Leiden University
Colloquium Ehrenfestii 2017


COLLOQUIUM EHRENFESTII 2017

initiated by Paul Ehrenfest in 1912
currently organized by Vincenzo Vitelli & Koenraad Schalm (read about its history)


Meal reservation form

14 June

Renata Kallosh (Lorentz Professor)

From Planck to Escher

The recent observations of the Cosmic Microwave Background by the Planck satellite strongly support the standard cosmological model, defined by just a few independent parameters. Two of them in particular still require a theoretical explanation: the small deviation from scale invariance in the power spectrum of the initial density fluctuations, and the level of inflationary gravitational waves, detectable through B-mode polarization in the CMB. Following an introduction to inflationary cosmology, I will describe a recently developed class of inflationary models, motivated by maximal supersymmetry and string theory, that gives specific targets for future B-mode experiments. These models are based on the hyperbolic geometry of the Poincare disk, which is beautifully represented by Escher's picture Circle Limit IV.


The Colloquium Ehrenfestii takes place Wednesday evenings starting at 19:30 hours in the main auditorium of the Oort building. Before the Colloquium, there is a common dinner in the canteen located on the ground floor of the Oort building. This dinner starts at 18:00 hours sharp and is free of charge, under the condition that one attends the colloquium and that one has made a reservation before noon on the Tuesday preceding the colloquium. [Registration may close earlier, when 80 persons have signed up]

Colloquium Ehrenfestii 2017

1 Feb

Leo Radzihovsky (Boulder)

Chiral symmetry breaking, emergent Higgs mechanism, and critical matter

15 Feb

Yossi Avron (Technion)

The geometry of non-dissipative transport: From conductance to viscosity

1 Mar

Oleg Lavrentovich (Kent State)

Dynamics of colloids in liquid crystals

8 Mar

Anne Davis (Cambridge)

The accelerating Universe

5 Apr

Jacques Prost (Curie Institute)

Long-time tissue dynamics and multicellular spheroids

19 Apr

Cristina Marchetti (Syracuse)

Active Matter: from colloids to living cells

10 May

Michael Berry (Bristol)

Variations on a theme of Aharonov and Bohm

31 May

Julia Yeomans (Oxford)

Topology in biology

14 Jun

Renata Kallosh (Lorentz Professor)

From Planck to Escher

Programs from previous years

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