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The First Galaxies in the Universe$
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Abraham Loeb and Steven R. Furlanetto

Print publication date: 2013

Print ISBN-13: 9780691144917

Published to Princeton Scholarship Online: October 2017

DOI: 10.23943/princeton/9780691144917.001.0001

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Nonlinear Structure and Halo Formation

Nonlinear Structure and Halo Formation

(p.41) Chapter Three Nonlinear Structure and Halo Formation
The First Galaxies in the Universe

Abraham Loeb

Steven R. Furlanetto

Princeton University Press

This chapter studies the evolution of perturbations in the nonlinear regime. It focuses for the most part on analytic models that shed light on the physical processes involved. The advent of computer technology has made numerical studies of nonlinear evolution almost routine, and many of today's theoretical calculations follow this path. The analytic approaches described here inform these calculations, but the numerical simulations help to sharpen this chapter's conclusions and predictions. The chapter discusses this synergy and describes “semianalytic” models that can be written analytically but whose ultimate justification lies in their good agreement with numerical simulations. It also describes the fundamental aspects of computational methods.

Keywords:   nonlinear structure, halo formation, perturbations, analytic models, nonlinear evolution, numerical simulations, semianalytic models, computational methods

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