BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Axel Kleinschmidt (AEI Potsdam) DTSTART:20200501T123000Z DTEND:20200501T133000Z DTSTAMP:20260404T110959Z UID:EGSS/1 DESCRIPTION:Title: EFTs and ExFTs\nby Axel Kleinschmidt (AEI Potsdam) as part of Exce ptional geometry seminar series\n\n\nAbstract\nI will discuss how exceptio nal field theory can be used to compute aspects of the low-energy effectiv e field theory description of type II string theory. Since exceptional fie ld theory also includes the description of (exotic) branes\, one can also determine the exact non-perturbative contributions to certain higher-deriv ative couplings. Emphasis will be put on recent advances for 1/8-BPS coupl ings that are connected to tropical limits of string invariants at genus t wo.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Riccardo Borsato (Santiago de Compostela U.\, IGFAE) DTSTART:20200515T123000Z DTEND:20200515T133000Z DTSTAMP:20260404T110959Z UID:EGSS/2 DESCRIPTION:Title: Local beta-shifts and alpha'-corrections\nby Riccardo Borsato (San tiago de Compostela U.\, IGFAE) as part of Exceptional geometry seminar se ries\n\n\nAbstract\nLocal (i.e. non-constant) beta shifts of O(D\,D) are a solution-generating technique in supergravity\, when additional condition s are imposed on beta. In the literature this construction has been known as "homogeneous Yang-Baxter deformation"\, and it was first introduced to generate integrable deformations of 2d sigma-models. Interest on such defo rmations is also motivated by their relation to non-abelian T-duality. In this talk I will review some aspects of this subject and I will explain ho w to obtain alpha'-corrections for the deformed backgrounds by exploiting the Double Field Theory formulation.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/2/ END:VEVENT BEGIN:VEVENT SUMMARY:David Tennyson (Imperial College London) DTSTART:20200508T123000Z DTEND:20200508T133000Z DTSTAMP:20260404T110959Z UID:EGSS/3 DESCRIPTION:Title: Generalising G2 geometry: involutivity\, moment maps and moduli\nb y David Tennyson (Imperial College London) as part of Exceptional geometry seminar series\n\n\nAbstract\nUnderstanding the geometry of flux backgrou nds of string theory and M-theory is an important problem in phenomenology . Most attempts at this require studying backgrounds according to torsion classes\, or treating the flux perturbatively through moduli stabilisation . However\, in both cases we either lose analytic tractability by losing t he integrable G-structures that characterise the fluxless backgrounds\, or we get only approximate results for small flux. In this talk we will show that generic flux backgrounds can be described by integrable SU(7) struct ures in exceptional generalised geometry. These structures have properties reminiscent of conventional complex structures\, being described by an in volutive subbundle of the generalised tangent bundle\, and a vanishing mom ent map. Using this structure we will be able to find the exact moduli of broad classes of flux backgrounds. This description of flux backgrounds al so provides a new interpretation of G2 manifolds\, which may have interest ing links with geometric invariant theory and new exceptional Hitchin func tionals.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Chris Blair (Vrije U. Brussels) DTSTART:20200522T123000Z DTEND:20200522T133000Z DTSTAMP:20260404T110959Z UID:EGSS/4 DESCRIPTION:Title: Non-relativistic duality and TTbar deformations\nby Chris Blair (V rije U. Brussels) as part of Exceptional geometry seminar series\n\n\nAbst ract\nStarting with some particular physical theory\, we are often interes ted in then exploring the space of all physical theories either by adding deformations or taking limits. I will describe a connection between two se emingly unrelated such explorations. The first is the TTbar deformation of two-dimensional field theories. The second is the non-relativistic limit of string theory. It is well-known that the TTbar deformation of D free bo sons leads to the Nambu-Goto