Spin rotation of neutrinos produced by compact magnetized astrophysical objects

Exploring scalar-photon interactions in energetic astrophysical events

Scalar fields like dilaton appear in quantum field theory (QFT) due to scale symmetry breaking. Their appeal also extends to modified theories of gravity, like $F(R)$ gravity, Horva Lifshitz gravity etc. In unified theories they make their appearance through compactification of the extra dimension. Apart from resolving the issues of compactification scale and size, the particles of their fields can also turn out to be excellent candidate to solve the dark energy (DE) and dark matter (DM) problem of the universe. In this work we study their mixing dynamics with photons in a magnetized media, by…

Magnetized vector boson gas at any temperature

We study the thermodynamic properties of a relativistic magnetized neutral vector boson gas at any temperature. By comparing the results with the low temperature and the non relativistic descriptions of this gas, we found that the fully relativistic case can be separated in two regimes according to temperature. For low temperatures, magnetic field effects dominate and the system shows a spontaneous magnetization, its pressure splits in two components and, eventually, a transversal magnetic collapse might occur. In the high temperature region, the gas behavior is led by pair production. The pre…

Neutrino emission from a strongly magnetized degenerate electron gas: the Compton mechanism via a neutrino magnetic moment

We derive relative upper bounds on the effective magnetic moment of Dirac neutrinos from comparison of the standard weak and electromagnetic mechanisms of the neutrino luminosity due to the Compton-like photoproduction of neutrino pairs in a degenerate gas of electrons on the lowest Landau level in a strong magnetic field. These bounds are close to the known astrophysical and laboratory ones.

Signatures Of Scalar Photon Interaction In Astrophysical Situations

Dimension-5 photon ($γ$) scalar ($ϕ$) interaction terms usually appear in the Lagrangian of bosonic sector of unified theories of electromagnetism and gravity. This interaction makes the medium dichoric and induces optical activity. We have modelled the propagation of photons with this interaction in the environment of cold a magnetized compact star (White Dwarf (WD) or Neutron Star (NS)), assuming synchro-curvature process as the dominant mechanism of emission. We have tried to outline the polarimetric implications of photon-scalar coupling on the produced spectrum of these emissions in the s…

Matter-induced vertices for photon splitting in a weakly magnetized plasma

We evaluate the three-photon vertex functions at order $B$ and $B^{2}$ in a weak constant magnetic field at finite temperature and density with on shell external lines. Their application to the study of the photon splitting process leads to consider high energy photons whose dispersion relations are not changed significantly by the plasma effects. The absorption coefficient is computed and compared with the perturbative vacuum result. For the values of temperature and density of some astrophysical objects with a weak magnetic field, the matter effects are negligible.

旋转磁化全息QGP物质中的$J/Ψ$抑制

$J/Ψ$ suppression in a rotating magnetized holographic QGP matter

本文基于规范/引力对偶，在有限温度、化学势及电磁场和旋转条件下研究全息QGP中$J/Ψ$解离，揭示温度、化学势、旋转和电场促进解离，而磁场抑制解离，并识别磁场与旋转竞争的临界角速度。

爱因斯坦-德哈斯效应与演化中的磁化QCD物质中的诱导旋转

Einstein-de Haas effect and induced rotation in an evolving magnetized QCD matter

研究在动态膨胀的夸克-胶子等离子体中，利用准粒子模型计算爱因斯坦-德哈斯效应诱导的角速度，发现其随固有时增长并在高温下被抑制，揭示了自旋主导与惯性主导的磁场诱导旋转区域之间的交叉。

Quantum electrodynamical shocks and solitons in astrophysical plasmas

The nonlinear propagation of low-frequency circularly polarized waves in a magnetized dusty plasma is analyzed. It is found that wave steepening and shock formation can take place due to the presence of nonlinear quantum vacuum effects, thus giving rise to ultra-intense electromagnetic shocks. Moreover, it is shown that solitary wave structures are admitted even under moderate astrophysical conditions. The results may have applications to astrophysical plasmas, as well as next generation laser interactions with laboratory plasmas containing dust clusters.

Inverse magneto-rotational catalysis and the phase diagram of a rotating hot and magnetized quark matter

We study the properties of a hot and magnetized quark matter in a rotating cylinder in the presence of a constant magnetic field. To do this, we solve the corresponding Dirac equation using the Ritus eigenfunction method. This leads to the energy dispersion relation, Ritus eigenfunctions, and the quantization relation for magnetized fermions. To avoid causality-violating effects, we impose a certain global boundary condition, and study its effect, in particular, on the energy eigenmodes and the quantization relations of fermions. Using the fermion propagator arising from this method, we then s…

有限横向尺寸的旋转磁化π介子气体：凝聚约束与输运性质

Rotating magnetized pion gas of finite transverse size: condensation constraints and transport properties

研究旋转π介子气体在磁场中的电、热和热电响应，发现旋转作为有效化学势增强输运系数，克服磁场的抑制作用。

强磁场与刚性旋转下带电玻色气体的弱玻色-爱因斯坦凝聚

Weak Bose-Einstein condensation in a rigidly rotating magnetized charged Bose gas

该研究探讨了强磁场与刚性旋转下带电玻色气体的弱玻色-爱因斯坦凝聚，通过量子场论方法推导热力学势，发现旋转不改变弱BEC定性特征，还揭示了磁场与旋转对玻色子物质磁响应的竞争作用。

Birefringence, CMB polarization and magnetized B-mode

Even in the absence of a sizable tensor contribution, a B-mode polarization can be generated because of the competition between a pseudo-scalar background and pre-decoupling magnetic fields. By investigating the dispersion relations of a magnetoactive plasma supplemented by a pseudo-scalar interaction, the total B-mode polarization is shown to depend not only upon the plasma and Larmor frequencies but also on the pseudo-scalar rotation rate. If the (angular) frequency channels of a given experiment are larger than the pseudo-scalar rotation rate, the only possible source of (frequency dependen…

Short wavelength electromagnetic propagation in magnetized quantum plasmas

The quantum electrodynamical (QED) short wavelength correction on plasma wave propagation for a non-relativistic quantum plasma is investigated. A general dispersion relation for a thermal multi-component quantum plasma is derived. It is found that the classical dispersion relation for any wave mode can be modified to include quantum and short wavelength QED effects by simple substitutions of the thermal velocity and the plasma frequency. Furthermore, the dispersion relation has been modified to include QED effects of strong magnetic fields. It is found that strong magnetic fields together wit…