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<< Cosmo.WebHome %TOC% ---- %INCLUDE{"GrassmannCosmoFun2009Head"}% ---+ Tues 15 Sep 2009 * KOWALSKI - some recent SNe Ia results * John BARROW - varying alpha results: * Chand, Srianand et al. 2004 results wrong because started from assuming alpha = constant (instead of free parameter) and then seeing if it can be varied; and because their best fit chi^2 is not a nice parabola and they missed fitting many lines; someone has reanalysed the data and got back to the varying alpha result; * varying alpha for various absorption lines (Fe II(?), ...) * results from 3 groups agree dalpha/alpha \approx -0.6 \times 10^{-5} * varying alpha model BSBM - scalar field model - interpret Webb et al. results * BSBM => violation of weak equivalence principle * %$\Rightarrow (a-A)/(a+A) \sim 10^{-13} $% * present bounds = 10^{-12} - probably need to go to space to get stronger constraints, e.g. 10^{-18} * ... bouncing BSBM models.... * Pouria PEDRAM * Wheeler de Witt equation * Piotr DZIERZAK * Bianchi I type model and LQC * T^3 model !!! * ... Big Bounce at classical level * algebra of observables: * aim: singularity aspects of the model in terms of observables * E. MELAS * canonical QQ for geometries admitting maximally symmetric 2D surfaces * final expression for WDW eqn * Conclusion: * TODO: * (1) render finite the 3 smooth functionals y^1, y^2, y^3 * (2) select an appropriate inner product * requires only first derivatives, cf. Cartan-Karlhede which requires up to the 7th derivatives * Mariusz DABROWSKI * Big Rip, SFS (Sudden Future Singularity), TLB, radially inhomogeneous pressure models, possible solutions to DE with sudden singularity (in future(?)) * Przemyslaw MALKIEWICZ * see papers with Piechocki - strings, membranes, in time-dependent orbifold * Ghodsi HODA * working with Martin Hendry * q = fn(z), differs for SFS model vs standard concordance model * with m=constant, SFS fails to fit all fashionable data sets simultaneously * Boguslaw BRODA (Lodz) * DE from quantum flucutations * ... get rho approx rho_experimental where rho_experimental = rho_Lambda (?) * other interesting approaches: holographic DE e.g. Ricci DE which is similar to Broda's approach * Volovik approach - about 10 papers on arXiv.org -- Main.BoudRoukema - 15 Sep 2009
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Topic revision: r1 - 15 Sep 2009,
BoudRoukema
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