It is shown that the actual paths in Hilbert space followed by a finite set of n ⩾ 2 quantum states evolving between initial and final end point configurations are such that an associated weak energy functional defined by Pancharatnam phases and state separation distances in projective Hilbert space determined by the generalized Fubini-Study metric is stationary for all variations of these phases, separations and time which vanish at the end points. Noether's theorem is used to identify two weak energy conservation laws which are shown to be the analogues of the momentum and energy conservation laws of Langrangian mechanics.
It is shown that the actual paths in Hilbert space followed by a finite set of n ⩾ 2 quantum states evolving between initial and final end point configurations are such that an associated weak energy functional defined by Pancharatnam phases and state separation distances in projective Hilbert space determined by the generalized Fubini-Study metric is stationary for all variations of these phases, separations and time which vanish at the end points. Noether's theorem is used to identify two weak energy conservation laws which are shown to be the analogues of the momentum and energy conservation laws of Langrangian mechanics.
The weak energy for a quantum state evolving relative to its fixed initial state (pointed weak energy) in a Hilbert space of arbitrary dimension is defined and aspects of the classical mechanical, transformational and geometric relationships between this quantity and the motion of the associated quantum state are studied in a two-dimensional configuration space with Pancharatnam (P) phase and Fubini-Study (FS) metric distance as generalized coordinates (PFS configuration space). It is shown that when expressed in these coordinates: (1) the evolution of the quantum state is described by an equation of motion for an associated correlation amplitude (pointed correlation amplitude) in which the dynamics are induced by the interaction of the pointed weak energy with this correlation amplitude; (2) the pointed weak energy defines a 1-form with the transformational properties of a U (1) gauge potential (pointed weak energy gauge potential) which produces infinitesimal changes in the pointed correlation amplitude via its interaction with the amplitude; (3) the pointed correlation amplitude is defined by an exponential function of a line integral of the pointed weak energy gauge potential; (4) pointed weak energy gauge transformations exist that are equivalent to local U (1) gauge transformations of quantum states and—when examined within the context of the pointed probability current and pointed weak energy stationary action principles—offer an interpretation of gauge invariance analogous to that found in classical mechanics; and (5) integral invariants exist which relate line integrals of the weak energy gauge potential to geometric phase and the Aharonov–Anandan connection 1-form in the associated Hilbert space. States which irreversibly decay and Grover's quantum search algorithm serve as simple illustrations of the theory.
The equation of motion for a time-dependent weak value of a quantum-mechanical observable is known to contain a complex valued energy factor (the weak energy of evolution) that is defined by the dynamics of the pre-selected and post-selected states which specify the observable's weak value. In this paper, the mechanism responsible for the creation of this energy is identified and it is shown that the cumulative effect over time of this energy is manifested as dynamical phases and pure geometric phases (the intrinsic phases of evolution) which govern the evolution of the weak value during its measurement process. These phases are simply related to a Pancharatnam phase and Fubini–Study metric distance defined by the Hilbert space evolution of the associated pre-selected and post-selected states. A characterization of time-dependent weak value evolution as Pancharatnam phase angle rotations and Fubini–Study distance scalings of a vector in the Argand plane is discussed as an application of this relationship. The theory of weak values is also reviewed and simple ‘gedanken experiments’ are used to illustrate both the time-independent and the time-dependent versions of the theory. It is noted that the direct experimental observation of the weak energy of evolution would strongly support the time-symmetric paradigm of quantum mechanics and it is suggested that weak value equations of motion represent a new category of nonlocal equations of motion.
