# All Upcoming Events

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

No Seminar

On Tuesday at 11:30 in Simpkins Lee Room, Beecroft Building, a seminar in
the Cosmology series:

Boris Bolliet (University of Manchester)

Cosmological constraints from the thermal Sunyaev Zeldovich power spectrum and cluster counts

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

Joseph Conlon (Oxford)

The Swampland, Holography and the Large Volume Scenario

*String compactifications are essential for connecting string theory to low energy particle physics and cosmology. Moduli stabilisation gives rise to effective Lagrangians that capture the low-energy degrees of freedom. Much recent interest has been on swampland consistency conditions on such effective field theories - which low energy Lagrangians can arise from quantum gravity? Furthermore, given that moduli stabilisation scenarios often exist in AdS space, we can also ask: what do swampland conditions mean in the context of AdS/CFT? I describe work on developing a holographic understanding of moduli stabilisation and swampland consistency conditions. I focus in particular on the Large Volume Scenario, which is especially appealing from a holographic perspective as in the large volume limit all its interactions can be expressed solely in terms of the AdS radius, with no free dimensionless parameters.*

**Further information:**
On Tuesday at 15:30 in L4, a seminar in
the Algebraic Geometry series:

Dominic Bunnett (FU Berlin)

Moduli of hypersurfaces in weighted projective space

*The moduli space of smooth hypersurfaces in projective space was constructed by Mumford in the 60’s using his newly developed classical (a.k.a. reductive) Geometric Invariant Theory. I wish to generalise this construction to hypersurfaces in weighted projective space (or more generally orbifold toric varieties). The automorphism group of a toric variety is in general non-reductive and I will use new results in non-reductive GIT, developed by F. Kirwan et al., to construct a moduli space of quasismooth hypersurfaces in certain weighted projective spaces. I will give geometric characterisations of notions of stability arising from non-reductive GIT.*

**Further information:**
On Tuesday at 16:00 in C5, a seminar in
the Twistor Workshop series:

Dhritiman Nandan (Southampton)

Celestial Amplitudes: conformal partial waves and soft theorems

*Massless scattering amplitudes in four-dimensional Minkowski spacetime can be Mellin transformed to correlation functions on the celestial sphere at null infinity called celestial amplitudes. We study various properties of massless four-point scalar and gluon celestial amplitudes such as conformal partial wave decomposition, crossing relations and optical theorem. As a byproduct, we derive the analog of the single and double soft limits for all gluon celestial amplitudes.*

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

Diego Berdeja Suarez

Seiberg-Witten theory

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

Markus Ebert (MIT)

Power corrections for fixed-order subtractions

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

Michalis Neururer (TU Darmstadt)

Fourier expansions at cusps and the Manin constant of elliptic curves

*I will discuss the arithmetic significance of Fourier expansions of modular forms at cusps. I will talk about joint work with F. Brunault, where we determine the number field generated by Fourier coefficients of newforms at a cusp. Then I will discuss joint work with A. Saha and K. Česnavičius where we find denominator bounds for Fourier expansions at cusps and apply these bounds to a conjecture on the Manin constants of elliptic curves.*

**Further information:**
On Thursday at 16:15 in Simpkins Lee Room, Beecroft Building, a seminar in
the Theoretical Particle Physics series:

Maria Ubiali (DAMTP Cambridge)

Can New Physics hide in the proton PDFs?

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**Further information:**
On Friday at 15:30 in Martin Wood Lecture Theatre, a seminar in
the Colloquia Series Seminars series:

Professor Thirumalai Venkatesan (National University of Singapore)

Bridging the divide - academic entrepreneurship

On Monday, June 3, at 12:45 in L3, a seminar in
the String Theory series:

Anthony Ashmore (Oxford)

TBA

On Monday, June 3, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Astrophysics Colloquia series:

Dr Phil Uttley (University of Amsterdam)

TBA

On Monday, June 3, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Lukas Brantner (Oxford University)

Lie algebras in finite and mixed characteristic.

