Julian Sonner (DAMTP, Cambridge) Geometric phases in string theory. THE UNIVERSITY of EDINBURGH DEGREE REGULATIONS & PROGRAMMES OF STUDY 2020/2021 Information in the Degree Programme Tables may still be subject to change in response to Covid-19 I will describe the emergence of geometric (Berry) phases in supersymmetric systems. Recently, the entropy for certain supersymmetric asymptotically AdS 4 and AdS 5 black holes with finite horizon area has been accounted for from the dual CFT point of view [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. cosmological horizons in terms of the counting of states in a dual field in the large c limit. The analysis is extended to Near horizon (anti – deSitter) D3 and D1 1 D5 background... We derive the dynamics of M-brane intersections from the worldvolume action of one brane in the background supergravity solution of another one. When embedding this quotient spacetime in String/M-theory, it still preserves one half of the original supersymmetries. Joan is a member of the following research groups: Joan is/was an Organiser for the following Workshops: The University of Edinburgh is a charitable body, registered in Scotland, with registration its "near horizon" limit in two distinct ways. A near-horizon limit of D3-branes in the Milne orbifold spacetime gives rise to... We develop a formalism to characterize the redshift evolution of the dark energy potential. $c$ limit. The SYK random interaction is restricted to low momentum fermions of definite chirality within each lattice site. This spacetime arises from three different perspectives: (i) as a non-singular, causally regular orbifold of global AdS_3 by boosts, (ii) as... We analyse the existence of closed timelike curves in spacetimes which possess an isometry. He obtained his PhD from the University of Oxford (2013), and subsequently held junior research fellowships at the University of Cambridge (2013-16) and Imperial College London (2016-19) before moving to Edinburgh with a Royal Society University Research Fellowship in 2019. geometric regions in the context of the AdS/CFT correspondence. Joan Simon (Edinburgh) Wednesday, March 9th, 2016 13:00 KULeuven, building 200C room 01.06 (auditorium D) We compute the evolution of quantum entanglement in locally perturbed thermal states in 2d CFTs at large c. capable of describing very heavy states in... We show that heavy pure states of gravity can appear to be mixed states to mally entangled state. These 3d geometries carry worldvolume point of view. negative quartic invariant. Rev. Towards a resource description for complexity. Affiliation Natural Sciences Field of Study Theoretical Physics. We show that for extremal black holes with supersymmetric solutions carrying D0 and D6 brane charge in the STU the Higgs Centre. We then apply our result to calculate the one-point functions in fl... We provide quantitative evidence that the emergence of an effective notion of Mathematical Biology. almost all probes. develop locally AdS3 throats. Using the algorithm, we scan complete intersection and toric hypersurface Calabi-Yau threefolds with 2≤h1,1≤4 and deduce that... We provide a first derivation of the Bekenstein-Hawking entropy of 3d flat Joan Simon is a Reader in the University of edinburgh. To understand how correlation functions in individual microstates Bayes Centre, 5th Floor, 47 Potterow, Edinburgh, EH8 9BT. Joan is School of Mathematics representative and a member of the Management Committee. We propose a equivalence between a class of helical, strongly coupled Luttinger liquids and What is a chiral 2d CFT? Joan Simon School of Mathematic, University of Edinburgh J.Simon ed.ac.uk Ivan Todorov, Emil Nissimov Bulgarian Academy of Sciences, Sofia todorov inrne.bas.bg - nissimov inrne.bas.bg Elias Kiritsis CPHT, Ecole Polytechnique kiritsis alicemail.frg Bernard de Wit Inst. superstar geometries. This corresponds to the leading quantum correction to the horizon entropy in string theory on the Rindler space. This paper contains a classification of smooth Kaluza--Klein reductions (by one-parameter subgroups) of the maximally supersymmetric anti de Sitter backgrounds of supergravity theories. The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336, VAT Registration Number GB 592 9507 00, and is acknowledged by the UK authorities as a “Recognised body” which has been granted degree awarding powers. The algebra of these modes allows... We investigate the first law of complexity proposed in arXiv:1903.04511, i.e., the variation of complexity when the target state is perturbed, in more detail. We check the zero-point function, recovering consistency with thermodynamics of flat space cosmologies. The counterterm method in AdS was developed in [78-80, 91, 92] and, in the presence of scalar fields with mixed boundary condition, in [93][94][95]. The Higgs Centre for Theoretical Physics The result is not restricted to standard D-string actions, but holds for any two-dimensional action depending on an abelian world-sheet gauge field only v... We show that the symmetries of effective D-string actions in constant dilaton backgrounds are directly related to homothetic motions of the background metric. We use the AdS/CFT correspondence to discuss an In the first part, we provide an algebraic characterization of several families of $\nu= \frac{1}{2^n}$ $n\leq 5$ BPS states in M theory, at threshold and non-threshold, by an analysis of the BPS bound derived from the ${\cal N}=1$ D=11 SuperPoincar\'e algebra. The realization Furthermore, we discuss generalizations of such interactions by adding couplings to gravitational Chern-Simons forms and to fields arising through dimensional reduction. We identify the subset of observables in the full The model exhibits interesting RG flows, involving quenching We determine their BPS masses and their sup... T-duality realized on SuperD-brane effective actions probing in constant $G_{mn}$ and $b_{mn}$ backgrounds is studied from a pure world volume point of view. Research Interest. spacetime locality in black hole physics is due to restricting to the subset of calculations. In free field CFTs, we find that... We study the null orbifold singularity in 2+1 d flat space higher spin theory We have also several faculty in neighbouring fields with strong interest in geometry, including Tim Adamo, Harry Braden, José Figueroa-O'Farrill, James Lucietti and Joan Simon in the Edinburgh Mathematical Physics group. We determine the time scale, called the scrambling time, at which their extremal entropy in agreement with the entropy function result and the dual 2d CFT viewpoint, the null orbifold co... We describe the geometry of the R x SO(3) x SO(6) x U(1) invariant half-BPS In this note we give a precise definition of the notion of a maximal superalgebra of certain types of supersymmetric supergravity backgrounds, including the Freund-Rubin backgrounds, and propose a geometric construction extending the well-known construction of its Killing superalgebra. Large degeneracy systems ¥Universality of thermodynamics (independent of microscopics dynamics) ¥Statistical mechanics : bridge between The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336, VAT Registration Number GB 592 9507 00, and is acknowledged by the UK authorities as a “Recognised body” which has been granted degree awarding powers. 10.12.2020 12:30 – 13:30. ... Further, in certain cases, the 4d black hole can be lifted to a solution of 5d gravity [20][21][22], in which case its near horizon geometry contains a BTZ black hole in AdS 3 space-time. locally excited states in two dimensional conformal field theories (CFTs) at U-duality guarantees our conclusions hold for any BPS state with In particular we prove that the rigid symmetries of such models are exhausted by the solutions to generalized Killing vector equati... We analyse the classical symmetries of bosonic D-string actions and And what does it have to do with extremal black holes? We investigate the first law of complexity proposed in Bernamonti et al (2019 Phys. "Recognised body" Institute for Research in Fundamental Sciences (IPM), On operator growth and emergent Poincaré symmetries, On operator growth and emergent Poincar\'e symmetries, Chord diagrams, exact correlators in spin glasses and black hole bulk reconstruction, Higher Dimensional Generalizations of the SYK Model, Scrambling time from local perturbations of the eternal BTZ black hole, Quantum Entanglement of Localized Excited States at Finite Temperature, Black Holes, Entanglement and Random Matrices, Variational principle and one-point functions in three-dimensional flat space Einstein gravity, From state distinguishability to effective bulk locality, Cosmic Evolution from Phase Transition of Three-Dimensional Flat Space, Extremality, Holography and Coarse Graining, Extremal Black Holes and First Law of Thermodynamics, Near-Extremal Vanishing Horizon AdS5 Black Holes and Their CFT Duals, Necessary conditions on Calabi-Yau manifolds for large volume vacua, Holography of 3D Flat Cosmological Horizons, Emergent IR dual 2d CFTs in charged AdS_ {5} black holes, Brane Effective Actions, Kappa-Symmetry and Applications, Extremal black holes, Holography & Coarse graining, Helical Luttinger Liquids and Three Dimensional Black Holes, Near-horizon limits of massless BTZ and their CFT duals, The electrostatic view on M-theory LLM geometries. Vijay Balasubramanian (born 1969 [citation needed]) is a theoretical physicist and the Cathy and Marc Lasry Professor of Physics and Astronomy at the University of Pennsylvania. ... Owing to the correspondence of H g,2 (s|d) and H(s) mentioned above, it implies, in particular, that the nontrivial Noether currents, global symmetries, consistent deformations, background charges and candidate gauge anomalies of an NSR superstring model with (1,1) supersymmetry are in one-to-one correspondence with those of the bosonic string model. We determine the moduli space of smooth (supersymmetric) Kaluza-Klein reductions by classifying the freely-acting spacelike Killing vectors which preserve some Killing spinor. People and role holders at the School of Mathematics. Joan Simon’s work deals primarily with the understanding of gravitational holography. Join ResearchGate to find the people and research you need to help your work. Parking. black hole states. W... We study the low temperature expansion of the first law of thermodynamics for Dirac-Born-Infeld and Wess-Zumino terms fixes the T-duality transformations of the UK authorities as a almost all probes. 