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Dynamics of gravitational clustering: V. Subleading corrections in the quasi-linear regime

Astronomy and Astrophysics, ISSN: 0004-6361, Vol: 382, Issue: 2, Page: 477-487
2002
  • 24
    Citations
  • 0
    Usage
  • 5
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    24
    • Citation Indexes
      24
  • Captures
    5

Article Description

We investigate the properties of the standard perturbative expansions which describe the early stages of the dynamics of gravitational clustering. We show that for hierarchical scenarios with no small-scale cutoff perturbation theory always breaks down beyond a finite order q. Furthermore, the degree of divergence increases with the order of the perturbative terms so that renormalization procedures cannot be applied. Nevertheless, we explain that despite the divergence of these subleading terms the results of perturbation theory are correct at leading order because they can be recovered through a steepest-descent method which does not use such perturbative expansions. Finally, we investigate the simpler cases of the Zel'dovich and Burgers dynamics. In particular, we show that the standard Burgers equation exhibits similar properties. This analogy suggests that the results of the standard perturbative expansions are valid up to the order q (i.e. until they are finite). Moreover, the first "non-regular" term of a largo-scale expansion of the two-point correlation function should be of the form Rσ(R). At higher orders the large-scale expansion should no longer be over powers of σ but over a different combination of powers of 1/R. However, its calculation requires new non-perturbative methods.

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