Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Hotchkiss, Shaun"'
Random, multifield functions can set generic expectations for landscape-style cosmologies. We consider the inflationary implications of a landscape defined by a Gaussian random function, which is perhaps the simplest such scenario. Many key propertie
Externí odkaz:
http://arxiv.org/abs/2107.09870
Landscape cosmology posits the existence of a convoluted, multidimensional, scalar potential -- the "landscape" -- with vast numbers of metastable minima. Random matrices and random functions in many dimensions provide toy models of the landscape, al
Externí odkaz:
http://arxiv.org/abs/2004.04429
Publikováno v:
Phys. Rev. Lett. 124, 061301 (2020)
In simple inflationary cosmological scenarios the near-exponential growth can be followed by a long period in which the Universe is dominated by the oscillating inflaton condensate. The condensate is initially almost homogeneous, but perturbations gr
Externí odkaz:
http://arxiv.org/abs/1909.11678
Publikováno v:
Phys. Rev. D 100, 023506 (2019)
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:
http://arxiv.org/abs/1901.08528
PyUltraLight simulates the dynamics of ultralight dark matter in a non-expanding background. PyUltraLight can describe the evolution of several interacting ultralight dark matter halos or one or more halos orbiting a central, fixed Newtonian potentia
Externí odkaz:
http://arxiv.org/abs/1807.04037
Publikováno v:
Phys. Rev. D 96, 123519 (2017)
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:
http://arxiv.org/abs/1710.02055
Publikováno v:
JCAP11(2017)039
The use of Eulerian 'standard perturbation theory' to describe mass assembly in the early universe has traditionally been limited to modes with k $\lesssim$ 0.1 h/Mpc at z = 0. At larger k the SPT power spectrum deviates from measurements made using
Externí odkaz:
http://arxiv.org/abs/1704.05309
Publikováno v:
Mon Not R Astron Soc (2017) 467 (4): 4067-4079
The properties of large underdensities in the distribution of galaxies in the Universe, known as cosmic voids, are potentially sensitive probes of fundamental physics. We use data from the MultiDark suite of N-body simulations and multiple halo occup
Externí odkaz:
http://arxiv.org/abs/1610.08382
Publikováno v:
Phys. Rev. D 93, 023526 (2016)
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:
http://arxiv.org/abs/1509.01163