Quantum potential
The quantum potential or quantum potentiality is a central concept of the de Broglie–Bohm formulation of quantum mechanics, introduced by David Bohm in 1952.
Initially presented under the name quantum-mechanical potential, subsequently quantum potential, it was later elaborated upon by Bohm and Basil Hiley in its interpretation as an information potential which acts on a quantum particle. It is also referred to as quantum potential energy, Bohm potential, quantum Bohm potential or Bohm quantum potential.
Quantum potential |
In the framework of the de Broglie–Bohm theory, the quantum potential is a term within the
The Bohm quantum potential is closely linked with the results of other approaches, in particular relating to work by Erwin Madelung of 1927 and to work by Carl Friedrich von Weizsäcker of 1935.
Building on the interpretation of the quantum theory introduced by Bohm in 1952, David Bohm and Basil Hiley in 1975 presented how the concept of a quantum potential leads to the notion of an "unbroken wholeness of the entire universe", proposing that the fundamental new quality introduced by quantum physics is nonlocality.[3]
Quantum potential as part of the Schrödinger equation
is re-written using the polar form for the wave function with real-valued functions and , where is the amplitude (absolute value) of the wave function , and its phase. This yields two equations: from the imaginary and real part of the Schrödinger equation follow the continuity equation and the quantum Hamilton–Jacobi equation respectively.[1][4]
Continuity equation
The imaginary part of the Schrödinger equation in polar form yields
which, provided , can be interpreted as the continuity equation for the probability density and the velocity field
Quantum Hamilton–Jacobi equation
The real part of the Schrödinger equation in polar form yields a modified Hamilton–Jacobi equation
also referred to as quantum Hamilton–Jacobi equation.[5] It differs from the classical Hamilton–Jacobi equation only by the term
This term , called quantum potential, thus depends on the curvature of the amplitude of the wave function.[6][7]
In the limit , the function is a solution of the (classical) Hamilton–Jacobi equation;[1] therefore, the function is also called the Hamilton–Jacobi function, or action, extended to quantum physics.
Properties
Hiley emphasised several aspects[8] that regard the quantum potential of a quantum particle:
- it is derived mathematically from the real part of the Schrödinger equation under polar decomposition of the wave function,[9] is not derived from a Hamiltonian[10] or other external source, and could be said to be involved in a self-organising process involving a basic underlying field;
- it does not change if is multiplied by a constant, as this term is also present in the denominator, so that is independent of the magnitude of and thus of field intensity; therefore, the quantum potential fulfils a precondition for nonlocality: it need not fall off as distance increases;
- it carries information about the whole experimental arrangement in which the particle finds itself.
In 1979, Hiley and his co-workers Philippidis and Dewdney presented a full calculation on the explanation of the
Also the shift of the interference pattern which occurs in presence of a magnetic field in the Aharonov–Bohm effect could be explained as arising from the quantum potential.[12]
Relation to the measurement process
The collapse of the wave function of the Copenhagen interpretation of quantum theory is explained in the quantum potential approach by the demonstration that, after a measurement, "all the packets of the multi-dimensional wave function that do not correspond to the actual result of measurement have no effect on the particle" from then on.[13] Bohm and Hiley pointed out that
- ‘the quantum potential can develop unstable bifurcation points, which separate classes of particle trajectories according to the "channels" into which they eventually enter and within which they stay. This explains how measurement is possible without "collapse" of the wave function, and how all sorts of quantum processes, such as transitions between states, fusion of two states into one and fission of one system into two, are able to take place without the need for a human observer.’[14]
Measurement then "involves a participatory transformation in which both the system under observation and the observing apparatus undergo a mutual participation so that the trajectories behave in a correlated manner, becoming correlated and separated into different, non-overlapping sets (which we call ‘channels’)".[15]
Quantum potential of an n-particle system
The Schrödinger wave function of a many-particle quantum system cannot be represented in ordinary three-dimensional space. Rather, it is represented in configuration space, with three dimensions per particle. A single point in configuration space thus represents the configuration of the entire n-particle system as a whole.
