2019-2020 ICFP seminar Program

Quick links

Quick links

Next student seminar :
Access to the program

Here you can find information about your internships:
Experimental Internship - Undergraduate program
Master ICFP first year Internship
Master ICFP second year Internship

News : ICFP Research seminars
January 7 - 11, 2019 :

All information about the program

Calendars :
Undergraduate program
Master ICFP 1st year
Master ICFP 2nd year

Contact us - Student support and Graduate School office :
Tél : 01 44 32 35 60
enseignement@phys.ens.fr

The seminar takes place on Tuesday, at 5:15pm in room CONF 4.

 September 24: M1 interships

Oral defenses of two M1 internships

Grégoire Le Lay
Manchester Centre for Nonlinear Dynamics
Bubble propagation in a Hele–Shaw channel with centred constriction
We study the propagation of air bubbles in an oil-filled Hele—Shaw channel presenting a centred constriction. We show that the bubbles can exhibit a variety of different behaviours, observed both in the experiments and in the numerical simulations. We interpret the transient evolution of the shape and speed of the bubbles using a dynamical systems approach : the bubbles transiently explore weakly unstable steady modes and we are able to understand the evolution of its behaviour using a numerical bifurcation diagram. During this transient evolution, the bubble may break-up into two or more smaller bubbles, changing the topology of the dynamical system.

Ancel Larzul
Stockholm University, Astronomy department
Cosmology from the 21-cm signal through the Alcock-Paczynzski effect
The hyperfine transition at 21-cm of neutral hydrogen constitutes a very promising probe of the epoch of reionization, when the first stars and galaxies lighted up and ionized the surrounding intergalactic medium. The Alcock-Paczynski effect is a geometrical effect that can be used to probe cosmological parameters and that can potentially be seen in the brightness temperature power spectrum of the 21-cm line. However it is not the only line of sight effect to consider when analysing 21-cm data: redshift space distortions (an additional redshift due to the proper motion of the gas that alter our measure of distances) turn out to play an important role in modelling the shape of the observed signal. The aim of this study is to compare the strength of the Alcock-Paczynski effect to redshift space distortions in the context of the 21-cm line and see if the Alcock-Paczynski effect could be detected by SKA1-Low. We simulate a mock observation and interpret it with a wrong cosmology to produce the Alcock-Paczynski effect. We find that even though redshift space distortions dominate the anisotropies in the signal the two line of sight effects are in principle distinguishable. However, it is unlikely that it is possible to separate them in practice since it would require a detailed knowledge of the history of reionization and of the properties of the first galaxies to predict very precisely the brightness temperature power spectrum.

 October 22: Tristan Briant

Laboratoire Kastler Brossel

 November 5: Preden Roulleau & Carles Altimiras

Service de Physique de l’Etat Condensé, CEA Saclay

 November 26: Bernard Plaçais

Laboratoire de physique de l’ENS

 December 10: Jean-François Rupprecht & Hervé Rouault

Centre Physique Théorique (Université Aix-Marseille, Luminy campus)

 December 17: Marco Saitta & Carlo Sirtori

Laboratoire de physique de l’ENS

Quick links

Next student seminar :
Access to the program

Here you can find information about your internships:
Experimental Internship - Undergraduate program
Master ICFP first year Internship
Master ICFP second year Internship

News : ICFP Research seminars
January 7 - 11, 2019 :

All information about the program

Calendars :
Undergraduate program
Master ICFP 1st year
Master ICFP 2nd year

Contact us - Student support and Graduate School office :
Tél : 01 44 32 35 60
enseignement@phys.ens.fr