This 3 days workshop aims at gathering string theorists and cosmologists to discuss recent developments on the timely topics of:
- today's accelerated expansion and dark energy (cosmological constant, quintessence)
- Hubble tension and early dark energy models
- inflation (single and multifield)
considering both observational constraints (including DES, DESI results, prospects from Euclid, LSST, and CMB observations) as well as theoretical constraints (cosmological model building, string theory realisations and swampland obstructions). Ample time will be given for discussions between the participants and members of the two communities. Recent related events include the String - Cosmo Day and the AES3L workshop. This workshop takes part in the Transverse Task Force activities of the GdR CoPhy.
The workshop will take place in the Auditorium of LAPTh in Annecy, France, from the 10th till the 12th December 2025.
Registration and program: more information later.
Lunches, coffee and workshop dinner: those will be provided to the participants.
Accommodation: more information later.
Travel information: nearby airports are in Geneva and Lyon. Annecy can also be reached by train (SNCF) or by bus (see below).
From Geneva airport as well as Geneva Cornavin train station, you can reach Annecy by train or by bus (272). It takes between 1:30 to 2 hours, and booking for both can be done on the Swiss train website. A faster option (45 mins), although traffic and border dependent, is by car. A last option is Flixbus.
From Lyon airport, you would have to take a fast tram to Lyon La Part Dieu train station. From there, you can take a train to Annecy (between 1:30 to 2 hours). Other options from Lyon are by car (1:30 hour) or again Flixbus.
Once at Annecy train and bus station, LAPTh can easily be reached by bus (e.g. with line 1) following these instructions. It takes about 20 mins, and tickets can be bought with cash at the bus driver. SIBRA is the public transport website.
More travel information can also be found here. Travel expenses remain to be covered by participants.
Social activities: Annecy, with its lake and old city, deserves to be explored. At this time of the year, we also recommend the Christmas markets. In addition, the mountain surroundings offer ski resorts, sometimes reachable by public transport.
Organisers: David Andriot, Vivian Poulin, Sébastien Renaux-Petel, Gary Shiu