A two-particle wave function of identical particles of mass has the quantum potential[16]
where and refer to particle 1 and particle 2 respectively. This expression generalizes in straightforward manner to particles:
In case the wave function of two or more particles is separable, then the system's total quantum potential becomes the sum of the quantum potentials of the two particles. Exact separability is extremely unphysical given that interactions between the system and its environment destroy the factorization; however, a wave function that is a superposition of several wave functions of approximately disjoint support will factorize approximately.[17]
Derivation for a separable quantum system
That the wave function is separable means that factorizes in the form . Then it follows that also factorizes, and the system's total quantum potential becomes the sum of the quantum potentials of the two particles.[18]
In case the wave function is separable, that is, if factorizes in the form , the two one-particle systems behave independently. More generally, the quantum potential of an -particle system with separable wave function is the sum of quantum potentials, separating the system into independent one-particle systems.[19]
Formulation in terms of probability density
Quantum potential in terms of the probability density function
Bohm, as well as other physicists after him, have sought to provide evidence that the Born rule linking to the probability density function
can be understood, in a pilot wave formulation, as not representing a basic law, but rather a theorem (called
the quantum potential, expressed in terms of the probability density function, becomes:[20]
Quantum force
The quantum force , expressed in terms of the probability distribution, amounts to:[21]
Formulation in configuration space and in momentum space, as the result of projections
M. R. Brown and B. Hiley showed that, as alternative to its formulation terms of configuration space (-space), the quantum potential can also be formulated in terms of
In line with David Bohm's approach, Basil Hiley and mathematician
The approach has been applied to extended phase space,[30][31] also in terms of a Duffin–Kemmer–Petiau algebra approach.[32][33]
Relation to other quantities and theories
Relation to the Fisher information
It can be shown[34] that the mean value of the quantum potential is proportional to the probability density's Fisher information about the observable
Using this definition for the Fisher information, we can write:[35]
Relation to the Madelung pressure tensor
In the Madelung equations presented by Erwin Madelung in 1927, the non-local quantum pressure tensor has the same mathematical form as the quantum potential. The underlying theory is different in that the Bohm approach describes particle trajectories whereas the equations of Madelung quantum hydrodynamics are the Euler equations of a fluid that describe its averaged statistical characteristics.[36]
Relation to the von Weizsäcker correction
In 1935,[37] Carl Friedrich von Weizsäcker proposed the addition of an inhomogeneity term (sometimes referred to as a von Weizsäcker correction) to the kinetic energy of the Thomas–Fermi (TF) theory of atoms.[38]
The von Weizsäcker correction term is[39]
The correction term has also been derived as the first-order correction to the TF kinetic energy in a semi-classical correction to the Hartree–Fock theory.[40]
It has been pointed out[39] that the von Weizsäcker correction term at low density takes on the same form as the quantum potential.
Quantum potential as energy of internal motion associated with spin
Giovanni Salesi, Erasmo Recami and co-workers showed in 1998 that, in agreement with the
from which the second term is shown to be of negligible size; then with it follows that
Salesi gave further details on this work in 2009.[42]
In 1999, Salvatore Esposito generalized their result from spin-½ particles to particles of arbitrary spin, confirming the interpretation of the quantum potential as a kinetic energy for an internal motion. Esposito showed that (using the notation =1) the quantum potential can be written as:[43]
and that the causal interpretation of quantum mechanics can be reformulated in terms of a particle velocity
where the "drift velocity" is
and the "relative velocity" is , with
and representing the spin direction of the particle. In this formulation, according to Esposito, quantum mechanics must necessarily be interpreted in probabilistic terms, for the reason that a system's initial motion condition cannot be exactly determined.[43] Esposito explained that "the quantum effects present in the Schrödinger equation are due to the presence of a peculiar spatial direction associated with the particle that, assuming the isotropy of space, can be identified with the spin of the particle itself".[44] Esposito generalized it from matter particles to gauge particles, in particular photons, for which he showed that, if modelled as , with probability function , they can be understood in a quantum potential approach.[45]
James R. Bogan, in 2002, published the derivation of a reciprocal transformation from the Hamilton-Jacobi equation of classical mechanics to the time-dependent Schrödinger equation of quantum mechanics which arises from a
EP quantum mechanics with quantum potential as Schwarzian derivative
In a different approach, the EP quantum mechanics formulated on the basis of an Equivalence Principle (EP), a quantum potential is written as:[47][48]
where is the Schwarzian derivative, that is, . However, even in cases where this may equal
it is stressed by E. Faraggi and M. Matone that this does not correspond with the usual quantum potential, as in their approach is a solution to the Schrödinger equation but does not correspond to the wave function.[47] This has been investigated further by E.R. Floyd for the classical limit ,[49] as well as by Robert Carroll.[50]
Re-interpretation in terms of Clifford algebras
