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.
Found at least 20 result(s)
Exceptional Seminar Evgeny Buchbinder (University of Western Australia)
at: 14:00 room H503  abstract:

Regular Seminar Paul Richmond (Oxford)
at: 14:00 room B1004  abstract: I will discuss how to construct rigid supersymmetric gauge theories on Riemannian fivemanifolds following a holographic approach. This approach realises the fivemanifold as the conformal boundary of a sixdimensional bulk supergravity solution and leads to a systematic classification of fivedimensional supersymmetric backgrounds with gravity duals. The background metric is furnished with a conformal Killing vector, which generates a transversely holomorphic foliation with a transverse Hermitian structure. Finally, I’ll also construct supersymmetric Lagrangians for gauge theories coupled to arbitrary matter on such backgrounds. 
Regular Seminar Benjamin Assel (Kings College)
at: 14:00 room H503  abstract: I will discuss the partition function of 4d N=1 theories on Hopf surfaces. These are diffeomorphic to S^1 x S^3 and the partition function provides a path integral realization of the supersymmetric index. Its large S^1 limit exhibits a universal behaviour associated to the existence of a Casimir energy. I will argue that, contrarily to the nonsupersymmetric case, this Casimir energy is a physical (nonambiguous) quantity in supersymmetric theories. 
Regular Seminar Tomasz Lukowski (Oxford)
at: 14:00 room H503  abstract: 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 fourpoint 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. 
Regular Seminar Tristan Dennen (NBI)
at: 14:00 room H503  abstract: Supergravity theories were once hoped to provide ultraviolet finite theories of quantum gravity without requiring profoundly new physical frameworks. These hopes faded in the 1980s, but renewed efforts in recent years have uncovered some surprising ultraviolet behaviour. In this talk, I will give an overview of the explicit scattering amplitude calculations in perturbative supergravity over the last few years. In particular cases, there are indications of ultraviolet cancellations not accounted for by known symmetry arguments. I will highlight these cases and give some reasons to be optimistic and some reasons to be pessimistic about supergravity as a contender for a quantum theory of gravity. 
Regular Seminar Kostas Sfetsos (University of Athens)
at: 14:00 room H503  abstract: We review the construction of the socalled λdeformations of WZW and gauged WZW models. We discuss their integrability and algebraic properties, their behavior under RG flows as well as their embeddings to typeII supergravity. 
Exceptional Seminar Alfio Bonanno (INAF/INFN)
at: 12:00 room H503  abstract:

Regular Seminar Yolanda Lozano (Oviedo)
at: 14:00 room H503  abstract: We will present new AdS_6 and AdS_4 backgrounds constructed using nonAbelian Tduality on known solutions and discuss some properties of the dual CFTs associated to these backgrounds. 
Regular Seminar David Tong (Cambridge)
at: 14:00 room H503  abstract: I'll revisit some old of ideas of Euclidean quantum gravity, in which manifolds of different topology are summed in the path integral. I'll show that, in certain circumstances, gravitational instantons can destabilise supersymmetric KaluzaKlein compactifications. We'll also see how oneloop divergences in quantum gravity can be subsumed into a new RGinvariant topological scale. 
Regular Seminar Luis Miramontes (Santiago)
at: 14:00 room H503  abstract: The Smatrix of the worldsheet theory of the string in AdS(5)xS(5) is known to admit a deformation where the original symmetry algebra is replaced by the associated quantum group. The case where q, the deformation parameter, is real has been identified as a particular deformation of the GreenSchwarz sigma model known as the "etadeformation". The case with q a root of unity interpolates between the AdS(5)xS(5) worldsheet theory and its Pohlmeyer reduction. However, an interpretation of this case is still lacking. We will summarize recent work aimed to show that sigma models on (semi)symmetric spaces F/G admit discrete integrable deformations that can be viewed as deformations of the F/F gauged WZW model. For the AdS(5)xS(5) worldsheet theory, F=PSU(2,24) and the resulting theory has just the right amount of kappasymmetries, which points to the existence of a new fully consistent deformed string background. 
Regular Seminar Ezra Getzler (Northwestern)
at: 14:00 room H503  abstract:

