1,720,970 research outputs found
The chiral magnetic effect in a cylindrical domain
Get PDFWe compute the Chiral Magnetic Effect (CME) in a cylindrical region coaxial with the external magnetic field. As the boundary condition we require vanishing of the radial component of the electric current on the cylinder side wall. We find that when the magnetic length is comparable or larger than the cylinder radius, the CME is suppressed compared to the corresponding result in infinite medium. As a result, for a given cylinder radius, the suppression is stronger in weak fields. We argue that the electric current generated by the CME vanishes at the cylinder wall and monotonically increases towards the symmetry axis.This is a pre-print of the article Buzzegoli, Matteo, and Kirill Tuchin. "The chiral magnetic effect in a cylindrical domain." arXiv preprint arXiv:2305.13149 (2023). DOI: 10.48550/arXiv.2305.13149. Copyright 2023 The Authors. Attribution 4.0 International (CC BY 4.0).
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Synchrotron radiation by slowly rotating fermions
Get PDFThis article is published as Buzzegoli, Matteo, Jonathan D. Kroth, Kirill Tuchin, and Nandagopal Vijayakumar. "Synchrotron radiation by slowly rotating fermions." Physical Review D 107, no. 5 (2023): L051901.
DOI: 10.1103/PhysRevD.107.L051901.
Attribution 4.0 International (CC BY 4.0).
Copyright 2023 The Authors.
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Quasi-Classical Approximation of Electromagnetic Radiation by Fermions embedded in Rigidly Rotating Medium in Strong Magnetic Field
Get PDFWe develop the quasi-classical (WKB) approximation of the synchrotron radiation by a fermion embedded into uniformly rotating system in external magnetic field. We show that it gives an accurate approximation of the exact expression that we recently obtained at a tiny fraction of the numerical cost. Our results can be used to compute the electromagnetic radiation of the quark-gluon plasma produced in relativistic heavy-ion collisions.This preprint is from Buzzegoli, Matteo, Kirill Tuchin, and Nandagopal Vijayakumar. "Quasi-Classical Approximation of Electromagnetic Radiation by Fermions embedded in Rigidly Rotating Medium in Strong Magnetic Field." arXiv preprint arXiv:2503.06649 (2025). doi: https://doi.org/10.48550/arXiv.2503.06649
Causal fermion states in magnetic field in relativistic rotating frame and electromagnetic radiation by rapidly rotating charge
Get PDFWe consider the Dirac field uniformly rotating with angular velocity Ω and also subject to the constant magnetic field B directed along the rotation axis. The causal states are constrained to the interior of the light cylinder of radius c/Ω. When this radius is smaller than the system size, as in the quark-gluon plasma, the effect of the boundary on the fermion spectrum is critical. We derive the fermion spectrum and study its properties. We compute the intensity of the electromagnetic radiation emitted due to transitions between the fermion states. We study its dependence on energy and angular momentum for different values of the angular velocity and the magnetic field. Rotation has enormous impact on the electromagnetic radiation by the quark-gluon plasma with or without the magnetic field.This is a preprint from Buzzegoli, Matteo, and Kirill Tuchin. "Causal fermion states in magnetic field in relativistic rotating frame and electromagnetic radiation by rapidly rotating charge." arXiv preprint arXiv:2405.19530 (2024). doi: https://doi.org/10.48550/arXiv.2405.19530. Copyright 2024 The Authors. CC-BY
Bound states and electromagnetic radiation of relativistically rotating cylindrical wells
Get PDFWe compute the effect of rigid rotation on the non-relativistic bound states. The energy levels of the bound states increase with the angular velocity of rotation until at certain value of the angular velocity they are completely pushed out into the continuum which corresponds to dissociation of the bound states. When the angular velocity exceeds the critical value at which the ground state disappears into the continuum, no bound state is possible. This effect should have important consequences for the phenomenology of the quark-gluon plasma. One of the ways to study it experimentally is to observe the electromagnetic radiation emitted by a rotating bound state. We compute the corresponding intensity of electromagnetic radiation and show that it strongly depends on the angular velocity of rotation.This is a manuscript of an article published as Buzzegoli, Matteo, and Kirill Tuchin. "Bound states and electromagnetic radiation of relativistically rotating cylindrical wells." Nuclear Physics A 1030 (2023): 122577.
DOI: 10.1016/j.nuclphysa.2022.122577.
Copyright 2022 Elsevier B.V.
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0).
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Photon radiation by relatively slowly rotating fermions in magnetic field
Get PDFWe study the electromagnetic radiation by a fermion carrying an electric charge q embedded in a medium rotating with constant angular velocity Ω parallel or anti-parallel to an external constant magnetic field B. We assume that the rotation is "relatively slow"; namely, that the angular velocity Ω is much smaller than the inverse magnetic length qB−−−√. In practice, such angular velocity can be extremely high. The fermion motion is a superposition of two circular motions: one due to its rigid rotation caused by forces exerted by the medium, another due to the external magnetic field. We derive an exact analytical expression for the spectral rate and the total intensity of this type of synchrotron radiation. Our numerical calculations indicate very high sensitivity of the radiation to the angular velocity of rotation. We show that the radiation intensity is strongly enhanced if qB and Ω point in the same direction and is suppressed otherwise.This is a pre-print of the article Buzzegoli, Matteo, Jonathan D. Kroth, Kirill Tuchin, and Nandagopal Vijayakumar. "Photon radiation by relatively slowly rotating fermions in magnetic field." arXiv preprint arXiv:2306.03863 (2023).
DOI: 10.48550/arXiv.2306.03863.
Copyright 2023 The Authors.
Attribution 4.0 International (CC BY 4.0).
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Thermodynamic equilibrium of massless fermions with vorticity, chirality and magnetic field
No full textSpin polarization induced by magnetic field and the relativistic Barnett effect
Get PDFFirst, I study the analogy between the magnetization of a material and the
spin polarization of particles in a fluid. Using the relativistic version of
the Barnett effect, i.e. the magnetization of a material induced by mechanical
rotation, the spin polarization induced by thermal vorticity is obtained within
a purely classical model, where spin is treated as an intrinsic magnetic moment
and rotation is included as a non-inertial effect. I argue that since spin
polarization induced by thermal vorticity can be obtained in a classical
theory, it can not be dominated by quantum anomalies.
Second, the spin polarization induced by magnetic field is obtained for a
fluid at local thermal equilibrium using statistical quantum field theory. The
obtained formula is valid beyond the weak field approximation and when
contributions from the non-homogeneity of the magnetic field are small. The
exact form of spin polarization is studied for a free Dirac field at global
equilibrium, and, like magnetic susceptibility, it oscillates according to the
de Haas - van Alphen effect.
Finally, I briefly review how magnetic field contributes to the difference
between the spin polarization of and observed in
heavy-ion collisions.Comment: 38 pages, 4 figures; V2: new abstract, added a figure, final versio
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