B. Hiley and R. E. Callaghan re-interpret the role of the Bohm model and its notion of quantum potential in the framework of Clifford algebra, taking account of recent advances that include the work of David Hestenes on spacetime algebra. They show how, within a nested hierarchy of Clifford algebras , for each Clifford algebra an element of a minimal left ideal and an element of a
Relativistic and field-theoretic extensions
Quantum potential and relativity
Bohm and Hiley demonstrated that the non-locality of quantum theory can be understood as limit case of a purely local theory, provided the transmission of active information is allowed to be greater than the speed of light, and that this limit case yields approximations to both quantum theory and relativity.[55]
The quantum potential approach was extended by Hiley and co-workers to quantum field theory in Minkowski spacetime[56][57][58][59] and to curved spacetime.[60]
Carlo Castro and Jorge Mahecha derived the Schrödinger equation from the Hamilton-Jacobi equation in conjunction with the continuity equation, and showed that the properties of the relativistic Bohm quantum potential in terms of the ensemble density can be described by the Weyl properties of space. In Riemann flat space, the Bohm potential is shown to equal the
and the quantum force exerted by the relativistic quantum potential is shown to depend on the Weyl gauge potential and its derivatives. Furthermore, the relationship among Bohm's potential and the Weyl curvature in flat spacetime corresponds to a similar relationship among Fisher Information and Weyl geometry after introduction of a complex momentum.[61]
Diego L. Rapoport, on the other hand, associates the relativistic quantum potential with the metric scalar curvature (Riemann curvature).[62]
In relation to the Klein–Gordon equation for a particle with mass and charge, Peter R. Holland spoke in his book of 1993 of a ‘quantum potential-like term’ that is proportional . He emphasized however that to give the Klein–Gordon theory a single-particle interpretation in terms of trajectories, as can be done for nonrelativistic Schrödinger quantum mechanics, would lead to unacceptable inconsistencies. For instance, wave functions that are solutions to the Klein–Gordon or the Dirac equation cannot be interpreted as the probability amplitude for a particle to be found in a given volume at time in accordance with the usual axioms of quantum mechanics, and similarly in the causal interpretation it cannot be interpreted as the probability for the particle to be in that volume at that time. Holland pointed out that, while efforts have been made to determine a Hermitian position operator that would allow an interpretation of configuration space quantum field theory, in particular using the Newton–Wigner localization approach, but that no connection with possibilities for an empirical determination of position in terms of a relativistic measurement theory or for a trajectory interpretation has so far been established. Yet according to Holland this does not mean that the trajectory concept is to be discarded from considerations of relativistic quantum mechanics.[63]
Hrvoje Nikolić derived as expression for the quantum potential, and he proposed a Lorentz-covariant formulation of the Bohmian interpretation of many-particle wave functions.[64] He also developed a generalized relativistic-invariant probabilistic interpretation of quantum theory,[65][66][67] in which is no longer a probability density in space but a probability density in space-time.[68][69]
Quantum potential in quantum field theory
Starting from the space representation of the field coordinate, a causal interpretation of the Schrödinger picture of relativistic quantum theory has been constructed. The Schrödinger picture for a neutral, spin 0, massless field , with real-valued functionals, can be shown[70] to lead to
This has been called the superquantum potential by Bohm and his co-workers.[71]
Basil Hiley showed that the energy–momentum-relations in the Bohm model can be obtained directly from the
Interpretation and naming of the quantum potential
In his article of 1952, providing an alternative
Bohm and Basil Hiley also called the quantum potential an information potential, given that it influences the form of processes and is itself shaped by the environment.[10] Bohm indicated "The ship or aeroplane (with its automatic Pilot) is a self-active system, i.e. it has its own energy. But the form of its activity is determined by the information content concerning its environment that is carried by the radar waves. This is independent of the intensity of the waves. We can similarly regard the quantum potential as containing active information. It is potentially active everywhere, but actually active only where and when there is a particle." (italics in original).[75]
Hiley refers to the quantum potential as internal energy[25] and as "a new quality of energy only playing a role in quantum processes".[76] He explains that the quantum potential is a further energy term aside the well-known kinetic energy and the (classical) potential energy and that it is a nonlocal energy term that arises necessarily in view of the requirement of energy conservation; he added that much of the physics community's resistance against the notion of the quantum potential may have been due to scientists' expectations that energy should be local.[77]
Hiley has emphasized that the quantum potential, for Bohm, was "a key element in gaining insights into what could underlie the quantum formalism. Bohm was convinced by his deeper analysis of this aspect of the approach that the theory could not be mechanical. Rather, it is organic in the sense of Whitehead. Namely, that it was the whole that determined the properties of the individual particles and their relationship, not the other way round."[78][79]
Peter R. Holland, in his comprehensive textbook, also refers to it as quantum potential energy.[80] The quantum potential is also referred to in association with Bohm's name as Bohm potential, quantum Bohm potential or Bohm quantum potential.