This short note proposes that the conserved substance of physics is action, not energy. Energy conservation is, by Noether's theorem, the exact statement of a uniform flow of time — an assumption that fails, even if only slightly, in a relativistic universe where clocks run at different rates in different places. Read the other way, Planck's relation becomes a conservation law rather than an empirical input: Eτ = h, one quantum of action processed per cycle of a local resonance, with ordinary energy conservation recovered as the special case in which the period τ is held fixed. The note carries exactly one assumption beyond the algebra, stated plainly rather than smuggled in: the vacuum is a medium of such resonances, and a particle is a persistent, self-closing cycle within it. Angle and capacity The invariant has two faces. The law pins the magnitude at h — the capacity — leaving the accumulated phase φ as the only freedom: dS = ℏ dφ. Every familiar conjugate pair is this one statement read along a different axis of advance — energy against time, momentum against position, angular momentum against orientation — three orthogonal accounts of one accumulating phase, each closing one unit of capacity per cycle: Eτ = h, pλ = h, L·2π = h. This split is where classical and quantum mechanics part ways. An open trajectory reads the phase continuously, and its stationary-phase condition is the principle of least action; a closed resonance can only count whole turns, and closure quantises. Quantisation is a property of closure, not a property of the phase — the boundary between classical and quantum is a change of topology, not a change of law. What follows mechanically From the capacity law alone, with no further postulate, three familiar structures are recovered. A resonance at rest turns at the Compton frequency ωC = mc²/ℏ, so that one full turn spends exactly one quantum, EτC = h: mass is nothing but a resonance's cycling rate. Driven through the medium, a resonance meets an increased flux that scales as the Lorentz factor; conserving its fixed action budget under that load forces its geometry to yield — contraction along the direction of motion, dilation of its internal period — recovering special relativity as mechanical equilibration rather than a postulate about coordinates, with no rest frame ever exposed because the same yielding that would reveal one also defines the observer's own rulers and clocks. Requiring the accumulated phase along a worldline to stay coherent, expanded in the weak-field limit, returns the classical Lagrangian directly, −Mc²dτ = (T − V − Mc²)dt: least action is not minimised as a primitive rule, it is what capacity conservation looks like when a resonance crosses a gradient of the medium. And the Heisenberg relation σxσp ≥ ℏ/2 is read as the ordinary bandwidth (Gabor) theorem for a wave and its Fourier transform — a floor on occupancy for a phase-locked resonance, not a ceiling on knowledge. Gravity, without a graviton The most interpretive claim in the note, flagged as such throughout: if the metric's invariant is Eτ = h rather than a fixed energy, the metric carries no absolute clock, and the phase-lock condition forces its temporal and spatial responses to be reciprocal, giving the bipolar exponential line element ds² = −e−2ξc²dt² + e+2ξdx². The conceptual point is what this reframes: the decades-long search for a quantum theory of gravity has sought a graviton by quantising the metric on a fixed background, when gravity is the background. On this reading there is no separate field to quantise — the medium's deformation is already quantised at h per cycle, and gravity is simply the shape of phase accumulation across its gradient. The problem is not solved so much as dissolved: relocated from “how do we quantise the metric” to “the metric was never a separate thing to quantise.” Scope The note is deliberately bounded, and says so explicitly rather than leaving the boundary implicit. It derives special relativity, the principle of least action, and the bandwidth reading of the uncertainty relation from the capacity law alone; it advances the gravitational reading as a stance to be tested against its consequences, not a completed theory. It does not derive the particle spectrum, specific masses, electric charge, colour, or the numerical values of G or α, and makes no cosmological claim. This separation is intentional: a conservation principle should be judged on its own terms. A companion note reports a closed-form numerical identity for the proton mass as a separate, independent empirical fact; the two are meant to be read, and to stand or fall, apart.
