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Research topics - different intensities at Licencjat/Magister/Doktorat level

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 http://de.arxiv.org/abs/0403043.
  • 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

Cosmic String Detection

  • In http://de.arxiv.org/abs/astro-ph/0410073 Kibble discusses the 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.
  • 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

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Topic revision: r2 - 22 Aug 2005, BoudRoukema
 
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