.. _sphx_glr_api_gallery_astro_cosmic_web:

Cosmic-web formation
----------------------

The Zel'dovich (1970) approximation: how an initially uniform grid of
matter collapses into the filaments, sheets, and nodes of the cosmic web.


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  <div id='sg-tag-list' class='sphx-glr-tag-list'></div>


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    <div class="sphx-glr-thumbcontainer" tooltip="Zel&#x27;dovich (1970, &quot;Gravitational instability: An approximate theory for large density perturbations&quot;) showed that, to leading order, a fluid element of dark matter simply free-streams away from its initial (&quot;Lagrangian&quot;) position \mathbf{q} in a fixed direction set by the gradient of a displacement potential \Phi(\mathbf{q}):">

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  .. image:: /api/gallery/astro/cosmic_web/images/thumb/sphx_glr_plot_zeldovich_pancakes_thumb.png
    :alt:

  :doc:`/api/gallery/astro/cosmic_web/plot_zeldovich_pancakes`

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      <div class="sphx-glr-thumbnail-title">Cosmic-web formation: the Zel'dovich approximation</div>
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    </div>


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   :hidden:

   /api/gallery/astro/cosmic_web/plot_zeldovich_pancakes