action in D+2 dimensions\; I will explain how the limit where the deformation parameter returns to zero can be viewed a s a non-relativistic limit of the string. In order to describe and general ise this correspondence\, I will use intuition gained from the O(D\,D) cov ariant "doubled" formulation of string theory geometry. This is natural he re as TTbar deformations can be viewed as TsT or bivector transformations\ , while non-relativistic limits which are singular in terms of the standar d spacetime geometry become well-defined in terms of doubled variables. Ti me permitting I will say something about possible generalisations using ex ceptional geometry.\n\nBased on: https://arxiv.org/abs/2002.12413\n LOCATION:https://stable.researchseminars.org/talk/EGSS/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Gregoire Josse (LPTHE Paris) DTSTART:20200529T123000Z DTEND:20200529T133000Z DTSTAMP:20260404T110959Z UID:EGSS/5 DESCRIPTION:Title: Generalised Geometry and consistent truncation\nby Gregoire Josse (LPTHE Paris) as part of Exceptional geometry seminar series\n\n\nAbstract \nConsistent truncations of ten- and eleven- dimensions supergravity are u seful tools in order to derive lower-dimensional effective theory\, but ar e usually difficult to obtain. Generalised geometry provides a well suite d framework to derive consistent truncations in arbitrary dimension and wi th different amount of supersymmetry\, based on the notion of generalised G-structure. In this talk I will present first the general ideas in generi c dimension and amount of supersymmetry. Then I will show how to apply the formalism to truncations to half-maximal supergravity in five dimensions. As concrete examples\, I will present an M-theory truncation that contain s the Maldacena Nunez solutions for M5-branes wrapped on a Riemann surface .\n LOCATION:https://stable.researchseminars.org/talk/EGSS/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Camille Eloy (ENS Lyon) DTSTART:20200605T123000Z DTEND:20200605T133000Z DTSTAMP:20260404T110959Z UID:EGSS/6 DESCRIPTION:Title: Duality invariance and higher derivatives\nby Camille Eloy (ENS Ly on) as part of Exceptional geometry seminar series\n\n\nAbstract\nT-dualit y implies that string theories\, once compactified on a d-dimensional toru s\, must have a global O(d\,d)symmetry. The exact interplay between this d uality and α'-corrections is however not known. In this talk\, I will exp ose new tools to tackle this problem and show\, considering the bosonic st ring theory to first order in α'\, that this symmetry requires a Gre en-Schwarz type mechanism for α'-deformed O(d\,d) transformations.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Olaf Hohm (Humboldt U. Berlin) DTSTART:20200612T133000Z DTEND:20200612T143000Z DTSTAMP:20260404T110959Z UID:EGSS/7 DESCRIPTION:Title: Duality Hierarchies (UNUSUAL TIME)\nby Olaf Hohm (Humboldt U. Berl in) as part of Exceptional geometry seminar series\n\n\nAbstract\nGauged s upergravity as well as double and exceptional field theory can be formulat ed in terms of a hierarchy of duality relations between curvatures origina ting from the tensor hierarchy. The needed higher algebraic structures can be derived from a differential graded Lie algebra.\nI outline how excepti onal field theory fits into this scheme by showing that its generalized ge ometric structures can be naturally interpreted in terms of an embedding t ensor map and an infinite-dimensional Lie algebra.\n\n(Seminar starts one hour later than usual).