Applications
The quantum potential approach can be used to model quantum effects without requiring the Schrödinger equation to be explicitly solved, and it can be integrated in simulations, such as Monte Carlo simulations using the hydrodynamic and drift diffusion equations.[81] This is done in form of a "hydrodynamic" calculation of trajectories: starting from the density at each "fluid element", the acceleration of each "fluid element" is computed from the gradient of and , and the resulting divergence of the velocity field determines the change to the density.[82]
The approach using Bohmian trajectories and the quantum potential is used for calculating properties of quantum systems which cannot be solved exactly, which are often approximated using semi-classical approaches. Whereas in
The expression for the quantum force has been used, together with Bayesian statistical analysis and Expectation-maximisation methods, for computing ensembles of trajectories that arise under the influence of classical and quantum forces.[21]
Further reading
Fundamental articles
- Bohm, David (1952). "A Suggested Interpretation of the Quantum Theory in Terms of "Hidden Variables" I". Physical Review. 85 (2): 166–179. )
- Bohm, David (1952). "A Suggested Interpretation of the Quantum Theory in Terms of "Hidden Variables", II". Physical Review. 85 (2): 180–193. )
- D. Bohm, B. J. Hiley, P. N. Kaloyerou: An ontological basis for the quantum theory, Physics Reports (Review section of Physics Letters), volume 144, number 6, pp. 321–375, 1987 (full text), therein: D. Bohm, B. J. Hiley: I. Non-relativistic particle systems, pp. 321–348, and D. Bohm, B. J. Hiley, P. N. Kaloyerou: II. A causal interpretation of quantum fields, pp. 349–375
Recent articles
- Spontaneous creation of the universe from nothing, arXiv:1404.1207v1, 4 April 2014
- Maurice de Gosson, Basil Hiley: Short Time Quantum Propagator and Bohmian Trajectories, arXiv:1304.4771v1 (submitted 17 April 2013)
- Robert Carroll: Fluctuations, gravity, and the quantum potential, 13 January 2005, asXiv:gr-qc/0501045v1
Overview
- Davide Fiscaletti: About the Different Approaches to Bohm's Quantum Potential in Non-Relativistic Quantum Mechanics, Quantum Matter, Volume 3, Number 3, June 2014, pp. 177–199(23), .
- ISBN 978-3-319-00333-7(online)
- ISBN 0-521-48543-6paperback, transferred to digital printing 2004
- ISBN 0-415-06588-7
- David Bohm, ISBN 0-415-17182-2
References
- ^ )
- )
- )
- ISBN 0-415-06588-7, therein Chapter 3.1. The main points of the causal interpretation, p. 22–23.
