Axion-Plasmon Polaritons in Strongly Magnetized Plasmas

Abstract

Axions are hypothetical particles related to the violation of the charge-parity symmetry within the strong sector of the standard model, being one of the most prone candidates for dark matter. Multiple attempts to prove their existence are currently performed in different physical systems. Here, we predict that axions may couple to the electrostatic (Langmuir) modes of a strongly magnetized plasma, and show that a new quasiparticle can be defined, the axion-plasmon polariton. The excitation of axions can be inferred from the pronounced modification of the dispersion relation of the Langmuir waves, a feature that we estimate to be accessible in state-of-the-art plasma-based experiments.

Duality-symmetric axion electrodynamics and haloscopes of various geometries

“…whereas ω = k 2 c 2 + ω 2 a and ω a = m a c 2 / . Substituting B 0 = B 0 (r), E 0 = 0 and a(r, t) from Equation (20) into Equation (18), we obtain the axion-induced electromagnetic field E ind = cg aγγ a(r, t)B 0 (r) + E E E(r, ω)e −ıωt dω, (21a)…”

“…a a 2 is axion self Lagrangian which preserves the duality relation under the substitution of axion coupled term, ω a is the angular frequency of the axion 's oscillation and g aγγ is axion-biphoton coupling constant [16]. From equation (1), the new set of modified Maxwell equations proposed by L. Visinelli is manifested as the following [12,13,17,18]:…”

“…Therefore, in the viewpoint of duality conservation, the conventional axion electrodynamics equations (4) are valid if and only if there is magnetic monopole sources ρ m = 0, J m = 0. Inversely, when there is no magnetic monopole sources ρ m = 0, J m = 0, the axion electrodynamics equations becomes [12,13,17,18] ∇ ∇ ∇ • (E − cg aγγ aB) = ρ e ε 0 (6a)…”

Field quantization in quantum plasmas: Photon and plasmon charge and mass

“…Importance of quantum plasmas, and its different areas of research, is now well understood: from solid-state physics [1] to laser fusion and laser-plasma interactions in the ultra-intense regime, [2][3][4] matter in extreme conditions, [5,6] dense plasmas in astrophysics, [7] quantum free-electron lasers, [8] neutrino hydrodynamics, [9][10][11] and axion-plasma physics. [12][13][14][15] Inside such a broad area of knowledge, we can nevertheless identify two basic problems. One is associated with electron quantization and the other with electromagnetic field quantization.…”

Axion production in unstable magnetized plasmas

“…For that, we exploit the beam-stream instability triggered by a monoenergetic electron beam to convert plasmons into axions. The production mechanism is based on the transfer of energy from the electrons to the small axionplasmon admixture, the later being a consequence of the axion-plasmon polariton coupling occurring in magnetized plasmas [38]. An estimation of the sequent conversion of the axion into a photon in a transverse magnetic field suggests that our schemes can compete with some of the existing light-shining-through-a-wall experiments such as ALPS and OSQAR [21,54,55].…”