# All Upcoming Events

On Thursday, October 30, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Valery Rubakov (Institute for Nuclear Research)

Towards creating a universe in the laboratory

On Thursday at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

Roberto Valandro (ICTP Trieste)

De Sitter flux vacua with moduli stabilisation and chiral matter

On Friday at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Valery Rubakov (Russian Academy of Sciences)

The Universe before the hot Big Bang

On Friday at 16:15 in Martin Wood Lecture Theatre, Clarendon Laboratory, a seminar in
the Colloquia series:

Professor Bernard Silverman (Chief Scientist, The Home Office)

Science in Whitehall

On Monday at 12:00 in L5, a seminar in
the String Theory series:

Heng- Yu Chen (National Taiwan University and Cambridge)

Surface Defects and Dualities in Supersymmetric Gauge Theories

**Further information:**I will begin by introducing different surface defects in 4d N=2 supersymmetric gauge theories, and discuss how the 4d supersymmetry breaking effect can descend into the 2d world volume theories of the surface defects. I will then discuss how certain surface defects can naturally appear as saddle point solutions in 4d N=1 and N=2 superconformal indices, also confirm this with explicit 2d elliptic genus calculations. I will wrap up the talk by discussing their roles in different field theoretic dualities.

On Monday at 14:15 in L5, a seminar in
the Geometry and Analysis series:

Markus Roeser (Hannover)

Hyperkähler Implosion and Nahm's Equations

On Tuesday at 12:00 in L5, a seminar in
the Relativity series:

Niklas Beisert ((ETH) Zurich)

TBA

On Tuesday at 14:00 in 501, DWB (Seminar Room), a seminar in
the Holography series:

Mike Blake (DAMTP, Cambridge)

Holographic Transport and the Hall Angle

On Tuesday at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Akram Alishahi (Bonn)

Cobordisms between tangles

**Further information:**In a previous work, we introduced a refinement of Juhasz’s sutured Floer homology, and constructed a minus theory for sutured manifolds, called sutured Floer chain complex. In this talk, we introduce a new description of sutured manifolds as “tangles” and describe a notion of cobordism between them. Using this construction, we define a cobordism map between the corresponding sutured Floer chain complexes. We also discuss some possible applications. This is a joint work with Eaman Eftekhary.

On Thursday at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Juan Rojo (University of Oxford)

Boosting Strong Higgs Pair Production at the LHC

On Thursday at 13:30 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Greg Berczi

Invariants for non-reductive group actions (COW seminar)

On Thursday, November 6, at 14:45 , a seminar in
the Algebraic and Symplectic Geometry series:

Damiano Testa (Warwick)

K3 surfaces arising from arithmetic questions (COW seminar)

On Thursday, November 6, at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

Assaf Ben-David (NBI Copenhagen)

Large-scale anomalies in the CMB

On Thursday, November 6, at 17:00 in L5, a seminar in
the Algebraic and Symplectic Geometry series:

Tyler Kelly (Cambridge)

Derived equivalences of toric mirror constructions (COW seminar)

On Friday, November 7, at 16:15 in Martin Wood Lecture Theatre, Clarendon Laboratory, a seminar in
the Colloquia series:

Professor Steven Balbus, Savilian Professor of Astronomy (University of Oxford)

A Physicist's View of the Emergence of Terrestrial Vertebrates

On Monday, November 10, at 12:00 in L5, a seminar in
the String Theory series:

Tomasz Lukowski (Oxford)

Lessons from crossing symmetry at large N

**Further information:**In this talk I will discuss how to construct all solutions consistent with crossing symmetry in the limit of large central charge c ~ N^2, starting from the four-point correlator of the stress tensor multiplet in N=4 SYM. Unitarity forces the introduction of a scale \Delta_{gap} and these solutions organize as a double expansion in 1/c and 1/\Delta_{gap}. These solutions are valid to leading order in 1/c and to all orders in 1/\Delta_{gap} and reproduce, in particular, instanton corrections previously found. Comparison with such instanton computations allows to fix \Delta_{gap}. Using this gap scale one can explain the upper bounds for the scaling dimension of unprotected operators observed in the numerical superconformal bootstrap at large central charge. Furthermore, I will present connections between such upper bounds and positivity constraints arising from causality in flat space and I will discuss how certain relations derived from causality constraints for scattering in AdS follow from crossing symmetry.

