Thu 17 Sep 2009

Nemanja KALOPER - inflaton etc

• inflaton difficult but not impossible to obtain
• T^4, topological mass term ...

Arman SHAFIELOO - Is cosmic acceleration slowing down?

• 90 new low z < 0.08 SNe Ia data from CfA
• OM fittings, SN+BAO vs SN+BAO+WMAP gives
• ArXiv:0903.5141
• OM behaviour at low z
  • can be derived directly from H rather than dot(H)
  • errors in OM smaller than for EOS
  • OM not sensitive to Omega_m
  • CPL parametrisation strains to fit low z and high z data simultaneously

Masahiro MORIKAWA - Bose-Einstein condensate DE/DM (BEC)

• AstroPh:0403571
• boson field
• What is the boson? axion? neutrino pair condensation? new physics?
• if m = 1 eV, then BEC collapses to form objects of size l* approx 30(m/1eV)^2 kpc
  • if BEC decays at z = 20, this gives about 20 kpc
• predicts stagflation which dissipatively reduces Lambda to zero

Mikhail KATANAEV - geometric theory of defects

• edge dislocation - in elastic media - Burger's vector
• disclinations - in spin structures
• geometric model vs elasticity model

Marek SZYDLOWSKI - whirlpool scenario

• flat model
• ArXiv:0906.0335
• 3D phase space trajectory matches different evolution stages of Universe, i.e. radiation, dust and accelerating epochs

Ivan DEBONO - weak lensing forecasts for DE, neutrinos and initial conditions

• modelling of local cosmological parameters
• lensing can be useful
• need to: minimise "systematics in lensing", more accurate theoretical power spectrum calculation, combining different experiments is always better

Stefano CAMERA (Turino) - weak lensing in unified DM/DE models

• ArXiv:0902.4204
• would have some effect on weak lensing via a high l effect

Boud ROUKEMA - Some spaces are more equal than others

• AstroPh:0602159 + ArXiv:0902.3402 (summary: ArXiv:0905.2543)