Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994stin...9524455d&link_type=abstract
Presented at the 5th Astrophysics Conference, College Park, MD, 10-12 Oct. 1994
Astronomy and Astrophysics
Astrophysics
Computerized Simulation, Dark Matter, Galaxies, Many Body Problem, Halos, Line Of Sight, Particle Trajectories
Scientific paper
Peebles has suggested an interesting method to trace back in time positions of galaxies called the least action method. This method applied on the Local Group galaxies seems to indicate that we live in an (Omega)(approx) 0.1 Universe. We have studied a cold dark matter (CDM) N-body simulation with (Omega) = 0.2 and H = 50 kms-1/Mpc and compare trajectories traced back from the Least Action Principle and the center of mass of the particle forming CDM halos. We have shown that the agreement between these set of trajectories is at best qualitative. We have also shown that the line of sight peculiar velocities are underestimated. This discrepancy is due to orphans, CDM particles which do not end up in halos. By varying the density parameter (Omega) in the least action principle we show that using this method we would underestimate the density of the Universe by a factor of 4--5.
Dunn Andrew M.
Laflamme Raymond
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