Born reciprocity and the granularity of space-time

TL;DR

This paper explores the implications of Born reciprocity in relativistic quantum mechanics, analyzing phase space geometry, semiclassical limits, and the emergence of space-time and matter through the lens of the quaplectic group and relativistic oscillators.

Contribution

It introduces a novel interpretation of the Schr"odinger-Robertson inequality in relativistic phase space using Born reciprocity and characterizes semiclassical limits via the quaplectic group's orbit structure.

Findings

Semiclassical limits relate to space-time and matter emergence.

The quaplectic group governs the invariance and orbit structure.

Relativistic oscillators and squeezed states exemplify the theory.

Abstract

The Schr\"odinger-Robertson inequality for relativistic position and momentum operators X^\mu, P_\nu, \mu, \nu = 0,1,2,3, is interpreted in terms of Born reciprocity and `non-commutative' relativistic phase space geometry. For states which saturate the Schr\"odinger-Robertson inequality, a typology of semiclassical limits is pointed out, characterised by the orbit structure within its unitary irreducible representations, of the full invariance group of Born reciprocity, the so-called `quaplectic' group U(3,1)xH(3,1) (the semi-direct product of the unitary relativistic dyamical symmetry U(3,1) with the Weyl-Heisenberg group H(3,1)). The example of the `scalar' case, namely the relativistic oscillator, and associated multimode squeezed states, is treated in detail. In this case,it is suggested that the semiclassical limit corresponds to the separate emergence of space-time and matter, in the form of the stress-energy tensor, and the quadrupole tensor, which are in general reciprocally equivalent.