## Directions

Imperial College has its own detailed information on general directions and on getting to the theoretical physics group. The College is located on Prince Consort Road, south of Hyde Park (map). The most convenient access is via tube (South Kensington, Gloucester Road) or buses. The Theoretical Physics group resides on the 5th floor of the Huxley Building. The group also possesses its own description.

## Seminars at Imperial College

Found at least 20 result(s)

### 27.10.2021 (Wednesday)

#### Supersymmetric Yang--Mills theories on the lattice

Regular Seminar David Schaich (Liverpool)

 at: 14:00 ICroom H503 abstract: Lattice field theory provides a non-perturbative regularization suitable for strongly interacting systems, which has proven crucial to the study of quantum chromodynamics among many other theories. Lattice investigations of supersymmetric field theories have a long history but often struggle due to the interplay of supersymmetry with the lattice discretization of space-time. I will discuss a way around these difficulties for d-dimensional supersymmetric Yang--Mills theories with at least 2^d supercharges. After informally reviewing some highlights of the lattice formulation, I will survey a selection of results from recent and ongoing numerical studies, including tests of holographic dualities.

### 26.10.2021 (Tuesday)

#### Black hole microstates from the worldsheet

Regular Seminar David Turton (Southampton)

 at: 14:00 ICroom Huxley 342 abstract: I will describe recent studies of bound states of NS5 branes carrying momentum and/or fundamental string charge, in the decoupling limits leading to little string theory and to AdS3/CFT2 duality. This work involves a class of exactly solvable worldsheet models that describe families of BPS and non-BPS black hole microstates. These models have enabled studies of string and D-brane probes of these microstates, yielding insight into their stringy structure in the gravitational bulk description.

### 19.10.2021 (Tuesday)

#### New postdoc introduction

Regular Seminar David Tennyson and Morteza Hosseini (Imperial)

 at: 1:30 ICroom B630 abstract: Morteza Hosseini: "Microstates of AdS black holes in string theory." Iâ€™ll review recent advances of counting black holes microstates in AdS spacetimes. David Tennyson: "Supersymmetric flux backgrounds of string theory." I will review my work on the geometry of supersymmetric flux backgrounds of string theory through generalised geometry. In particular, I will introduce the exceptional complex structure and discuss some applications.

### 12.10.2021 (Tuesday)

#### Quantum algebras in supersymmetric gauge theories: interfaces and stable envelopes

Regular Seminar Nikita Nekrasov (SCGP, Stony Brook and Center for Advanced Studies, Skoltech, Moscow)

 at: 13:20 ICroom B630 abstract: I will give an overview of a three decade long project of novel symmetries in quantum field theory, with the emphasis on the most recent development concerning the realisation of stable envelopes (proposed by A. Okounkov and collaborators) and R-matrices via supersymmetric interfaces in 1-2-3 dimensional supersymmetric gauge theories. Based on the recent paper arXiv:2109.10941 with Mykola Dedushenko.

### 05.10.2021 (Tuesday)

#### Aspects of the black hole/string transition

Regular Seminar Yiming Chen (Princeton University)

 at: 13:30 ICroom NA abstract: Abstract: It has long been speculated that a black hole in string theory turns into highly excited strings close to the Hagedorn temperature. Gravitational attraction pulls different parts of the string together, forming a star-like configuration. In this talk, I will review the properties of a concrete solution of this kind, first discovered by Horowitz and Polchinski. I will discuss whether the Horowitz-Polchinski solution can be smoothly connected with the black hole as worldsheet CFTs. I will also discuss how the story can be generalized to charged cases, as well as its implication on the near extremal limit.

### 29.06.2021 (Tuesday)

#### The classical interior of black holes in holography

Regular Seminar Sean Hartnoll (ITP Stanford University)

 at: 13:30 ICroom zoom 871 9223 5980 abstract: The exterior dynamics of black holes has played a major role in holographic duality, describing the approach to thermal equilibrium of strongly coupled media. The interior dynamics of black holes in a holographic setting has, in contrast, been largely unexplored. I will describe recent work investigating the classical interior dynamics of various holographic black holes. I will discuss the nature of the singularity, the absence of Cauchy horizons and a new kind of chaotic behavior that emerges in the presence of charged scalar fields. [please email a.held@imperial.ac.uk for zoom link or password]

### 22.06.2021 (Tuesday)

#### On Vacuum Transitions and the String Lanscape

Regular Seminar Senarath de Alwis (University of Colorado)

 at: 15:30 ICroom zoom 871 9223 5980 abstract: I discuss from a Hamiltonian (Lorentzian) perspective the calculations of vacuum transitions in flat space field theory and in gravitational backgrounds without the use of problematic Euclidean arguments. Some implications for the string theory landscape are highlighted. [please note the unusual time] [please email a.held@imperial.ac.uk for zoom link or password]