On Monday, November 10, at 14:15 in L5, a seminar in
the Geometry and Analysis series:

Marco Gualtieri (Toronto)

TBA

On Tuesday, November 11, at 12:00 in L5, a seminar in
the Relativity series:

Oliver Schlotterer (AEI Golm)

One-loop SYM amplitudes from BRST symmetry

On Tuesday, November 11, at 14:00 in 501, DWB (Seminar Room), a seminar in
the Holography series:

Roberto Emparan (U. Barcelona)

Black Holes in the 1/D Expansion

On Tuesday, November 11, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Brent Doran (ETH Zurich)

TBA

On Thursday, November 13, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Shankha Banerjee (Harish-Chandra Research Institute)

A Higgs or The Higgs? : A look at anomalous Higgs couplings

On Thursday, November 13, at 14:00 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Kai Cieliebak (Augsburg)

The topology of rationally and polynomially convex domains

**Further information:**Rationally and polynomially convex domains in ${\mathbb C}^n$ are fundamental objects of study in the theory of functions of several complex variables. After defining and illustrating these notions, I will explain joint work with Y.Eliashberg giving a complete characterization of the possible topologies of such domains in complex dimension at least three. The proofs are based on recent progress in symplectic topology, most notably the h-principles for loose Legendrian knots and Lagrangian caps.

On Thursday, November 13, at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

UK HEP Forum (Cosener's House, Abingdon)

*No seminar today*

**Further information:**http:/

On Friday, November 14, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Paul Fendley (Oxford)

What is topological order, and why is it interesting?

On Friday, November 14, at 16:15 in Martin Wood Lecture Theatre, Clarendon Laboratory, a seminar in
the Colloquia series:

Professor Eric Wolff (Department of Earth Sciences, University of Cambridge)

Ice Cores, Climate and Sea Ice

**Further information:**[url=/sites/default/files/2013-10-17/wolff_colloquia_poster_14th_nov_2014_pdf_33588.pdf]Prof Eric Wolff colloquium 14 Nov 2014[/url]

On Monday, November 17, at 12:00 in L5, a seminar in
the String Theory series:

Paul Richmond (Oxford)

TBA

On Monday, November 17, at 14:15 in L5, a seminar in
the Geometry and Analysis series:

Andras Szenes (Geneva)

The Horn inequalities and tropical analysis

**Further information:**I will report on recent work on a tropical/symplectic approach to the Horn inequalities. These describe the possible spectra of Hermitian matrices which may be obtained as the sum of two Hermitian matrices with fixed spectra. This is joint work with Anton Alekseev and Maria Podkopaeva.

On Tuesday, November 18, at 12:00 in L5, a seminar in
the Relativity series:

Dr Leron Borsten (Imperial College London)

TBA

On Tuesday, November 18, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Jim Bryan (University of British Columbia)

TBA

On Thursday, November 20, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Alexander Mitov (University of Cambridge)

TBA

On Thursday, November 20, at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

Alexander Mitov (Cavendish Laboratory, Cambridge)

Top production at NNLO

On Friday, November 21, at 16:15 in Martin Wood Lecture Theatre, Clarendon Laboratory, a seminar in
the Colloquia series:

Professor Ray Monk (Department of Philosophy, University of Southampton)

Oppenheimer. Title tbc

On Friday, November 21, at 16:30 in L4, a seminar in
the Math Colloquium series:

Samson Abramsky (Dept of Computer Science - University of Oxford)

