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The multi-stream flows and the dynamics of the cosmic web
cosmic web cosmological simulations cosmic flows
2010/11/12
A new numerical technique to identify the cosmic web is proposed. It is based on locating multi-stream flows, i.e. the places where the velocity field is multi-valued. The method is local in Eulerian ...
Examining the cosmic acceleration with the latest Union2 supernova data
cosmic acceleration latest Union2 supernova data
2010/12/20
In this Letter, by reconstructing the Om diagnostic and the deceleration parameter q from
the latest Union2 Type Ia supernova sample with and without the systematic error along with
the baryon acous...
Detectability of ultrahigh energy cosmic ray signatures in gamma rays
gamma ray emission ultrahigh energy cosmic rays extragalactic magnetic fields propagation
2010/11/10
The injection of ultra-high energy cosmic rays in the intergalactic medium leads to the production of a GeV-TeV gamma-ray halo centered on the source location, through the production of a high electro...
The arrival directions of ultrahigh energy extensive air showers (EAS) by Yakutsk, AGASA and P. Auger data are considered. It is found that the arrival directions of EAS in the Yakutsk and AGASA data ...
We present the main results on the energy spectrum and compo-sition of the highest energy cosmic rays of energy exceeding 1018 eV obtained by the High Resolution Fly’s Eye and the Southern Auger Ob-se...
Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
Unified cosmic history theory Lorentz non-invariant models
2010/11/16
Classical generalization of general relativity is considered as gravitational alternative for unified description of the early-time inflation with late-time cosmic acceleration. The structure and cosm...
Cosmic Sum Rules
Cosmic Sum Rules
2010/12/21
The data recently collected by PAMELA [1] indicate that there is a positron excess in the cosmic ray (CR) en-ergy spectrum above 10 GeV which was already observedin 1974. Such a rising behavior does n...
Dark energy, non-minimal couplings and the origin of cosmic magnetic fields
Dark energy non-minimal couplings the origin of cosmic magnetic fields
2011/1/10
In this work we consider the most general electromagnetic theory in curved space-time leading to linear second order differential equations, including non-minimal couplings to the space-time curvature...
Time-variability in the Interstellar Boundary Conditions of the Heliosphere over the past 60,000 years: Impact of the Solar Journey on the Galactic Cosmic Ray Flux at Earth
Time-variability the Interstellar Boundary Conditions
2011/1/10
During the solar journey through galactic space, variations in the physical properties of the surrounding interstellar material (ISM) modify the heliosphere and modulate the flux of galactic cosmic ra...
Cosmic Ray e^+/(e^- + e^+) and pbar/p Ratios Explained by an Injection Model Based on Gamma-ray Observations
High Energy Astrophysical Phenomena (astro-ph.HE)
2011/1/6
We present a model of cosmic ray injection into the Galactic space based on recent gamma-ray observations of supernova remnants (SNRs) and pulsar wind nebulae (PWNe) by the Fermi Large Area Telescope ...
Investigating the Cosmic-Ray Ionization Rate Near the Supernova Remnant IC 443 Through H3+ Observations
High Energy Astrophysical Phenomena (astro-ph.HE)
2011/1/6
Observational and theoretical evidence suggests that high-energy Galactic cosmic rays are primarily accelerated by supernova remnants. If also true for low-energy cosmic rays, the ionization rate near...
CRT: A numerical tool for propagating ultra-high energy cosmic rays through Galactic magnetic field models
Instrumentation and Methods for Astrophysics (astro-ph.IM)
2011/1/6
Deflection of ultra high energy cosmic rays (UHECRs) by the Galactic magnetic field (GMF) may be sufficiently strong to hinder identification of the UHECR source distribution. A common method for dete...
Cosmic ray propagation time scales: lessons from radioactive nuclei and positron data
High Energy Astrophysical Phenomena (astro-ph.HE) High Energy Physics - Phenomenology (hep-ph)
2011/1/4
We take a fresh look at high energy radioactive nuclei data reported in the 90's and at the positron data recently reported by PAMELA. Our aim is to study the model independent implications of these d...
Analytic Solutions of Ultra-High Energy Cosmic Ray Nuclei Revisited
High Energy Astrophysical Phenomena (astro-ph.HE) High Energy Physics - Phenomenology (hep-ph)
2011/1/5
The chemical composition of ultra-high energy cosmic rays is a key question in particle astrophysics. The measured composition, inferred from the elongation rates of cosmic ray showers, looks in gener...
Diffusive Cosmic Ray Acceleration at the Galactic Centre
High Energy Astrophysical Phenomena (astro-ph.HE)
2011/1/5
The diffuse TeV emission detected from the inner $\sim2^\circ$ of the Galaxy appears to be strongly correlated with the distribution of molecular gas along the Galactic ridge. Although it is not yet e...