Ecole Internationale Daniel Chalong

Workshop CIAS Meudon 2011



CIAS Observatoire de Paris, Château de Meudon, Meudon campus

8, 9 and 10 June 2011

Programme and Time Table (.pdf)

Practical informations (.pdf)

Click to download the poster (.pdf)

Programme and Lectures (.pdf)

List of Registered Participants (.pdf)

Album Photos

Highlights and Conclusions


A Turning Point in the Research of Dark Matter: Warm Dark Matter. Theory and Observations Recently, LambdaWDM (Warm Dark Matter) emerged impressively over LambdaCDM (Cold Dark Matter) whose small -galactic- scale (and even larger scale) problems are ever-increasing. LambdaWDM solves naturally the problems of LambdaCDM and agree with the observations at small as well as large and cosmological scales.

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. The subject will be approached in a threefold way:

(I) Conceptual context: Dark Matter in cosmology and astrophysics: perspective and prospective of the research in the subject: Theory and observations. The emergence of Warm (keV scale) Dark Matter from theory and observations.

(II) Astronomical observations linked to the galaxy structural properties and especially to the universal and non universal properties of galaxies: high quality rotation curves, kinematics, density profiles, gravitational lensing, small and large structures.

(III) Numerical simulations with Warm Dark Matter , large structures, structures and substructures.
Special attention will be payed to the astrophysical understanding of the dark matter problems, the use of analytic and numerical methods which determine the properties, the distribution and the nature of Warm Dark Matter.


TOPICS: Kinetic theory and the recent progress in solving the Boltzmann-Vlasov equation to obtain the observed universal properties of galaxies. N-body numerical simulations whith Warm dark Matter.

The dark matter surface density in galaxies.

The phase-space density of dark matter.

Particle model independent analysis of astrophysical dark matter.

The impact of the mass of the dark matter particle on the small scale structure formation and the choice of the initial conditions.

The radial profiles and the Dark Matter distribution. Cores versus Cusps.

The ever increasing problems of LambdaCDM.
The keV scale Dark Matter (Warm Dark Matter): Observational and theoretical progresses.

Large and small scale structure formation in agreement with observations at large scales and small (galactic) scales.

The new serious dark matter candidate: Sterile neutrinos at the keV scale


FORMAT: All Lectures are followed by a discussion. All participants are invited to take part in the discussions.

Enough time will be available for the discussions.

The Meeting is open to all scientists interested in the subject. Registration is mandatory. Registration information is given below.

The format of the Meeting is intended to allow easy and fruitful mutual contact and communication.

Sessions last for three full days in the beautiful and green Meudon campus of Observatoire de Paris in the historic Castle with the Great Dome building ("Château Grande Coupole") where CIAS (Centre International d´ Ateliers Scientifiques) is located.

All lectures and presentations will take place at the Castle Conference Room (Salle de Conferences du Château) in the historic Castle building.

All Coffee-Tea breaks will take place at the Urania Hall aside the castle conference room in the same building. The Registration desk and the Secretariat of the Workshop take place at the Urania Hall.

Discussions and working sessions all during the workshop will take place at the CIAS rooms aside the Urania Hall.

SOC et LOC :

Norma G. Sanchez, Héctor J de Vega, Maria Cristina Falvella.

Nicole Letourneur, Dominique Lopes, Aurelie Sevellec, Djilali Zidani.


Peter BIERMANN (MPI-Bonn, Germany & Univ of Alabama, Tuscaloosa, USA)
Astrophysical Evidences of Warm Dark Matter

Fedor BEZRUKOV (Ludwig-Maximilians-Universitat München, Germany)
Light sterile neutrino dark matter in extensions of the Standard Model

Christopher J.CONSELICE (School for Physics and Astronomy, University of Nottingham, UK)
Correlations between baryons and dark matter during galaxy formation

Pier Stefano CORASANITI (CNRS LUTH Observatoire de Paris, Meudon, France)
Theorical modeling of the halo mass function and halo bias: a path-integral approach to the Excursion Theory

Hector J. DE VEGA (CNRS LPTHE Univ de Paris VI, France)
Warm Dark Matter from theory and galaxy observations

Stefano ETTORI (INAF,Osservatorio Astronomico Bologna, Italy)
Mass profiles and concentrations in X-ray galaxy clusters

