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Location: Meudon, France

Chalonge School Meudon Workshop 2012 “Warm Dark Matter Galaxy Formation in Agreement with Observations”

Ecole Internationale d’Astrophysique Daniel Chalonge

1. Summary: A Turning Point operated recently in the Dark Matter research: Warm Dark Matter (WDM) emerged impressively over Cold Dark Matter (CDM) as the leading Dark Matter candidate. WDM solves naturally the problems of CDM and agrees with the observations at small as well as large and cosmological scales. This workshop addresses WDM putting together astrophysical, cosmological and particle WDM, astronominal observations, theory and WDM numerical simulations which naturally reproduce the observations at all the scales. The Workshop addresses as well the experimental search for the WDM particle candidates (keV sterile neutrinos).

2. The New Dark Matter Situation Today: Warm Dark Matter (WDM) research is progressing fast, the subject is new and WDM essentially works, naturally reproducing the astronomical observations over all scales: small (galactic) and large (cosmological) scales (LambdaWDM). Astronomical evidence that Cold Dark Matter (LambdaCDM) and its proposed tailored cures do not work at small scales is staggering. Astrophysical constraints including Lyman alpha bounds put the sterile neutrino mass m in the range 1< m <13 keV. WDM predictions for EUCLID and PLANCK start to to be available. MARE and an adapted KATRIN experiment could detect a keV sterile neutrino. It will be a fantastic discovery to detect dark matter in a beta decay. A formidable WDM work to perform is ahead of us.

3. History, Context and the CDM crisis (abridged): This Workshop is the third of a new Chalonge series in Meudon dedicated to Dark Matter. The first Workshop of this series (June 2010) allowed to identify and understand the issues of the serious problems faced by Cold Dark Matter (CDM) to reproduce the galactic (and even cluster of galaxies) observations. The 2010 and 2011 Workshops served as well to verify and better understand the confusion in the CDM research, namely the increasing number of cyclic arguments, and ad-hoc mechanisms introduced in the CDM simulations over most of twenty years, in trying to deal with the CDM small scale crisis: Cusped profiles and overabundance of substructures are predicted by CDM. Too many satellites are predicted by CDM simulations while cored profiles and no such overabundant substructures are seen by astronomical observations. Read more on the www of this Workshop.

4. The Workshop addresses the last progresses made in Warm Dark Matter and the Universal and Non Universal properties of Galaxies. In the tradition of the Chalonge School, an effort of clarification and synthesis will be made by combining in a conceptual framework, theory, analytical, observational and numerical simulation results that reproduce observations.

The subject will be approached in a threefold way:
(I) Conceptual context and keV WDM particle candidates, sterle neutrinos
(II) Astronomical observations linked to the galaxy structural properties, surveys, clusters and to structure formation at different (large and small (galactic) scales).
(III) WDM Numerical simulations which reproduce observations at large and small (galactic) scales.

Recent progress in solving the Boltzmann-Vlasov equation to obtain the observed properties of galaxies (and clusters of galaxies). N-body numerical simulations with Warm Dark Matter. The surface density. The phase-space density. Particle model independent analysis of astrophysical dark matter. The impact of the mass of the dark matter particle on the small scale structure formation. The radial profiles and the Dark Matter distribution. Cored DM observed profiles. The keV scale Dark Matter (Warm Dark Matter): Observational and theoretical progresses. Large and small scale structure formation in agreement with observations at large and small (galactic) scales. The new serious dark matter candidate: Sterile neutrinos at the keV scale.

Sessions last for three full days in the beautiful green Meudon campus of Observatoire de Paris, where CIAS "Centre International d´Ateliers Scientifiques" is located. All sessions take place in the historic Château building, (built in 1706 by great architect Jules-Hardouin Mansart in orders by King Louis XIV for his son the Grand Dauphin).

The Meeting is open to all scientists interested in the subject. The format of the Meeting is intended to allow easy and fruitful mutual contact and communication.

Informations about the Workshop, participation information and background information are displayed at

Early Registration is strongly encouraged.

With compliments and kind regards,