Photon splitting and Compton scattering in strongly magnetized hot plasma

Chistyakov, M. V.; Rumyantsev, D. A.; Stus, N. S.

doi:10.1103/physrevd.86.043007

Cited by 14 publications

(17 citation statements)

References 43 publications

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“…The photon splitting, a QED process that splits a high-energy photon into pair of low energy photons in presence of a pure magnetic field and/or magnetized plasma. No detailed calculation on the probabilities of these processes in the current scenario (B > B cr = 4.41 × 10 13 G with plasma) is available except a numerical calculation used in [4]. The environment affects the rate by changing photo dispersion properties of the region.…”

Section: Photon Splitting Process In the Magnetospherementioning

confidence: 99%

PeV Neutrinos from Local Magnetars

Dey

2018

XXII DAE High Energy Physics Symposium

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The paper estimates the flux of PeV neutrinos from magnetar polar caps, assuming that ions/protons are injected, and accelerated in these regions and interact with the radiative background. The present study takes into account the effect of the photon splitting mechanisms that should modify the radiative background, and enhance the neutrino flux at PeV energies, with a view to explain the PeV neutrino events detected in IceCube. The results indicate that in near future, a possibility of any significant excess of neutrino events from a magnetar in Milky Way is extremely low.

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Section: Photon Splitting Process In the Magnetospherementioning

confidence: 99%

PeV Neutrinos from Local Magnetars

Dey

2018

XXII DAE High Energy Physics Symposium

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“…We do not discuss here an influence of plasma effects on Compton scattering. The description of plasma effects was given in number of works [49,50].…”

Section: Introductionmentioning

confidence: 99%

Compton scatteringSmatrix and cross section in strong magnetic field

2016

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the ground to the arbitrary exited state was calculated by Daugherty & Harding [20] and by Meszaros [21]. However, these QED calculations assume infinitely long-lived intermediate state and, therefore, are more relevant to photon energies far from the resonances. In order to calculate the resonant cross section one has to introduce a finite lifetime or decay width to the virtual electrons for cyclotronic transitions to lower Landau levels [22]. For the specific case of ground-state to ground-state transition in the electron rest frame, when incident photons are parallel to the B-field, Gonthier et al. [23] showed that the commonly used spin-average width of Landau levels does not correctly account for the spin dependence of the temporal decay and results in a wrong value of the cross section at the resonance as well as at very low photon energies, where the level width becomes comparable to the energy of the initial photon.Scattering from the ground Landau level is commonly used as a basic approach in case of a strong field:heB/(m e c) > k B T , where k B is the Boltzmann constant and T is the electron temperature, when the majority of electrons occupy the ground energy level [2,4,6,10,[24][25][26][27][28]. For the case of initial electron on the ground Landau level and the initial photon with momentum parallel to the magnetic field direction, the cross section has only one resonance and takes the simplest form. A simple approximation for the scattering cross section in this case was found by Gonthier et al. [29]. Their approximation represents the exact cross section quite well below the resonance and above it even for extremely strong fields (B < 10 15 G).Moving electrons scatter the photons differently because of relativistic effects. As a result, the electron distribution over momentum affects the exact cross section and broadens the resonance features. This effect could be important for formation of spectral features in X-ray pulsars [30,31] and for the estimations of radiation pressure [8-10], because the resonant scattering increases the effective interaction cross section dramatically. It is also important to use correct Landau level width and calculate correctly the exact resonant cross section here. The influence of electron distribution varies much with the photon momentum direction because electrons take part mostly in a motion along the B-field lines and the corresponding Doppler broadening varies a lot [32,33]. The scattering cross section for the case of thermal electrons was calculated and compared with cyclotron absorption by Harding & Daugherty [32]. However, only polarization-averaged cross section for the case of initial electron at rest in the ground state was explored and an incorrect width of Landau levels based on Johnson-Lippmann wave-functions [34] was taken into account (see [35] and [23] for detailed discussion).Description of additional effects such as vacuum polarization, two-photon scattering [36], pair creation [37] demands the use of high order perturbation theory. They are beyon...

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“…In particular, the eigenvalues and eigenvectors of the corresponding photon polarization operator were found as a power expansion in the inverse magnetic field strength [45]. In this plasma there are only two physical states of the photon [44] which largely coincide with the photon polarization vectors in the constant uniform magnetic field [6,43] …”

Section: Strongly Magnetized Plasma a Analytic Calculationmentioning

confidence: 99%

“…The new polarization operator Π receives contributions from both the plasma and the external magnetic field. The eigenvalue problem is now rather complicated and has not yet been solved in the general case [44].…”

Section: Strongly Magnetized Plasma a Analytic Calculationmentioning

confidence: 99%

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Radiative decay of keV-mass sterile neutrinos in a strongly magnetized plasma

2014

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The radiative decay of sterile neutrinos with typical masses of 10 keV is investigated in the presence of a strong magnetic field and degenerate plasma. Full account is taken of the strongly modified photon dispersion relation relative to vacuum. The limiting cases of relativistic and non-relativistic plasma are analyzed. The decay rate in a strongly magnetized plasma as a function of the electron number density is compared with the un-magnetized case. We find that a strong magnetic field suppresses the catalyzing influence of the plasma on the decay rate.

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Photon splitting and Compton scattering in strongly magnetized hot plasma

Cited by 14 publications

References 43 publications

PeV Neutrinos from Local Magnetars

PeV Neutrinos from Local Magnetars

Compton scatteringSmatrix and cross section in strong magnetic field

Radiative decay of keV-mass sterile neutrinos in a strongly magnetized plasma

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