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8 papers · 1 filter
An Accurate Analytic Model for the Thermal Sunyaev-Zel'dovich One-Point PDF
Leander Thiele, J. Colin Hill, Kendrick M. Smith
Non-Gaussian statistics of late-time cosmological fields contain information beyond that captured in the power spectrum. Here we focus on one such example: the one-point probabilit…
Anderson localization for two interacting quasiperiodic particles
Jean Bourgain, Ilya Kachkovskiy
We consider a system of two discrete quasiperiodic 1D particles as an operator on and establish Anderson localization at large disorder, assuming the potentia…
Instabilities in disc galaxies: from noise to grooves to spirals
Sven De Rijcke, Jean-Baptiste Fouvry, Christophe Pichon
Using the linearized Boltzmann equation, we investigate how grooves carved in the phase space of a half-mass Mestel disc can trigger the vigorous growth of two-armed spiral eigenmo…
How gravitational softening affects galaxy stability I. Linear mode analysis of disc galaxies
Sven De Rijcke, Jean-Baptiste Fouvry, Walter Dehnen
Linear perturbation is used to investigate the effect of gravitational softening on the retrieved two-armed spiral eigenmodes of razor-thin stellar discs. We explore four softening…
New Inflation in the Landscape and Typicality of the Observed Cosmic Perturbation
Chien-I Chiang, Keisuke Harigaya
We investigate if the observed small and nearly scale-invariant primordial cosmic perturbation, i.e. the perturbation amplitude and the spectral index $n_s \simeq…
Extended stellar systems in the solar neighborhood - I. The tidal tails of the Hyades
Stefan Meingast, João Alves
We report the discovery of two well-defined tidal tails emerging from the Hyades star cluster. The tails were detected in Gaia DR2 data by selecting cluster members in the three-di…