The Mathematics of Non-Locality and Contextuality

**Further information:**Quantum Mechanics presents a radically different perspective on physical reality compared with the world of classical physics. In particular, results such as the Bell and Kochen-Specker theorems highlight the essentially non-local and contextual nature of quantum mechanics. The rapidly developing field of quantum information seeks to exploit these non-classical features of quantum physics to transcend classical bounds on information processing tasks. In this talk, we shall explore the rich mathematical structures underlying these results. The study of non-locality and contextuality can be expressed in a unified and generalised form in the language of sheaves or bundles, in terms of obstructions to global sections. These obstructions can, in many cases, be witnessed by cohomology invariants. There are also strong connections with logic. For example, Bell inequalities, one of the major tools of quantum information and foundations, arise systematically from logical consistency conditions. These general mathematical characterisations of non-locality and contextuality also allow precise connections to be made with a number of seemingly unrelated topics, in classical computation, logic, and natural language semantics. By varying the semiring in which distributions are valued, the same structures and results can be recognised in databases and constraint satisfaction as in probability models arising from quantum mechanics. A rich field of contextual semantics, applicable to many of the situations where the pervasive phenomenon of contextuality arises, promises to emerge.

On Monday, November 24, at 12:00 in L5, a seminar in
the String Theory series:

Mario Garcia Fernandez (ICMAT Madrid)

TBA

On Monday, November 24, at 14:15 in L5, a seminar in
the Geometry and Analysis series:

Vicky Hoskins (Freie Universität Berlin)

Stratifications for moduli of sheaves and quiver representations

On Tuesday, November 25, at 12:00 in L5, a seminar in
the Quantum Field Theory series:

Guo Chuan Thiang

to be announced

On Tuesday, November 25, at 14:00 in DWB 501 (Seminar Room), a seminar in
the Holography series:

Natalia Pinzani-Fokeeva (U. Amsterdam)

Effective Actions for Fluids from Holography and the Membrane Paradigm

On Tuesday, November 25, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Julius Ross (Cambridge)

TBA

On Thursday, November 27, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Gudrun Heinrich & Chris Hays (University of Durham & University of Oxford)

TBA

On Thursday, November 27, at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

Gudrun Heinrich (Max-Planck-Institut fuer Physik, Munich)

High precision calculations for LHC phenomenology

On Friday, November 28, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Asimina Arvanitaki (Perimeter Institute)

tba

On Friday, November 28, at 16:00 in Martin Wood Lecture Theatre, Clarendon Laboratory, a seminar in
the Colloquia series:

Professor Alessandro Morbidelli (Observatoire de la Cte d'Azur, Nice)

The Formation of Terrestrial Planets

On Monday, December 1, at 12:00 in L5, a seminar in
the String Theory series:

Dmytro Volin (Trinity College Dublin)

TBA

On Monday, December 1, at 14:15 in L5, a seminar in
the Geometry and Analysis series:

Philip Candelas (Oxford)

TBA

On Tuesday, December 2, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Jorgen Rennemo (Imperial College London)

TBA

On Thursday, December 4, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Fady Bishara (University of Cincinnati)

Dark matter and flavor

On Thursday, December 4, at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

Owe Philipsen (Goethe University Frankfurt)

Heavy dense QCD and nuclear matter on the lattice

On Friday, December 5, at 16:15 in Martin Wood Lecture Theatre, Clarendon Laboratory, a seminar in
the Colloquia series:

Dr Asimina Arvanitaki (The Perimeter Institute of Theoretical Physics, Ontario)

Discovering New Forces and Matter with Atoms and Clocks

On Friday, February 6, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Michelangelo Mangano (CERN)

tba

On Friday, February 20, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Marc Bathelemy (CEA-IPhT)

tba

On Friday, February 27, at 16:30 in L1, a seminar in
the Math Colloquium series:

Martin Hairer (University of Warwick)

Taming infinities

**Further information:**Some physical and mathematical theories have the unfortunate feature that if one takes them at face value, many quantities of interest appear to be infinite! Various techniques, usually going under the common name of “renormalisation” have been developed over the years to address this, allowing mathematicians and physicists to tame these infinities. We will tip our toes into some of the mathematical aspects of these techniques and we will see how they have recently been used to make precise analytical statements about the solutions of some equations whose meaning was not even clear until recently.

On Friday, March 6, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Charlie Marcus (Copenhagen)

tba

On Friday, May 15, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Pasquale Blasi (INAF)

tba