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pro vyhledávání: '"Jens C. Niemeyer"'
Following inflation, the Universe may pass through an early matter-dominated phase supported by the oscillating inflaton condensate. Initially small fluctuations in the condensate grow gravitationally on subhorizon scales and can collapse to form non
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::91bda32f426af222657613cadae6e664
Publikováno v:
Zaguán. Repositorio Digital de la Universidad de Zaragoza
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The Universe may pass through an effectively matter-dominated epoch between inflation and Big Bang Nucleosynthesis during which gravitationally bound structures can form on subhorizon scales. In particular, the inflaton field can collapse into inflat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d27ca4ef73df3da3f10937c330f13335
http://zaguan.unizar.es/record/112519
http://zaguan.unizar.es/record/112519
Autor:
Bodo Schwabe, Jens C. Niemeyer
Fuzzy dark matter (FDM) made of ultra-light bosonic particles is a viable alternative to cold dark matter (CDM) with clearly distinguishable small-scale features in collapsed structures. On large scales, it behaves gravitationally like CDM deviating
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::27b6a6f78514511a369db372870c88c0
http://arxiv.org/abs/2110.09145
http://arxiv.org/abs/2110.09145
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 482:4654-4672
In order to study the influence of turbulence on star formation, stellar feedback, and the mixing of metals into the circumgalactic medium (CGM), we implemented a model for star formation and stellar feedback and employ it in cosmological large eddy
This work studies the formation and growth of boson stars and their surrounding miniclusters by gravitational condensation using non-linear dynamical numerical methods. Fully dynamical attractive and repulsive self-interactions are also considered fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1c9f8c6a0fc8a030fd3ea1d3ccc19ee4
http://arxiv.org/abs/2011.01333
http://arxiv.org/abs/2011.01333
Publikováno v:
Physical Review D. 102
The distinctive effects of fuzzy dark matter are most visible at nonlinear galactic scales. We present the first simulations of mixed fuzzy and cold dark matter, obtained with an extended version of the nyx code. Fuzzy (or ultralight or axionlike) da
The early Universe may have passed through an extended period of matter-dominated expansion following inflation and prior to the onset of radiation domination. Sub-horizon density perturbations grow gravitationally during such an epoch, collapsing in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e05eb8e1e11dc05abfceea0b85963bd9
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 470:142-156
Major mergers are considered to be a significant source of turbulence in clusters. We performed a numerical simulation of a major merger event using nested-grid initial conditions, adaptive mesh refinement, radiative cooling of primordial gas, and a
Autor:
Jens C. Niemeyer, David J. E. Marsh
Publikováno v:
Physical review letters. 123(5)
The fuzzy dark matter (FDM) model treats DM as a bosonic field with astrophysically large de Broglie wavelength. A striking feature of this model is $\mathcal{O}(1)$ fluctuations in the dark matter density on time scales which are shorter than the gr
Autor:
Benedikt Eggemeier, Jens C. Niemeyer
We study the formation and the subsequent mass growth of axion stars inside axion miniclusters. Numerically solving the Schr\"odinger-Poisson equations with realistic initial conditions we find that the axion stars exhibit similar properties to solit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f7fb82758db0ecb04aefde4d55999154