Modeling Dynamical Dark Energy

Details Modeling Dynamical Dark Energy Modeling Dynamical Dark Energy

2003-03-13

arxiv.org/abs/astro-ph/0303303v1

Astrophys.J. 599 (2003) 24-30

Astronomy and Astrophysics

Astrophysics

10 pages, 10 figures ApJ submitted

Scientific paper

10.1086/379236

Cosmological models with different types of Dark Energy are becoming viable alternatives for standard models with the cosmological constant. Yet, such models are more difficult to analyze and to simulate. We present analytical approximations and discuss ways of making simulations for two families of models, which cover a wide range of possibilities and include models with both slow and fast changing ratio w=p\rho. More specifically, we give analytical expressions for the evolution of the matter density parameter Omega_m(z) and the virial density contrast Delta_c at any redshift z. The latter is used to identify halos and to find their virial masses. We also provide an approximation for the linear growth factor of linear fluctuations between redshift z=40 and z=0. This is needed to set the normalization of the spectrum of fluctuations. Finally, we discuss the expected behavior of the halo mass function and its time evolution.

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