# All Upcoming Events

On Monday at 12:45 in L3, a seminar in
the String Theory series:

Fabian Ruehle (Oxford)

Dualities of Deformed N=2 SCFTs from torus knots and links

*We study D3 brane theories that are described as deformations of N=2 SCFTs. They arise at the self-intersection of a 7-brane in F-Theory. As we shall explain, the associated string junctions and their monodromies can be studied via torus knots or links. The monodromy reduces (potentially different) flavor algebras of dual deformations of N=2 theories and projects out charged states, leading to N=1 SCFTs. We propose an explanation for these effects in terms of an electron-monopole-dyon condensate.*

**Further information:**
On Monday at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Joel Fine (Universite Libre de Bruxelles)

The symplectic geometry of twistor spaces

*Twistor spaces were originally devised as a way to use techniques of complex geometry to study 4-dimensional Riemannian manifolds. In this talk I will show that they also make it possible to apply techniques from symplectic geometry. In the first part of the talk I will explain that when the 4-manifold satisfies a certain curvature inequality, its twistor space carries a natural symplectic structure. In the second part of the talk I will discuss some results in Riemannian geometry which can be proved via the symplectic geometry of the twistor space. Finally, if there is time, I will end with some speculation about potential future applications, involving Poincaré—Einstein 4-manifolds, minimal surfaces and distinguished closed curves in their conformal infinities*

**Further information:**
On Tuesday at 11:30 in BIPAC seminar room, a seminar in
the Cosmology series:

Andrew Tolley (Imperial College)

Constraints on Effective Field Theories for Cosmology

On Tuesday at 12:00 in L4, a seminar in
the Quantum Field Theory series:

Emery Sokatchev

POSTPONED

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

Vicky Hoskins (Freie Universität Berlin)

Group actions on quiver moduli spaces

*We consider two types of actions on moduli spaces of quiver representations over a field k and we decompose their fixed loci using group cohomology. First, for a perfect field k, we study the action of the absolute Galois group of k on the points of this quiver moduli space valued in an algebraic closure of k; the fixed locus is the set of k-rational points and we obtain a decomposition of this fixed locus indexed by the Brauer group of k. Second, we study algebraic actions of finite groups of quiver automorphisms on these moduli spaces; the fixed locus is decomposed using group cohomology and each component has a modular interpretation. If time permits, we will describe the symplectic and holomorphic geometry of these fixed loci in hyperkaehler quiver varieties. This is joint work with Florent Schaffhauser.*

**Further information:**
On Thursday at 12:45 in L6, a seminar in
the Strings Junior series:

Stefan Nekovar

ADHM

On Thursday at 13:00 in Dalitz Institute, a seminar in
the Dalitz Seminar in Fundamental Physics series:

Tommi Tenkanen (Helsinki Inst. of Physics)

Observational properties of feebly interacting dark matter

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**Further information:**
On Thursday at 16:00 in L6, a seminar in
the Number Theory series:

Otmar Venjakob (Heidelberg)

Wach modules, regulator maps, and ε-isomorphisms in families

*In this talk on joint work with REBECCA BELLOVIN we discuss the “local ε-isomorphism” conjecture of Fukaya and Kato for (crystalline) families of G_{Q_p}-representations. This can be regarded as a local analogue of the global Iwasawa main conjecture for families, extending earlier work of Kato for rank one modules, of Benois and Berger for crystalline representations with respect to the cyclotomic extension as well as of Loeffler, Venjakob and Zerbes for crystalline representations with respect to abelian p-adic Lie extensions of Q_p. Nakamura has shown Kato’s - conjecture for (ϕ,\Gamma)-modules over the Robba ring, which means in particular only after inverting p, for rank one and trianguline families. The main ingredient of (the integrality part of) the proof consists of the construction of families of Wach modules generalizing work of Wach and Berger and following Kisin’s approach via a corresponding moduli space.*

**Further information:**
On Thursday at 16:15 in Sciama Lecture Theatre, a seminar in
the Theoretical Particle Physics series:

