publication (ArXiv + formal publication) of the "alphabet", introduction to inhomogeneous cosmology helps in community growth
European Commission, NCN, ANR, ... open access initiative 2020 - CC-BY licence
Do we want a highly pedagogical guide to inhomogeneous cosmology (doctoral/master student level)?
Plebanski & Krasinski; some of the Ellis, Maartens, MacCallum;
whitepaper extra science questions
what is the physics behind the various codes (ET, gevolution, ...) available?
initial condition hypersurfaces, what mathematical/physical framework? framework = set of libraries and functions
Sage can be slow for calculating Riemann tensor and other symbolic calculus so on because of python layers?
developing the C (or equivalent) level codes/libraries should be a high priority
what assumptions are made by the codes? which ones are motivated by numerical reasons and unphysical? * which numerical effects mix up various physical effects? * interpretation problem of numerical simulations?
foliation-dependence of scalar averaging? is it physical?
multi-fluids - can Roberto's methods be applied?
for computational purposes multifluid can be modelled as a "horrible" single fluid (requires assumptions of interactions between fluids)?
how do the equations-of-state (highly abused term; it's thermodynamical, based on macroscopical statistics of particles, in cosmology we're not really justified in using this terminology?) relate to one another?
LCDM "tensions" could (should?) be a priority for us
postdictions - useful challenge for inhomogeneous cosmology
update Buchert Roukema Ostrowski Kleinert - prioritise LCDM view on "most important tensions"
H_0 tension; lack of power l < 20 in CMB; CMB anomalies (cold spot)? Lyman alpha foest BAO estimates; power at high vs low length (or mass) scales
crossovers with quantum physics? maybe via black hole calculations?
search for crossovers, can we learn from other fields? geometric (geometry+topology) n+1 spacetimes, particle descriptions