Magnetic fields in the early universe

Magnetic fields in the early universe This review concerns the origin and the possible e!ects of magnetic "elds in the early Universe. We start byproviding the reader with a short overview of the current state of the art of observations of cosmic magnetic"elds. We then illustrate the arguments in favor of a primordial origin of magnetic "elds in the galaxies and inthe clusters of galaxies. We argue that the most promising way to test this hypothesis is to look for possibleimprints of magnetic "elds on the temperature and polarization anisotropies of the cosmic microwavebackground radiation (CMBR). With this purpose in mind,we provide a review of the most relevant e!ects ofmagnetic "elds on the CMBR. A long chapter of this review is dedicated to particle-physics-inspired modelswhich predict the generation of magnetic "elds during the early Universe evolution. Although it is stillunclear if any of these models can really explain the origin of galactic and intergalactic magnetic "elds,weshow that interesting e!ects may arise anyhow. Among these e!ects,we discuss the consequences of strongmagnetic "elds on the big-bang nucleosynthesis,on the masses and couplings of the matter constituents, onthe electroweak phase transition,and on the baryon and lepton number violating sphaleron processes.Several intriguing common aspects,and possible interplay, of magnetogenesis and baryogenesis are alsodiscussed.

Autor (-toren): Grasso D., Rubinstein R.Seiten: 104     Jahr: 2000

Tags: rubinstein grasso fields universe magnetic

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