Generally relativistic description of fast magnetic reconnection induced by thermal electromotive force

TL;DR

This paper extends the relativistic description of magnetic reconnection to include fast reconnection driven by thermal electromotive forces, highlighting how gravitational effects influence observable properties in different frames.

Contribution

It introduces a relativistic model of fast magnetic reconnection induced by thermal electromotive force, incorporating gravitational effects and observational frame considerations.

Findings

Thermal electromotive force significantly increases reconnection rate.

Gravitational effects are negligible in local reconnection properties.

Observational frame impacts the perceived properties of reconnection.

Abstract

Many theoretical models were come up with to figure out the properties of magnetic reconnection process, among which the Sweet-Parker model is the most famous since it describes the magnetic reconnection in a concise way. However, the low reconnection rate expected by this model is generally not available in most astrophysical systems, which motivates people to seek fast reconnection models. Under the scheme of generalized magnetohydrodynamics (MHD) for pair plasma, a fast magnetic reconnection model was established, in which the thermal electromotive force plays a key role to remarkably increase the reconnection rate. In this work, I would like to extend the discussions in my previous work, about the generally relativistic description of Sweet-Parker model, to the description of fast magnetic reconnection induced by thermal electromotive force. I will revisit the fast reconnection model briefly to initialize my discussions and show how the thermal electromotive force impacts the reconnection rate. Next, some basic setups will be exhibited before discussing specific examples about how the properties of fast magnetic reconnection are modified by gravitational effect or in observations. Results in this work consolidate my opinion reiterated in my previous work that properties of magnetic reconnection would never be modified by gravitational effect significantly if the magnetic reconnection process occurs in a local scale while the modifications of properties could not be neglected when the process is detected by an observer who is moving with respect to the laboratory, in the rest frame of which the magnetic reconnection occurs.