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Magnetism in the Early Universe

Published online by Cambridge University Press:  03 March 2020

Tina Kahniashvili ,
Axel Brandenburg ,
Arthur Kosowsky ,
Sayan Mandal  and
Alberto Roper Pol
Tina Kahniashvili
Affiliation:
Department of Physics, Carnegie Mellon University, USA Abastumani Astrophysical Observatory, Ilia State University, Georgia
Axel Brandenburg
Affiliation:
Department of Physics, Carnegie Mellon University, USA Nordita, KTH Royal Institute of Technology & Stockholm University; Department of Astronomy, Stockholm University, Sweden; and JILA, University of Colorado at Boulder, USA Laboratory for Atmospheric and Space Physics, University of Colorado at Boulder, USA
Arthur Kosowsky
Affiliation:
Department of Physics and Astronomy and PITT PACC, University of Pittsburgh, USA
Sayan Mandal
Affiliation:
Department of Physics, Carnegie Mellon University, USA Abastumani Astrophysical Observatory, Ilia State University, Georgia
Alberto Roper Pol
Affiliation:
Abastumani Astrophysical Observatory, Ilia State University, Georgia Laboratory for Atmospheric and Space Physics, University of Colorado at Boulder, USA Department of Aerospace Engineering, University of Colorado at Boulder, USA
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Abstract

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Blazar observations point toward the possible presence of magnetic fields over intergalactic scales of the order of up to ∼1 Mpc, with strengths of at least ∼10−16 G. Understanding the origin of these large-scale magnetic fields is a challenge for modern astrophysics. Here we discuss the cosmological scenario, focussing on the following questions: (i) How and when was this magnetic field generated? (ii) How does it evolve during the expansion of the universe? (iii) Are the amplitude and statistical properties of this field such that they can explain the strengths and correlation lengths of observed magnetic fields? We also discuss the possibility of observing primordial turbulence through direct detection of stochastic gravitational waves in the mHz range accessible to LISA.

Keywords

Early UniverseCosmic Magnetic FieldsTurbulenceGravitational Waves
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium A30: Astronomy in Focus XXX , August 2018 , pp. 295 - 298
Copyright
© International Astronomical Union 2020

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