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Location: Paris, France

16th Paris Cosmology Colloquium “The New Standard Model of the Universe: Lambda Warm Dark Matter. Theory and Observations”

Ecole Internationale d’Astrophysique Daniel Chalonge

Chalonge School 16th Paris Cosmology Colloquium 2012 “The New Standard Model of the Universe: Lambda Warm Dark Matter. Theory and Observations”

Recently, Warm (keV scale) Dark Matter emerged impressively over CDM (Cold Dark Matter) as the leading Dark Matter candidate. Astronomical evidence that Cold Dark Matter (LambdaCDM) and its proposed tailored cures do not work at small scales is staggering. LambdaWDM solves naturally the problems of LambdaCDM and agrees remarkably well with the observations at small as well as large and cosmological scales. LambdaWDM numerical simulations naturally agree with observations at all scales, in contrast to LambdaCDM simulations which only agree at large scales. In the context of this new Dark Matter situation, which implies novelties in the astrophysical, cosmological and keV particle physics context, this 16th Paris Colloquium 2012 is devoted to the LambdaWDM Standard Model of the Universe. In summary, the aim of the meeting is to put together real data: cosmological, astrophysical, particle, nuclear physics data, and hard theory predictive approach connected to them in the framework of the Lambda WDM Standard Model of the Universe.

This Colloquium is within the astrofundamental physics spirit of the Chalonge School, focalised on recent observational and theoretical progress in the CMB, dark matter, dark energy, structure formation, and the theory of the early universe inflation with predictive power in the context of the LambdaWDM Standard Model of the Universe. The Colloquium addresses as well the theory and experimental search for the WDM particle physics candidates (keV sterile neutrinos). 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.

Observational and theoretical progress on the nature of dark matter: keV scale warm dark matter. Cored density profiles in agreement with observations. Large and small scale structure formation in agreement with observations at large scales and small (galactic) scales. Warm (keV scale) dark matter from theory and observations. Warm (keV scale) dark matter N-body simulations in agreement with observations. Neutrinos in astrophysics and cosmology. The new serious dark matter candidate: Sterile neutrinos at the keV scale.Neutrinos mass bounds from cosmological data and from high precision beta decay experiments. Dark energy: cosmological constant: the quantum energy of the cosmological vacuum. The analysis of the CMB+LSS+SN data with the effective (Ginsburg-Landau) effective theory of inflation: New Inflation (double well inflaton potential) strongly favored by the CMB + LSS + SN data. The presence of the lower bound for the primordial gravitons (non vanishing tensor to scalar ratio r) with the present CMB+LSS+SN data. CMB news and polarization. Forecasts and Planck results, and Other Topics.

Sessions last for three days in the beautiful Parisian campus of Observatoire de Paris (built on orders from Colbert and to plans by Claude Perrault from 1667 to 1672). All sessions take place at the Salle Cassini (Cassini Hall) in the historic Perrault building (“Bâtiment Perrault”) of Observatoire de Paris HQ, just upstairs “Salle du Conseil” (Council Room). All Coffee-Tea breaks take place at the “Salle du Conseil” under the portraits of Laplace, Le Verrier, Lalande, Arago, Delambre and Louis XIV. The Registration desk and the Secretariat of the Colloquium take place at the “Grande Galerie” (Great Gallery) just aside facing Salle du Conseil

An exhibition at the “Grand Galerie” (Great Gallery) and “Salle Cassini” (Cassini Hall) will retrace the 21 years of activity of the Chalonge School and “the Golden Days” in “Astrofundamental Physics”: The Construction of the Standard Model Of the Universe. The World High Altitude Observatories Network: World Cultural and Scientific Heritage. All Lectures are followed by a discussion. All participants are invited to take part in the discussions. The Meeting is open to all scientists interested in the subject.

Information about this Colloquium, participation information and background information are displayed at the Chalonge School web site:

Information on the previous Paris Cosmology Colloquia and of the school events (lecturers, lists of participants, lecture pdf files and photos during the Colloquia) are available at

Early registration is strongly encouraged.

With compliments and kind regards,