- )
- ^ See for ex. Robert E. Wyatt, Eric R. Bittner: Quantum wave packet dynamics with trajectories: Implementation with adaptive Lagrangian grids of the amplitude of the wave function, Journal of Chemical Physics, vol. 113, no. 20, 22 November 2000, p. 8898 Archived 2011-10-02 at the Wayback Machine
- Pilot wave#Mathematical formulation for a single particle
- ^ B. J. Hiley: Active Information and Teleportation, p. 7; appeared in: Epistemological and Experimental Perspectives on Quantum Physics, D. Greenberger et al. (eds.), pages 113-126, Kluwer, Netherlands, 1999
- ^ B.J. Hiley: From the Heisenberg picture to Bohm: A New Perspective on Active Information and it Relation to Shannon Information, pp. 2 and 5. Published in: A. Khrennikov (ed.): Proc. Conf. Quantum Theory: reconsideration of foundations, pp. 141–162, Vaxjö University Press, Sweden, 2002
- ^ ISBN 90-272-5194-0, pp. 197-214, p. 207
- ^ Basil J. Hiley: The role of the quantum potential. In: G. Tarozzi, Alwyn Van der Merwe: Open questions in quantum physics: invited papers on the foundations of microphysics, Springer, 1985, pages 237 ff., therein page 239
- ^ D. Bohm, B. J. Hiley, P. N. Kaloyerou: An ontological basis for the quantum theory, Physics Reports (Review section of Physics Letters), volume 144, number 6, pp. 323–348, 1987 (abstract)
- ISBN 2-86332-169-2, p. 106
- ^ B. J. Hiley: Active Information and Teleportation, p. 10; appeared in: Epistemological and Experimental Perspectives on Quantum Physics, D. Greenberger et al. (eds.), pages 113-126, Kluwer, Netherlands, 1999
- ^ See for instance Detlef Dürr et al: Quantum equilibrium and the origin of absolute uncertainty, arXiv:quant-ph/0308039v1 6 August 2003, p. 23 ff.
- ISBN 0-415-06588-7, transferred to digital printing 2005, therein Chapter 4.1. The ontological interpretation of the many-body system, p. 59
- ^ D. Bohm, B. J. Hiley, P. N. Kaloyerou: An ontological basis for the quantum theory, Physics Reports (Review section of Physics Letters), volume 144, number 6, pp. 323–348, 1987 (p. 351, eq. (12)<--page=31 p. 351 is not(!) a typo-->
- ^ See for example the Introduction section of: Fernando Ogiba: Phenomenological derivation of the Schrödinger equation Archived 2011-10-11 at the Wayback Machine, Progress in Physics (indicated date: October 2011, but retrieved online earlier: July 31, 2011)
- ^ a b Jeremy B. Maddox, Eric R. Bittner: Estimating Bohm’s quantum force using Bayesian statistics Archived 2011-11-20 at the Wayback Machine, Journal of Chemical Physics, October 2003, vol. 119, no. 13, p. 6465–6474, therein p. 6472, eq.(38)
- ^ M. R. Brown: The quantum potential: the breakdown of classical symplectic symmetry and the energy of localisation and dispersion, arXiv.org (submitted on 6 Mar 1997, version of 5 Feb 2002, retrieved 24 July 2011) (abstract)
- ^ a b M. R. Brown, B. J. Hiley: Schrodinger revisited: an algebraic approach, arXiv.org (submitted 4 May 2000, version of 19 July 2004, retrieved June 3, 2011) (abstract)
- ISBN 1-86094-274-1
- ^ ISBN 3-540-22188-3, p. 299–324
- )
- ISBN 978-981-277-117-9, pp. 203–211, therein p. 204
- ^ Basil J. Hiley: Towards a Dynamics of Moments: The Role of Algebraic Deformation and Inequivalent Vacuum States, published in: Correlations ed. K. G. Bowden, Proc. ANPA 23, 104-134, 2001 (PDF)
- ^ B. J. Hiley, R. E. Callaghan: The Clifford Algebra approach to Quantum Mechanics A: The Schroedinger and Pauli Particles, arXiv.org (submitted on 17 Nov 2010 - abstract)
- ^ ISBN 978-981-277-117-9, p. 203–211, therein: p. 207 ff.
- ^ S. Nasiri: Quantum potential and symmetries in extended phase space, SIGMA 2 (2006), 062, quant-ph/0511125
- ^ M.C.B. Fernandes, J.D.M. Vianna: On the Duffin-Kemmer-Petiau algebra and the generalized phase space, Foundations of Physics, vol. 29, no. 2, 1999 (abstract)
- ^ M. Reginatto, Phys. Rev. A 58, 1775 (1998), cited after: Roumen Tsekov: Towards nonlinear quantum Fokker‐Planck equations, Int. J. Theor. Phys. 48 (2009) 1431–1435 (arXiv 0808.0326, p. 4).
- ISBN 981-4291-79-X, Chapter 1 Some quantum background, p. 1.
