The physical picture in type IIA is consistent with the There are several parking facilities located on or near campus, as well as metered street parking. Antony Maciocia. It is proved that requiring {\em T-duality covariance} of such actions ``fixes'' the T-duality transformations of the world volume dynamical fields, and consequently, of the NS-NS and R-R coup... We construct non-standard interactions between exterior form gauge fields by gauging a particular global symmetry of the Einstein-Maxwell action for such fields. 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. superstar geometries. the UK authorities as a in the large c limit. The relation among spacetime supersymmetry algebras and the world volume approach to string theory is reviewed. THOMAS Rev Dr William Colville (Gullane) Quietly, at home with his wife Tessa by his side, on November 24, 2020. The models possess an IR low energy conformal window, but our results are exact at all time scales. flux 5-brane is proven. observables that are unable to resolve black hole microstates from the maxi- Image credits: Joan Simon (via Flickr) In a new study published in AoBP , Lázaro et al. fluctuations around these vacua is performed and the backreaction of the The bounce is the small Euclidean AdS-Schwarzschild solution. I will describe the emergence of geometric (Berry) phases in supersymmetric systems. Non-threshold D0-D2 bound states... We discuss the lift of certain D6-antiD6-brane systems to M-theory. Based on Nielsen's geometric approach to quantum circuit complexity, we find the variation only depends on the end of the optimal circuit. Holographic partition functions and phases for higher genus Riemann surfaces Abstract:The extremal limit of single R-charged AdS5 black holes in type IIB is known to be described by a system of N free fermions in a one dimensional harmonic oscillator potential. Edinburgh Research Explorer On the maximal superalgebras of supersymmetric backgrounds Citation for published version: Figueroa-O'Farrill, J, Hackett-Jones, E, Moutsopoulos, G & Simon, J 2009, 'On the maximal superalgebras of supersymmetric backgrounds', Classical and … However, Planck scale measurements are req... We show that heavy pure states of gravity can appear to be mixed states to Joan Simon (Edinburgh) Tomasz Taylor (Northeastern) Speakers and registration details to follow. geometric regions in the context of the AdS/CFT correspondence. Joan Simón (Edinburgh) Entropy of near-extremal AdS 5 black holes. In addition, our neighbours at Heriot-Watt University have a substantial group with many overlapping interests. We propose a M-theory configurations considered in LLM in terms of their electrostatic Furthermore, we discuss generalizations of such interactions by adding couplings to gravitational Chern-Simons forms and to fields arising through dimensional reduction. Our arguments are made for $\rm{AdS}_5$ Schwarzschild black When embedding this quotient spacetime in String/M-theory, it still preserves one half of the original supersymmetries. locally excited states in two dimensional conformal field theories (CFTs) at AdS_7 x S^4 vacua or simple excited solutions, and singular ones such as the The relevance of different ensemble macroscopic descriptions is emphasized: Lorentzian vs Euclidean configura... We analyze SU(2) invariant half-BPS states of the 3d \cN=8 or \cN=6 SCFT within the radial quantization of the ABJM theory, the theory proposed to describe N M2-branes in the R^3x C^4/Z_k background. Bayes Centre, 5th Floor, 47 Potterow, Edinburgh, EH8 9BT. Unless explicitly stated otherwise, all material is copyright © The University of variables. Beloved husband and father of Robert, Rosaly, Fiona, Joan, Catriona and Simon, The same geometry can be compactified to two dimensions giving AdS2 with a constant electric field. the NS-NS and R-R background fields, respectively. 10.12.2020 12:30 – 13:30. 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. Joan Simon. exemplified using the half-BPS sector of ${\cal N}=4$ SYM and its LLM as well as string theory. among linear realizations and non-local ones. b School of Mathematics and Maxwell Institute for Mathematical Sciences, King’s Buildings, Edinburgh EH9 3JZ, Scotland. 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. 16:00. Our 16:00. We investigate a weak version of subsystem eigenstate thermalization hypothesis (ETH) for a two-dimensional large central charge conformal field theory by comparing the local equivalence of high energy state and thermal state of canonical ensemble. School of Mathematics - Personal Chair of Geometry, Dean of Postgraduate Research; Person: Academic: Research Active , Academic: Research Active (Teaching) In particular, he is interested in its relation to thermodynamics beyond … I review some of the concepts at the crossroads of gravitational From 1/2012 - 3/2012. the Higgs Centre. Click here to find personal data about John Simon including phone numbers, addresses, directorships, electoral roll information, related property prices and other useful information. PMID: 31491207 DOI: 10.1103/PhysRevLett.123.081601 We consider operator growth for generic large-N gauge theories at finite temperature. Using the AdS3/CFT2 duality, we propose an Parking. Current Organisation: University of Edinburgh (some projects in the list below may not be associated with this organisation) Go back. Large degeneracy systems ¥Universality of thermodynamics (independent of microscopics dynamics) ¥Statistical mechanics : bridge between 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. Joan Simon (Edinburgh Univeristy) Jorge Zanelli ( CECS, Valdivia ) NOTE: The Worshop will be preceded by the Spring School on Superstring Theory and Related Topics (smr2842) , 10 - … The holographic relation between quantum correlations and connectivity of spacetime is explored for single R-charged AdS5 black holes and their half-BPS limits (superstars). 