An Information-Theoretic Link Between Spacetime Symmetries and Quantum Linearity

TL;DR

This paper introduces a nonlinear, information-theoretic generalization of quantum mechanics that links spacetime symmetries with quantum linearity, suggesting both may be emergent properties influenced by an intrinsic length scale.

Contribution

It presents a novel nonlinear quantum equation derived from information theory, showing how spacetime symmetries and linearity can emerge from a parameter tuning, with implications for fundamental physics.

Findings

Nonlinear quantum equations involve derivatives to all orders and are mildly nonlocal.

Spacetime symmetries are recovered when a dimensionless parameter vanishes.

Potential relevance to neutrino mass and oscillations, hinting at hidden symmetries.

Abstract

A nonlinear generalisation of Schrodinger's equation is obtained using information-theoretic arguments. The nonlinearities are controlled by an intrinsic length scale and involve derivatives to all orders thus making the equation mildly nonlocal. The nonlinear equation is homogeneous, separable, conserves probability, but is not invariant under spacetime symmetries. Spacetime symmetries are recovered when a dimensionless parameter is tuned to vanish, whereby linearity is simultaneously established and the length scale becomes hidden. It is thus suggested that if, in the search for a more basic foundation for Nature's Laws, an inference principle is given precedence over symmetry requirements, then the symmetries of spacetime and the linearity of quantum theory might both be emergent properties that are intrinsically linked. Supporting arguments are provided for this point of view and some testable phenomenological consequences highlighted. The generalised Klien-Gordon and Dirac equations are also studied, leading to the suggestion that nonlinear quantum dynamics with intrinsically broken spacetime symmetries might be relevant to understanding the problem of neutrino mass(lessness) and oscillations: Among other observations, this approach hints at the existence of a hidden discrete family symmetry in the Standard Model of particle physics.