Tootfinder

An atom in front of Lorentz violating Kalb-Ramond black hole background
Anisur Rahaman
https://arxiv.org/abs/2506.01006 https://arxiv…

An atom in front of Lorentz violating Kalb-Ramond black hole background
We investigate the role of Lorentz violation in the acceleration radiation produced when an atom falls into a Kalb-Ramond (KR) black hole and observe that the amplitude and an exponential (Planck-like) factor are both shaped by the Lorentz-violating parameter, indicating a breach of the equivalence principle and resembling characteristics observed in bumblebee gravity models. We further investigate how Lorentz violation and conformal symmetry work together to determine the thermodyn…

This https://arxiv.org/abs/2505.24082 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Collimation of Fast Radio Burster 20201124A; Repeaters vs. Apparent Non-Repeaters
The recent report of a period in the active repeating Fast Radio Burster 20201124A and measurement of its spindown rate place bounds on the solid angle of its emission on the basis of energetics. The bound depends on the (unknown) efficiency of conversion of rotational energy to coherent radio emission and implies a lower bound on the Lorentz factor of the radiating charges. Bursts may be emitted along the magnetic dipole axis, in repeaters aligned with the rotational axis and the line of sight…

Collimation of Fast Radio Burster 20201124A; Repeaters vs. Apparent Non-Repeaters
J. I. Katz
https://arxiv.org/abs/2505.24082 https://

Collimation of Fast Radio Burster 20201124A; Repeaters vs. Apparent Non-Repeaters
The recent report of a period in the active repeating Fast Radio Burster 20201124A and measurement of its spindown rate place bounds on the solid angle of its emission on the basis of energetics. The bound depends on the (unknown) efficiency of conversion of rotational energy to coherent radio emission and implies a lower bound on the Lorentz factor of the radiating charges. Bursts may be emitted along the magnetic dipole axis, in repeaters aligned with the rotational axis and the line of sight…

This https://arxiv.org/abs/2503.15613 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Prompt Periodicity in the GRB 211211A Precursor: Black-hole or magnetar engine?
The merger origin long GRB 211211A was a class (re-)defining event. A precursor was identified with a $\sim 1$ s separation from the main burst, as well as a claimed candidate quasi-periodic oscillation (QPO) with a frequency $\sim20$ Hz. Here, we explore the implications of the precursor, assuming the quasi-periodicity is real. The precursor variability timescale requires relativistic motion with a Lorentz factor $Γ\gtrsim80$, and implies an engine driven jetted outflow. The declining amplitu…