A Comment on "A note on polarized light from Magnetars: QED effects and axion-like particles" by L.M. Capparelli, L. Maiani and A.D. Polosa

Turolla, R.; Zane, S.; Taverna, Roberto; Caniulef, Denis González; Mignani, R. P.; Testa, V.; Wu, K.

doi:10.48550/arxiv.1706.02505

Cited by 7 publications

(7 citation statements)

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“…In addition to these nonlinear QED contexts, searches for vacuum processes concern a wider range of research fields, including astrophysics and particle physics. For instance, a practical effect of VMB has been suggested by the recent observation of a strongly magnetized neutron star [12][13][14]. Furthermore, the vacuum process may be easily affected by the contribution of new physics beyond the Standard Model (BSM) [15].…”

Section: Introductionmentioning

confidence: 99%

Probing Physics in Vacuum Using an X-ray Free-Electron Laser, a High-Power Laser, and a High-Field Magnet

et al. 2017

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Abstract:A nonlinear interaction between photons is observed in a process that involves charge sources. To observe this process in a vacuum, there are a growing number of theoretical and experimental studies. This process may contain exotic contribution from new physics beyond the Standard Model of particle physics, and is probed by experiments using a high-power laser or a high-field magnet, and more recently using an X-ray free-electron laser (XFEL). Here, we review the present status of our experiments testing various vacuum processes. We describe four experiments with a focus on those using an XFEL: (i) photon-photon scattering in the X-ray region, (ii) laser-induced birefringence and diffraction of X rays, (iii) vacuum birefringence induced by a high-field magnet, and (iv) a dedicated search for axion-like particles using the magnet and X rays.

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Section: Introductionmentioning

confidence: 99%

Probing Physics in Vacuum Using an X-ray Free-Electron Laser, a High-Power Laser, and a High-Field Magnet

et al. 2017

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“…Recent astronomical observations hint at the existence of vacuum birefringence [25] (see also the remarks in [26,27]). However, a direct laboratory-based verification of this fundamental property of the vacuum is still missing.…”

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confidence: 99%

High-Energy Vacuum Birefringence and Dichroism in an Ultrastrong Laser Field

et al. 2017

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A long-standing prediction of quantum electrodynamics, yet to be experimentally observed, is the interaction between real photons in vacuum. As a consequence of this interaction, the vacuum is expected to become birefringent and dichroic if a strong laser field polarizes its virtual particle-antiparticle dipoles. Here, we derive how a generally polarized probe photon beam is influenced by both vacuum birefringence and dichroism in a strong linearly polarized plane-wave laser field. Furthermore, we consider an experimental scheme to measure these effects in the nonperturbative high-energy regime, where the Euler-Heisenberg approximation breaks down. By employing circularly polarized high-energy probe photons, as opposed to the conventionally considered linearly polarized ones, the feasibility of quantitatively confirming the prediction of nonlinear QED for vacuum birefringence at the 5σ confidence level on the time scale of a few days is demonstrated for upcoming 10 PW laser systems. Finally, dichroism and anomalous dispersion in vacuum are shown to be accessible at these facilities.

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“…1 (right) for the BB case. This is a clear indication that QED effects play a crucial role in setting the actual value of the polarisation degree, see also discussion in [20]. Therefore, this is the first, indirect though, observational evidence of the phenomenon of vacuum birefringence, as predicted by QED over 80 years ago [7].…”

Section: Observations and Resultsmentioning

confidence: 55%

Evidence of vacuum birefringence from the polarisation of the optical emission from an Isolated Neutron Star

Mignani,

Testa,

Caniulef

et al. 2017

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Isolated Neutron Stars are some of the most exciting stellar objects known to astronomers: they have the most extreme magnetic fields, with values up to 10 15 G, and, with the exception of stellar-mass black holes, they are the most dense stars, with densities of ≈ 10 14 g cm −3 . As such, they are perfect laboratories to test theories of electromagnetism and nuclear physics under conditions of magnetic field and density unattainable on Earth. In particular, the interaction of radiation with strong magnetic fields is the cause of the vacuum birefringence, an effect predicted by quantum electrodynamics in 1936 but that lacked an observational evidence until now. Here, we show how the study of the polarisation of the optical radiation from the surface of an isolated neutron star yielded such an observational evidence, opening exciting perspectives for similar studies at other wavelengths.

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A Comment on "A note on polarized light from Magnetars: QED effects and axion-like particles" by L.M. Capparelli, L. Maiani and A.D. Polosa

Cited by 7 publications

References 1 publication

Probing Physics in Vacuum Using an X-ray Free-Electron Laser, a High-Power Laser, and a High-Field Magnet

Probing Physics in Vacuum Using an X-ray Free-Electron Laser, a High-Power Laser, and a High-Field Magnet

High-Energy Vacuum Birefringence and Dichroism in an Ultrastrong Laser Field

Evidence of vacuum birefringence from the polarisation of the optical emission from an Isolated Neutron Star

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