Euclid theory working group ~ Marseille presentation
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1 Euclid theory working group ~ Marseille presentation Task of theory WG: provide vision for the future direction of mission forecast which will be the main questions in 5+ years, set up framework to answer those questions help with calculations, optimisation and forecasts (additional beyond-standard parameters) motivate/inform/support numerical simulation effort Investigate advanced statistical tools Propose additional science
2 over 100 members Theory SWG Coordinators: Luca Amendola and Martin Kunz, deputy Matteo Viel Wiki on Redmine euclid.roe.ac.uk mailing list: telecon: Teamspeak Mondays at 5pm CET see wiki front-page for details work packages have separate telecons next meeting: January 2015 in Oslo (plus param def doc working meeting this summer)
3 Logical TH-SWG structure science WP s DE+MG DM initial cond s background Review document (explanations) GC WL IST IST horizon scanning WP (new probes + synergies) applied WP s statistics + forecasts non-linear scales relativistic effects probe combination param def doc (definitions + fiducial model) cosmo-sim rest of EC
4 Review document TH-SWG status arxiv: (60 authors, 200+ pages) published: Living Rev. Relativity 6 (2013), 6 bi-annual new releases, new cycle under way editor in chief: Valeria Pettorino Parameter definition document defines cosmological parameters in model context, including fiducial values links to review doc, forecast & sim docs Work packages key entities for TH-SWG work links to IST s & other SWG s, update review doc
5 List of WP s 1+2: Dark energy & testing gravity (Ferreira, Bean) 3: Dark Matter and Particle Cosmology (Kitching, Camera) 4: Initial conditions (inflation, non-gaussianity etc) (Desjacques, Germani) 5: Deviations from homogeneity and isotropy (Garcia- Bellido, Marra) [statistical methods and forecast support (Pettorino)] 7: analytical approaches to non-linearities (incl. baryon physics) (Mota, Christopherson) 8: combining different probes (Blanchard, Carbone) à IST 9: Relativistic effects in observations (Bonvin) 10: New observational probes (Martins) à shared GC/WL 11: Review document (Pettorino, Baker, Camera, Majerotto, Vollmer) 12: Parameter definitions document
6 a bit of science J Origin of acceleration: Cosmological constant or vacuum energy? Simple scalar field Quintessence? Modified gravity? Non-linear effect?
7 a bit of science J key questions: how do we test GR with Euclid? how can we distinguish dark energy from a modification of General Relativity? and many more! nature of dark matter, neutrino masses, isotropy and homogeneity of the universe, initial conditions / inflation, varying constants,
8 A machine to test general relativity Psaltis 2013
9 A machine to test general relativity An example: Jordan-Brans-Dicke Theory (a time varying Newton constant) Now: Solar System (Cassini) Avilez & Skordis arxiv: Comparable but on length scales time greater! Euclid: (RSDs only ) Baker, Ferreira & Skordis, arxiv:
10 dark energy vs modif. of GR if Euclid sees a deviation from the standard model, how will we know whether it is dark energy or a modification of General Relativity? GR-like theories have two gravitational potentials, ϕ and ψ in GR ϕ = ψ (with very small corrections) ϕ ψ indicates either time-varying Newton constant or gravitational wave speed speed of light weak lensing measures ϕ+ψ redshift-space distortions measure ψ Theory Euclid Amendola, Kunz, Motta, Saltas, Sawicki, arxiv: , ,
11 Euclid is a fundamental physics experiment! Euclid is not only a cosmology and astrophysics mission, it can test fundamental physics on length-scales only accessible in this way But of course Euclid will also revolutionize cosmology and astrophysics Details soon in a new revision of the theory review document
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