Petr Horava (Berkeley)

Nonrelativistic naturalness, Aristotelian spacetime and the Higgs mass hierarchy

On Friday at 15:30 in Martin Wood Lecture Theatre, Clarendon Laboratory, Parks Road, Oxford, a seminar in
the Colloquia Series Seminars series:

Prof Tom McLeish (Durham University)

Learning new physics from a medieval thinker � Big Bangs and Rainbows

On Monday, February 27, at 12:45 in L3, a seminar in
the String Theory series:

Leron Borsten (Dublin IAS)

Twin supergravities from Yang-Mills squared

*We begin by reviewing the “Gravity = Gauge x Gauge” paradigm that has emerged over the last decade. In particular, we will consider the origin of gravitational scattering amplitudes, symmetries and classical solutions in terms of the product of two Yang-Mills theories. Motivated by these developments we begin to address the classification of gravitational theories admitting a “factorisation” into a product of gauge theories. Progress in this direction leads us to twin supergravity theories - pair of supergravities with distinct supersymmetries, but identical bosonic sectors - from the perspective of Yang-Mills squared.*

**Further information:**
On Monday, February 27, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Yng-Ing Lee (National Taiwan University (visiting Oxford))

Singularities of Lagrangian Mean Curvature Flow

*Mean Curvature Flow (MCF) is a canonical way to deform sub-manifolds to minimal sub-manifolds. It also improves the geometric properties of sub-manifolds along the flow. The condition of being Lagrangian is preserved for smooth solutions of MCF in a Kahler-Einstein manifold. We call it Lagrangian mean curvature flow (LMCF) when requires slices of the flow to be Lagrangian. Unfortunately, singularities may occur and cause obstructions to continue MCF in general. It is thus very important to understand the singularities, particularly isolated singularities of the flow. Isolated singularity models on soliton solutions that include self-similar solutions and translating solutions. In this talk, I will report some of my work with my collaborators on studying singularities of LMCF. It includes soliton solutions with different important properties and an in-progress joint project with Dominic Joyce that aims to understand how singularities form and construct examples to demonstrate these behaviours.*

**Further information:**
On Tuesday, February 28, at 11:30 in BIPAC seminar room, a seminar in
the Cosmology series:

Fabian Schmidt (MPA)

An overview of galaxy bias

On Tuesday, February 28, at 12:00 in L4, a seminar in
the Relativity series:

David Broadhurst (Open University)

TBA

On Tuesday, February 28, at 14:00 in DWB 501 (Seminar Room), a seminar in
the Holography series:

Wilke van der Schee (MIT)

Recent Holographic Heavy Ion Collisions: Jets and Hydrodynamisation

On Tuesday, February 28, at 15:45 , a seminar in
the Algebraic and Symplectic Geometry series:

Elisa Postinghel (Loughborough University)

Tropical compactifications, Mori Dream Spaces and Minkowski bases

*Given a Mori Dream Space X, we construct via tropicalisation a model dominating all the small Q-factorial modifications of X. Via this construction we recover a Minkowski basis for the Newton-Okounkov bodies of Cartier divisors on X and hence generators of the movable cone of X. This is joint work with Stefano Urbinati.*

**Further information:**
On Thursday, March 2, at 12:45 in L6, a seminar in
the Strings Junior series:

Anthony Ashmore

Rigid supersymmetry on curved spaces

On Thursday, March 2, at 13:00 in Dalitz Institute, a seminar in
the Dalitz Seminar in Fundamental Physics series:

Graham Ross (Oxford)

TBA

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**Further information:**
On Thursday, March 2, at 16:15 in L6, a seminar in
the Number Theory series:

Payman Kassaei (Kings College London)

TBA

On Thursday, March 2, at 16:15 in Sciama Lecture Theatre, a seminar in
the Theoretical Particle Physics series:

Mads Frandsen (CP3-Origins, Odense)

Dynamical electroweak symmetry breaking in light of LHC results

On Friday, March 3, at 16:00 in L1, a seminar in
the Math Colloquium series:

