Nonlinear Cosmology Programme 2003 /
Observatoire de la Côte d'Azur |

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## Nonlinear Cosmology Programme 2003 (NCP2003)Observatoire de la Côte d'Azur, Nice, France, May 15 to September 15, 2003. This is a very informal theoretical cosmology programme to be attended by cosmologists and specialists in nonlinear dynamics (physicists and mathematicians). Generally the programme is devoted to questions in cosmology for which the use of recent advances in nonlinear dynamics is expected to play a crucial role. Among the possible topics the following two may be stressed: - Improve the Monge-Ampère-Kantorovich (MAK) reconstruction technique, recently introduced by Frisch, Matarrese, Mohayaee and Sobolevsky [Nature 417, 260-262 (16 May 2002)], to handle full gravitational effects on smaller scales (basically switch from using the adhesion model to using the full Euler-Poisson equation). We have recently shown that Euler-Poisson in an expanding universe gives a unique reconstruction when initial and final densities are prescribed (and nothing is prescribed about the velocities) and have started thinking about algorithmic implementation (see Brenier, Frisch, Hénon, Loeper, Matarrese, Mohayaee and Sobolevskii (astro-ph/0304214)). The practical problem is to find suitable algorithms able to handle the very large data sets expected within a few years (SDSS, 2DF, etc).
- Analyse, as deeply as possible, the mechanisms which
prevent multistreaming from becoming too important.
Multistreaming is
**the**mechanism which prevents uniqueness of the reconstruction. Of course, this problem is closely connected with the understanding of why the adhesion (Burgers) model is somewhat better than one would naively expect. For example, during the programme we could look for small-scale instabilities leading to a kind of eddy viscosity which in turn can suppress large-scale multi-streaming (a suggestion of E. Spiegel). For such investigations we shall probably use bifurcation theory (near the time of first particle crossing), multi-scale techniques, N-body simulations and wavelet decompositions.
This programme is made possible by support from the French Ministry of Education, "CNRS Programme National de Cosmologie," the Observatoire de la Côte d'Azur and its Departments Cassini and Cerga. ## List of participantsThe emails are given with a French-flavoured anti-spam precaution: AROBASQUE stands for the "at" sign, and POINT means just "dot". Local telephone numbers in the observatory are indicated only for those participants that are actually present. (J. Silk and B. Tully are also guests of José Pacheco) - I. Arad: "Dark matter halos, phase-space density measurements"
- E. Aurell: "A paper of N. Antonov (astro-ph/0308369)"
- F. Bernardeau: "Can dark matter caustics exist in galaxy or cluster halos?" (proposed theme of discussion)
- L. Biferale: "Turbulence with small-scale forcing"
- E. Branchini: "Dark matter substructures and annihilation signatures in the local group"
- T. Buchert: "Stabilization of large-scale structure by adhesive gravitational clustering"
- S. Colombi: "Techniques for solving the Vlasov-Poisson equations: the polygon algorithm"
- A. Dominguez: "Adhesion-like models of the gravitational instability derived via coarse-graining"
- U. Frisch: "Reconstruction"
- J. Gaite: "Formation of cosmological structures: turbulence and fractals"
- S. Gurbatov: "The inner structure of a Zel'dovich pancake"
- B. Hasslacher: "New physics at 3×10
^{-32}Mpc ?" - R. Juszkiewicz: "Statistics and dynamics of the cosmological density and velocity fields"
- G. Loeper: "The inverse problem for the Euler-Poisson system in cosmology"
- S. Matarrese: "Non-gaussian signals from the early Universe"
- R. Mohayaee: "A Monge-Ampère-Kantorovich reconstruction of primordial Universe"
- L. Moscardini: "New models for the radial distributions of dark matter and gas in high-resolution hydro-simulations"
- J. de Freitas Pacheco: "The origin of the angular momentum of galaxies"
- S. Shandarin: "Dynamics and morphology of the large-scale structure"
- J. Silk: "Current issues in galaxy formation theory"
- A. Starobinsky: "Caustics formation in tachyon matter cosmology"
- R. Triay: "A not so 'linear regime' of structures formation"
- B. Tully: "Relating Theory to Observations"
- P. Valageas: "Dynamics of gravitational clustering: a steepest-descent method"
## Workshops## The typical day schedule9.30-10.00: Coffee10.00-13.00: Talks and lectures13.00-14.00: Lunch14.00-16.00: Discussion session16.00-16.30: Tea
## Workshop 1 (June 30 to July 5)## ProgrammeFor the titles of talks see above. Monday, June 30 (only afternoon) Tuesday, July 1 Wednesday, July 2 Thursday, July 3 Friday, July 4 ## Workshop 2 (August 26-28)## ProgrammeFor the titles of talks see above. Tuesday, August 26 Wednesday, August 27 Thursday, August 28 ## VenueThe programme will be taking place at the Nice site of the Observatoire de la Côte d'Azur, mostly in the meeting room next to the library (Pavillon Henri Chrétien). General information on the Observatoire is available here and here (in French). ## Survival hints## AccommodationMost long-term participants will be accommodated at: Résidence de tourisme "Lou Pantai" A map is available here.