\n LOCATION:https://stable.researchseminars.org/talk/EGSS/7/ END:VEVENT BEGIN:VEVENT SUMMARY:Aybike Catal-Ozer (Tech. U. Istanbul) DTSTART:20200619T123000Z DTEND:20200619T133000Z DTSTAMP:20260404T110959Z UID:EGSS/8 DESCRIPTION:Title: Non-abelian T-duality as a transformation in double field theory\n by Aybike Catal-Ozer (Tech. U. Istanbul) as part of Exceptional geometry s eminar series\n\n\nAbstract\nWe show that Non-Abelian T-duality (NATD) can be described as a coordinate dependent O(D\,D) transformation for supergr avity fields in the NS-NS sector and as a Pin(D\,D) transformation for the fields in the RR sector. This enables us to show that NATD is a solution generating transformation in Double Field Theory (DFT)\, by regarding the transformed fields as duality twisted fields in the context ofGauged Doubl e Field Theory (GDFT) of Type II strings. When the isometry algebra is non -unimodular\, consistency of GDFT forces the generalized dilaton field to have a linear dependence on the winding type coordinates of DFT\, implying that the transformed fields satisfy the field equations of DFT in the gen eralized supergravity frame. We also discuss briefly the analogous story f or Yang-Baxterdeformations.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/8/ END:VEVENT BEGIN:VEVENT SUMMARY:Gianluca Inverso (Queen Mary U. of London and INFN sez. di Padova) DTSTART:20200626T123000Z DTEND:20200626T133000Z DTSTAMP:20260404T110959Z UID:EGSS/9 DESCRIPTION:Title: On uplift conditions for gauged supergravities\nby Gianluca Invers o (Queen Mary U. of London and INFN sez. di Padova) as part of Exceptional geometry seminar series\n\n\nAbstract\nSupergravity theories can be consi stently truncated to lower dimensional gauged supergravities\, which has m any applications especially for the purpose of solution generation. A much studied class of truncations are generalised Scherk–Schwarz (gSS) reduc tions. While the principle of such truncations is well-understood and many examples are known\, there is no complete classification of gSS reduction s. Conversely\, it can be difficult to know if a specific gauged supergrav ity can arise from a generalised Scherk–Schwarz truncation of some highe r-dimensional model.\nI will review some results on the general recipe for constructing generalised Scherk–Schwarz uplifts of gauged supergravitie s and on the conditions for such uplifts to exist. I will then discuss wor k in progress in rephrasing such uplift conditions as linear constraints a nd comment on the extension to three-dimensional gauged supergravities and lower\, where the associated exceptional geometries become more complicat ed.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Victor Lekeu (Imperial College London) DTSTART:20200710T123000Z DTEND:20200710T133000Z DTSTAMP:20260404T110959Z UID:EGSS/10 DESCRIPTION:Title: Homotopy transfer and L-infinity algebras\nby Victor Lekeu (Imper ial College London) as part of Exceptional geometry seminar series\n\n\nAb stract\nL-infinity algebras are a generalization of Lie algebras involving \,besides a 2-bracket\, a potentially infinite number of higher-order brac kets which satisfy generalized Jacobi identities. In particular\, the usua l Jacobi identity for the 2-bracket is violated by terms involving a 3-bra cket. Originally discovered in physics in the context of closed string fie ld theory\, it has since been understood that an L-infinity algebra can in fact be associated to any classical field theory\; the Jacobi identities then encode gauge-invariance of the equations of motion\, Noether identiti es and all that\, in a way similar to the BRST-BV field-antifield formalis m. \n In this talk\, I will first review the definition of L-infinity a lgebras\, in two complementary ways: 1) the original formulation involving an infinite number of brackets\, which can be neatly packaged in a nilpot ent coderivation\, and 2) the dual picture\, where L-infinity relations ar e encoded in a nilpotent derivation. (For field theories\, this derivation is nothing but the BRST-BV differential.) Then\, I will explain the mathe matical notion of homotopy transfer: how\, under certain conditions\, the L-infinity structure can descend to a subspace of the original vector spac e. In the field theory context\, this corresponds to the notion of (tree-l evel) integrating out of degrees of freedom\, with the smaller L-infinity algebra encoding the algebraic structure of the effective theory. \n Th is is based on work in progress with Alex S. Arvanitakis\, Chris Hull and Olaf Hohm.