Lepton asymmetries and primordial hypermagnetic helicity evolution

Semikoz, V. B.; Sokoloff, D.; Valle, J. W. F.

doi:10.1088/1475-7516/2012/06/008

Cited by 32 publications

(39 citation statements)

References 22 publications

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“…14 The initial temperature in our calculation 13 It should be noted if magnetic fields are partially helical at their generation, the helical part decays slower than the non-helical part due to the inverse cascade process and they eventually reach the maximal helical state [40,54]. Therefore our assumption that the present magnetic fields are maximally helical is valid for a broad class of initial conditions.…”

Section: Numerical Resultsmentioning

confidence: 89%

Large-scale magnetic fields can explain the baryon asymmetry of the Universe

2016

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Helical hypermagnetic fields in the primordial Universe can produce the observed amount of baryon asymmetry through the chiral anomaly without any ingredients beyond the Standard Model of particle physics. While they generate no B − L asymmetry, the generated baryon asymmetry survives the spharelon washout effect, because the generating process remains active until the electroweak phase transition. Solving the Boltzmann equation numerically and finding an attractor solution, we show that the baryon asymmetry of our Universe can be explained, if the present largescale magnetic fields indicated by the blazar observations have a negative helicity and existed in the early Universe before the electroweak phase transition. We also derive the upper bound on the strength of the helical magnetic field, which is tighter than the CMB constraint, to avoid the overproduction of baryon asymmetry.

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Section: Numerical Resultsmentioning

confidence: 89%

Large-scale magnetic fields can explain the baryon asymmetry of the Universe

2016

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“…(620), we find it much more convenient to utilize the Schwinger form of the fermion propagator (556), which consists of a simple phase, that breaks the translation invariance, and a translation invariant function. Taking into account that the Schwinger phase Φ(r ⊥ , r ′ ⊥ ) is linear in magnetic field, we arrive at the following alternative form of the weak field expansion of the fermion propagator in the linear in B approximation: 588) and (589).]…”

Section: Radiative Corrections To Axial Current Densitymentioning

confidence: 99%

Quantum field theory in a magnetic field: From quantum chromodynamics to graphene and Dirac semimetals

2015

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a b s t r a c tA range of quantum field theoretical phenomena driven by external magnetic fields and their applications in relativistic systems and quasirelativistic condensed matter ones, such as graphene and Dirac/Weyl semimetals, are reviewed. We start by introducing the underlying physics of the magnetic catalysis. The dimensional reduction of the low-energy dynamics of relativistic fermions in an external magnetic field is explained and its role in catalyzing spontaneous symmetry breaking is emphasized. The general theoretical consideration is supplemented by the analysis of the magnetic catalysis in quantum electrodynamics, chromodynamics and quasirelativistic models relevant for condensed matter physics. By generalizing the ideas of the magnetic catalysis to the case of nonzero density and temperature, we argue that other interesting phenomena take place. The chiral magnetic and chiral separation effects are perhaps the most interesting among them. In addition to the general discussion of the physics underlying chiral magnetic and separation effects, we also review their possible phenomenological implications in heavy-ion collisions and compact stars. We also discuss the application of the magnetic catalysis ideas for the description of the quantum Hall effect in monolayer and bilayer graphene, and conclude that the generalized magnetic catalysis, including both the magnetic catalysis condensates and the quantum Hall ferromagnetic ones, lies at the basis of this phenomenon. We also consider how an external magnetic field affects the underlying physics in a class of three-dimensional quasirelativistic condensed matter systems, Dirac semimetals. While at sufficiently low temperatures and zero density of charge carriers, such semimetals are expected to reveal the regime of the magnetic catalysis, the regime of Weyl semimetals with chiral asymmetry is realized at nonzero density. Finally, we discuss the interplay between relativistic quantum field theories (including quantum electrodynamics and quantum chromodynamics) in a magnetic field and noncommutative field theories, which leads to a new type of the latter, nonlocal noncommutative field theories.

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“…This violation is expressed by the current conservation equations, Many studies have investigated the connection between a primordial magnetic field (PMF) and the baryon asymmetry of the universe (BAU). Broadly speaking, the literature falls into three categories: PMF-from-BAU [15][16][17], BAU-from-PMF [18][19][20][21][22][23][24][25], and co-evolution [26][27][28][29][30][31][32][33]. As emphasized in Ref.…”

Section: Introductionmentioning

confidence: 99%

Baryogenesis from decaying magnetic helicity

2016

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As a result of the Standard Model chiral anomalies, baryon number is violated in the early universe in the presence of a hypermagnetic field with varying helicity. We investigate whether the matter / anti-matter asymmetry of the universe can be created from the decaying helicity of a primordial (hyper)magnetic field before and after the electroweak phase transition. In this model, baryogenesis occurs without (B −L)-violation, since the (B +L) asymmetry generated by the hypermagnetic field counteracts the washout by electroweak sphalerons. At the electroweak crossover, the hypermagnetic field becomes an electromagnetic field, which does not source (B + L). Although the sphalerons remain in equilibrium for a time, washout is avoided since the decaying magnetic helicity sources chirality. The relic baryon asymmetry is fixed when the electroweak sphaleron freezes out. Under reasonable assumptions, a baryon asymmetry of n B /s 4 × 10 −12 can be generated from a maximally helical, right-handed (hyper)magnetic field that has a field strength of B 0 10 −14 Gauss and coherence length of λ 0 1 pc today. Relaxing an assumption that relates λ 0 to B 0 , the model predicts n B /s 10 −10 , which could potentially explain the observed baryon asymmetry of the universe.

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Lepton asymmetries and primordial hypermagnetic helicity evolution

Cited by 32 publications

References 22 publications

Large-scale magnetic fields can explain the baryon asymmetry of the Universe

Large-scale magnetic fields can explain the baryon asymmetry of the Universe

Quantum field theory in a magnetic field: From quantum chromodynamics to graphene and Dirac semimetals

Baryogenesis from decaying magnetic helicity

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