The simplest way to reach the Résidence, coming from the
airport, is to drive along the sea (Promenade des Anglais)
until you reach boulevard Gambetta where you make a left;
after about 2 km turn right on boulevard Joseph Garnier;
after 200 m to 300 m turn left on boulevard Auguste
Raynaud. The Résidence is at number 19 on the left. There
is a parking, accessible only after having asked at the
check-in ( If you are coming by car using the motorway A8, exit at "Nice Nord" and drive south on boulevard Gorbella which goes over into the boulevard Auguste Raynaud. The Résidence is then on the right (the distance from the motorway is about 1.5 km). The telephone is +33-4 93 82 47 32 (from France 04 93 82 47 32, see also calling hints below). If you are able to speak to the Director (Mrs. McUmber), she knows fluent English. This may be useful if a significant unexpected delay happens (e.g. missing a plane connection). [If needed you can also reach her on her mobile at 06 88 42 65 32.] The normal hours of the Résidence are 9 to 18 Monday-Friday. Arrival on Saturday or outside of the normal hours requires special arrangement with Mrs. McUmber. Please, avoid arriving on Sunday. At arrival you will be told the telephone number at which your apartement can be called directly (from abroad replace 04 93 ## ## ## by +33-4 93 ## ## ##). You will be able to make direct outgoing calls by dialing 0, followed by the regular number (they will be billed to your account; it may be significantly cheaper to use a prepaid telephone card).
Many short-term participants will be accommodated at one of two hotels, the Best Western Hotel Nautica or Hôtel Helvétique: Best
Western Hotel Nautica A map is available here. The hotel is situated about 250 m from Gare Riquier. The telephone is +33 4 92 00 21 21 (04 92 00 21 21 from France). The negotiated special rate per night (including tax and breakfast) is 64.76 Euro and free parking is provided. Hôtel
Helvétique A map is available here. The hotel is situated in about 2 km from Gare Riquier, there is a bus connection as explained below. The telephone is +33 4 93 62 15 55 (04 93 62 15 55 from France). The negotiated special rate per night (including tax and breakfast) is about 61 Euro. ## Getting to the Observatoire
Travel time from the Résidence Lou Pantai to Riquier: 30-45 min depending on traffic, from Riquier to Observatoire: 10 min (another 7 min needed to walk up to the "Pavillon Henri Chretien" inside the Observatoire). Hence total time door to door should be between 1 h and 1 h 30 min. There is an alternative method where you walk from the Résidence to the Nice main train station (Nice Ville), which takes about 20 min, and then take one of the frequent local trains (direction Vintimille) which reaches the Riquier station (Gare Riquier) in 4 min.
Note that one can walk up from Gare Riquier to the Observatoire by a nice and steep path in 40 to 90 min depending on your shape (ask a knowledgeable person to show you the first time: not so easy to find).
## The schedule of bus 74departure Riquier Mon, Tue, Thu, Fri 6:50, 7:20, 7:50, 8:10, 8:45, 9:15, 9:50, 10:10, 11:00, 11:20, 12:05, 12:45, 13:10, 14:00, 14:400, 15:00, 15:50, 16:30, 17:05, 17:35, 18:00, 18:30, 19:00, 19:30. Return from Observatoire: 10:00, 10:30, 11:10, 11:35, 12:20, 13:00 13:25, 14:20, 14:50, 15:20, 16:05, 16:30, 17:20, 17:45, 18:15, 18:45, 19:15, 19:45 (better to show up 5 min early since bus may be early) Wed, Sat. and period of school holidays (includes July and August): 6:50, 7:20, 7:50, 8:10, 8:45, 9:15, 9:50, 10:10, 11:00, 11:20, 12:05, 12:45, 13:10, 14:00, 14:40, 15:00, 15:50, 16:30, 17:05, 17:30, 18:10, 18:50, 19:30. Return from Observatoire: 10:10, 11:00, 11:20, 12:05, 12:45, 13:10 14:00, 14:40, 15:00, 15:50, 16:30, 17:05, 17:30, 18:10, 18:50, 19:30 (better to show up 5 min early since bus may be early) ## TelephoneTo call an observatory telephone from outside, dial 04 92 00 ## ##, where ## ## is a four-digit extension inside the observatory. For local calls outside the observatory, dial 0 first, then the ten-digit French telephone number. For long-distance and foreign calls please ask a local participant who will give you a suitable code (somewhat confidential). Please note that you cannot call mobile phones from observatory fixed phones. ## Local networkThere are several Linux PCs and X terminals with guest accounts available for participants (details of their location and access procedures are better explained on the spot rather than in an abstract text like this). Should you like to connect your own laptop, please let us know in advance by dropping an email so that we arrange a static IP number for you. Once you have an IP, configure the TCP/IP access by indicating the IP 192.54.###.42 for the gateway and the IPs 192.54.###.60, 192.54.###.72 for the primary and secondary DNS (### must coincide with the corresponding part of your static IP, which may vary). |

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