Home      Discussions      About
Join us

@astro.uio.no

Jun 12, 2013

Are giant tornadoes the legs of solar prominences?

Observations in the 171 AA channel of the Atmospheric Imaging Assembly of the space-borne Solar Dynamics Observatory show tornadoes-like features in …
Mar 01, 2013

Systematic simulations of modified gravity: chameleon models

In this work we systematically study the linear and nonlinear structure formation in chameleon theories of modified gravity, using a generic paramete…
Sep 16, 2011

Inflation with stable anisotropic hair: is it cosmologically viable?

Recently an inflationary model with a vector field coupled to the inflaton was proposed and the phenomenology studied for the Bianchi type I spacetim…
Aug 20, 2015

What do iris observations of Mg II k tell us about the solar plage …

We analyze observations from the Interface Region Imaging Spectrograph of the Mg II k line, the Mg II UV subordinate lines, and the O I 135.6 nm line…
Jul 16, 2010
By 5D

Radiative transfer with scattering for domain-decomposed 3D MHD sim…

We present the implementation of a radiative transfer solver with coherent scattering in the new BIFROST code for radiative magneto-hydrodynamical (M…
Apr 01, 2016
By ada

Emergence of granular-sized magnetic bubbles through the solar atmo…

We study the ascent of granular-sized magnetic bubbles from the solar photosphere through the chromosphere into the transition region and above, for …
May 28, 2015
By tomik

Scalar-Fluid theories: cosmological perturbations and large-scale s…

Recently a new Lagrangian framework was introduced to describe interactions between scalar fields and relativistic perfect fluids. This allows two co…
Sep 04, 2012

Accelerated expansion from ghost-free bigravity: a statistical analys…

We study the background cosmology of the ghost-free, bimetric theory of gravity. We perform an extensive statistical analysis of the model using both…
Dec 16, 2011

The Cosmological Supersymmetron

Recently, a supersymmetric model of dark energy coupled to cold dark matter, the supersymmetron, has been proposed. In the absence of cold dark matte…
Dec 11, 2009
By jorritl

The quiet solar atmosphere observed and simulated in NaD1

The NaD1 line in the solar spectrum is sometimes attributed to the solar chromosphere. We study its formation in quiet-Sun network and internetwork. …
Jun 16, 2012

Systematic simulations of modified gravity: symmetron and dilaton mod…

We study the linear and nonlinear structure formation in the dilaton and symmetron models of modified gravity using a generic parameterisation which …
Aug 11, 2014

Inclinations of small quiet-Sun magnetic features based on a new ge…

High levels of horizontal magnetic flux have been reported in the quiet-Sun internetwork, often based on Stokes profile inversions. Here we introduce…
Sep 10, 2016
By maxbg

Estimates of cluster masses in screened modified gravity

We use cosmological hydrodynamical simulations to study the effect of screened modified gravity models on the mass estimates of galaxy clusters. In p…
May 21, 2018

Tale of stable interacting dark energy, observational signatures, and…

We investigate the observational consequences of a novel class of stable interacting dark energy (IDE) models, featuring interactions between dark ma…
Oct 11, 2016

Slender Ca II H Fibrils Mapping Magnetic Fields in the Low Solar Ch…

A dense forest of slender bright fibrils near a small solar active region is seen in high-quality narrowband Ca II H images from the SuFI instrument …
Feb 12, 2015

ALMA's high-cadence imaging capabilities for solar observations

The Atacama Large Millimeter/submillimeter Array offers an unprecedented view of our Sun at sub-/millimeter wavelengths. The high spatial, temporal, …
Mar 20, 2019
By eduardk
Plasma Physics
Space Physics

Nonlinear development of electron-beam-driven weak turbulence in an …

The self-consistent description of Langmuir wave and ion-sound wave turbulence in the presence of an electron beam is presented for inhomogeneous non…
Jun 24, 2019

Cosmology in $f(Q)$ geometry

The universal character of the gravitational interaction provided by the equivalence principle motivates a geometrical description of gravity. The st…
Mar 10, 2016

Extrasolar planets as a probe of modified gravity

We propose a new method to test modified gravity theories, taking advantage of the available data on extrasolar planets. We computed the deviations f…
Jul 20, 2016

Primordial Black Holes as Dark Matter

The possibility that the dark matter comprises primordial black holes (PBHs) is considered, with particular emphasis on the currently allowed mass wi…
There aren't more papers

Request Comment

or Invite via email
You are asking your first question!
How to quickly get a good answer:
  • Keep your question short and to the point
  • Check for grammar or spelling errors.
  • Phrase it like a question
Test
Test description