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Progress on Cosmological Magnetic Fields
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abstract
A variety of observations impose upper limits at the nano Gauss level on magnetic fields that are coherent on inter-galactic scales while blazar observations indicate a lower bound $\sim 10^{-16}$ Gauss. Such magnetic fields can play an important astrophysical role, for example at cosmic recombination and during structure formation, and also provide crucial information for particle physics in the early universe. Magnetic fields with significant energy density could have been produced at the electroweak phase transition. The evolution and survival of magnetic fields produced on sub-horizon scales in the early universe, however, depends on the magnetic helicity which is related to violation of symmetries in fundamental particle interactions. The generation of magnetic helicity requires new CP violating interactions that can be tested by accelerator experiments via decay channels of the Higgs particle.
Forward citations
Cited by 7 Pith papers
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Spectra of magnetic fields from electroweak symmetry breaking
Magnetic fields generated at electroweak symmetry breaking have a k^4 energy spectrum, not k^3 as previously claimed, according to non-dynamical Kibble-mechanism simulations.
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Self-Consistent Parker Bound on Magnetic Monopoles
A self-consistent Parker bound on magnetic monopoles is derived using the galactic mean-field dynamo eigenmode and turbulent field seeding and acceleration, producing modified flux limits at low and intermediate masse...
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Primordial magnetic field from chiral plasma instability with sourcing
Adding a chirality source allows the chiral plasma instability to generate helical magnetic fields below the 80 TeV erasure temperature, with a helicity estimate confirmed by 1024^3 simulations.
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Inverse cascade from helical and nonhelical decaying columnar magnetic fields
Decaying columnar magnetic fields spontaneously isotropize and reproduce the expected helical and nonhelical MHD decay scalings, with the Hosking integral conserved for initially pointwise nonhelical fields.
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The art of simulating the early Universe. Part III: Scalar-Gauge-Fluid Dynamics
Detailed continuum-to-lattice schemes are given for perfect/imperfect fluids alone or coupled to scalars/gauges in FLRW, enabling self-consistent CosmoLattice simulations of early-Universe plasma dynamics and GWs.
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Forward cascade of large-scale primordial magnetic fields during structure formation
A flux-conservation advection equation reproduces the qualitative forward cascade of primordial magnetic field spectra during structure formation.
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The Hubble tension: A decade review
Pure early or late fixes to the Hubble tension are tightly constrained; remaining options are combined early-late interacting dark energy or new physics at the local-to-homogeneous transition.
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