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Login
Higher Structures, Gravity and Fields
from
Monday, 9 January 2023 (09:00)
to
Friday, 27 January 2023 (17:00)
Monday, 9 January 2023
09:00
registration
registration
09:00 - 10:00
Room: 02.430
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
Geometric actions in gravity
-
Glenn Barnich
Geometric actions in gravity
Glenn Barnich
10:30 - 11:30
Room: 02.430
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
Asymptotic structure of gravity with Ehlers symmetry
-
Sucheta Majumdar
Asymptotic structure of gravity with Ehlers symmetry
Sucheta Majumdar
15:30 - 16:30
Room: 02.430
18:00
Reception: drinks and snacks at the institute
Reception: drinks and snacks at the institute
18:00 - 19:00
Room: 02.430
Tuesday, 10 January 2023
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
Higher-spins from higher dualisations
-
Nicolas Boulanger
Higher-spins from higher dualisations
Nicolas Boulanger
10:30 - 11:30
Room: 02.430
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
Brane wrapping in AKSZ topological field theories
-
David Tennyson
Brane wrapping in AKSZ topological field theories
David Tennyson
15:30 - 16:30
Room: 02.430
Wednesday, 11 January 2023
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
Quest for Background Independence
-
Ivo Sachs
Quest for Background Independence
Ivo Sachs
10:30 - 11:30
Room: 02.430
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
Higher-derivative corrections and duality invariance
-
Camille Eloy
Higher-derivative corrections and duality invariance
Camille Eloy
15:30 - 16:30
Room: 02.430
19:00
workshop dinner
workshop dinner
19:00 - 21:00
Room: 02.430
Thursday, 12 January 2023
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
Double Field Theory as the Double Copy of Yang-Mills Theory
-
Olaf Hohm
Double Field Theory as the Double Copy of Yang-Mills Theory
Olaf Hohm
10:30 - 11:30
Room: 02.430
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
Supergravity and Supergeometry
-
Pietro Grassi
Supergravity and Supergeometry
Pietro Grassi
15:30 - 16:30
Room: 02.430
Friday, 13 January 2023
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
Presymplectic gauge PDEs and Lagrangian BV formalism beyond jet-bundles
-
Maxim Grigoriev
Presymplectic gauge PDEs and Lagrangian BV formalism beyond jet-bundles
Maxim Grigoriev
10:30 - 11:30
Room: 02.430
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
Consistent Truncations and Dualities
-
Falk Hassler
Consistent Truncations and Dualities
Falk Hassler
15:30 - 16:30
Room: 02.430
A major application of extended geometries in supergravity is the construction of consistent truncations. Remarkably, all this construction's ingredients also appear in the context of generalised T- and U-dualities. After a quick review of both concepts, I will discuss a conjectured correspondence between consistent truncations and generalised dualities in string and M-theory. We will prove that all known generalised dualities give rise to consistent truncations. Moreover, we will see evidence that after incorporating higher derivative correction, all consistent truncations might be based on generalised dualities.
Saturday, 14 January 2023
Sunday, 15 January 2023
Monday, 16 January 2023
09:00
registration
registration
09:00 - 10:00
Room: 02.430
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
Spinors and geometric structures
-
Kirill Krasnov
Spinors and geometric structures
Kirill Krasnov
10:30 - 11:30
Room: 02.430
My aim will be to explain some relatively well-known (and then less-known) geometric constructions linking structures of the type appearing in double field theory to spinors. The well-known example is that of a split signature metric on a vector space together with a choice of a maximal totally null subspace as encoded by a real pure spinor. But I will also describe less-known examples when the metric together with (a unit) spinor is encoded by a collection of certain differential forms. I will describe how going up in dimension necessitates considering impure spinors, and how these bring with themselves even more interesting geometry. My plan is to end with an example in 14 dimensions, with a split signature metric, where a generic real spinor can be shown to encode the second (dynamical) metric of double field theory. I hope to be able to make this talk interesting to anyone familiar with generalised geometry and/or double field theory.
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
On the backgrounds of spinning particles
-
Eugenia Boffo
On the backgrounds of spinning particles
Eugenia Boffo
15:30 - 16:30
Room: 02.430
Spinning particles are models for point particles with spin degrees of freedom. They automatically feature N-supersymmetry on the worldline, with fixed albeit arbitrary N. After first quantization one obtains spin-N/2 states in the Hilbert space. Consistency conditions for second quantization, realized in the form of BRST quantization, can severely restrict the background fields in target space, putting them on-shell. In the N=2 case the target space can host a Yang-Mills gauge theory, while in N=4 it is possible to have Einstein's gravity and the NS-NS sector of Supergravity. After explaining these passages, I will present new results involving the Ramond-Ramond fluxes (based on arXiv:2206.03243 with I. Sachs). I wish to conclude this analysis with some brief comments on almost complex structures (on-going work with O. Hulik and I. Sachs).