This short note proposes that the conserved substance of physics is action, not energy. Energy conservation is, by Noether's theorem, the exact statement of a uniform flow of time — an assumption that fails, even if only slightly, in a relativistic universe where clocks run at different rates in different places. Read the other way, Planck's relation becomes a conservation law rather than an empirical input: Eτ = h, one quantum of action processed per cycle of a local resonance, with ordinary energy conservation recovered as the special case in which the period τ is held fixed. The note carries exactly one assumption beyond the algebra, stated plainly rather than smuggled in: the vacuum is a medium of such resonances, and a particle is a persistent, self-closing cycle within it. Angle and capacity The invariant has two faces. The law pins the magnitude at h — the capacity — leaving the accumulated phase φ as the only freedom: dS = ℏ dφ. Every familiar conjugate pair is this one statement read along a different axis of advance — energy against time, momentum against position, angular momentum against orientation — three orthogonal accounts of one accumulating phase, each closing one unit of capacity per cycle: Eτ = h, pλ = h, L·2π = h. This split is where classical and quantum mechanics part ways. An open trajectory reads the phase continuously, and its stationary-phase condition is the principle of least action; a closed resonance can only count whole turns, and closure quantises. Quantisation is a property of closure, not a property of the phase — the boundary between classical and quantum is a change of topology, not a change of law. What follows mechanically From the capacity law alone, with no further postulate, three familiar structures are recovered. A resonance at rest turns at the Compton frequency ωC = mc²/ℏ, so that one full turn spends exactly one quantum, EτC = h: mass is nothing but a resonance's cycling rate. Driven through the medium, a resonance meets an increased flux that scales as the Lorentz factor; conserving its fixed action budget under that load forces its geometry to yield — contraction along the direction of motion, dilation of its internal period — recovering special relativity as mechanical equilibration rather than a postulate about coordinates, with no rest frame ever exposed because the same yielding that would reveal one also defines the observer's own rulers and clocks. Requiring the accumulated phase along a worldline to stay coherent, expanded in the weak-field limit, returns the classical Lagrangian directly, −Mc²dτ = (T − V − Mc²)dt: least action is not minimised as a primitive rule, it is what capacity conservation looks like when a resonance crosses a gradient of the medium. And the Heisenberg relation σxσp ≥ ℏ/2 is read as the ordinary bandwidth (Gabor) theorem for a wave and its Fourier transform — a floor on occupancy for a phase-locked resonance, not a ceiling on knowledge. Gravity, without a graviton The most interpretive claim in the note, flagged as such throughout: if the metric's invariant is Eτ = h rather than a fixed energy, the metric carries no absolute clock, and the phase-lock condition forces its temporal and spatial responses to be reciprocal, giving the bipolar exponential line element ds² = −e−2ξc²dt² + e+2ξdx². The conceptual point is what this reframes: the decades-long search for a quantum theory of gravity has sought a graviton by quantising the metric on a fixed background, when gravity is the background. On this reading there is no separate field to quantise — the medium's deformation is already quantised at h per cycle, and gravity is simply the shape of phase accumulation across its gradient. The problem is not solved so much as dissolved: relocated from “how do we quantise the metric” to “the metric was never a separate thing to quantise.” Scope The note is deliberately bounded, and says so explicitly rather than leaving the boundary implicit. It derives special relativity, the principle of least action, and the bandwidth reading of the uncertainty relation from the capacity law alone; it advances the gravitational reading as a stance to be tested against its consequences, not a completed theory. It does not derive the particle spectrum, specific masses, electric charge, colour, or the numerical values of G or α, and makes no cosmological claim. This separation is intentional: a conservation principle should be judged on its own terms. A companion note reports a closed-form numerical identity for the proton mass as a separate, independent empirical fact; the two are meant to be read, and to stand or fall, apart.
Noether’s theorem on constants of the motion of dynamical systems has recently been extended to classical dissipative systems (Markovian semi-groups) by Baez and Fong [J. Math. Phys. 54, 013301 (2013)]. We show how to extend these results to the fully quantum setting of quantum Markov dynamics. For finite-dimensional Hilbert spaces, we construct a mapping from observables to completely positive maps that leads to the natural analogue of their criterion of commutativity with the infinitesimal generator of the Markov dynamics. Using standard results on the relaxation of states to equilibrium under quantum dynamical semi-groups, we are able to characterise the constants of the motion under quantum Markov evolutions in the infinite-dimensional setting under the usual assumption of existence of a stationary strictly positive density matrix. In particular, the Noether constants are identified with the fixed point of the Heisenberg picture semi-group.