Name: Hydrodynamics at All Scales
Start: 2023-09-04T09:00:00+02:00
End: 2023-09-29T18:00:00+02:00
Location: Albano Building 3

Monday, 4 September 2023
10:00 Hydrodynamics: a theoretical physicist’s perspective - Pavel Kovtun
Hydrodynamics: a theoretical physicist’s perspective
- Pavel Kovtun
10:00 - 11:30
Room: Albano 3: 4205 - SU Conference Room (40 seats)
11:30 Non-invertible symmetries, chiral magnetohydrodynamics and lattice QCD - Napat Poovuttikul
Non-invertible symmetries, chiral magnetohydrodynamics and lattice QCD
- Napat Poovuttikul
11:30 - 12:30
Room: Albano 3: 4205 - SU Conference Room (40 seats)
Tuesday, 5 September 2023
10:00 Hydrodynamics of active matter: from motile organisms to non-reciprocal magnets - Sriram Ramaswamy
Hydrodynamics of active matter: from motile organisms to non-reciprocal magnets
- Sriram Ramaswamy
10:00 - 11:30
Room: Albano 3: 4205 - SU Conference Room (40 seats) I will present a theoretical framework for building symmetry-based coarse-grained descriptions of systems whose constituents receive a sustained free-energy supply that they convert to work. I'll summarise progress in the ﬁeld and offer a prospective outlook on its future. I hope to build bridges to other parts of the large enterprise of hydrodynamic approaches to nonequilibrium physics.
11:30 Unﬂappable ﬂocks at ﬂuid interfaces - Ananyo Maitra
Unﬂappable ﬂocks at ﬂuid interfaces
- Ananyo Maitra
11:30 - 12:30
Room: Albano 3: 4205 - SU Conference Room (40 seats) More than two decades ago it was shown [PRL 89, 058101 (2002)] that ﬂocks in ﬂuids are unstable at least in the viscous limit. This instability of uniaxial orientational order in bulk active ﬂuids is an inescapable consequence of the conservation of total mass and momentum. In this talk, I will use the ﬂuctuating, broken-symmetry hydrodynamic framework for internally driven (i.e., active) systems to show that the very activity that conspires with conservation laws to destroy bulk nematic or polar ordering can instead promote it, with radically suppressed ﬂuctuations, in a layer of active ﬂuid in contact with a solid or ﬂuid medium. These escapes from the bulk instability and active stabilisation of uniaxial order via dynamical, nonequilibrium analogues of the Anderson-Higgs mechanism, would be impossible in equilibrium systems in which the existence of order and all equal-time correlators are independent of dynamics and the presence or absence of conservation laws.
17:00 Reception
Reception
17:00 - 19:00
Wednesday, 6 September 2023
10:00 Geometrical and topological mysteries of intracellular membranes - Gregory Huber
Geometrical and topological mysteries of intracellular membranes
- Gregory Huber
10:00 - 11:30
Room: Albano 3: 4205 - SU Conference Room (40 seats)
11:30 Elastic membrane hydrodynamics - Varghese Mathai
Elastic membrane hydrodynamics
- Varghese Mathai
11:30 - 12:30
Room: Albano 3: 4205 - SU Conference Room (40 seats)
Thursday, 7 September 2023
10:00 Beyond Drude transport in hydrodynamic metals - Ashish Shukla
Beyond Drude transport in hydrodynamic metals
- Ashish Shukla
10:00 - 11:00
Room: Albano 3: 4205 - SU Conference Room (40 seats) Hydrodynamics provides an effective macroscopic description for systems near thermal equilibrium. In hydrodynamic metals, due to the weak explicit breaking of translation invariance from impurity and/or phonon scattering, momentum relaxes slowly with a certain rate, which formally appears on the right-hand side of the momentum dynamical equation and causes a Drude-like peak in the thermoelectric conductivities. In this talk, I will discuss a systematic approach for constructing a hydrodynamic theory which incorporates momentum-relaxing gradient corrections beyond Drude i.e. arising at subleading order in the gradient expansion. The subleading terms arise at the same order as the shear and bulk viscosities. They effectively renormalize the weight of the Drude pole in the thermoelectric conductivities, and contribute to the dc conductivities at the same order as the incoherent conductivities. Our model is able to perfectly capture the transport properties of strongly-coupled holographic metallic phases with broken translation invariance.
11:00 Surprises in Fermi liquid theory: Anomalously long lifetimes in 2D systems - Johannes Hoffman
Surprises in Fermi liquid theory: Anomalously long lifetimes in 2D systems
- Johannes Hoffman
11:00 - 12:00
Room: Albano 3: 4205 - SU Conference Room (40 seats) I will give an introduction to transport phenomena and transport calculations in non-relativistic Fermi liquids. Such systems encompass interacting electron gases in the hydrodynamic regime, which has recently been accessed experimentally, but also atomic quantum gases. In particular, I will present calculations of the shear viscosity within kinetic theory at ﬁnite temperature. I will then discuss in more detail the structure of quasiparticle scattering in the presence of a Fermi surface in two-dimensional systems, which reveals a parity-dependence of relaxation rates. Such an odd-even effect gives rise to a new transport regime with long-lived odd-parity modes in addition to hydrodynamic ones, and the talk will conclude by discussing signatures of this regime in the collective mode spectrum.
Friday, 8 September 2023
10:00 Hydrodynamics of pseudo-Goldstones and singular Goldstones - Ruben Lier
Hydrodynamics of pseudo-Goldstones and singular Goldstones
- Ruben Lier
10:00 - 11:00
Room: Albano 3: 4205 - SU Conference Room (40 seats) At all scales, phases of matter can be found which can be understood from the point of view of spontaneous symmetry breaking. For such phases of matter, it is possible to formulate an adequate hydrodynamic description by including Goldstone ﬁelds. In my seminar, I will consider ways in which damped hydrodynamics can arise when the spontaneous symmetry breaking is undermined weakly. This undermining can happen either through explicit symmetry breaking, which gives rise to pseudo-Goldstones, or through topological defects, which give rise to singular Goldstones. I will then discuss how to systematically construct the most general hydrodynamic theory of pseudo-Goldstones and singular Goldstones and what are the distinct effects on transport.
11:00 Hydrodynamics of a relativistic charged ﬂuid in the presence of a periodically modulated chemical potential - Nicolas Chagnet
Hydrodynamics of a relativistic charged ﬂuid in the presence of a periodically modulated chemical potential
- Nicolas Chagnet
11:00 - 12:00
Room: Albano 3: 4205 - SU Conference Room (40 seats) We study charged relativistic hydrodynamics driven by an external chemical potential made periodic in order to mimick the charge modulation generated by an ionic lattice. The background periodicity ﬂuctuations are mixing Bloch waves rather than independent single momentum Fourier waves. The modes at momenta separated by integer multiples of the modulation wavevector interact and lead to novel physical effects which bear resemblance to the physics of cuprates. We connect our results to explicit realizations in AdS/CFT models with an outlook towards condensed matter applications.
Saturday, 9 September 2023
Sunday, 10 September 2023

Monday, 25 September 2023
Tuesday, 26 September 2023
Wednesday, 27 September 2023
Thursday, 28 September 2023
Friday, 29 September 2023