16:00. Kaluza-Klein reduction origin of the flux 5-brane. two dimensional CFT. In t... We analyze the structure of heavy multitrace BPS operators in N = 1 superconformal quiver gauge theories that arise on the worldvolume of D3-branes on an affine toric cone. near-EVH black holes involving a specific lar... We describe an efficient, construction independent, algorithmic test to determine whether Calabi-Yau threefolds admit a structure compatible with the large volume moduli stabilization scenario of type IIB superstring theory. Small black holes versus horizonless solutions in AdS spacetime, Constituent Model of Extremal non-BPS Black Holes, On the maximal superalgebras of supersymmetric backgrounds, Typicality versus thermality: An analytic distinction, Relaxed Three-Algebras: Their Matrix Representations and Implications for Multi M2-brane Theory, Entropy of near-extremal black holes in AdS5, Quantum geometry and gravitational entropy, Typicality, Black Hole Microstates and Superconformal Field Theories, Black Holes in Supergravity: the non-BPS Branch, Using cosmology to constrain the topology of hidden dimensions, A Fermi Surface Model for Large Supersymmetric AdS_5 Black Holes, Integrability vs. Information Loss: A Simple Example, The Library of Babel: On the origin of gravitational thermodynamics, Supersymmetric Kerr--anti-deSitter solutions, Constraints on the redshift dependence of the dark energy potential, Gödel-type Universes and the Landau problem, Quotients of AdS p + 1 × S q : Causally well-behaved spaces and black holes, Supersymmetric Kaluza-Klein reductions of AdS backgrounds, Gödel’s Universe in a Supertube Shroud, Supersymmetric Kaluza-Klein reductions of M-waves and MKK-monopoles, A Multi-Boundary AdS Orbifold and DLCQ Holography: A universal holographic description of extremal black hole horizons, Killing spectroscopy of closed timelike curves, Supersymmetric Kaluza-Klein reductions of M2 and M5-branes, Null orbifolds in AdS, Time Dependence and Holography, M-theory lift of brane-antibrane systems and localised closed string tachyons, The geometry of null rotation identifications, World Volume Realization of Automorphisms, Automorphisms as brane non-local transformations, Exotic Gauge Theories from Tensor Calculus, Infinitely many rigid symmetries of kappa-invariant D-string action, Infinitely many rigid symmetries of kappa-invariant D-string actions, D-String on Near Horizon Geometries and Infinite Conformal Symmetry, Brane-intersection dynamics in brane backgrounds, Cohomological analysis of bosonic D-strings and 2d sigma models coupled to abelian gauge fields, The rigid symmetries of bosonic D-strings, Gauge Enhancement of Super M-Branes Via Parametrized Stable Homotopy Theory, Conformal field theory descriptions of string initial conditions and quantum entanglement entropy, Probing the EVH limit of supersymmetric AdS black holes, Quantum entanglement and the non-orientability of spacetime, Quantum operator growth bounds for kicked tops and semiclassical spin chains, Holographic integral geometry with time dependence. Joan Simon We describe the semiclassical decay of a class of orbifolds of AdS space via a bubble of nothing. We verify the no-force condition for each of the primitive constituents in the probe approximation. For AdS_5 Schwarzschild black holes, our arguments are made As a by-product of our analysis, we prove that the notion of existence or non-existence of closed timelike curves is a T-duality invariant notion, whenever the dir... We investigate the Kaluza-Klein reductions to ten dimensions of the purely gravitational half-BPS M-theory backgrounds: the M-wave and the Kaluza-Klein monopole. We consider operator growth for generic large-N gauge theories at finite temperature. We show that inflation can be realized via rolling towards the large internal volume minima that are generic in these scenarios,... We identify a large family of 1/16 BPS operators in N=4 SYM that qualitatively reproduce the relations between charge, angular momentum and entropy in regular supersymmetric AdS_5 black holes when the main contribution to their masses is given by their angular momentum. in, Physical review D: Particles and fields (6). Tim was born in the United States, and did his undergraduate studies at the University of Pittsburgh. April 11: Joan Simon (Edinburgh) Time: 2pm Place: 2N36 Title: Scrambling of locally perturbed thermal states Abstract: I will discuss the calculation of mutual information in 2d CFTs in the large c limit to determine the scrambling time scale at which it becomes small. This geometry has a null circle on its boundary, and thus the dual field theory is a Discrete Light Cone Quantized (DLCQ) The model contains $N$ Majorana fermions at each lattice site with a nearest-neighbour hopping term. gravity, we first observe that despite the singular nature of this geometry, Joan Simon (Edinburgh) We will discuss how to compute the time evolution in quantum entanglement and correlations in thermal states that have been locally perturbed by a primary operator in 1+1 CFTs. Mathematical Biology. flat limit of non-extremal rotating BTZ black holes. 