Indefinite probabilities in quantum spacetime: A deepening of unpredictability

Non-commutative spacetime and quantum groups have been argued to capture non-classical features of spacetime and its symmetries in the low-energy limit of quantum gravity. In this letter, we show that employing the $SU_q(2)$ quantum group to describe rotational symmetry for spin-$\frac{1}{2}$ systems and Stern-Gerlach apparatuses leads to the description of probabilities of outcomes of spin measurements in terms of non-commuting operators. As a result, we obtain an uncertainty principle between different probability operators, realizing a notion of indefinite probabilities. This is then reflected in the non-commutativity of the entries of the rotation matrix relating the reference frames of two observers, hence fundamentally preventing them from sharply measuring their relative orientation.

Source: arXiv:2605.23862v1 - http://arxiv.org/abs/2605.23862v1 PDF: https://arxiv.org/pdf/2605.23862v1 Original Link: http://arxiv.org/abs/2605.23862v1