18:00
Reception: drinks and snacks at the institute
Reception: drinks and snacks at the institute
18:00 - 19:00
Room: 02.430
Tuesday, 17 January 2023
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
Conformal (higher spin) gravity and Deformation quantization
-
Evgeny Skvortsov
Conformal (higher spin) gravity and Deformation quantization
Evgeny Skvortsov
10:30 - 11:30
Room: 02.430
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
Post-Newtonian Test of Double Field Theory
-
Jeong-Hyuck Park
Post-Newtonian Test of Double Field Theory
Jeong-Hyuck Park
15:30 - 16:30
Room: 02.430
Wednesday, 18 January 2023
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
From Lie algebra crossed modules to tensor hierarchies, and beyond
-
Sylvain Lavau
From Lie algebra crossed modules to tensor hierarchies, and beyond
Sylvain Lavau
10:30 - 11:30
Room: 02.430
Gauging procedures in supergravity theories depart from classical gauge theories as in the former, the gauge fields take values in the fundamental representation V of the Lie algebra g of global symmetries of the system. The consistency of the theory relies on a pairing V-->g called the embedding tensor, turning V into a Leibniz algebra. As is usually met in higher gauge theories, if the gauge algebra is not Lie, it is replaced by some higher form of Lie algebras. Here, such a higher structure is materialized by a differential graded Lie algebra on a chain complex of g-modules, called the tensor hierarchy. In the present talk we explain how tensor hierarchies are genetically related to Lie algebra crossed modules. Indeed, two such algebras V and g, together with their embedding tensor, form a triple called a Lie-Leibniz triple, of which Lie algebra crossed modules are particular cases. The canonical assignment (functor) associating to any Lie algebra crossed module its corresponding unique 2-term differential graded Lie algebra can be extended to the category of Lie-Leibniz triples, giving their associated tensor hierarchies. This shows that Lie-Leibniz triples form natural generalizations of Lie algebra crossed modules and that their associated tensor hierarchies can be considered as some kind of 'lie-ization' of the former. The "oidization" of such Lie-Leibniz triples then conjecturally opens the possibility to define the tensor hierarchies associated to Courant algebroids and G-algebroids.
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
Carrollian and Galilean conformal spin-3 theories in 3d
-
Iva Lovrekovic
Carrollian and Galilean conformal spin-3 theories in 3d
Iva Lovrekovic
15:30 - 16:30
Room: 02.430
Thursday, 19 January 2023
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
D=2 supergravity and affine exceptional field theory
-
Franz Ciceri
D=2 supergravity and affine exceptional field theory
Franz Ciceri
10:30 - 11:30
Room: 02.430
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
2d gauged supergravity and consistent truncations
-
Gianluca Inverso
2d gauged supergravity and consistent truncations
Gianluca Inverso
15:30 - 16:30
Room: 02.430
19:00
workshop dinner
workshop dinner
19:00 - 22:00
Room: 02.430
Friday, 20 January 2023
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
The most complicated way of writing D=11 supergravity
-
Axel Kleinschmidt
The most complicated way of writing D=11 supergravity
Axel Kleinschmidt
10:30 - 11:30
Room: 02.430
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
Arborescent Koszul-Tate resolutions and BFV for singular coisotropic reductions
-
Thomas Strobl
Arborescent Koszul-Tate resolutions and BFV for singular coisotropic reductions
Thomas Strobl
15:30 - 16:30
Room: 02.430
Let $I$ be an ideal in some commutative (associative) algebra $O$. Starting from resolution of $O/I$ as an $O$-module, we construct a Koszul-Tate resolution for this quotient, i.e.\ a graded symmetric algebra over $O$ with a differential which provides simultaneously a resolution as an $O$-module. This algebra resolution has a beautiful structure of a forest of decorated trees and is related to an $A_\infty$ algebra on the original module resolution. Considering $O$ to be a Poisson algebra and $I$ a finitely generated Poisson subalgebra, we use the above construction to obtain the corresponding BFV formulation. Its cohomology at degree zero is proven to coincide with the reduced Poisson algebra $N(I)/I$, where $N(I)$ is the normaliser of $I$ inside $O$, thus generalising ordinary coisotropic reduction to the singular setting. As an illustration we use the example where $O$ consists of functions on $T^*(\R^3)$ and $I$ is the ideal generated by angular momenta. This is joint work with Aliaksandr Hancharuk and, in part, with Camille Laurent-Gengoux.
