NDLI: Path integral approach for merger rates of dark matter haloes

Content Provider	Springer Nature Link
Author	Hiotelis, N.
Copyright Year	2012
Abstract	We use path integrals in order to estimate merger rates of dark matter haloes using the Extended Press-Schechter approximation (EPS) for the Spherical Collapse (SC) and the Ellipsoidal Collapse (EC) models.Merger rates have been calculated for masses in the range 1010 M ⊙/h to 1014 M ⊙/h and for redshifts z in the range 0 to 3. A detailed comparison between these models is presented. Path approach gives a better agreement with the exact solutions for constrained distributions than the approach of Sheth and Tormen (Mon. Not. R. Astron. Soc. 329:61, 2002). Although this improvement seems not to be very large, our results show that the path approach is a step to the right direction. Differences between the two widely used barriers, spherical and ellipsoidal, depend crucially on the mass of the descendant halo. These differences become larger for decreasing mass of the descendant halo. The use of additional terms in the expansion used in the path approach, other improvements as well as detailed comparisons with the predictions of N-body simulations, that could improve our understanding about the important issue of structure formation, are under study.
Starting Page	475
Ending Page	485
Page Count	11
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	342
Issue Number	2
e-ISSN	1572946X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-07-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Galaxies: halos-formation Methods: analytical Cosmology: large structure of Universe Cosmology Astrophysics and Astroparticles Astronomy, Observations and Techniques Extraterrestrial Physics, Space Sciences Astrobiology
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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