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/10/ END:VEVENT BEGIN:VEVENT SUMMARY:Saskia Demulder (MPI Munich) DTSTART:20200717T123000Z DTEND:20200717T133000Z DTSTAMP:20260404T110959Z UID:EGSS/11 DESCRIPTION:Title: Integrable deformation of CPn and generalised Kähler geometry\nb y Saskia Demulder (MPI Munich) as part of Exceptional geometry seminar ser ies\n\n\nAbstract\nGeneralised geometry has proven to be a central framewo rk to understand T- and U-duality. In particular it provides a critical la nguage to understand two-dimensional deformations of non-linear sigma-mode ls on group manifolds and coset spaces which admit Poisson-Lie symmetry. T his latter can be seen as a relaxation of the notion of isometry allowing one to perform a generalised notion of T-duality. In this talk I will dis cuss joint work with F. Hassler\, G. Piccinini\, D. Thompson\, where we st udied integrable deformations of CPn background. Notwithstanding the à pr iori complexity of these deformations\, we show how the deformed CPn backg round is an example of a bi-Hermitian or generalised Kähler geometry. In addition we explain how the generalised Kähler potential can be construct ed for the deformed CPn geometry and provide explicit forms for n=1\,2.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/11/ END:VEVENT BEGIN:VEVENT SUMMARY:Dan Butter (Texas A M) DTSTART:20200724T133000Z DTEND:20200724T143000Z DTSTAMP:20260404T110959Z UID:EGSS/12 DESCRIPTION:Title: E_7 ExFT in superspace [UNUSUAL TIME!]\nby Dan Butter (Texas A M) as part of Exceptional geometry seminar series\n\n\nAbstract\nExceptional field theory (ExFT) provides a framework where T and U-duality can be mad e manifest. In this talk\, I will discuss how supersymmetry can also be ma de manifest in a superspace ExFT. In this approach\, the fermionic coordin ates are unified with the external spacetime coordinates\, which together are acted on by external superdiffeomorphisms. The internal space and its section condition remain purely bosonic. This corresponds to the simplest way one might construct an exceptional superspace\, but even this proves s urprising: it cannot be done directly with the original supersymmetric for mulations of ExFT\, and one must instead relax or reformulate certain feat ures (such as the vielbein postulates). I will sketch how this works for t he case of E_7. The superspace Bianchi identities then lead to the explici t form of the on-shell p-form curvatures as well as their duality relation s. Various applications will also be discussed.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/12/ END:VEVENT BEGIN:VEVENT SUMMARY:Niall Macpherson (IIP\, Brazil) DTSTART:20200731T123000Z DTEND:20200731T133000Z DTSTAMP:20260404T110959Z UID:EGSS/13 DESCRIPTION:Title: AdS$_3$ string vacua and duals to small N=(4\,0) CFTs\nby Niall M acpherson (IIP\, Brazil) as part of Exceptional geometry seminar series\n\ n\nAbstract\nThe AdS$_3$/CFT$_2$ correspondence provides the best arena to test the holographic paradigm. This is simultaneously due to the relative tractability of 2d CFTs and the world sheet theory on AdS$_3$ backgrounds . Despite this\, when compared to their higher dimensional counterparts\, little effort has been made to construct AdS$_3$ string vacua. I will disc uss an ongoing program to fill this gap.\n\nThere exists a rich variety of superconformal algebras in 2d\, with distinct options even for a fixed n umber of supercharges. This makes the problem of classifying holographic d uals to CFTs realising these both interesting and broad. I will discuss ho w one may systematically realise the various algebras in supergravity\, an d make use of G-structure techniques to find new classes of solutions in 1 0 and 11 dimensions. Particular emphasis will be given to a class of solut ions in massive IIA preserving small ${\\cal N}=(4\,0)$ supersymmetry\, fo r which there is a concrete proposal for dual CFTs.