### 15.06.2021 (Tuesday)

#### Discovering Lepton Flavour Universality Violating New Physics

Regular Seminar Andreas Crivellin (CERN, Zurich University, PSI Villigen)

 at: 13:30 ICroom zoom 871 9223 5980 abstract: While the LHC has not discovered any new particles directly yet, hints for the violation of lepton flavour universality (satisfied within the SM) accumulated in recent years. In particular, deviations from the SM predictions were observed in semi-leptonic B decays (b->sll and b->ctau), in the anomalous magnetic moment of the muon (g-2), in leptonic tau decays and di-electron searches. Furthermore, also the deficit in first row CKM unitarity, known as the Cabibbo Angle Anomaly, can be interpreted as a sign of lepton flavour universality violation. In this talk I review the status of these anomalies and give an overview of the possible interpretations in terms of new physics models. [please email a.held@imperial.ac.uk for zoom link or password]

### 08.06.2021 (Tuesday)

#### Towards the path integral for gravity

Regular Seminar Neil Turok (Perimeter Institute and University of Edinburgh)

 at: 13:30 ICroom zoom 871 9223 5980 abstract: We show how Feynman's path integral for quantum mechanics may be defined without a Wick rotation to imaginary time. Instead, we employ analytic continuation (and Cauchy's theorem) in the complexified space of paths being integrated over. We outline an existence proof and describe applications to both nonrelativistic quantum mechanics and to interference patterns due to gravitational microlensing in radio astronomy. [please email a.held@imperial.ac.uk for zoom link or password]

### 01.06.2021 (Tuesday)

#### QFT for Gravity at All Scales

Regular Seminar Michele Levi (NBI Copenhagen)

 at: 13:30 ICroom zoom 871 9223 5980 abstract: We will present the state of the art in PN gravity, and its significant advancement via the EFT of spinning gravitating objects. First, we will introduce the concept of a tower of EFTs for the binary inspiral problem. We will then go over the intricate formulation of the EFT of spinning objects. Finally, we will present some advanced recent results accomplished within this framework. [please email a.held@imperial.ac.uk for zoom link or password]

### 26.05.2021 (Wednesday)

#### Muon g-2: experiment, standard model and lattice QCD

Exceptional Seminar Laurent Lellouch (CNRS and Aix-Marseille U.)

 at: 14:00 ICroom zoom 871 9223 5980 abstract: Twenty years ago in an experiment at Brookhaven National Laboratory, physicists measured the muon's anomalous magnetic moment, $a_\mu=(g_\mu-2)/2$, with a remarkable precision of 0.54 parts per million. Since then, the standard model prediction for $a_\mu$ has exhibited a discrepancy with experiment of over 3 standard deviations, raising the tantalizing possibility of physical particles or forces as yet undiscovered. On April 7 a new experiment at Fermilab presented its first results, brilliantly confirming Brookhaven's measurement and bringing the discrepancy with the standard model to a near discovery level of 4.2 sigma. To fully leverage this and future measurements, and possibly claim the presence of new fundamental physics, it is imperative to check the standard model prediction with independent methods, and to reduce its uncertainties. After an introduction and a discussion of the current experimental and theoretical status of $a_\mu$, I will present a precise lattice QCD calculation, by the BMW collaboration, of the contribution to this quantity that most limits the precision of the standard model prediction. The result of this calculation significantly reduces the gap between the standard model and experiment, and suggests that new physics may not be needed to explain the current, experimental, world-average value of $a_\mu$. [please email a.held@imperial.ac.uk for zoom link or password]

### 18.05.2021 (Tuesday)

#### The hazardous landscape of Affinesia

Regular Seminar Jose Beltran Jimenez (Salamanca University)

 at: 13:30 ICroom zoom 871 9223 5980 abstract: The standard formulation of General Relativity is based on a geometrical framework where the spacetime manifold is endowed with a Lorentzian metric and its associated Levi-Civita connection. Since the affine structure is independent of the metric, it is possible to extend this geometrical set-up to allow for more general connections, thus giving rise to the metric-affine framework where the new actors are the torsion and the non-metricity. After discussing how these two objects can provide equivalent descriptions of GR, I will discuss how pathologies arise in modified theories of gravity along different directions in the metric-affine landscape. [please email a.held@imperial.ac.uk for zoom link or password]

### 11.05.2021 (Tuesday)

#### Gravity: The force from the UV

Regular Seminar Simon Caron-Huot (McGill University)

 at: 13:30 ICroom zoom 871 9223 5980 abstract: Does our world respect causality at all energy scales? We explore constraints on low-energy dynamics which step from this assumption. Obstructions to a causal UV completion can be diagnosed using dispersive sum rules, which connect the infrared and ultraviolet. While dispersion relations originate in optics and quantum field theory, I will argue that their true purpose is gravity, where they become particularly powerful due to the maximal growth rate of this force with energy. This leads to the so-called graviton pole in sum rules. I will briefly review how, for non-gravitational low-energy effective theories, causality turns dimensional analysis estimates into sharp numerical bounds, and I will present initial results on gravitational effective theories. [please email a.held@imperial.ac.uk for zoom link or password]