*Partition Lie algebras are generalisations of rational differential graded Lie algebras which, by a recent result of Mathew and myself, govern the formal deformation theory of algebro-geometric objects in finite and mixed characteristic. In this talk, we will take a closer look at these new gadgets and discuss some of their applications in algebra and topology*

**Further information:**
On Tuesday, June 4, at 11:30 in Conference Room, DWB, a seminar in
the Cosmology series:

Felipe Oliveira Franco (University of Geneva)

A null test to probe the scale-invariance of the growth of structure

On Tuesday, June 4, at 12:00 in L4, a seminar in
the Relativity series:

Aron Wall (Cambridge DAMTP)

TBA

On Tuesday, June 4, at 15:30 in L4, a seminar in
the Algebraic Geometry series:

Thomas Kahle (OvGU Madgeburg)

Linear syzygies, hyperbolic Coxeter groups and regularity

On Thursday, June 6, at 12:45 in L6, a seminar in
the Strings Junior series:

Max Hubner

6d (2,0) SCFT

On Thursday, June 6, at 13:00 in Simpkins Lee Seminar Room, a seminar in
the Dalitz Seminar in Fundamental Physics series:

Sebastian Trojanowski (Sheffield)

TBC

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**Further information:**
On Thursday, June 6, at 16:00 in L6, a seminar in
the Number Theory series:

Valentina DiProietto (University of Exeter)

A non-abelian algebraic criterion for good reduction of curves

*For a family of proper hyperbolic complex curves $f: X \longrightarrow \Delta^*$ over a puntured disc $\Delta^*$ with semistable reduction at the center, Oda proved, with transcendental methods, that the outer monodromy action of $\pi_1(\Delta^*) \cong \mathbb{Z}$ on the classical unipotent fundamental group of the generic fiber of $f$ is trivial if and only if $f$ has good reduction at the center. In this talk I explain a joint work with B. Chiarellotto and A. Shiho in which we give a purely algebraic proof of Oda's result.*

**Further information:**
On Thursday, June 6, at 16:15 in Simpkins Lee Room, Beecroft Building, a seminar in
the Theoretical Particle Physics series:

Simon Badger (IPPP Durham)

Analytic methods for two-loop amplitudes in QCD

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**Further information:**
On Friday, June 7, at 16:00 in L1, a seminar in
the Math Colloquium series:

Michael Hintermueller (Humboldt)

Title tbc

On Monday, June 10, at 12:45 in L3, a seminar in
the String Theory series:

Masazumi Honda (Cambridge University)

Quantum Black Hole Entropy from 4d Supersymmetric Cardy formula

*I will talk about supersymmetric index of 4d N=1 supersymmetric theories on S^1xM_3 which counts supersymmetric states. In the first part, I will discuss a general formula to describe an asymptotic behaviour of the index in the limit of shrinking S^1 which we refer to as 4d (refined) supersymmetric Cardy formula. This part is based on arXiv:1611.00380 with Lorenzo Di Pietro. In the second part, I will apply this formula to black hole physics. I will mainly focus on superconformal index of SU(N) N=4 super Yang-Mills theory which is expected to be dual to type IIB superstring theory on AdS_5 x S^5. We will see that the index in the large-N limit reproduces the Bekenstein-Hawking entropy of rotating charged BPS black hole on the gravity side. Our result for finite N makes a prediction to the black hole entropy with full quantum corrections. The second part is based on arXiv:1901.08091.*

**Further information:**
On Monday, June 10, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Astrophysics Colloquia series:

Dr Tomer Shenar (KU Leuven)

TBA

On Monday, June 10, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Ruadhai Dervan (Cambridge)

Moduli of polarised varieties via canonical Kähler metrics

*Moduli spaces of polarised varieties (varieties together with an ample line bundle) are not Hausdorff in general. A basic goal of algebraic geometry is to construct a Hausdorff moduli space of some nice class of polarised varieties. I will discuss how one can achieve this goal using the theory of canonical Kähler metrics. In addition I will discuss some fundamental properties of this moduli space, for example the existence of a Weil-Petersson type Kähler metric. This is joint work with Philipp Naumann.*

**Further information:**
On Tuesday, June 11, at 11:30 in Conference Room, DWB, a seminar in
the Cosmology series:

Marco Crisostomi (Universit� Paris-Saclay)

TBC

On Tuesday, June 11, at 12:00 in L4, a seminar in
the Quantum Field Theory series:

Elizabeth Winstanley (Sheffield)

