Oct. 12, 2022, 7:30 p.m.
Sitterzaal

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Cell deformation and mechanics of epithelial tissues

Jean François Joanny

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The mechanical properties of tissues can be studied either at a macroscopic scale of the tissue or at the mesoscopic scale of the cell. The macroscopic description must include the non-conservation of the cell number due to cell division and cell death and leads to a non-conventional hydrodynamic theory. At the mesoscopic scale, we use a so-called vertex model which starts from a geometrical description of an individual cell. The aim of the lecture is to show on a simple example how one can derive the macroscopic properties of the tissue by a coarse-graining of the mesoscopic vertex model. Our main result is an explicit calculation of the cell pressure in the homeostatic state of a confined growing tissue. We show that the homeostatic pressure can be negative and depends on the existence of mechanical residual stresses

Okay

Nov. 9, 2022, 7:30 p.m.
Sitterzaal

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Are we living in the matrix?

David Tong

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No. Obviously not. It's a daft question. But, buried underneath this daft question is an extremely interesting one: is it possible to simulate the known laws of physics on a computer? Remarkably, there is a mathematical theorem, due to Nielsen and Ninomiya, that says the answer is no. I'll explain this theorem, the underlying reasons for it, and some recent work attempting to circumvent it.

Okay

Nov. 30, 2022, 7:30 p.m.
Sitterzaal

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Quantum simulators: from the Fermi Hubbard model to quantum assisted NMR inference

Eugene Demler

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I will discuss recent progress of the optical lattice emulators of the Fermi Hubbard model. The new feature of these experiments is availability of snapshots of many-body states with single particle resolution. I will review new insights from these experiments on the properties of doped Mott insulators, including demonstration of magnetically mediated pairing. I will also present the idea of using quantum simulators to perform inference of NMR spectra for biological molecules. I will review recent experimental realization of this algorithm on a quantum computer using trapped ions. Prospects for scaling this approach to solving practically relevant problems will be discussed.

Okay