Speaker
Description
High-Frequency Quasi-Periodic Oscillations (HF QPOs) are among the most intriguing phenomena
observed in Low-Mass X-ray Binaries (LMXBs) containing black holes or neutron stars. In this paper,
we investigate the dynamics of charged particles in the vicinity of a Schwarzschild-like black hole
immersed in a uniform magnetic field (MF) and surrounded by Cold Dark Matter (CDM). Our goal is
to gain deeper insight into how magnetic and dark matter distributions influence observable
phenomena near compact objects.
We begin by presenting a modified metric that incorporates the effects of CDM, and we explore
how both dark matter and magnetic fields affect the effective potential, stable circular orbits, and
escape conditions of ionized particles. Using a Hamiltonian formalism, we analyze the energy
boundaries and the innermost stable circular orbit (ISCO), demonstrating the combined effects of
CDM and a Uniform MF.
Furthermore, we compute the fundamental oscillation frequencies to examine how their variations
depend on the joint influence of CDM and magnetic field strength. The resulting frequency structure
enables us to identify resonance radii associated with HF QPOs, particularly those exhibiting the 3:2
ratios observed in microquasars. We also evaluate several theoretical models for QPO generation.
Our results emphasize the importance of including both magnetic and dark matter effects in strong
field astrophysics and support the interpretation of HF QPOs as sensitive probes of black hole
environments. This study opens new perspectives for exploring particle dynamics, accretion disk
structures, and potential observational signatures of dark matter in the vicinity of compact objects.
| Main Contribution topic | Astrophysical observations |
|---|---|
| Secondary contribution topic | Cosmology Dark Matter |