### 04.05.2021 (Tuesday)

#### Cosmology as a tool to test fundamental physics

Regular Seminar Lavinia Heisenberg (ETH Zurich)

 at: 13:30 ICroom zoom 871 9223 5980 abstract: I will start by introducing the two fundamental pillars of Cosmology: General Relativity and the Cosmological Principle. General Relativity will be constructed both in the geometrical as well as in the particle physics perspective. After introducing some of the prominent effective field theories of gravity I will show how the Cosmological Principle can be realized in the different theories. I will then discuss how different theoretical consistency checks can be applied on them for their scrutiny, like conditions coming from a UV completion and quantum corrections. I will argue that we will need to combine this theoretical scrutiny program with different cosmological observations in order to disentangle between different dark energy models and test fundamental properties of gravity. [please email a.held@imperial.ac.uk for zoom link or password]

### 28.04.2021 (Wednesday)

#### Kaluza-Klein spectrometer from exceptional field theory

Regular Seminar Henning Samtleben (ENS Lyon)

 at: 14:00 ICroom Zoom abstract: I review new tools for the computation of Kaluza-Klein mass spectra associated with compactifications around various background geometries relevant for string theory. This includes geometries with little to no remaining symmetries, hardly accessible to standard methods. The new tools build on exceptional field theory, the duality covariant formulation of supergravity. Among the applications I discuss the stability of several non-supersymmetric AdS4 and AdS3 vacua, as well as Kaluza-Klein spectra around type IIB S-fold backgrounds. Zoom: https://zoom.us/j/98264204601?pwd=Z0xYdG1vVlEwU1M1bDhVcXQvWURPQT09 Meeting ID: 982 6420 4601 Passcode: 196883

### 27.04.2021 (Tuesday)

#### Topics in inflationary cosmology: reheating, gauge fields and gravitational waves

Regular Seminar Kaloian Lozanov (University of Illinois)

 at: 13:30 ICroom zoom 871 9223 5980 abstract: We will review our current understanding of reheating after inflation, including various aspects of the linear and nonlinear dynamics of the inflaton field, such as parametric resonance, the generation of metric perturbations and the effects of the nonlinear evolution on the post-inflationary expansion history. We will also review the recent progress in the understanding of the non-perturbative dynamics of dark vector fields during reheating and whether they can play the role of dark matter in the late universe. Finally, we will discuss phenomenologically interesting models of gauge fields during inflation which can give rise to detectable gravitational wave signatures. [please email a.held@imperial.ac.uk for zoom link or password]

### 20.04.2021 (Tuesday)

#### EFTs, Gravity and Clues from the UV

Regular Seminar Clifford Burgess (Perimeter Institute for Theoretical Physics and McMaster University)

 at: 15:30 ICroom zoom 871 9223 5980 abstract: Everyone seems to have strong opinions these days about what UV completions to gravity can tell us about lower-energy physics. Perceived difficulties finding inflationary solutions to string theory in particular have prompted re-examination of the utility of EFT methods, such as through the swampland trans-Planckian conjectures. This talk provides a curmudgeonly assessment of some of these proposals together with my own opinion about the likely low-energy take-aways of attempts to embed cosmology into string theory. If there is time I will describe some aspects of gravitation EFTs that really do seem to deviate from the standard Wilsonian picture. [please note the unusual time] [please email a.held@imperial.ac.uk for zoom link or password]

### 20.04.2021 (Tuesday)

#### (please note that the time of this semiar has been moved to 15:30)

Regular Seminar Cliff Burgess (McMaster University and Perimeter Institute for Theoretical Physics)

 at: 13:30 ICroom online abstract: (please note that the time of this semiar has been moved to 15:30)

### 14.04.2021 (Wednesday)

#### Holographic Approaches to AdS Black Hole Entropy

Regular Seminar Marina David ( University of Michigan)

 at: 14:00 ICroom Zoom abstract: Significant progress has been made regarding the microstate counting of extremal AdS black holes in the context of AdS/CFT, where the Cardy-like limit on the field side theory has often been used. I will discuss the implications of this limit on the gravity side and how it translates to a parameter space limit on the black hole solution. This limit, referred to as the gravitational Cardy limit, is applied to the Bardeen Horowitz near-horizon geometry to reproduce the Bekenstein-Hawking entropy via the Kerr/CFT correspondence, yielding a third approach to the computation of the entropy. Relaxing the gravitational Cardy limit, the computation can be further extended to near-extremality, where the heat capacity is found. For each case, extremal and near-extremal, the entropy from these different approaches match, providing a unique and universal expression for the entropy. https://zoom.us/j/98264204601?pwd=Z0xYdG1vVlEwU1M1bDhVcXQvWURPQT09

### 13.04.2021 (Tuesday)

#### Bootstrapping surface defects in four-dimensional superconformal theories

Regular Seminar Madalena Lemos (Durham University)

 at: 13:30 ICroom zoom 871 9223 5980 abstract: We will motivate and introduce the study of conformal defects in superconformal field theories (SCFTs). We will show how symmetries constrain the anomaly coefficients of BPS defects. In the case of N=(2,2) surface defects in four-dimensional N=2 SCFTs these anomaly coefficients can be computed by studying a protected sub-sector captured by a two-dimensional chiral algebra. [please email a.held@imperial.ac.uk for zoom link or password]