The title has changed because the objective has also changed. The purpose of earlier versions was to clarify Einstein’s intent when he formulated his quantum theory of radiation: why choose statistical methods to derive Planck’s law, why emphasize momentum, and why are both important to a “final theory”. We find that Einstein’s methods have the common property that they are formulated statistically in continuous space and time. It means that the problem of the quantum-classical divide does not exist in any of his theories, and that his results are fully consistent in the presence of non-linear gravitational fields. To see if his unconventional methods can provide the insights necessary to resolve the long-standing problem of wave function collapse we will compare how the two versions interpret causality. We show that Gödel’s incompleteness theorem is key to resolving wave function collapse.
The title has changed because the objective has also changed. The purpose of earlier versions was to clarify Einstein’s intent when he formulated his quantum theory of radiation: why choose statistical methods to derive Planck’s law, why emphasize momentum, and why are both important to a “final theory”. We find that Einstein’s methods have the common property that they are formulated statistically in continuous space and time. It means that the problem of the quantum-classical divide does not exist in any of his theories, and that his results are fully consistent in the presence of non-linear gravitational fields. To see if his unconventional methods can provide the insights necessary to resolve the long-standing problem of wave function collapse we will compare how the two versions interpret causality. We show that Gödel’s incompleteness theorem is key to resolving wave function collapse.
The title has changed because the objective has also changed. The purpose of earlier versions was to clarify Einstein’s intent when he formulated his quantum theory of radiation: why choose statistical methods to derive Planck’s law, why emphasize momentum, and why are both important to a “final theory”. We find that Einstein’s methods have the common property that they are formulated in continuous space and time. It means that the problem of the quantum-classical divide does not exist in any of his theories, and that his results are fully consistent in the presence of non-linear gravitational fields. To see if his unconventional methods can provide the insights necessary to resolve the long-standing problem of wave function collapse we will compare how the two versions interpret causality. We show that Gödel’s incompleteness theorem is key to a reinterpretation of wave function collapse.
We present an ontological and dynamic derivation of wave function collapse within the context of General Relativity formulated as a Quantum Theory (GRQT), a formulation that maintains ontological realism and conceptual continuity with General Relativity. Starting exclusively from the discrete geometric structure of spacetime and its fundamental elastic properties, we demonstrate that collapse constitutes neither an additional postulate of quantum mechanics nor an external phenomenological effect, but emerges as a necessary consequence of the requirement for geometric consistency in the temporal update of the causal lattice. We show that quantum superpositions of massive systems imply geometric bifurcations of spacetime, associated with incompatible metrics in the transition between successive simultaneity slices. The energy identified in Objective Reduction theories as gravitational self-interaction energy is reinterpreted, in GRQT, as the elastic deformation energy of the lattice, governed by the fundamental geometric impedance α. We derive a quantitative criterion for the viability of temporal evolution and a closed-form expression for the characteristic collapse time, without introducing free parameters. Wave function collapse thus arises as the physical process by which spacetime eliminates geometric ambiguities incompatible with the unique definition of the subsequent slice, preserving the topological continuity of the causal manifold. The boundary between quantum and classical regimes becomes quantitative and derived, resolving the measurement problem in strictly geometric terms. The formulation maintains ontological realism, conceptual continuity with General Relativity, and provides explicit experimental predictions in mesoscopic regimes.