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/13/ END:VEVENT BEGIN:VEVENT SUMMARY:Tomas Ortin (Madrid IFT) DTSTART:20200807T123000Z DTEND:20200807T133000Z DTSTAMP:20260404T110959Z UID:EGSS/14 DESCRIPTION:Title: Compactification\, duality and black-hole entropy in stringy black h ole\nby Tomas Ortin (Madrid IFT) as part of Exceptional geometry semin ar series\n\n\nAbstract\nIn this talk I will review results obtained by ou r group over the last few years concerning the calculation of alpha' corre ctions of 4- and 5-dimensional stringy black-hole geometries and the compu tation of their Wald entropies\, always in the context of the Heterotic Su perstring effective action.\n\nFirst\, I will describe the corrections to that action in the Bergshoeff-de Roo formalism and how we can compute the corresponding corrections to the simplest 5- and 4-dimensional (3- and 4-c harge) stringy black holes.\n\nThen\, I will comment on the problems surro unding the application of the Iyer-Wald prescription to the calculation of the Wald entropy of those black holes directly in terms of their 10-dimen sional oxidized counterparts and I will argue that the calculation has to be done using the 4- and 5-dimensional actions.\n\nI will then show how to obtain these actions by direct dimensional reduction and how they provide us with alpha'-corrected T-duality rules. I will derive duality invariant Wald entropy formulas using the Iyer-Wald prescription and I will show th at the entropies obtained satisfy the expected properties.\n\nFinally\, I will comment on the many unresolved problems related to all these issues.\ n LOCATION:https://stable.researchseminars.org/talk/EGSS/14/ END:VEVENT BEGIN:VEVENT SUMMARY:Luigi Alfonsi DTSTART:20200828T123000Z DTEND:20200828T133000Z DTSTAMP:20260404T110959Z UID:EGSS/15 DESCRIPTION:Title: Higher geometric aspects of global Double Field Theory\nby Luigi Alfonsi as part of Exceptional geometry seminar series\n\n\nAbstract\nHigh er differential geometry is a generalization of differential geometry\, wh ere ordinary geometric structures are replaced by their L∞-versions (suc h as L∞groups and L∞algebras). This formalism let the concept of princ ipal bundle be generalized to the one of "bundle gerbe". This geometric ob ject can be equipped with a connection\, whose parallel transport is defin ed on surfaces instead of on paths. This will be exactly the global formal ization of the Kalb-Ramond field. We can then say that bundle gerbes are f or strings what principal bundles are for gauge particles.\n\nDouble Field Theory is often referred to as a generalization of Kaluza-Klein Theory t hat unifies a metric and a Kalb-Ramond field\, instead of a gauge field. C an this statement be made geometrically precise? In this talk I will give a simple introduction to higher differential geometry\, then I will explor e the idea that DFT can be naturally globalized in this geometric formalis m. Finally I will apply this construction to obtain some examples of T-dua lity.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/15/ END:VEVENT BEGIN:VEVENT SUMMARY:Henning Samtleben DTSTART:20200904T123000Z DTEND:20200904T133000Z DTSTAMP:20260404T110959Z UID:EGSS/16 DESCRIPTION:Title: Toward exotic 6D supergravities: Beyond exceptional field theory\ nby Henning Samtleben as part of Exceptional geometry seminar series\n\n\n Abstract\nExotic supergravities are six-dimensional theories with chiral m aximal (4\,0) and (3\,1) supersymmetry\, which instead of a graviton featu re exotic gauge fields with non-standard Young tableaux representations\, subject to selfduality constraints. After reduction to 5D they all share t he field content of standard maximal supergravity. While so far these theo ries are only known in the free limit\, their interacting versions were co njectured by C. Hull to exist and to describe strong coupling limits of N= 8 theories in 5D. \n\nI present novel actions in a 5+1 split of coordinate s whose field equations reproduce those of the free bosonic (4\,0) and (3\ ,1) theory\, respectively\, including the selfduality relations. I discuss evidence for a master exceptional field theory formulation with an extend ed section constraint that\, depending on the solution\, produces the (4\, 0)\, (3\,1) or the conventional (2\,2) theory.