The upcoming talk
At the next session of the TCS,
organised jointly with and courtesy of
the String Journal Club at WFUW,
on the 14th of January 2026,
at 02:15 – 4:00 p.m. CET / 3:15 – 5:15 p.m. EET
Nikita Nekrasov
(SCGP, Stony Brook, New York)
shall continue his talk about
“Geometry of relativistic hydrodynamics (II)“.
Abstract
We formulate the covariant hydrodynamics equations describing the relativistic fluid dynamics as the problem of intersection theory on some infinite dimensional symplectic manifold associated with spacetime. This point of view separates the structures related to the equation of state, the geometry of spacetime, and the structures related to the (differential) topology of spacetime. We point out a five dimensional origin of the formalism of Lichnerowicz and Carter (and of Euler’s equations for compressible ideal fluid). Our formalism makes it easy to incorporate the chiral anomaly and Onsager quantization. We clarify the relation between the canonical and Landau-Lifschitz flows, the meaning of Kelvin’s theorem. Finally, we discuss some connections to topological strings and to canonical approaches to quasiclassical quantization of gravity.
(Joint work with Paul Wiegmann.)
(All seminar talks are given on the online zoom platform. Unless requested otherwise by the speaker or required by the circumstances, and then specifically indicated in the announcement, the talks consist of two halves, 45 minutes each, separated by a 15-minute break. The web link for every session is circulated via the TCS mailing list. In order to be enlisted, please contact the Organisers.)
Calendar 2025/2026
| Date | Speaker (affiliation) | Title (with a link to the slides, whenever available) |
| October 15th, 2025 | Athanasios Chatzistavrakidis (Ruđer Bošković Institute, Zagreb) | Basic curvature tensors in geometry and physics |
| October 29th, 2025 | Martha Valentina Guarín Escudero (Charles University, Faculty of Mathematics and Physics, Prague) | Fedosov connections and L∞-algebras associated to dg-manifolds |
| November 12th, 2025 | Marcin Piątek (Instytut Fizyki, Uniwersytet Szczeciński) | Geometric Foundations of Celestial Amplitudes |
| December 3rd, 2025 | Jakub R. Filipek (WFUW, Warszawa) | Twisted Abelian Differential Cohomology and Weakly Abelian Lie Groups |
| December 17th, 2025 | Rafał R. Suszek (KMMF, WFUW) | Stacky Dynamics in the Shadows of Principaloid Bundles |
| January 13th, 2026 | Nikita Nekrasov (SCGP, Stony Brook, New York) | Geometry of relativistic hydrodynamics I |
| January 14th, 2026 | Nikita Nekrasov (SCGP, Stony Brook, New York) | Geometry of relativistic hydrodynamics II |
| January 28th, 2026 | Cristian Ortiz (IME-USP, São Paulo) | TBA |
| February 25th, 2026 | Mikołaj Korzyński (CFT PAN) | TBA |
| March 11th, 2026 | ||
| March 25th, 2026 | ||
| April 8th, 2026 | ||
| April 22nd, 2026 | ||
| May 6th, 2026 | ||
| May 20th, 2026 | ||
| June 3rd, 2026 | ||