April 2009 - Cosmo-torun - cosmo.torun.pl

some notes after today's talk - LDM
by Boud Roukema 22 May '09

22 May '09

witam cosmo-torun * circular polarisation from synchrotron processes? Kennett & Melrose, 1998, PASA, 15, 211 http://www.atnf.csiro.au/pasa/15_2/kennett/paper/node3.html > In some sources it may be that the relativistic > particles are electron-positron pairs (e.g., Wilson & > Weiler 1997). Electrons and positrons contribute with > the same sign to the linearly polarized component and > with the opposite sign to the circularly polarized > component. If the distributions of electrons and > positrons are the same the wave modes can have no > circular component and, more importantly, the intrinsic > circular polarization from the synchrotron radiation > sums to zero. So if we have different distributions of electrons and positrons, then we get a circular polarisation component. i'm sure there must be more basic texts on this subject... pozdr boud

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cosmo talk = ? Fri 10 april && DE as a continuity condition Fri 17 April
by Boud Roukema 17 Apr '09

17 Apr '09

hi cosmo-torun, i haven't seen an announcement for a talk tomorrow (Fri 10 April), will there be one? Anyway, i propose for 16.00 Fri 17 April: Dark Energy as a spatial continuity condition (arXiv:0904.0975) Moze byc? pozdr boud

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dark energy from continuity, finiteness and homogeneity (nothing exotic)
by Boud Roukema 07 Apr '09

07 Apr '09

witam wszystkim na cosmo-torun, If space is flat and compact, then dark energy does not require any exotic explanation, it's just a stretching effect required by the assumptions of homogeneity and continuity. http://arxiv.org/abs/0904.0975 Geometry rather than exotic particle physics or modifications of gravity. Enjoy. :) pozdr boud

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