and apply it to real RCT data extracted from the EEF data archive. We demonstrate that PAI does not just indicate where an intervention worked and by how much in existing trials\, but it can also be utilised to optimise treatment recommendation for future interventions. \nKeywords: \nFree School Meal Pupils; Interaction Test; Prediction; Pupil Advantage Index; Randomised Controlled Trials; Subgroup Analysis \n
URL:http://math-sciences.org/event/zhimin-xiao-university-of-exeter/
LOCATION:Rolle 211
CATEGORIES:Seminars,Statistics and Data Science
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC+0:20190220T140000
DTEND;TZID=UTC+0:20190220T150000
DTSTAMP:20190217T122140
CREATED:20190124T140418Z
LAST-MODIFIED:20190125T191820Z
UID:3386-1550671200-1550674800@math-sciences.org
SUMMARY:Mario Cortina Borja (UCL)
DESCRIPTION:Title: Modelling numbers of births by day of the week in relation to onset of labour and mode of giving birth in England 2005–2014 \nMario Cortina Borja\, in collaboration with Professor Alison Macfarlane\, Ms Nirupa Dattani\, Dr Miranda Dodwell\, Mr Rod Gibson\, Dr Gill Harper\, Dr Peter Martin and Dr Mary Newburn \nAbstract \nMaternity care has to be available 24 hours a day\, seven days a week. It is known that obstetric intervention can influence the time of birth\, but no previous analysis at a national level in England has yet investigated in detail the ways in which the day and time of birth varies by onset of labour and mode of giving birth. We linked data from birth registration\, birth notification\, and Maternity Hospital Episode Statistics and analysed 5\,093\,615 singleton births in NHS maternity units in England from 2005 to 2014. We built statistical models to establish how patterns of timing of birth vary by onset of labour\, mode of giving birth and gestational age. We found that the timing of birth by time of day and day of the week varies considerably by onset of labour and mode of birth. These patterns have implications for midwifery and medical staffing. \n
URL:http://math-sciences.org/event/mario-cortina-borja-ucl/
LOCATION:Rolle 115
CATEGORIES:Seminars,Statistics and Data Science
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC+0:20190220T140000
DTEND;TZID=UTC+0:20190220T150000
DTSTAMP:20190217T122140
CREATED:20190128T180821Z
LAST-MODIFIED:20190211T173927Z
UID:3399-1550671200-1550674800@math-sciences.org
SUMMARY:Iñaki García-Etxebarría (University of Durham)
DESCRIPTION:The Dai-Freed theorem and anomalies\nThe Dai-Freed theorem provides a bridge between the theory of bordism and Quantum Field Theory (and more specifically\, anomalies). I will review how these two areas are related\, and then summarise some computations of bordism groups of classifying spaces of Lie groups and cyclic groups that we have performed recently\, which are of particular interest for applications to four dimensional physics. \n
URL:http://math-sciences.org/event/ignacio-garcia-etxebarria-university-of-durham/
LOCATION:Room 101\, 2-5 Kirkby Place\, Plymouth\, PL4 6DT\, United Kingdom
CATEGORIES:Pure Mathematics,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC+0:20190220T160000
DTEND;TZID=UTC+0:20190220T170000
DTSTAMP:20190217T122140
CREATED:20190114T112826Z
LAST-MODIFIED:20190214T145133Z
UID:3367-1550678400-1550682000@math-sciences.org
SUMMARY:Francesca Day (DAMTP)
DESCRIPTION:Axions and X-ray polarimetry. \nAxions are one of the best motivated extensions to the Standard Model\, both solving the strong CP problem and providing a natural dark matter candidate.\nX-Ray telescope observations have already placed world leading bounds on the axion-photon coupling by searching for axion-photon interconversion in the magnetic fields of galaxy clusters. However\, current X-ray telescopes are unable to exploit one of the most striking features of this effect: only photons polarised parallel to the background magnetic field mix with axions. This leads to distinctive polarisation signatures from astrophysical sources. The next generation of polarising X-ray telescopes could detect these signatures. I will discuss the opportunities and difficulties of detecting axions with X-ray polarimetry. \n
URL:http://math-sciences.org/event/francesca-day-damtp/
LOCATION:Room 101\, 2-5 Kirkby Place\, Plymouth\, PL4 6DT\, United Kingdom
CATEGORIES:Seminars,Theoretical Physics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC+0:20190222T150000
DTEND;TZID=UTC+0:20190222T160000
DTSTAMP:20190217T122140
CREATED:20190208T121923Z
LAST-MODIFIED:20190212T084709Z
UID:3408-1550847600-1550851200@math-sciences.org
SUMMARY:Omar Kidwai (Toronto)
DESCRIPTION:Higher length-twist coordinates for character varieties.\nWe describe joint work with L. Hollands on a construction of special holomorphic Darboux coordinates on certain SL_N (particularly N=2\,3) character varieties. We consider degenerate examples of “spectral networks” of Gaiotto-Moore-Neitzke (certain graphical objects on a Riemann surface)\, generalizing the so-called “Fenchel-Nielsen” networks of Hollands-Neitzke. We compute the associated “spectral coordinates” using the “abelianization map”\, taking connections on the Riemann surface to abelian holonomy data on a spectral cover\, generalizing the “complexified Fenchel-Nielsen” coordinates of Kourouniotis-Tan for SL(2)-connections to higher rank. Time permitting\, I will discuss some physical applications to computing superpotentials coming from 4d N=2 supersymmetric QFTs. \n
URL:http://math-sciences.org/event/omar-kidwai-toronto/
LOCATION:Room 101\, 2-5 Kirkby Place\, Plymouth\, PL4 6DT\, United Kingdom
CATEGORIES:Pure Mathematics,Seminars
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