Frederic V.HESSMAN & Monika ZIEBART (Inst. F.Astrophysik, Georges-August-Univ.Göttingen Göttingen Germany)
The Bosma effect revisited - Correlations between th Interstellar Medium and Dark Matter in galaxies

Chanda J. JOG (Indian Institute of Science, Bangalore, India)
Prolate-shaped dark matter halo of the Milky Way deduced from flaring HI gas

Marco LOMBARDI (University of Milano, Italy)
Larson' laws and the universality of molecular cloud structures

Katarina MARKOVIC (Max-Planck-Ludwigs-Maximilians Universität, Munich, Garching, Germany )
Constraining Warm Dark Matter with future cosmic shear data

Alexander MERLE (Royal Institute of Technology KTH Stockholm, Sweden)
Neutrino model building and keV sterile neutrino Dark Matter

Christian MONI BIDIN (Universidad de Concepción, Departamento de Astromomia, Chile)
The lack of evidence of a Dark Matter disk in the Milky Way

Angelo NUCCIOTTI (INFN Milano Biccoca, Italy)
The MARE experiment in Milano Bicocca and its capabilities to measure the mass of light (active) and heavy (sterile) neutrinos

Henri Michel PLANA (Laboratorio de Astrofisica Teorica e Observacional, UESC Santa Cruz, Bahia, Brazil)
Mass Distribution in Groups of Galaxies

Oleg RUCHAYSKIY (CERN-Teory, Geneva, Switzerland)
Sterile neutrinos as dark matter candidates and the constraints on them from Lyman-alpha forest data

Paolo SALUCCI (SISSA-Astrophysics, Trieste, Italy)
Structural properties of Galaxies and Cored Density Profiles from Galaxy observations

Norma G. SANCHEZ (CNRS LERMA Observatoire de Paris, Paris, France)
Warm Dark Matter and Galaxy properties from primordial fluctuations and observations.

Joop SCHAYE (Leiden University, The Netherlands)
Dark matter haloes, central AGN black holes, and the effect of baryons on the clustering of matter

Patrick VALAGEAS (Inst. de Physique Théorique, Orme de Merisiers, CEA-Saclay, Gif-sur-Yvette, France)
Perturbation theories for large-scale structures

Shun ZHOU (Max-Planck-Heinsenberg Inst., Munich, Germany)
Supernova bound on keV-mass sterile neutrinos



Local and practical information can be found below.


The Meeting is open to all scientists interested in the subject but Registration is mandatory. Registration fee is 60 Euros. The registration fee covers the 6 coffee-tea breaks, the tickets for the 3 lunchs and the cocktail/reception. The registration fee must be paid cash to the Secretary of the Workshop (not by credit card, nor by check) at the registration desk on the 1st day of the Workshop (Wednesday 8 June 2011).
[The Lunch tickets you will receive at the Workshop Registration include for Each Lunch at the Observatory self-restaurant in Meudon the following six items: Entry/appetizer. Main course. French cheese or green salad. Dessert (cakes or fruits or yoghurt). Drink (wine, beer or mineral water or other soft drinks). Coffee or Tea . For Each item a variety of choices is proposed every day (meat, fish, chicken, vegetarian, with their garnitures). Also, one can skip one item and have instead another item twice].

Certificates of participation and receipts will be delivered by the Secretariat during the Workshop upon request.

Participants wishing to attend the Meeting should register in time, by on line registration and in any case           

BEFORE 1st MAY 2011

An automatic mail  is sent to you after your on line registration.


The LIST of Registered confirmed Participants will be posted in May.  BADGES for all registered confirmed participants in the list will be available at the Registration desk from Wednesday 8 June at 8:10 am.

Please wear your badge all during the Workshop, which will make easy your access and circulation within the Paris Observatory Meudon campus.


Workshop Secretariat:

We look  forward to seeing you in Meudon for a creative, fruitful and enjoying meeting.

Participants should make their reservations by their own. A list of hotels in Paris nearby Montparnasse station is provided below.


Welcome of the participants and Registration starts on wednesday 8 June at 8:00 am at the Urania Hall in the historic Meudon Castle ("Château de Meudon"). Tickets for lunch will be on sale at the registration desk from Tuesday morning.

Lectures start on Wednesday 8 JUNE at 8:00 am in the Castle ("Chateau") CIAS building .

