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Why is the Zel'dovich Approximation so Accurate?
A. Yoshisato, M. Morikawa, N. Gouda +1
Why does the Zel'dovich approximation (ZA) work well to describe gravitational collapse in the universe? This problem is examined by focusing on its dependence on the dimensionalit…
Negative skewness of radial pairwise velocity in the quasi-nonlinear regime: Zel'dovich approximation
A. Yoshisato, M. Morikawa, H. Mouri
According to N-body numerical simulations, the radial pairwise velocities of galaxies have negative skewness in the quasi-nonlinear regime. To understand its origin, we calculate t…
Beyond Zel'dovich-Type Approximations in Gravitational Instability Theory --- Padé Prescription in Spheroidal Collapse ---
Takahiko Matsubara, Ayako Yoshisato, Masahiro Morikawa
Among several analytic approximations for the growth of density fluctuations in the expanding Universe, Zel'dovich approximation in Lagrangian coordinate scheme is known to be unus…
Accuracy of Nonlinear Approximations in Spheroidal Collapse --- Why are Zel'dovich-type approximations so good? ---
Ayako Yoshisato, Takahiko Matsubara, Masahiro Morikawa
Among various analytic approximations for the growth of density fluctuations in the expanding Universe, Zel'dovich approximation and its extensions in Lagrangian scheme are known t…