Vacuum polarization on topological black holes

*The renormalized expectation value of the stress energy tensor (RSET) is an object of central importance in quantum field theory in curved space-time, but calculating this on black hole space-times is far from trivial. The vacuum polarization (VP) of a quantum scalar field is computationally simpler and shares some features with the RSET. In this talk we consider the properties of the VP for a massless, conformally coupled scalar field on asymptotically anti-de Sitter black holes with spherical, flat and hyperbolic horizons. We focus on the effect of the different horizon curvature on the VP, and the role played by the boundary conditions far from the black hole.*

**Further information:**
On Tuesday, June 11, at 15:30 in L4, a seminar in
the Algebraic Geometry series:

Alastair Craw (University of Bath)

TBA

On Thursday, June 13, at 12:45 in L5, a seminar in
the Strings Junior series:

Marc-Antoine Fiset

Class S Gaiotto construction

On Thursday, June 13, at 13:00 in Simpkins Lee Seminar Room, a seminar in
the Dalitz Seminar in Fundamental Physics series:

Rudin Petrossian-Byrne (Oxford)

TBC

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**Further information:**
On Thursday, June 13, at 16:00 in L6, a seminar in
the Number Theory series:

Gerd Faltings (University of Bonn and MPIM)

Arakelov geometry

On Thursday, June 13, at 16:15 in Simpkins Lee Room, Beecroft Building, a seminar in
the Theoretical Particle Physics series:

Jin U Kang (ICTP Trieste)

String-loop corrected effective action of type IIB orientifolds

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

Fernando Quevedo (Cambridge)

Phenomenological and cosmological challenges for string theory

On Friday, June 14, at 16:00 in L1, a seminar in
the Math Colloquium series:

Luc Illusie (Université de Paris-Sud, Orsay)

Old and new on crystalline cohomology and the de Rham-Witt complex

*The subject of $p$-adic cohomologies is over fifty years old. Many new developments have recently occurred. I will mostly limit myself to discussing some pertaining to the de Rham-Witt complex. After recalling the historical background and the basic results, I will give an overview of the new approach of Bhatt, Lurie and Mathew.*

**Further information:**
On Monday, June 17, at 14:00 in Denis Sciama Lecture Theatre, a seminar in
the Astrophysics Colloquia series:

Dr Norbert Wex (Max Planck)

TBA

On Monday, June 17, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Jason Lotay (Oxford)

TBA

On Monday, June 17, at 16:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Kirill Melnikov (KIT)

TBA

On Tuesday, June 18, at 11:30 in Conference Room, DWB, a seminar in
the Cosmology series:

Juliana Kwan (Liverpool John Moores University)

Preparing for Precision Cosmology with Cosmic Emulation

On Tuesday, June 18, at 15:30 in L4, a seminar in
the Algebraic Geometry series:

Marco Gualtieri (University of Toronto)

TBA

On Thursday, June 20, at 12:45 in L6, a seminar in
the Strings Junior series:

Matteo Parisi

N=4 Super Yang-Mills

On Thursday, June 20, at 16:00 in L6, a seminar in
the Number Theory series:

David Corwin (UC Berkeley)

TBA

On Friday, June 21, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Erwin Frey (Munich)

Emergence and Self-Organisation in Biological Systems

On Monday, June 24, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Elena Gal (Oxford)

TBA

On Tuesday, June 25, at 15:30 in L4, a seminar in
the Algebraic Geometry series:

Kobi Kremnizer (Oxford)

Global analytic geometry and Hodge theory

*In this talk I will describe how to make sense of the function $(1+t)^x$ over the integers. I will explain how different rings of analytic functions can be defined over the integers, and how this leads to global analytic geometry and global Hodge theory. If time permits I will also describe an analytic version of lambda-rings and how this can be used to define a cohomology theory for schemes over Z. This is joint work with Federico Bambozzi and Adam Topaz.*

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

Nigel Cooper (Cambridge)

Topology and Dynamics in Engineered Quantum Many-Body Systems

On Friday, October 18, at 16:00 in L1, a seminar in
the Math Colloquium series:

Reidun Twarock (University of York)

Title tbc

On Friday, October 25, at 16:00 in L1, a seminar in
the Math Colloquium series:

David Gabai (Princeton)

Title tbc

On Friday, November 15, at 16:00 in L1, a seminar in
the Math Colloquium series:

Doug Arnold (University of Minnesota)

Title tbc

On Tuesday, November 19, at 15:30 in L4, a seminar in
the Algebraic Geometry series:

Bernd Sturmfels (Berkeley and MPI Leipzig)

TBA