Axion Quark Nugget and NS: Difference between revisions

From FRB Theory Wiki
Jump to navigation Jump to search
Line 28: Line 28:
== Observational Constraints ==
== Observational Constraints ==


There is a maximum cut-off frequency at infra-red wavelengths, and thus counterparts with higher frequencies would invalidate the model.
The event rate is consistent with observation, but the emission timescale (∼ 10 − 100 ms) is larger than what is observed. This discrepancy can be accounted for if the beam moves across the sky, allowing us only a glimpse of the emission. A curvature radiation mechanism is invoked, which predicts a maximum cut-off frequency at infra-red wavelengths; observed counterparts with higher frequencies would invalidate this model. Given the random nature of these events, repeating FRBs would be non-periodic. A correlation between the total energy and duration of the flare is predicted, however because only a fraction of the entire beam would be observed, this relationship would be difficult to verify.

Revision as of 05:46, 10 October 2018





Summary Table
Category Progenitor Type Energy Mechanism Emission Mechanism Counterparts References Brief Comments
LF Radio HF Radio Microwave Terahertz Optical/IR X-rays Gamma-rays Gravitational Waves Neutrinos
Collision / Interaction Axion Quark Nuggest and NS Repeat Mag. reconnection Curv. Yes Possible Possible -- -- -- -- -- -- https://arxiv.org/pdf/1806.02352.pdf None

Definitions: LF Radio (3 MHz to 3 GHz); HF Radio (3 GHz to 30 GHz); Microwave (30 to 300 GHz)


Model Description

In close analogy with the axion quark nugget (AQN) mechanism for generating solar nano flares, an AQN falling through an opportunely complicated region in a NS’s magnetosphere may be able to produce sufficient magnetic energy to power FRBs. Shock waves caused by the infalling AQN would trigger magnetic reconnection, and produce a giant flare.

Observational Constraints

The event rate is consistent with observation, but the emission timescale (∼ 10 − 100 ms) is larger than what is observed. This discrepancy can be accounted for if the beam moves across the sky, allowing us only a glimpse of the emission. A curvature radiation mechanism is invoked, which predicts a maximum cut-off frequency at infra-red wavelengths; observed counterparts with higher frequencies would invalidate this model. Given the random nature of these events, repeating FRBs would be non-periodic. A correlation between the total energy and duration of the flare is predicted, however because only a fraction of the entire beam would be observed, this relationship would be difficult to verify.