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Primordial Magnetic Fields
Production
Evolution cosmology
Evolution LSS
Detection of Magnetic Fields
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Magnetic fields are always present in all elements of the Large Scale
Structure (LSS) of the Universe, from weak in voids to strong in
starburst galaxies (1) (2) (3) (4). In galaxies and clusters of
galaxies, the strong field is produced by amplifying an initial "seed"
field, by compression and dynamo mechanisms (3). There are at least
two possible origins for the initial seed field: it might be
primordial, or it can be produced at the epoch of galaxy formation (2)
(12). Washout of baryons from galaxies which deposits baryons into the
intergalactic medium also spreads magnetic field in the LSS elements,
because the galactic winds and active galactic nuclei (AGN) driven
outflows are most probably magnetized (6) (7) . As a result, the
IGMF, which resides in the voids and filaments of the LSS could be (A)
of primordial origin (2) (4) or (B) produced at the epoch of structure
formation (2) (5) or (C) be the result of "baryonic feedback" process
(6) (7).
The aim of this research proposal is to ascertain whether measurements
of the IGMF can distinguish between these three possibilities and thereby provide useful insights into the physics of the Universe.
References:
(1) P.P.Kronberg, Rep.Progr.Phys. 57 (1994) 325.
(2) R.Durrer, A.Neronov, A and A. Rv. 21 (2013) 62 .
(3) R.Beck, A and A Rv. 24 (2015) 4.
(4) K.Subramanian, Rep.Progr.Phys. 79 (2016) 076901 .
(5) J.Donnert, K.Dolag, H.Lesch, E.Muller, MNRAS 392 (2009) 1008.
(6) S.Bertone, C.Vogt, T.Ensslin, MNRAS, 370 (2006) 319.
(7) A.M.Beck, M.Hanasz, H.Lesch, R.-S.Remus, F.A.Stayszyn, MNRAS 429 (2013) L60.
Acknowledgments
Financial support of this Project was provided in part by
- ANR, France
- RSF, Russia
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