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(17 Sep 2018,
BoudRoukema
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<< Cosmo.InhomCosmIII %TOC% ---- ---+ Inhomogeneous cosmology research plans * _Notes from Monday 16 Sep and Friday 20 Sep discussions..._ * something lke an alphabet, literature guide, for new people to the field - whitepaper * 2011 CQG focus papers (CQG = Classical & Quantum Gravity) * 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 * Julius, Thomas, Leo, Jan, Pierre, Colin, Martin, Roberto, Hayley, Justyna, Andrzej K, Michele -- Main.BoudRoukema - 13 Sep 2018 + ...
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Topic revision: r2 - 17 Sep 2018,
BoudRoukema
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