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%TOC% ---- ---+ Research topics - different intensities at Licencjat/Magister/Doktorat level %STARTINCLUDE% ---++++ Topology of the Universe Detection * In http://de.arxiv.org/abs/astro-ph/0402608, it seems that we may have measured the shape of the Universe, since certain parts of the cosmic microwave background seen by the WMAP satellite appear to be seen twice in different directions on the sky, due to topological lensing. The purpose of the masters/licencjat project is: * Aim: Propose and apply a further test using WMAP data which further tests the hypothesis. This requires: * Reading/writing/managing the WAMP data file with free software computer programs * Statistical analysis * Independently checking that the computer code does the algebraic and statistical analyses correctly ---++++ Dark Matter Detection - DAMA/NaI + Foot et al. * In http://de.arxiv.org/abs/astro-ph/0405282 the 7 year results of the DAMA/NaI dark matter direct detection experiment show a signal significant at 6.3σ according to the authors. An explanation for why a signal from mirror-baryonic matter should be expected in this experiment but not in others with similar cross-section detection parameters is presented in AstroPh:0403043, see also AstroPh:0407623 and references therein. * Aim: Check the experimental and theoretical claims and propose further tests * Try to find an alternative explanation for the DAMA/NaI results without going beyond the Standard Model of particle physics * Check whether the Foot et al. calculations of mirror matter properties are consistent with all the experimental data as the authors claim * Extend the Foot et al. calculations to find, e.g. a non-gravitational effect of mirror matter in stellar physics, e.g. symbiotic stars (gravitational effects of dark matter are already well studied) * More info: http://adjani.astro.uni.torun.pl/cgi-bin/twiki/view/Cosmo/NonBaryonicDarkMatter#the_DAMA_NaI_detection_and_mirro ---++++ Dark Matter - Light Dark Matter (LDM) hypothesis - Galaxy Centre INTEGRAL results * http://arxiv.org/abs/astro-ph/0507142 * Is the 511 keV line emission in the galactic centre due to annihilating LDM? ---++++ Cosmic String Detection * In http://de.arxiv.org/abs/astro-ph/0410073 Kibble discusses the <del><strike> http://de.arxiv.org/abs/astro-ph/302547 possible detection of a cosmic string which seems to gravitationally lens a background galaxy (Sazhin et al.) In http://de.arxiv.org/abs/astro-ph/0406516 the extra pairs of lensed galaxies predicted by the hypothesis are discussed.</del></strike> - see AstroPh:0601494 Sazhin et al. * Also Schild et al 2004 - AstroPh:0406434 * Aim: Understand the basics about (1) cosmic strings, (2) gravitational lensing versus cosmic string lensing, and test the hypothesis * Calculate the probability of seeing the original pair by chance * Check whether the statistics of expected numbers of lensed images are correct * Propose an independent test of the hypothesis, e.g. using radio observations and prepare an observing proposal * compare with conventional gravitational lensing interpretations * introductions to grav lensing: AstroPh:9606001 - AstroPh:0012423 - AstroPh:0108255 * Schild et al. foreground galaxy as lensing object - AstroPh:0504396 * recent MACHO articles: http://arxiv.org/find/astro-ph/1/ti:+machos/0/1/0/all/0/1 * MACHO debate: are the MW microlensing events only due to known stellar populations? Evans & Belokurov, 2004, _RIP: The Macho Era (1974-2004)_ AstroPh:0411222 vs Griest & Thomas 2004 _Contamination in the MACHO dataset and the puzzle of LMC Microlensing_ AstroPh:0412443 * Nice pictures :) - [[http://antwrp.gsfc.nasa.gov/apod/image/0110/a2218c_hst_big.jpg][Abell 2218]] %STOPINCLUDE%
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Topic revision: r5 - 03 Feb 2006,
BoudRoukema
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