Astrophysical wake acceleration driven by relativistic Alfvenic pulse emitted from bursting accretion disk

Ebisuzaki, Toshikazu; Tajima, T.

doi:10.1016/j.astropartphys.2021.102567

Cited by 6 publications

(1 citation statement)

References 99 publications

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“…This plasma wave is conventionally called wakefield and the concept of the direct particle acceleration by the wakefield via the Landau resonance, which is so-called wakefield acceleration (WFA), is first proposed in the study of laboratory plasmas (Tajima & Dawson 1979). The application of the WFA to the UHECR acceleration is discussed later in the context of astrophysics (e.g., Chen et al 2002;Arons 2003;Murase et al 2009;Ebisuzaki & Tajima 2014, 2021 and laboratory plasmas (e.g., Kuramitsu et al 2008Kuramitsu et al , 2011aKuramitsu et al ,b, 2012Liu et al 2017Liu et al , 2018Liu et al , 2019. In relativistic shocks, Lyubarsky (2006) first found the wakefield excitation via the SRS using 1D PIC simulations and recent 2D PIC simulations (Sironi & Spitkovsky 2011;Ligorini et al 2021a,b) confirmed that.…”

Section: Introductionmentioning

confidence: 99%

Particle Acceleration by Pickup Process Upstream of Relativistic Shocks

Iwamoto,

Amano,

Matsumoto

et al. 2021

Preprint

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Particle acceleration at magnetized purely perpendicular relativistic shocks in electron-ion plasmas are studied by means of two-dimensional particle-in-cell simulations. Magnetized shocks with the upstream bulk Lorentz factor γ 1 1 are known to emit intense electromagnetic waves from the shock front, which induce electrostatic plasma waves (wakefield) and transverse filamentary structures in the upstream region via the stimulated/induced Raman scattering and the filamentation instability, respectively. The wakefield and filaments inject a fraction of incoming particles into a particle acceleration process, in which particles are once decoupled from the upstream bulk flow by the wakefield, and are piked up again by the flow. The picked-up particles are accelerated by the motional electric field. The maximum attainable Lorentz factor is estimated as γ max,e ∼ αγ 3 1 for electrons and γ max,i ∼ (1 + m e γ 1 /m i )γ 2 1 for ions, where α ∼ 10 is determined from our simulation results. α can increase up to γ 1 for weakly magnetized shock if γ 1 is sufficiently large. This result indicates that highly relativistic astrophysical shocks such as external shocks of gamma-ray bursts can be an efficient particle accelerator.

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Section: Introductionmentioning

confidence: 99%

Particle Acceleration by Pickup Process Upstream of Relativistic Shocks

Iwamoto,

Amano,

Matsumoto

et al. 2021

Preprint

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Nonthermal particle spectra in ultra-intense laser–plasma interaction

Hu,

Geng,

Takabe

et al. 2024

Physics of Plasmas

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Relativistic laser–plasma interaction can produce nonthermal electron spectra in power-law scaling. The power-law index for near-critical density plasmas changes between 1.8 and 2.0 as the laser intensity varies from the relativistic threshold to the radiation-dominated regime. While effective temperature of electrons is strongly suppressed by radiation–radiation effect, it is found that the nonthermal power-laws are consistent between the radiation OFF and ON cases. It decreases to ∼1.4 as plasma density becomes over-critical. Similar to electrons, proton energy spectra also exhibit power-law distribution characteristics. As the laser intensity increases, the power-law index stabilizes around 1.6. We find that most nonthermal electrons constituting the power-law spectrum are distributed at the edge of the plasma channel as well as outside the channel, which is less sensitive to the radiation-reaction. This work provides a new physical mechanism relating to cosmic ray acceleration mechanisms in astrophysical environments with a strong electromagnetic field generated by neutron stars, relativistic collisionless shocks, and so on.

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Wakefield acceleration in the universe

Ebisuzaki¹,

Tajima²,

Barish³

2023

Int. J. Mod. Phys. D

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The important role of magnetic fields in the phenomena in and evolution of the Universe is well appreciated. A salient example of this is to make (often episodic) large magnetic fields in AGN accretion disks and their emanation of well-collimated and longitudinally extended astrophysical jets. Such typical cases or related astrophysical processes, we find, provide a fertile ground for exciting large-amplitude oscillations in the magnetic fields that constitute the spine of the jets. The energy sources of these oscillations can be traced originally to the gravitational energy of the central object. During their long propagation along the jet, because of the gradual changes of the density and magnetic fields, these large magnetic pulsations turn into relativistic amplitude electromagnetic (EM) pulses, which in turn induce intense wakefields that are capable of acceleration of electrons, positrons, and ions to high energies. In this review, we survey a variety of astrophysical objects ranging from as large as the cosmic AGN accretion disks and their jets to as small as microquasars, to find or predict that there exist common astrophysical processes of emission of high-energy particles and gamma (and other EM) emissions. A variety of these objects will be ideally observed and studied in the multimessenger astrophysical observations. One example that already stuck out was the case of the simultaneous observations of gravitational wave emission and gamma-ray pulse from the collision of the two neutron stars and their subsequent structure formation (such as a disk) around them.

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Astrophysical wake acceleration driven by relativistic Alfvenic pulse emitted from bursting accretion disk

Cited by 6 publications

References 99 publications

Particle Acceleration by Pickup Process Upstream of Relativistic Shocks

Particle Acceleration by Pickup Process Upstream of Relativistic Shocks

Nonthermal particle spectra in ultra-intense laser–plasma interaction

Wakefield acceleration in the universe

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