The Topology of Cosmological Reionization

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dc.creatorLee, Khee-Gan
dc.creatorCen, Renyue
dc.creatorGott III, J. Richard
dc.creatorTrac, Hy
dc.date2007-08-20
dc.date2007-11-07
dc.date.accessioned2026-07-07T12:47:22Z
dc.date.available2026-07-07T12:47:22Z
dc.descriptionUsing the largest cosmological reionization simulation to-date (~24 billion particles), we use the genus curve to quantify the topology of neutral hydrogen distribution on scales > 1 Mpc as it evolves during cosmological reionization. We find that the reionization process proceeds primarily in an inside-out fashion, where higher density regions become ionized earlier than lower density regions. There are four distinct topological phases: (1) Pre-reionization at z ~ 15, when the genus curve is consistent with a Gaussian density distribution. (2) Pre-overlap at 10 < z < 15, during which the number of HII bubbles increases gradually with time, until percolation of HII bubbles starts to take effect, characterized by a very flat genus curve at high volume fractions. (3) Overlap at 8 < z < 10, when large HII bubbles rapidly merge, manifested by a precipitous drop in the amplitude of the genus curve. (4) Post-overlap at 6 < z < 8, when HII bubbles have mostly overlapped and the genus curve is consistent with a diminishing number of isolated neutral islands. After the end of reionization (z < 6), the genus of neutral hydrogen is consistent with Gaussian random phase, in agreement with observations.
dc.description9 pages, 6 figures, accepted by ApJ
dc.identifierhttps://arxiv.org/abs/0708.2431
dc.identifierhttp://arxiv.org/abs/0708.2431
dc.identifier2008ApJ...675....8L
dc.identifierdoi:10.1086/525520
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/221696
dc.subjectAstrophysics
dc.titleThe Topology of Cosmological Reionization
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