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Magnetic Fields in the Early Universe
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Magnetic Fields in the Early Universe
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This review concerns the origin and the possible effects of magnetic fields in the early Universe. We start by providing to the reader with a short overview of the current state of art of observations of cosmic magnetic fields. We then illustrate the arguments in favour of a primordial origin of magnetic fields in the galaxies and in the clusters of galaxies. We argue that the most promising way to test this hypothesis is to look for possible imprints of magnetic fields on the temperature and polarization anisotropies of the cosmic microwave background radiation (CMBR). With this purpose in mind, we provide a review of the most relevant effects of magnetic fields on the CMBR. A long chapter of this review is dedicated to particle physics inspired models which predict the generation of magnetic fields during the early Universe evolution. Although it is still unclear if any of these models can really explain the origin of galactic and intergalactic magnetic fields, we show that interesting effects may arise anyhow. Among these effects, we discuss the consequences of strong magnetic fields on the big-bang nucleosynthesis, on the masses and couplings of the matter constituents, on the 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 also dicussed.
Forward citations
Cited by 13 Pith papers
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Holographic entanglement entropy under external magnetic field from the EMD model
Entanglement entropy in a holographic QCD model with a magnetic field develops a swallow-tail and becomes multivalued at large chemical potential, mirroring the model's own thermodynamic phase transitions.
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Proposes that axion-photon conversion in pre-CMB helical magnetic fields imprints detectable V-mode polarization in the CMB, allowing CLASS 40 GHz observations to constrain ALP masses 10^{-10} to 10^{-8} eV and their ...
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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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Line-of-sight magnetic-field propagation effects on axion-like particle constraints from GRB 221009A
Intergalactic magnetic field strength, coherence scale, and stochastic properties significantly alter ALP exclusion contours from GRB 221009A, while host-galaxy and Milky Way fields cause only mild changes.
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Chiral Plasma under Strong Magnetic Fields: A Holographic Analysis of Transport Phenomena
Holographic U(1)V x U(1)A Maxwell-Chern-Simons theory in Schwarzschild-AdS5 yields thirteen momentum- and B-field-dependent transport coefficient functions for chiral plasma currents, applied to negative magnetoresist...
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Audible Axion Magnetogenesis: Linking Intergalactic Magnetic Fields and Gravitational Waves
Axion-like particles in the trapped misalignment mechanism produce observable gravitational waves while generating intergalactic magnetic fields that exceed blazar lower bounds in the parameter space promising for gra...
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Primordial Magnetogenesis and Gravitational Waves from ALP-assisted Phase Transition
ALP-assisted first-order phase transitions can explain observed intergalactic magnetic fields and produce detectable gravitational waves, linking cosmology with particle physics searches.
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$\pi^0$-$\gamma$ mixing in the presence of a strong magnetic field
In the NJL model, π⁰-γ mixing under strong B fields affects only one polarization state and produces less than 15% change in pion mass and quark couplings up to 1 GeV²/e, at variance with earlier results.
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Holographic entanglement entropy under external magnetic field from the EMD model
Holographic entanglement entropy exhibits a swallow-tail structure indicating connected-to-disconnected transitions for perpendicular magnetic fields in the QCD phase diagram while remaining monotonic for parallel fie...
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Electromagnetic response of a relativistic drifting plasma
Time-dependent electric fields in relativistic drifting plasma induce polarization drift that modifies the induced current structure, with quantitative estimates of Hall and polarization contributions provided for the...
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Gravitational waves from holographic first-order QCD phase transition with magnetic field
In holographic QCD models, a stronger external magnetic field shifts the gravitational-wave peak from the first-order confinement transition to lower frequencies, with signals potentially visible to IPTA and SKA.
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Dense and Cold Magnetized Quark Matter: A Review of Magnetic-Field-Independent Regularization and the Medium Separation Scheme
MFIR plus MSS regularization of the NJL model keeps the 2SC superconducting gap finite at large chemical potential under magnetic fields and eliminates spurious normal-phase transitions and de Haas–van Alphen artifacts.
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Dense and Cold Magnetized Quark Matter: A Review of Magnetic-Field-Independent Regularization and the Medium Separation Scheme
Review of MFIR and MSS schemes showing the superconducting gap stays finite at high chemical potential in magnetized cold quark matter with no zero-temperature transition to normal phase.
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