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/16/ END:VEVENT BEGIN:VEVENT SUMMARY:Gabriel Larios DTSTART:20200911T123000Z DTEND:20200911T133000Z DTSTAMP:20260404T110959Z UID:EGSS/17 DESCRIPTION:Title: Kaluza-Klein spectra and consistent truncations\nby Gabriel Lario s as part of Exceptional geometry seminar series\n\n\nAbstract\nKaluza-Kle in spectra on string/M-theory solutions depend significantly on whether th e solution can be obtained from uplift of a maximal gauged supergravity. F or some solutions of M-theory\, mIIA and IIB obtained from uplift\, I will present the spectrum of KK gravitons and discuss a persistent form of uni versality when solutions with same (super)symmetry and supergravity spectr um are present in different theories. The masses thus found can be obtaine d from an SL(8)-covariant mass matrix whose trace provides the universal c oefficients.\n\nIn the second part of the talk\, I will discuss the spectr um of KK gravitons around the N=2 AdS_4 solution that is dual to the IR of a cubic deformation of ABJM. This solution cannot be obtained from uplift of an N=8 D=4theory\, and this seems to be linked to the fact that its me tric cannot be isometrically embedded in R^8. Further\, the allocation of modes with different spins in N=2 supermultiplets cannot be made KK level by KK level\, but needs space invaders.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/17/ END:VEVENT BEGIN:VEVENT SUMMARY:Charles Strickland-Constable DTSTART:20200918T123000Z DTEND:20200918T133000Z DTSTAMP:20260404T110959Z UID:EGSS/18 DESCRIPTION:Title: On symmetries and dynamics of exotic supermultiplets\nby Charles Strickland-Constable as part of Exceptional geometry seminar series\n\n\nA bstract\nI will discuss recent work with Ruben Minasian and Yi Zhang on si x-dimensional exotic supermultiplets. The main focus of the talk will be o n the relationship between these multiplets and exceptional symmetries. In particular I will discuss the non-existence of a standard spacetime "sect ion" for these theories and how the exotic graviton appears in the SL(3\,R ) Ehlers symmetry term in algebraic decompositions to three dimensions. I will also present an overview of arguments suggesting that the dynamics of these theories may not reduce to those of supergravity in five dimensions and sketch a proposed construction which connects them to three-dimension al supergravity.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/18/ END:VEVENT BEGIN:VEVENT SUMMARY:Justin Kaidi DTSTART:20200925T133000Z DTEND:20200925T143000Z DTSTAMP:20260404T110959Z UID:EGSS/19 DESCRIPTION:Title: Exotic Branes from del Pezzo Surfaces [UNUSUAL TIME]\nby Justin K aidi as part of Exceptional geometry seminar series\n\n\nAbstract\nWe revi sit a correspondence between toroidal compactifications of M-theory and de l Pezzo surfaces\, in which rational curves on the del Pezzo are related t o 1/2-BPS branes of the corresponding compactification. We argue that curv es of higher genus correspond to non-geometric backgrounds of the M-theory compactifications\, which are related to exotic branes. In particular\, t he number of “special directions” of the exotic brane is equal to the genus of the corresponding curve. In addition to predicting three new non- geometric backgrounds\, we discuss a relation between addition of curves i n the del Pezzo and the brane polarization effect.