Saturday, 21 January 2023
Sunday, 22 January 2023
Monday, 23 January 2023
09:00
registration
registration
09:00 - 10:00
Room: 02.430
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
Extended geometry and restricted associativity
-
Jakob Palmqvist
Extended geometry and restricted associativity
Jakob Palmqvist
10:30 - 11:30
Room: 02.430
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
Algebraic structures in the pure spinor superfield formalism
-
Ingmar Saberi
Algebraic structures in the pure spinor superfield formalism
Ingmar Saberi
15:30 - 16:30
Room: 02.430
18:00
Reception: drinks and snacks at the institute
Reception: drinks and snacks at the institute
18:00 - 19:00
Room: 02.430
Tuesday, 24 January 2023
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
A new consistent limit of 11D supergravity
-
Eric Bergshoeff
A new consistent limit of 11D supergravity
Eric Bergshoeff
10:30 - 11:30
Room: 02.430
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
Systematics of consistent truncations
-
Michela Petrini
Systematics of consistent truncations
Michela Petrini
15:30 - 16:30
Room: 02.430
18:00
Branes and kappa symmetry: a supergeometric insight
-
Carlo Alberto Cremonini
Branes and kappa symmetry: a supergeometric insight
Carlo Alberto Cremonini
18:00 - 18:30
Room: 02.430
Wednesday, 25 January 2023
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
Counting moduli of flux backgrounds
-
Daniel Waldram
Counting moduli of flux backgrounds
Daniel Waldram
10:30 - 11:30
Room: 02.430
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
Quantum space-time, torsion and gravity from quantum effects in the IIB matrix model
-
Harold Steinacker
Quantum space-time, torsion and gravity from quantum effects in the IIB matrix model
Harold Steinacker
15:30 - 16:30
Room: 02.430
20:30
workshop dinner
workshop dinner
20:30 - 23:30
Room: 02.430
Thursday, 26 January 2023
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
Gauge theory, higher structures and compatibility conditions
-
Athanasios Chatzistavrakidis
Gauge theory, higher structures and compatibility conditions
Athanasios Chatzistavrakidis
10:30 - 11:30
Room: 02.430
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
G-algebroids, embedding tensors, and Poisson–Lie duality
-
Fridrich Valach
G-algebroids, embedding tensors, and Poisson–Lie duality
Fridrich Valach
15:30 - 16:30
Room: 02.430
I will describe a class of structures, known as G-algebroids, which arises as a natural generalisation of the ordinary, generalised, and exceptional tangent bundles from ordinary, generalised, and exceptional geometry, respectively. I will discuss a classification result in the exceptional case and show how to obtain the possible fluxes/twists of the bracket. In the M-theory and IIB setups, the twists organise themselves naturally into connections and covariantly constant differential forms, while in the IIA case one in particular recovers both the Romans mass and the deformation of Howe–Lambert–West. Finally, I will show how to use these algebroids to answer a question about the realisability of embedding tensors (providing a new perspective on the result of Inverso '17) and to give a joint description of the Poisson–Lie T- and U-duality. This is a joint work with M. Bugden, O. Hulik, and D. Waldram.
18:00
Palatini variation in generalized geometry and effective actions
-
Branislav Jurco
Palatini variation in generalized geometry and effective actions
Branislav Jurco
18:00 - 18:30
Room: 02.430
Friday, 27 January 2023
10:00
Coffee break
Coffee break
10:00 - 10:30
Room: 02.430
10:30
Quantization of braided noncommutative field theories
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Marija Dimitrijević Ćirić
Quantization of braided noncommutative field theories
Marija Dimitrijević Ćirić
10:30 - 11:30
Room: 02.430
In this talk we will shortly review the construction of noncommutative field theories via the (braided) L-infinity algebra. Then we will discuss quantization of these theories on two examples: braided scalar field theory and braided U(1) gauge theory coupled with fermions, braided electrodynamics. In the case of scalar field theory we show the absence of UV/IR mixing at one loop order, while in the braided electrodynamics the UV/IR mixing remains present at one loop order.
15:00
Coffee break
Coffee break
15:00 - 15:30
Room: 02.430
15:30
D-branes and doubled geometry
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Richard Szabo
D-branes and doubled geometry
Richard Szabo
15:30 - 16:30
Room: 02.430