Grand Unification in Neutron Stars

TL;DR

This paper reviews the diverse observational properties of neutron stars, discusses efforts towards a unified physical theory, and highlights recent results enabled by the Chandra X-ray Observatory.

Contribution

It provides a comprehensive survey of neutron star classes and discusses the current status of grand unification efforts in neutron star physics.

Findings

Diverse neutron star classes with unique properties

Chandra X-ray Observatory has enabled key observational insights

Progress towards a unified physical theory of neutron stars

Abstract

The last decade has shown us that the observational properties of neutron stars are remarkably diverse. From magnetars to rotating radio transients, from radio pulsars to `isolated neutron stars,' from central compact objects to millisecond pulsars, observational manifestations of neutron stars are surprisingly varied, with most properties totally unpredicted. The challenge is to establish an overarching physical theory of neutron stars and their birth properties that can explain this great diversity. Here I survey the disparate neutron stars classes, describe their properties, and highlight results made possible by the Chandra X-ray Observatory, in celebration of its tenth anniversary. Finally, I describe the current status of efforts at physical `grand unification' of this wealth of observational phenomena, and comment on possibilities for Chandra's next decade in this field.