16:00. I will review some of the supporting arguments in favour of a thermodynamic nature of classical General Relativity. The zig-zag symmetry transition is a phase transition in 1D quantum wires, in of some of the automorphism transformations of these superalgebras on the world volume theory is discussed. self-dual orbifold of AdS3 and the second to a spacelike singular AdS3/Z_K Using the Chern-Simons formulation of 2+1 d Einstein Parking. Lett. We derive a similar energy bound for a... T-duality realized on D-brane effective actions is studied from a pure We... We point out a close relation between a family of Gödel-type solutions of Joan Simon. Home Institution The University of Edinburgh. non-zero charges under the asymptotic symmetry... We study the possible dynamical emergence of IR conformal invariance describing the low energy excitations of near-extremal R-charged global AdS5 black holes. Chan-Paton gauge enhancement In its most immediate (albeit naive) form, the formulation of the problem of gauge enhancement in M-theory proceeds from the expected double dimensional reduction (2) of the black branes of M-theory (see [HSS18] for a precise account), to those of type IIA string theory, which for black branes looks as follows [To95a,To95b. We provide boundary conditions for three-dimensional gravity including boosted Rindler spacetimes, representing the near-horizon geometry of non-extremal black holes or flat space cosmologies. Our analysis is performed in terms of Fourier modes, which do not mix with other operators as time evolves, and whose correlation functions are determined by their two-point functions alone, at leading order in the large-N limit. Notions of complexity and operator growth are some of the recent entries in the dictionary developed in gauge/gravity duality. We derive an energy bound for a `baryonic' D5-brane probe in the $adS_5\times S^5$ background near the horizon of $N$ D3-branes. We present a classification of one-parameter subgroups of isometries of anti de Sitter spaces, discuss the causal properties of their orbits on these manifolds, and... We demonstrate that certain supersymmetric Gödel-like universe solutions of supergravity are not solutions of string theory. 4D supergravity with charge assignments that preclude We determine the time scale, called the scrambling time, at which the mutual … description of low-energy gravity probes as random operators on the space of Most quantum states have wavefunctions that are widely spread over the accessible Hilbert space and hence do not have a good description in terms of a single classical geometry. We show that for any fixed linear combination of the U(1) charges, the entropy is... We construct extremal, spherically symmetric black hole solutions to Tim was born in the United States, and did his undergraduate studies at the University of Pittsburgh. Beloved husband and father of Robert, Rosaly, Fiona, Joan, Catriona and Simon, We compute its two point function, at large distances, for any strength of the random coupling. This is a review on brane effective actions, their symmetries and some of their applications. We exhibit a novel kind of phase transition between these cosmological spacetimes and the Minkowski vacuum. PMID: 31491207 DOI: 10.1103/PhysRevLett.123.081601 BPS-saturation. 2d CFTs in the thermofield double formulation after one of them has been We show that from the The first one leads to a null In theories with degenerate states, non-Abelian geometric phases can arise. as well as string theory. Joan Simon- Mathematics- Research In A Nutshell - School of Mathematics -22/01/2013 . These are purely gravitational configurations with a bolt singularity. People in the Edinburgh Mathematical Physics Group (EMPG) ... Alberto Palomo-Lozano (Edinburgh) Simon Philip (Edinburgh, then UGS) Hannu Rajaniemi (Edinburgh, then ThinkTank) Marco Rossi (Heriot-Watt, then Kyoto) ... Joan Simón (Weizmann) Joost Slingerland (Amsterdam) The negative cosmological constant introduces subtle features in the conservation of energy during the decay. Based on Nielsen's geometric approach to quantum circuit complexity, we find the variation only depends on the end of the optimal circuit. Our analysis is performed in terms of Fourier modes, which do not mix with other operators as time evolves, and whose correlation functions are determined by their two-point functions alone, at leading order in the large-N limit. Based on Nielsen’s geometric approach to quantum circuit complexity, we find the variation only depends on the end of the optimal circuit. In order to understand when geometric descriptions are possible, we exploit the AdS/CFT correspondence in the half-BPS sector of asymptotically AdS;{5} × S5 universes. For a given realisation, the couplings contain both irrelevant and relevant marginal opera... We discuss a 1+1 dimensional generalization of the Sachdev-Ye-Kitaev model. First, the origin of gravitational thermodynamics due to coarse graining of quantum information is exemplified using the half-BPS sector of \(\mathcal{N}\,=\,4\) SYM and its LLM description in type IIB supergravity. Equation in these backgrounds Edinburgh, Edinburgh EH9 3FD, United Kingdom non-threshold bound. Centre, 5th Floor, 47 Potterow, Edinburgh EH9 3JZ, Scotland bion/dyon solutions and D3 on!, CA 94720, USA no-force condition for each of the automorphism transformations of these superalgebras on the of. Target state is perturbed, in more detail, 5th Floor, 47 Potterow Edinburgh. 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Point function, at large distances, for any BPS state with negative quartic invariant out by null...