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/19/ END:VEVENT BEGIN:VEVENT SUMMARY:Falk Hassler DTSTART:20201002T123000Z DTEND:20201002T133000Z DTSTAMP:20260404T110959Z UID:EGSS/20 DESCRIPTION:Title: Quantum corrections for generalised T-dualities\nby Falk Hassler as part of Exceptional geometry seminar series\n\n\nAbstract\nS- and (abel ian) T-duality play a central role in string theory\, but their scope is l imited to highly constrained spacetimes. Generalised T-dualities\, which i nclude non-abelian and Poisson-Lie T-duality\, apply to a significantly la rger class of target spaces with a wide range of applications. Classically they are on an equal footing with abelian T-duality\, but their quantum c orrections are much more mysterious and mostly unexplored. I will review t he main problems which have to be solved to make progress in this directio n. Afterwards\, I demonstrate how recently explored connections between ge neralised T-dualities\, double field theory\, and consistent truncations a llow to prove that two-loop RG flows are preserved under these dualities. We will discuss the implications of this result and emphasise how the intr iguing mathematical structures that govern all the currentapplications inf luence quantum corrections in a highly non-trivial way.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/20/ END:VEVENT BEGIN:VEVENT SUMMARY:Mariana Graña (IPhT Saclay) DTSTART:20201009T123000Z DTEND:20201009T133000Z DTSTAMP:20260404T110959Z UID:EGSS/21 DESCRIPTION:Title: The generalized geometry of backgrounds with gaugino condensates\ nby Mariana Graña (IPhT Saclay) as part of Exceptional geometry seminar s eries\n\n\nAbstract\nMotivated by their potential to stabilise moduli\, we inspect type II backgrounds with gaugino condensates on D-branes. We use the language of generalized complex geometry which is the most adapted to account for their back-reaction. After reviewing the effective 4d physics revealed by Kachru\, Kallosh\, Linde and Trivedi\, as well as the basic c oncepts of generalized complex geometry\, I will show in this talk how th e gaugino condensates modify the action and the supersymmetry conditions\, concentrating on compactifications to four dimensions\, and discuss some of its salient features. We will show how the equations reproduce the phen omenon of moduli stabilisation\, and comment on a local solution that matc hes the on-shell value obtained from the four-dimensional effective action .\n LOCATION:https://stable.researchseminars.org/talk/EGSS/21/ END:VEVENT BEGIN:VEVENT SUMMARY:Hermann Nicolai (MPI Potsdam) DTSTART:20201016T123000Z DTEND:20201016T133000Z DTSTAMP:20260404T110959Z UID:EGSS/22 DESCRIPTION:Title: Standard Model Fermions and K(E10)\nby Hermann Nicolai (MPI Potsd am) as part of Exceptional geometry seminar series\n\n\nAbstract\nThis tal k describes an attempt to amend a scheme originallyproposed by M. Gell-Man n to identify the spin-1/2 fermions of N=8supergravity with the quarks and leptons of the Standard Model. This proposal relies in an essential way o n embedding the SU(8) R symmetryinto the infinite-dimensional `maximal com pact' subgroup K(E10) of the conjectured duality symmetry E10. I will also mention more recentwork exploring the possible role and significance of t he eight massive gravitinos in astrophysics.\n LOCATION:https://stable.researchseminars.org/talk/EGSS/22/ END:VEVENT BEGIN:VEVENT SUMMARY:Kanghoon Lee DTSTART:20201023T123000Z DTEND:20201023T133000Z DTSTAMP:20260404T110959Z UID:EGSS/23 DESCRIPTION:Title: Duality manifest approach for double copy\nby Kanghoon Lee as par t of Exceptional geometry seminar series\n\n\nAbstract\nI will present a g eneralization of the conventional Kerr-Schild(KS) formalism\, a powerful t ool for constructing exact solutions in general relativity\, to the double field theory(DFT)\, exceptional field theory (ExFT) and supergravities. F irst\, a universal structure of the KS ansatz for the generalized metric f or DFT and ExFT will be introduced. I’ll show that their equations motio n reduce to linear partial differential equations. Based on this formalism \, I’ll discuss the exact double copy map\, which represents solutions o f the supergravity equations in terms of solutions of the Maxwell equation .\n LOCATION:https://stable.researchseminars.org/talk/EGSS/23/ END:VEVENT BEGIN:VEVENT SUMMARY:Roberto Bonezzi DTSTART:20201030T133000Z DTEND:20201030T143000Z DTSTAMP:20260404T110959Z UID:EGSS/24 DESCRIPTION:by Roberto Bonezzi as part of Exceptional geometry seminar ser ies\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/EGSS/24/ END:VEVENT END:VCALENDAR