Magnetic fields in the galactic Universe, as observed in supershells, galaxies, intergalactic and cosmic realms

Vallée, J. P.

doi:10.1016/j.newar.2011.01.002

Cited by 72 publications

(86 citation statements)

References 601 publications

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“…(34). The dielectric tensor is also affected by the pseudomagnetic field B 0,5 and the chiral chemical potential µ 5 . By taking into account that b 0 = −µ 5 /e in equilibrium, we find that ε ml is symmetric with respect to the replacement (B 0,5 , µ 5 ) → (B 0 , µ).…”

Section: Polarization Vector and Characteristic Equationmentioning

confidence: 99%

“…(43), a gapless mode can be naturally realized in parity-odd Weyl materials under strain. The corresponding materials are characterized by a strain-induced background pseudomagnetic field B 0,5 and a nonzero chiral chemical potential µ 5 . In equilibrium, the latter is determined by the energy separation between the Weyl nodes, i.e., µ 5 = −eb 0 .…”

Section: Low-energy Collective Modesmentioning

confidence: 99%

“…Some of them, for example, are connected with the unusual plasma response to a background pseudomagnetic field B 5 . Unlike an ordinary magnetic field B, a pseudomagnetic one couples with different signs to fermions of different chiralities.…”

Section: Introductionmentioning

confidence: 99%

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Pseudomagnetic helicons

et al. 2017

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The existence of pseudomagnetic helicons is predicted for strained Dirac and Weyl materials. The corresponding collective modes are reminiscent of the usual helicons in metals in strong magnetic fields but can exist even without a magnetic field due to a strain-induced background pseudomagnetic field. The properties of both pseudomagnetic and magnetic helicons are investigated in Weyl matter using the formalism of the consistent chiral kinetic theory. It is argued that the helicon dispersion relations are affected by the electric and chiral chemical potentials, the chiral shift, and the energy separation between the Weyl nodes. The effects of multiple pairs of Weyl nodes are also discussed. A simple setup for experimental detection of pseudomagnetic helicons is proposed.

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Section: Polarization Vector and Characteristic Equationmentioning

confidence: 99%

Section: Low-energy Collective Modesmentioning

confidence: 99%

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Pseudomagnetic helicons

et al. 2017

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“…Stars enter and leave the arms in their quasicircular dynamical orbits around the Galactic center (adapted from Roberts 1975). Outside the arms, the Galactic orbits for gas in the gravitational potential were likened to a "4-segment spiral" (Vallée 2011; his Figure 37).…”

Section: Data Mining and New Statistics-cross-cut Of An Arm Widthmentioning

confidence: 99%

The Spiral Arms of the Milky Way: The Relative Location of Each Different Arm Tracer Within a Typical Spiral Arm Width

Vallée

2014

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111

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From the Sun's location in the Galactic disk, different arm tracers (CO, H i, hot dust, etc.) have been employed to locate a tangent to each spiral arm. Using all various and different observed spiral arm tracers (as published elsewhere), we embark on a new goal, namely the statistical analysis of these published data (data mining) to statistically compute the mean location of each spiral arm tracer. We show for a typical arm cross-cut, a separation of 400 pc between the mid-arm and the dust lane (at the inner edge of the arm, toward the Galactic center). Are some arms major and others minor? Separating arms into two sets, as suggested by some, we find the same arm widths between the two sets. Our interpretation is that we live in a multiple (four-arm) spiral (logarithmic) pattern (around a pitch angle of 12• ) for the stars and gas in the Milky Way, with a sizable interarm separation (around 3 kpc) at the Sun's location and the same arm width for each arm (near 400 pc from mid-arm to dust lane).

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“…The Milky Way and other spiral galaxies have coherent magnetic fields of μG-order magnitude, while galaxy clusters and remote protogalactic clouds also carry fields of similar strength (Han & Wielebinski 2002, Vallée 2011. Moreover, recently, there have been independent reports of relatively strong magnetic fields (around 10 −15 G) in intergalactic voids (Neronov 2010, Tavecchio et al 2010, Ando & Kusenko 2010.…”

mentioning

confidence: 99%