Fundamental implications of intergalactic magnetic field observations

Vachaspati, Tanmay

doi:10.1103/physrevd.95.063505

Cited by 13 publications

(7 citation statements)

References 66 publications

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“…Ref. [24], where such a velocity was not taken into account. There remains also an interesting possibility to replace the vanishing CME by the contribution of the axion field to MHD, as pointed out recently in Ref.…”

Section: Discussionmentioning

confidence: 99%

Influence of the turbulent motion on the chiral magnetic effect in the early universe

Dvornikov

Semikoz

2017

Phys. Rev. D

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We study the magnetohydrodynamics of relativistic plasmas accounting for the chiral magnetic effect (CME). To take into account the evolution of the plasma velocity, obeying the Navier-Stokes equation, we approximate it by the Lorentz force accompanied by the phenomenological drag time parameter. On the basis of this ansatz, we obtain the contributions of both the turbulence effects, resulting from the dynamo term, and the magnetic field instability, caused by the CME, to the evolution of the magnetic field governed by the modified Faraday equation. In this way, we explore the evolution of the magnetic field energy and the magnetic helicity density spectra in the early Universe plasma. We find that the right-left electron asymmetry is enhanced by the turbulent plasma motion in a strong seed magnetic field compared to the pure the CME case studied earlier for the hot Universe plasma in the same broken phase.

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Section: Discussionmentioning

confidence: 99%

Influence of the turbulent motion on the chiral magnetic effect in the early universe

Dvornikov

Semikoz

2017

Phys. Rev. D

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“…[58] for a review). A detection of the PMF would offer an invaluable insight into the physics of the early Universe [59,60]. Inflationary models of magnetogenesis [55,56], by nature, have to result in an approximately scale-invariant PMF spectrum not to be ruled out.…”

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confidence: 99%

Relieving the Hubble Tension with Primordial Magnetic Fields

2020

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The standard cosmological model determined from the accurate cosmic microwave background measurements made by the Planck satellite implies a value of the Hubble constant H 0 that is 4.2 standard deviations lower than the one determined from type Ia supernovae. The Planck best fit model also predicts higher values of the matter density fraction Ω m and clustering amplitude S 8 compared to those obtained from the Dark Energy Survey Year 1 data. Here we show that accounting for the enhanced recombination rate due to additional small-scale inhomogeneities in the baryon density may solve both the H 0 and the S 8 -Ω m tensions. The additional baryon inhomogeneities can be induced by primordial magnetic fields present in the plasma prior to recombination. The required field strength to solve the Hubble tension is just what is needed to explain the existence of galactic, cluster, and extragalactic magnetic fields without relying on dynamo amplification. Our results show clear evidence for this effect and motivate further detailed studies of primordial magnetic fields, setting several well-defined targets for future observations.

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“…The last observable we describe here concerns the probing of magnetic helicity of IGMFs using gamma rays and was first suggested in [277]. Since then, it has been further extended and investigated in a significant number of publications [278][279][280][281][282][283][284][285][286][287]. There it was shown that the helical part of the magnetic field spectrum (see Equation ( 5)) has a direct impact on the morphology of the halo around the gamma-ray source.…”

Section: Analytical Description Of Propagation and Observablesmentioning

confidence: 99%

The Gamma-ray Window to Intergalactic Magnetism

Batista

Saveliev

2021

Universe

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One of the most promising ways to probe intergalactic magnetic fields (IGMFs) is through gamma rays produced in electromagnetic cascades initiated by high-energy gamma rays or cosmic rays in the intergalactic space. Because the charged component of the cascade is sensitive to magnetic fields, gamma-ray observations of distant objects such as blazars can be used to constrain IGMF properties. Ground-based and space-borne gamma-ray telescopes deliver spectral, temporal, and angular information of high-energy gamma-ray sources, which carries imprints of the intervening magnetic fields. This provides insights into the nature of the processes that led to the creation of the first magnetic fields and into the phenomena that impacted their evolution. Here we provide a detailed description of how gamma-ray observations can be used to probe cosmic magnetism. We review the current status of this topic and discuss the prospects for measuring IGMFs with the next generation of gamma-ray observatories.

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Fundamental implications of intergalactic magnetic field observations

Cited by 13 publications

References 66 publications

Influence of the turbulent motion on the chiral magnetic effect in the early universe

Influence of the turbulent motion on the chiral magnetic effect in the early universe

Relieving the Hubble Tension with Primordial Magnetic Fields

The Gamma-ray Window to Intergalactic Magnetism

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