Ana Caraiani (University of Bonn)

Reciprocity laws and torsion classes

*The law of quadratic reciprocity and the celebrated connection between modular forms and elliptic curves over Q are both examples of reciprocity laws. Constructing new reciprocity laws is one of the goals of the Langlands program, which is meant to connect number theory with harmonic analysis and representation theory. In this talk, I will survey some recent progress in establishing new reciprocity laws, relying on the Galois representations attached to torsion classes which occur in the cohomology of arithmetic hyperbolic 3-manifolds. I will outline joint work in progress on better understanding these Galois representations, proving modularity lifting theorems in new settings, and applying this to elliptic curves over imaginary quadratic fields.*

**Further information:**
On Monday, March 6, at 12:45 in L3, a seminar in
the String Theory series:

Pietro Benetti-Genolini (Oxford)

TBA

On Monday, March 6, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Marcos Jardim (Campinas (visiting Edinburgh))

Moduli spaces of instanton sheaves on projective space

*Instanton bundles were introduced by Atiyah, Drinfeld, Hitchin and Manin in the late 1970s as the holomorphic counterparts, via twistor theory, to anti-self-dual connections (a.k.a. instantons) on the sphere S^4. We will revise some recent results regarding some of the basic geometrical features of their moduli spaces, and on its possible degenerations. We will describe the singular loci of instanton sheaves, and how these lead to new irreducible components of the moduli space of stable sheaves on the projective space.*

**Further information:**
On Tuesday, March 7, at 11:30 in BIPAC seminar room, a seminar in
the Cosmology series:

Paolo Creminelli (ICTP)

Relaxing the Cosmological Constant

On Tuesday, March 7, at 12:00 in L4, a seminar in
the Quantum Field Theory series:

Graeme Segal

to be announced

On Tuesday, March 7, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Vidit Nanda (Oxford)

Local cohomology and canonical stratification

On Thursday, March 9, at 12:45 in L6, a seminar in
the Strings Junior series:

Andrea Ferrari

Vertex operator algebras

On Thursday, March 9, at 16:00 in L6, a seminar in
the Number Theory series:

Jean-Benoît Bost (Paris-Sud, Orsay)

Euclidean lattices of infinite rank and Diophantine applications

*I will discuss the definitions and the basic properties of some infinite dimensional generalizations of Euclidean lattices and of their invariants defined in terms of theta series. Then I will present some of their applications to transcendence theory and Diophantine geometry.*

**Further information:**
On Thursday, March 9, at 16:15 in Sciama Lecture Theatre, a seminar in
the Theoretical Particle Physics series:

Gennaro Corcella (INFN Frascati)

Interpretation of top-quark mass measurements

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**Further information:**
On Friday, March 10, at 15:30 in Martin Wood Lecture Theatre, Clarendon Laboratory, Parks Road, Oxford, a seminar in
the Colloquia Series Seminars series:

Prof Howard Milchberg (University of Maryland)

Astor Visiting Lecturer: Spatio-temporal Optical Vortices

On Tuesday, March 14, at 12:00 in L5, a seminar in
the Quantum Field Theory series:

Guo Chuan Thiang (Adelaide)

Differential topology of exotic fermions in semimetals

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

Erwin Frey (LMU)

Protein Pattern Formation: Rethinking Nonlinear Dynamics

On Friday, April 28, at 16:00 in L1, a seminar in
the Math Colloquium series:

Catharina Stroppel (University of Bonn)

tba

On Friday, May 12, at 16:00 in L1, a seminar in
the Math Colloquium series:

Hinke M Osinga (University of Auckland, NZ)

tba

*tba*

**Further information:**
On Tuesday, May 23, at 12:00 in L4, a seminar in
the Quantum Field Theory series:

Arthur Lipstein (Durham University)

to be announced

On Friday, May 26, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Herbert Spohn (MA@TUM)

tba

On Friday, June 9, at 16:00 in L1, a seminar in
the Math Colloquium series:

Caroline Series (University of Warwick)

tba