Regular Seminar Ricardo Monteiro (Oxford U., Inst. Math.)
at: 13:30 room Huxley 503  abstract: We will discuss the relation between perturbative gauge theory and perturbative gravity, and look at how this relation extends to some exact classical solutions. First, we will review the double copy prescription that takes gauge theory amplitudes into gravity amplitudes, which has been crucial to progress in perturbative studies of supergravity. Then, we will see that the selfdual sectors provide an important insight into the relation between the theories. A key role is played by a kinematic algebraic structure mirroring the colour structure. Finally, we will see how these ideas extend to some exact classical solutions, namely black holes and plane waves. This leads to a relation of the type Schwarzschild as Coulomb charge squared. 
Regular Seminar Nadav Drukker (King's College)
at: 14:00 room H139  abstract: I will review the calculation of the partition function of 3d supersymmetric field theories on S^3 using the fermigas approach to solve the matrix integral. The resulting expression is an Airy function and is valid perturbatively to all orders in 1/N for a wide class of theories (including ABJM). This suggests that a similar formula can be derived by studying quantum gravity on AdS_4. I will explain several of the steps needed to implement this idea and some intriguing results. 
Regular Seminar Solodukhin Sergey (Tours)
at: 14:00 room H503  abstract: In my talk I will give a brief review on entanglement entropy and discuss some recent developments which include relations to the geometric Willmore conjecture and the role of total derivatives in the trace anomaly. 
Regular Seminar Thomas Elze (Pisa University)
at: 13:30 room H503  abstract: It will be shown that the dynamics of discrete (integervalued) Hamiltonian cellular automata can only be consistently defined, if it is linear in the same sense that unitary evolution in quantum mechanics is linear. This suggests us to look for an invertible map between such automata and continuous quantum mechanical models. Based on sampling theory, such a map can indeed be constructed and leads to quantum mechanical models which incorporate a fundamental scale. The admissible observables, the onetoone correspondence of the respective conservation laws, and the existence of solutions of the modified dispersion relation for stationary states are discussed. References: H.T. Elze, Action principle for cellular automata and the linearity of quantum mechanics, Phys. Rev. A 89, 012111 (2014) [arXiv:1312.1615]; do., Journal of Physics: Conference Series 504 (2014) 012004 [arXiv:1403.2646]; 
Regular Seminar Natalia Pinzani Fokeeva (Amsterdam)
at: 14:00 room H503  abstract: It is widely believed that hydrodynamics is the low energy effective theory of any quantum field theory. In this talk I will derive the local low energy effective action for uncharged dissipationless conformal fluids through holography. This can be achieved by solving a doubleDirichlet problem for linearised gravitational perturbations between the conformal boundary of a (4+1)dimensional AdSblack brane background and a stretched horizon. Interestingly dissipationless fluid dynamics is captured by Goldstone bosons of the broken symmetries by the classical solution ending on the second boundary. I will discuss how the effective action approach might be inconsistent unless there is a coupling to a dissipative dynamical IR sector which for simplicity can be replaced by a membrane paradigmlike boundary condition on a stretched horizon and I will also comment on the limits of validity of this simplification. 
Regular Seminar Carmen Li (Edinburgh)
at: 14:30 room H503  abstract: We determine the most general threedimensional vacuum spacetime with a negative cosmological constant containing a nonsingular Killing horizon. We show that the general solution with a spatially compact horizon possesses a second commuting Killing field and deduce that it must be related to the BTZ black hole (or its nearhorizon geometry) by a diffeomorphism. We show there is a general class of asymptotically AdS_3 extreme black holes with arbitrary charges with respect to one of the asymptoticsymmetry Virasoro algebras and vanishing charges with respect to the other. We interpret these as descendants of the extreme BTZ black hole. 
Regular Seminar Nicholas Warner (IPhT, Saclay and Southern California U.)
at: 13:30 room H503  abstract:

Regular Seminar Alexander Krikun (Nordita)
at: 14:00 room H503  abstract: In its most general formulation the gauge/string duality may be used to build models of various strongly coupled systems in condensed matter. One of these is hightemperature dwave superconductor. The holographic model of dwave superconductor includes the dynamics of spin2 charged field on top of the curved AdS geometry. In the probe approximation the model may be formulated consistently and exhibits a number of interesting physical phenomena. The important task is to classify all possible ground states of the model, which will correspond to the various phases of the dual system, and study the resulting phase diagram. In this talk I will discuss the recently found ground state which exhibits the stripes of charge density, violates the translation symmetry spontaneously and may be associated with the pseudogap state in highTc superconductors. 