Magnetic Fields in Cosmic Particle Acceleration Sources

Cosmic Magnetic Fields From Particle Physics

I review a number of particle-physics models that lead to the creation of magnetic fields in the early universe and address the complex problem of evolving such primordial magnetic fields into the fields observed today. Implications for future observations of the Cosmic Microwave Background (CMB) are briefly discussed. Talk presented at the 7th International Symposium on Particles, Strings and ...

Monte-Carlo simulation of particle acceleration in braided magnetic fields

Supernova remnants are expected to contain braided (or stochastic) magnetic fields, which are in some regions directed mainly perpendicular to the shock normal. For particle acceleration due to repeated shock crossings, the transport in the direction of the shock normal is crucial. The mean squared deviation along the shock normal is then proportional to the square root of the time. This kind o...

Cosmic Magnetic Fields

New Type Scalar Fields for Cosmic Acceleration

We present a model where a non-conventional scalar field may act like dark energy leading to cosmic acceleration. The latter is driven by an appropriate field configuration, which result in an effective cosmological constant. The potential role of such a scalar in the cosmological constant problem is also discussed. ∗e-mail: [email protected] June 2006 During the last years, evidence of an accel...

Cosmic Acceleration, Scalar Fields and Observations

Conditions for accelerated expansion of Friedmann–Robertson–Walker space–time are analyzed. Connection of this scenario with present–day observations are reviewed. It is explained how a scalar field could be responsible for cosmic acceleration observed in present times and predicted for the very early Universe. Ideas aimed at answering whether is that the actual case for our Universe are descri...