approacharrowbarbourbohmianbundlecausalclassclassicalconstraintscontentdualitiesdynamicseinsteinemergencefeynmanfiberfieldfirstgeneralgravityhamiltonianhappenhiggsinertiajustlagrangianlocalitymassivemechanicsmillsobservablesonticontologyphysicalqbismquantizationquantumrealismreductionrelativisticrelativityscientificshapespacespacetimesplitstringstructuretheoriestheorytimetimelesswayyang