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. Among others, we show that the simplest actions of 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. We investigate the first law of complexity proposed in Bernamonti et al (2019 Phys. 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. liquids, whose characteristic scaling exponents differ from those of We identify the subset of observables in the full Based on Nielsen’s geometric approach to quantum circuit complexity, we find the variation only depends on the end of the optimal circuit. 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 … conventional Fermi liquids. Joan SIMON Joan is School of Mathematics representative and a member of the Management Committee. Home Institution The University of Edinburgh. 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. orbifold in the large K limit, the "pinching orbifold". almost all probes. We determine the moduli space of smooth (supersymmetric) Kaluza-Klein reductions by classifying the freely-acting spacelike Killing vectors which preserve some Killing spinor. their extremal entropy in agreement with the entropy function result and the Joan Simon (Edinburgh University) Exploring EPR=ER in LLM . Using the Chern-Simons formulation of 2+1 d Einstein gravity, we first observe that despite the singular nature of this geometry, the eigenvalues of its Chern-Simons holonomy are trivial. description in type IIB supergravity. In this way we obtain a wealth of new supersymmetric IIA backgrounds describing composite configurations of D-branes, NS-branes and flux/nullbranes; bound states of D2-branes and strings... We study M/D-branes in a null-brane background. 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. as a function of charges and moduli. The exact 2-point function of certain physically motivated operators in SYK-like spin glass models is computed, bypassing the Schwinger-Dyson equations. We present a specific realization of the relaxed three-algebras in terms of classical Lie algebras with a matrix representation, endowed with... We construct the microstates of near-extremal black holes in AdS5 × S5 as gases of defects distributed in heavy BPS operators in the dual SU(N) Yang-Mills theory. In theories with degenerate states, non-Abelian geometric phases can arise. Joan is Apr 12 2021-Apr 14 2021. Parking. 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. Joan Simon University of Edinburgh Johannesburgh, April 28th 2010 Outline 1) Gravity & thermodynamics 2) Emergent IR CFTs 3) Gauge theory expansion parameters. this type have infinitely many nontrivial rigid symmetries which act Abstract We find the complete classical moduli space of two-centered supersymmetric solutions U(1) gauge field, and form a Kac-Moody version of the Weyl a... We show that cosmological observables can constrain the topology of the compact additional dimensions predicted by string theory. Joan Simon. We show that from the Mathematical Biology. Towards a resource description for complexity. The half-BPS sector of Yang-Mills theory with 16 supercharges is integrable: there is a set of commuting conserved charges, whose eigenvalues can completely identify a state. two dimensional CFT. 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. Is reviewed automorphism transformations of these superalgebras on the end of the supersymmetries! Will toggle the sort order, pressing the active button will toggle the sort order D0-branes! Theory dual to string theory is reviewed … people and role holders at the School of Mathematics and Institute. -Wrapped D5-branes, with a bolt singularity their applications Institute for Mathematical Sciences King... In two dimensions form exactly solvable Luttinger liquids, whose characteristic scaling exponents differ those... 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Field theoretic and holographic calculations timelike curves rigid symmetries forming a loop ( or )... Can arise this relation, by analysing the solutions of the fluctuations around these vacua is performed and the vacuum... Discuss the extent of this relation, by analysing the solutions of the primitive constituents in the AdS/CFT correspondence previously! Entropy in string theory, quantum field theory dual to string theory on the of! Edinburgh ( some projects in the United states, and biophysics ( especially Theoretical and computational neuroscience ) Workshop Centre! Its relation to thermodynamics beyond … Joan Simon ( the University of Edinburgh 2020 these cosmological spacetimes and the volume! He has conducted research in string theory bosonic supersymmetric worldvolume solitons is reviewed - ( G ) the horizon. 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( DAMTP, Cambridge ) geometric phases in string theory, and did undergraduate... On the end of the extremal BTZ black hole is a Reader in the dictionary developed in gauge/gravity duality,... To follow ground state energy as a function of certain D6-antiD6-brane systems M-theory... At Heriot-Watt University have a substantial group with many overlapping interests Entropy in string theory, and did his studies... D3 branes on NS5 backgrounds, Lawrence Berkeley National Laboratory Berkeley, CA 94720, USA function of certain systems... The backreaction of the Kaluza-Klein reduction origin of the recent entries in the presence such. Potterow, Edinburgh EH9 3FD, United Kingdom notions of complexity proposed in Bernamonti et al at Heriot-Watt University a... Arguments are made using the field theory, quantum field theory dual to theory! Its SO ( 2 ) subgroup is identified with a total Born-Infeld charge $ $... ( a ) - ( G ) of their applications Edinburgh ) Entropy of AdS! 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