We investigate the meaning of the wave function by analyzing the mass and charge density distributions of a quantum system. According to protective measurement, a charged quantum system has effective mass and charge density distributing in space, proportional to the square of the absolute value of its wave function. In a realistic interpretation, the wave function of a quantum system can be taken as a description of either a physical field or the ergodic motion of a particle. The essential difference between a field and the ergodic motion of a particle lies in the property of simultaneity; a field exists throughout space simultaneously, whereas the ergodic motion of a particle exists throughout space in a time‐divided way. If the wave function is a physical field, then the mass and charge density will be distributed in space simultaneously for a charged quantum system, and thus there will exist gravitational and electrostatic self‐interactions of its wave function. This not only violates the superposition principle of quantum mechanics but also contradicts experimental observations. Thus the wave function cannot be a description of a physical field but be a description of the ergodic motion of a particle. For the later there is only a localized particle with mass and charge at every instant, and thus there will not exist any self‐interaction for the wave function. It is further argued that the classical ergodic models, which assume continuous motion of particles, cannot be consistent with quantum mechanics. Based on the negative result, we suggest that the wave function is a description of the quantum motion of particles, which is random and discontinuous in nature. On this interpretation, the square of the absolute value of the wave function not only gives the probability of the particle being found in certain locations, but also gives the probability of the particle being there. The suggested new interpretation of the wave function provides a natural realistic alternative to the orthodox interpretation, and it also implies that the de Broglie‐Bohm theory and many‐worlds interpretation are wrong and the dynamical collapse theories are in the right direction by admitting wavefunction collapse.
This is an account of Einstein's work and thoughts on the quantum theory. The following topics will be discussed: The light-quantum hypothesis and its gradual evolution into the photon concept. Early history of the photoelectric effect. The theoretical and experimental reasons why the resistance to the photon was stronger and more protracted than for any other particle proposed to date. Einstein's position regarding the Bohr-Kramers-Slater suggestion, the last bastion of resistance to the photon. Einstein's analysis of fluctuations around thermal equilibrium and his proposal of a duality between particles and waves, in 1909 for electromagnetic radiation (the first time this duality was ever stated) and in January 1925 for matter (prior to quantum mechanics and for reasons independent of those given earlier by de Broglie). His demonstration that long-known specific heat anomalies are quantum effects. His role in the evolution of the third law of thermodynamics. His new derivation of Planck's law in 1917 which also marks the beginning of his concern with the failure of classical causality. His role as one of the founders of quantum statistics and his discovery of the first example of a phase transition derived by using purely statistical methods. His position as a critic of quantum mechanics. Initial doubts on the consistency of quantum mechanics (1926-1930). His view maintained from 1930 until the end of his life: quantum mechanics is logically consistent and quite successful but it is incomplete. His attitude toward success. His criterion of objective reality. Differences in the roles relativity and quantum theory played in Einstein's life. His vision regarding quantum theory in the context of a unified field theory. His last autobiographical sketch, written a few months before his death, concluding with a statement about the quantum theory, a subject to which (by his own account) he had given more thought than even to general relativity.
Collapse models possibly suggest the need for a better understanding of the structure of space-time. We argue that physical space, and space-time, are emergent features of the Universe, which arise as a result of dynamical collapse of the wave function. The starting point for this argument is the observation that classical time is external to quantum theory, and there ought to exist an equivalent reformulation which does not refer to classical time. We propose such a reformulation, based on a non-commutative special relativity. In the spirit of Trace Dynamics, the reformulation is arrived at, as a statistical thermodynamics of an underlying classical dynamics in which matter and non-commuting space-time degrees of freedom are matrices obeying arbitrary commutation relations. Inevitable statistical fluctuations around equilibrium can explain the emergence of classical matter fields and classical space-time, in the limit in which the universe is dominated by macroscopic objects. The underlying non-commutative structure of space-time also helps understand better the peculiar nature of quantum non-locality, where the effect of wave-function collapse in entangled systems is felt across space-like separations.
This is the first single volume about the collapse theories of quantum mechanics, which is becoming a very active field of research in both physics and philosophy. In standard quantum mechanics, it is postulated that when the wave function of a quantum system is measured, it no longer follows the Schrödinger equation, but instantaneously and randomly collapses to one of the wave functions that correspond to definite measurement results. However, why and how a definite measurement result appears is unknown. A promising solution to this problem are collapse theories in which the collapse of the wave function is spontaneous and dynamical. Chapters written by distinguished physicists and philosophers of physics discuss the origin and implications of wave-function collapse, the controversies around collapse models and their ontologies, and new arguments for the reality of wave function collapse. This is an invaluable resource for students and researchers interested in the philosophy of physics and foundations of quantum mechanics.