Výsledky vyhledávání - "Mateja Gosenca"

Akademický článek

Dynamical Analysis of Scalar Field Cosmologies with Spatial Curvature

Autor: Mateja Gosenca, Peter Coles

Publikováno v: The Open Journal of Astrophysics, Vol 1 (2016)

We explore the dynamical behaviour of cosmological models involving a scalar field (with an exponential potential and a canonical kinetic term) and a matter fluid with spatial curvature included in the equations of motion. Using appropriately defined

Externí odkaz: https://doaj.org/article/2f3aa5d1f2ca4ac8bf2c394f95e32a17

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Multifield Ultralight Dark Matter

Autor: Mateja Gosenca, Andrew Eberhardt, Yourong Wang, Benedikt Eggemeier, Emily Kendall, J. Luna Zagorac, Richard Easther

Publikováno v: INSPIRE-HEP

Ultralight dark matter (ULDM) is usually taken to be a single scalar field. Here we explore the possibility that ULDM consists of $N$ light scalar fields with only gravitational interactions. This configuration is more consistent with the underlying

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eceb72d4573d75618c7634edbb7473d9
http://arxiv.org/abs/2301.07114

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Simulating mixed fuzzy and cold dark matter

Autor: Richard Easther, Bodo Schwabe, Mateja Gosenca, Christoph Behrens, Jens C. Niemeyer

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

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d7c2b826093047f85cbebee9cc9aaa2c
https://doi.org/10.1103/physrevd.102.083518

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WIMPs and stellar-mass primordial black holes are incompatible

Autor: Shaun Hotchkiss, Julian Adamek, Mateja Gosenca, Christian T. Byrnes

Publikováno v: Physical Review D. 100

We recently showed that postulated ultracompact minihalos with a steep density profile do not form in realistic simulations with enhanced initial perturbations. In this paper we assume that a small fraction of the dark matter consists of primordial b

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c466aa16f4a6fb653798f75ccb4ed0e
https://doi.org/10.1103/physrevd.100.023506

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Semiclassical path to cosmic large-scale structure

Autor: Oliver Hahn, Mateja Gosenca, Cornelius Rampf, Cora Uhlemann

Publikováno v: Phys.Rev.D
Phys.Rev.D, 2019, 99 (8), pp.083524. ⟨10.1103/PhysRevD.99.083524⟩
Physical Review D
Physical Review D, American Physical Society, 2019, 99 (8), pp.083524. ⟨10.1103/PhysRevD.99.083524⟩

We chart a path toward solving for the nonlinear gravitational dynamics of cold dark matter by relying on a semiclassical description using the propagator. The evolution of the propagator is given by a Schr\"odinger equation, where the small paramete

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9fe72ba12b211d73151bc5cf40075034
http://arxiv.org/abs/1812.05633

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3D simulations with boosted primordial power spectra and ultracompact minihalos

Autor: Julian Adamek, Christian T. Byrnes, Shaun Hotchkiss, Mateja Gosenca

Publikováno v: Phys.Rev.D
Phys.Rev.D, 2017, 96 (12), pp.123519. ⟨10.1103/PhysRevD.96.123519⟩
Physical Review D
Physical Review D, American Physical Society, 2017, 96 (12), pp.123519. ⟨10.1103/PhysRevD.96.123519⟩
Phys.Rev.D, 2017, 96 (12), pp.123519. 〈10.1103/PhysRevD.96.123519〉

We perform three-dimensional simulations of structure formation in the early Universe, when boosting the primordial power spectrum on approximately kpc scales. We demonstrate that our simulations are capable of producing power-law profiles close to t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8093d46d6f295b2bec1f117f07b08214
https://hal.archives-ouvertes.fr/hal-01703589

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Dynamical Analysis of Scalar Field Cosmologies with Spatial Curvature

Autor: Peter Coles, Mateja Gosenca

Publikováno v: The Open Journal of Astrophysics, Vol 1 (2016)
The Open Journal of Astrophysics

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::39be99efe6c9841d91b41cc9a4af4d52

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Spherically Symmetric N-body Simulations with General Relativistic Dynamics

Autor: Mateja Gosenca, Shaun Hotchkiss, Julian Adamek

Within a cosmological context, we study the behaviour of collisionless particles in the weak field approximation to General Relativity, allowing for large gradients of the fields and relativistic velocities for the particles. We consider a sphericall

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::faf610eedfde933ac4dd021d2655edd1

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Constraining the WMAP9 bispectrum and trispectrum with needlets

Autor: David Seery, Mateja Gosenca, Donough Regan

Publikováno v: Journal of Cosmology and Astroparticle Physics. 2015:013-013

We develop a needlet approach to estimate the amplitude of general (including non-separable) bispectra and trispectra in the cosmic microwave background, and apply this to the WMAP 9-year data. We obtain estimates for the `orthogonal' bispectrum mode

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::19cf14845700668df7da9e28eb406a0a
https://doi.org/10.1088/1475-7516/2015/01/013

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