2018-2019 ICFP seminar Program

Accès rapides

Accès rapides

Prochain Séminaire de la FIP :
Accéder au programme

Retrouvez toutes les informations pour vos stages :
Stages L3
Stages M1 ICFP
Stages M2 ICFP

Actualités : Séminaire de Recherche ICFP
du 6 au 10 novembre 2017 :

Retrouvez le programme complet

Emploi du temps 2017-2018 :
Emploi du temps L3
Emploi du temps M1 ICFP
Emploi du temps M2 ICFP

Contact - Secrétariat de l’enseignement :
Tél : 01 44 32 35 60
enseignement@phys.ens.fr

The seminar takes place on Tuesday, at 5:15pm.

 September 25 : Arnaud Landragin

LNE-SYRTE, Observatoire de Paris
Atom interferometry for high sensitivity in inertial measurements

Atom interferometry is based on the wave-matter duality principle, stated by Louis de Broglie. In practice, most of the atom interferometers are based on the manipulation of the atomic wave-packets (splitting, deflection) by light. Since the pioneering experiments of 1991, atom interferometry has established as a unique tool for precision measurements of fundamental constants and of gravito- inertial effects. Atom interferometry covers multiple applications in metrology, inertial navigation, geophysics, tests of fundamental physics, and has been proposed for gravitational wave detection. Indeed, atom interferometry combines both intrinsic high sensitivity and accuracy thanks to the high level of control of the atom-laser interaction. Two main classes of interferometers are studies : interferometers with atoms in free fall, which already achieve state of the art performances, and interferometers trapped or guided atoms, more prospective and opening for new applications. I will illustrate theses developments through different projects we are carrying.

 October 9 : M1 interships

Oral defenses of two M1 internships

Joris Verstraten
Laser system for quantum gas microscopy of ultracold molecules
MIT, USA

Paul Robin
Rotating paint catenaries : investigating a technique used by Jackson Pollock
Cambridge University, UK

 November 6 : Thomas Gregor

Institut Pasteur
Physics problems in early embryonic development

One of the most beautiful phenomena in nature is the emergence of a fully formed, highly structured organism from a single undifferentiated cell, the fertilized egg. Over the past decades, biologists have shown that in many cases the "blueprint" for the body is laid out with surprising speed and is readable as variations in the concentration of particular molecules (the “expression levels” of particular genes). In the fruit fly, we know the identity of essentially all the relevant molecules. As we try to understand how these molecules interact to form the patterns that we recognize as characteristic of the mature organism, we face a number of physics problems :

How can spatial patterns in the concentration of these molecules scale with the size of the egg, so that organisms of different sizes have similar proportions ? What insures that the spatial patterns are reproducible from one embryo to the next ? Since the concentrations of all the relevant molecules are small, does the random behavior of individual molecules set a limit to the precision with which patterns can be constructed ?

Although the phenomena of life are beautiful, one might worry that these systems are just too complicated and messy to yield to the physicists’ desire for explanation in terms of powerful general principles. For the past several years, a small group of us have been struggling with these problems in the context of the fruit fly embryo. To our delight, we have been able to banish much of the messiness, and to reveal some remarkably precise and reproducible phenomena. In particular, the first crucial step in the construction of the blueprint really does involve the detection of concentration differences so small that they are close to the physical limits set by the random arrival of individual molecules at their targets. This problem may be so serious that the whole system for constructing the blueprint has to be tuned to maximize how much signal can be transmitted against the inevitable background of noise, and this idea of tuning or optimization can be turned into a precise theoretical principle from which we can actually predict some aspects of how the system works. Parallel questions of noise, reproducibility and information transmission arise in many different biological systems.

 November 20 : Clément Sayrin

Laboratoire Kastler Brossel, Collège de France

 December 4 : Jean-Philippe Bouchaud

Capital Fund Management

 December 18 : Bruno Andreotti

  January 15 : Takis Kontos

Laboratoire Pierre Aigrain, ENS Paris

Accès rapides

Prochain Séminaire de la FIP :
Accéder au programme

Retrouvez toutes les informations pour vos stages :
Stages L3
Stages M1 ICFP
Stages M2 ICFP

Actualités : Séminaire de Recherche ICFP
du 6 au 10 novembre 2017 :

Retrouvez le programme complet

Emploi du temps 2017-2018 :
Emploi du temps L3
Emploi du temps M1 ICFP
Emploi du temps M2 ICFP

Contact - Secrétariat de l’enseignement :
Tél : 01 44 32 35 60
enseignement@phys.ens.fr