Tracing Primordial Magnetic Fields with 21 cm Line Observations
نویسندگان
چکیده
منابع مشابه
Influence of primordial magnetic fields on 21 cm emission
Magnetic fields in the early universe can significantly alter the thermal evolution and the ionization history during the dark ages. This is reflected in the 21 cm line of atomic hydrogen, which is coupled to the gas temperature through collisions at high redshifts, and through the Wouthuysen-Field effect at low redshifts. We present a semi-analytic model for star formation and the build-up of ...
متن کاملPrimordial Magnetic Fields
The explanation of the observed galactic magnetic fields may require the existence of a primordial magnetic field. Such a field may arise during the early cosmological phase transitions, or because of other particle physics related phenomena in the very early universe reviewed here. The turbulent evolution of the initial, randomly fluctuating microscopic field to a large-scale macroscopic field...
متن کاملPrimordial Magnetic Fields
Large scale magnetic fields represent a triple point where cosmology, highenergy physics and astrophysics meet for different but related purposes. After reviewing the implications of large scale magnetic fields in these different areas, the rôle of primordial magnetic fields is discussed in various physical processes occurring prior to the decoupling epoch with particular attention to the big b...
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A primordial magnetic field could be responsible for the observed magnetic fields of the galaxies. One possibility is that such a primordial field is generated at the electroweak phase transition because of the fluctuations in the Higgs field gradients. I describe a statistical averaging procedure which gives rise to a field of a correct magnitude. Another possibility, where the Yang-Mills vacu...
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Galactic magnetic fields are observed of order ∼ 10−6G, but their origin is not definitely known yet. In this paper we consider the primordial magnetic fields generated in the early universe and analyse their effects on the density perturbations and the CMBR anisotropy. We assume that the random magnetic fields have the power law spectrum and satisfy the force-free field condition. The peak hei...
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ژورنال
عنوان ژورنال: Galaxies
سال: 2019
ISSN: 2075-4434
DOI: 10.3390/galaxies7010037