arXiv subjects

Zhang Bo

Publications and source records attributed to Zhang Bo.

3 recordsLinked to original sources

arXiv2025

Probing Dark Photons through Gravitational Decoupling of Mass-State Oscillations in Interstellar Media

We propose a novel mechanism for photon-dark photon mass state oscillations mediated by gravitational separation during propagation through the interstellar medium. This phenomenon establishes a new avenue for the detection of dark matter. By analyzing gravitational lensing data from quasars, we investigate the sensitivity of this approach to dark photons. Our analysis demonstrates constraints of$\epsilon<10^-2$ in the dark photon mass range of $10^{-14}eV$. Furthermore, we propose potential applications of this mechanism to astrophysical systems with strong gravitational fields, such as neutron stars and black hole accretion disks.

astro-ph.HE↗

arXiv2024

TV Mon -- post mass transfer Algol type binary with $\delta$ Scuti pulsations in primary component

We present a study of the detached eclipsing binary TV~Mon using spectra from the LAMOST medium-resolution survey and ASAS-SN, CoRoT photometry. We apply multiple-epochs spectral fitting to derive RV and spectral parameters. The analysis of eclipses in CoRoT data show the relative sizes of the stellar components and almost edge-on circular orbit. Combining the spectral and photometrical solutions we estimate masses and radii of the components: $M_{A,B}=2.063\pm0.033({\rm stat.})\pm0.095({\rm syst.}),~0.218\pm0.004({\rm stat.})\pm0.018({\rm syst.})~M_\odot$, $R_{A,B}=2.394\pm0.014,~2.860\pm0.016~R_\odot$. SED analysis and Gaia parallax allow us to get estimation of temperatures ${T_{ eff}}_{A,B}=7624^{+194}_{-174},~5184^{+130}_{-123}$ K and distance $d=907\pm11$ pc. We identify three $\delta$ Scuti type pulsation frequencies in the primary component, while we also suspect TV~Mon having a spot activity in the secondary component. This system experienced intensive mass transfer and mass ratio reversal in the past, but currently shows no signs of mass transfer in the spectra. The low mass component will lose its outer envelope and shrink to the helium white dwarf, the mass and orbital period of which are in good agreement with evolutionary models predictions.

astro-ph.SR↗

arXiv2015

Research on a new active power filter topology based on chopper circuit

The active power filter (APF) is attracting more and more attention for its outstanding performance in current and voltage ripple compensation. As modern high-energy accelerators are demanding much more stringent current ripple guideline, the APF is introduced to the magnet power supply (MPS) in accelerator system. However, the conventional APF has a lot of shortages and drawbacks due to its traditional topology, such as complex structure, nonadjustable working voltage, requirement of power supply, and so on. This paper proposes a new topology of APF, which is working as two types of chopper circuits. This APF need not extra electricity, but to use the power of the MPS current ripple to realize ripple depressing. At the end of this paper, the experiment result proves its feasibility and effect.

physics.acc-ph↗