Over recent decades, the role of torsion in gravity has been extensively investigated along
the main direction of bringing gravity closer to its gauge formulation and incorporating spin …

Extended Theories of Gravity can be considered as a new paradigm to cure shortcomings of
General Relativity at infrared and ultraviolet scales. They are an approach that, by …

In Einstein's gravitational theory, the spacetime is Riemannian, that is, it has vanishing
torsion and vanishing nonmetricity (covariant derivative of the metric). In the gauging of the …

In the course of the development of electromagnetic, weak and strong interactions, the
concept of (internal) gauge invariance grew up and established itself as an unavoidable …

This timely volume provides a broad survey of (2+ 1)-dimensional quantum gravity. It
emphasises the'quantum cosmology'of closed universes and the quantum mechanics of the …

Theoretical and experimental research on general relativity with torsion is reviewed. An
introductory section establishes definitions and notation, introduces tetrads, the …

There has been a surge of interest in effective non-Lorentzian theories of excitations with
restricted mobility, known as fractons. Examples include defects in elastic materials, vortex …

Cosmic strings, as topological spacetime defects, show striking resemblance to defects in
solid continua: distortions, which can be classified into disclinations and dislocations, are …

We study the phase space structure and the quantization of a pointlike particle in (2+ 1)-
dimensional gravity. By adding boundary terms to the first-order Einstein-Hilbert action, and …

Gapless fracton phases are characterized by the conservation of certain charges and their
higher moments. These charges generically couple to higher rank gauge fields. In this paper …