We shall  strictly stick to the timetable during the whole meeting.

All lectures and events will start  at the indicated times sharp.

All sessions take place in the historic Castle ("Château" building) where CIAS is located ,

All COFFEE-TEA-MATE-CHAMPAGNE BREAKS take place in the Urania Hall in the CIAS Château building.

LUNCH is served at the Self-service Restaurant of Observatoire de Paris at Meudon (located very near from the "Château" building, inside the Meudon campus, around the pond).

The PHOTO of the group will be taken in the middle of one of the main entries of the "Chateau".

The COCKTAIL/RECEPTION for all participants and accompanying persons will be offered on FRIDAY 10 JUNE in the late afternoon at the terrasse (if weather allows it) aside Urania Hall; otherwise, inside the Castle.

Please Notice: The Workshop ends after the COCKTAIL/RECEPTION in the late afternoon of Friday 10 June. All participants and lecturers are expected to stay untill the end of the Meeting.

LOCATION : The entrance of the Observatoire de Paris at Meudon is 5, Place Jules Janssen, F-92 190 Meudon (see below how to reach Meudon).

Lunch is served at the Self-service Restaurant of Observatoire at Meudon (located very near from CIAS Castle, inside the Meudon campus, around the pond). The tickets for lunch will be available at the Conference registration desk from Thursday morning.

On Friday, there will be a Cocktail/Reception in the the late afternoon in the Urania Hall/terrasse.

The Observatoire Self-Service Restaurant is closed for dinner and on Saturdays /Sundays.

Some Restaurants are listed below.


Address : 5, Place Jules Janssen, F-92 190 Meudon .Tel: .Fax:

 Longitude : 2° 14' East . Latitude : 48° 48' North . Altitude : 162m

Meudon Observatory is located Place Jules Janssen , in Meudon at the top of the Avenue du Château.

By train. The best way for visitors to reach Meudon Observatory is from Paris-Montparnasse train station and to stop at Bellevue station (recommended stop). The travel duration by train from Paris Montparnasse to Bellevue station is about 12 minutes. Recommended way is the following:

By train (French railways - SNCF): At Paris-Montparnasse station, take the train going to Sèvres or to Versailles-Chantiers, Rambouillet, Chartres, (which frequency is every 15 min.). Make sure that the train stops at the Meudon or Bellevue stations. Get out at the 4th station: Bellevue (after Vanves-Malakoff, Clamart and Meudon stations).

Once outside Bellevue station, turn left (passing the church aside the station) and take the green Avenue du Château bordered by trees: the entrance of the Observatory is on the top of the hill. About a 10/15 minutes walk to reach the gates of the Observatory. [There is also a mini bus (circular local line) from the Bellevue station to the Observatory].

If you stop at the Meudon station: outside the station, turn to the right, after 200 m turn again to the right to take avenue Corbeiller [where the Meudon Municipality is located (Mairie de Meudon), ahead up to the top of the hill along avenue Corbeiller, rue Jacqueminot lined with stately chestnut trees.

Once arrived, use the map of the Observatory campus: Chateau Grande Coupole CIAS where the meeting takes place, (building 9 in the map) is on the terrasse (take the staircase in the garden at the left after the entry and then at the left straight on the road along the terrasse bordered by the chestnut trees.

By car there are 2 possible routes : Take the périphérique, exit at Quai d Issy, then go towards Issy les Moulineaux, Sèvres and finally Meudon Take N 118, from the Pont de Sèvres, going towards Chartres Orléans, exiting at Meudon Sèvres and then going towards Meudon.


Hôtel du Maine; 16 Rue Maison Dieu, Paris, 75014

Hôtel Ibis; 71 boulevard de Vaugirard, Paris, 75015

Hôtel Montparnasse-Daguerre; 94 rue Daguerre, Paris, 75014

Hôtel Campanile - Maine Montparnasse; 146 Avenue du Maine, Paris, 75014

Hotel l'Aiglon, 232 boulevard Raspail, metro Raspail, tel. 33 (0) 143208242,

Hotel Delambre 35 rue Delambre, metro Edgar Quinet, tel. 33 (0) 145389176,

Hotel de la Paix, 225 boulevard Raspail, metro Raspail,tel. 33 (0) 143353263,

Mercure Raspail Montparnasse, 207 bd Raspail, Paris 75014 .Tel.33 (0). 14320-6294, fax 33(0).14327-3969.

