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Distinguishability of scalar field models of dark energy with time variable equation of state parameter
cosmology dark energy–scalar field cosmic microwave background
2010/11/16
The possibility of distinguishing of scalar field models of dark energy with different Lagrangians and time variable equation of state parameter by available observational data is analyzed. The mul-ti...
The quasar PG 0844+349 in an X-ray weak state
The quasar PG 0844+349 in an X-ray weak state
2011/1/10
In March 2009 the well-studied quasar, PG 0844+349, was discovered with Swift to be in an X-ray weak state. A follow-up XMM-Newton observation several weeks later generated a good quality spectrum of ...
The State of Self-Organized Criticality of the Sun During the Last Three Solar Cycles. II. Theoretical Model
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/24
The observed powerlaw distributions of solar flare parameters can be interpreted in terms of a nonlinear dissipative system in the state of self-organized criticality (SOC).
Resistivity-driven State Changes in Vertically Stratified Accretion Disks
High Energy Astrophysical Phenomena (astro-ph.HE)
2010/12/22
We investigate the effect of shear viscosity and Ohmic resistivity on the magnetorotational instability (MRI) in vertically stratified accretion disks through a series of local simulations computed wi...