Multi-messenger & multi-wavelength signatures of compact object transients

Astrophysical transients are sources that change as a function of time. These sources are often powered by injections of energy that power the acceleration and radiation of particles. If these transients are observed across the electromagnetic spectrum, or by different astrophysical messengers, we can better understand how particles behave and emit. In this thesis, I have sought to understand the multi-wavelength and multi-messenger counterparts to transient phenomena stemming from compact objects: black holes and neutron stars.
I studied X-ray and radio transients stemming from compact objects and used a variety of observational, theoretical and numerical techniques to understand how particles accelerate, radiate and propagate close to compact objects. Much of the research in this thesis focuses on better understanding how particle acceleration in highly magnetised regions might produce bright radio bursts powered by coherent emission mechanisms. This work is motivated by the recent discovery of fast radio bursts. In particular, I focus on understanding the global multi-messenger and multi-wavelength signatures of coherent emission mechanisms from highly magnetised neutron stars, and neutron star merger events. I make new predictions of these signatures to facilitate future observations aimed at opening up discovery space.