Hotel du Midi, 4, Av. René Coty, Paris 75014. Metro : Denfert-Rochereau. tel. 33(0).14327-2325. fax 33(0).14321-2458.

FIAP Jean Monnet, 30 rue Cabanis, 75014 Paris
Metro Glaciere or Saint-Jacques

Tel. 33(0)1-4313-1700. Fax 33(0)1-4581-6391.


La Closerie des Lilas, 171, boulevard Montparnasse. Tel. 014051-3450.Open everyday till 1 am.

Formerly a Café littéraire had as customers Baudelaire, Verlaine, Gide, Jarry, Apollinaire, Modigliani, Hemingway, Lenin and probably Trotsky. Keeps a litterary crowd of customers like Philippe Sollers. The present chef Jean-Pierre Cassagne has renovated the house and the excellent meals. Besides the restaurant there is `brasserie' where meals are alsoserved. Menu 43 euros (including wine), à la carte 90 euros.

La Rotonde Montparnasse, 105 bd. Montparnasse, Tel. 0143266884. Open every day from 12 am till 1pm. Typical parisian restaurant since 1911.  Seafood, oysters, famous Salers entrecote, good fish, selected Auvergne cheese and good desserts. Landmark of the Montparnasse district had as regular customers artists, musicians, writers and politicians: Modigliani, Picasso, Soutine, Cocteau, Diaghilev, Debussy, Nijinski, Stravinsky, Man Ray (and Kiki), Breton, Aragon, Prevert, Queneau, Hemingway, Gershwin, Henry Miller, Scott Fitzgerald. Meetings of Trotsky with fellow bolcheviks in the first floor room to organize the 1917 russian revolution were often interrupted by the french police. Menus 35 and 43 euros.

La Coupole, 102 bd. Montparnasse, Tel. 0143201420.   Open every day from 12 am till 1 pm.

Typical Art Deco parisian restaurant open in 1927. Seafood, salmon rilletes, abundant sauerkraut, fresh codfish a la plancha, entrecote with french frites, lamb curry india style, excellent desserts. Among regular customers in the past: Cocteau, Prevert, Sartre, Beauvoir, Picasso (who met here Dora Maar), Matisse, Piaf, Montand.



At present the Observatoire de Paris owns three campuses: Paris, Meudon and the radioastronomy station at Nançay. More than 700 scientists, technicians and administrative staff work there.

The history of the present Meudon Castle (Château de Meudon) starts several centuries ago.

The new Château de Meudon over where the cupola of the Meudon Observatory is installed was built in 1706 by the great architect Jules-Hardouin Mansart in orders by King Louis XIV for his son the Grand Dauphin. This was the last important project realized by Mansart. The gardens and water fontaines were constructed under the plans by Le Nôtre. Important visitors stayed in the Château de Meudon in the XVIII century as the Zar of Russia Peter the Great and the King of Poland Stanislas Leszczyski.

After the French Revolution, a workshop to construct military balloons was settled in the area. These balloons played an important rôle in the Fleurus battle against Austria in 1794. Napoleon restaured the Château de Meudon and the Empress Marie-Louise and their son (the King of Rome) lived in the Castle.

The terrasse was used by the prussians to shell Paris during the siege of 1870. The Château de Meudon took fire at that time.

In 1876 the astronomer Jules Janssen created the Meudon Observatory and in 1893 a refraction telescope was installed over in the Castle.



Museums at Meudon

Musée - Atelier Rodin , Villa des Brillants Beaux-Arts. House-workshop and garden of the artist. Original casts of the work of the great sculptor. The Tomb of the sculptor with one his versions of the "The Thinker".

Musée d'Art et d'Histoire de la Ville de Meudon Beaux-Arts - Histoire

Fondation Arp à Clamart 1.8 km (sud-est limit of the Meudon forest). House-workshop and garden of the artists Jean Arp and Sophie Taeuber who designed the house in 1960. Epured Cubism. Abstraction and Dadaisme. Kandinsky "Blaue Reiter"mouvement of 1912. Max Ernst, Tristan Tzara, Constructivist Théo Van Doesburg. Original and asttonishing constructions in the "Triangle des Châtaigniers" (Chestnuts Triangle) designed by Chemetov, Déroche and Lecaron architects.


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