- ^ C. F. von Weizsäcker: Zur Theorie der Kernmassen, Zeitschrift für Physik, Volume 96, pp. 431–458 (1935).
- .
- ^ arXiv:0903.3644.
- .
- ^ G. Salesi, E. Recami, H. E. Hernández F., Luis C. Kretly: Hydrodynamics of spinning particles, submitted 15 February 1998, arXiv.org, arXiv:hep-th/9802106v1
- ^ G. Salesi: Spin and Madelung fluid, submitted 23 June 2009, arXiv:quant-ph/0906.4147v1
- ^ a b Salvatore Esposito: On the role of spin in quantum mechanics, submitted 5 February 1999, arXiv:quant-ph/9902019v1
- ^ p. 7
- ^ S. Esposito: Photon wave mechanics: A de Broglie–Bohm approach, p. 8 ff.
- ^ James R. Bogan: Spin: The classical to quantum connection, arXiv.org, submitted 19 December 2002, arXiv:quant-ph/0212110
- ^ a b Alon E. Faraggi, M. Matone: The Equivalence Postulate of Quantum Mechanics, International Journal of Modern Physics A, vol. 15, no. 13, pp. 1869–2017. arXiv hep-th/9809127 of 6 August 1999
- ^ Robert Carroll: Aspects of quantum groups and integrable systems, Proceedings of Institute of Mathematics of NAS of Ukraine, vo. 50, part 1, 2004, pp. 356–367, p. 357
- ^ Edward R. Floyd: Classical limit of the trajectory representation of quantum mechanics, loss of information and residual indeterminacy, arXiv:quant-ph/9907092v3
- ^ R. Carroll: Some remarks on time, uncertainty, and spin, arXiv:quant-ph/9903081v1
- ^ B. Hiley, R. E. Callaghan: The Clifford algebra approach to quantum mechanics A: The Schrödinger and Pauli particles, 14 March 2010, p. 6
- ^ B. Hiley, R. E. Callaghan: The Clifford algebra approach to quantum mechanics A: The Schrödinger and Pauli particles, 14 March 2010, p. 1-29
- ^ a b B. Hiley: Clifford algebras and the Dirac–Bohm Hamilton–Jacobi equation, 2 March 2010, p. 22
- ^ B. J. Hiley: Non-commutative geometry, the Bohm interpretation and the mind–matter relationship, p. 14
- )
- ^ P.N. Kaloyerou, Investigation of the Quantum Potential in the Relativistic Domain, PhD. Thesis, Birkbeck College, London (1985)
- ^ P.N. Kaloyerou, Phys. Rep. 244, 288 (1994).
- ^ P.N. Kaloyerou, in "Bohmian Mechanics and Quantum Theory: An Appraisal", eds. J.T. Cushing, A. Fine and S. Goldstein, Kluwer, Dordrecht, 155 (1996).
- ^ D. Bohm, B. J. Hiley, P. N. Kaloyerou: An ontological basis for the quantum theory, Physics Reports (Review section of Physics Letters), volume 144, number 6, pp. 323–348, 1987 (PDF)
- ISBN 0-7923-3670-4, pages 141-156
- ISBN 81-902190-9-X, page 82, eq.(37) ff.
- ISBN 978-81-902190-9-9.
- ISBN 0-521-48543-6, p. 498 ff.
- arXiv:0811/0811.1905(submitted 12 November 2008 (v1), revised 12 Jan 2009)
- ^ Nikolic, H. 2010 "QFT as pilot-wave theory of particle creation and destruction", Int. J. Mod. Phys. A 25, 1477 (2010)
- arXiv:1002.3226v2[quant-ph] (submitted on 17 Feb 2010, version of 31 May 2010)
- ^ Hrvoje Nikolić: Bohmian mechanics in relativistic quantum mechanics, quantum field theory and string theory, 2007 J. Phys.: Conf. Ser. 67 012035
- ^ See also: De Broglie–Bohm theory#Relativity
- ISBN 0-521-48543-6, p. 520 ff.
- ISBN 2-86332-169-2, p. 99–117, p. 144
- ^ B. J. Hiley: The Bohm approach re-assessed (2010 preprint), p. 6
- ^ B. J. Hiley (2013-03-25). "Bohmian Non-commutative Dynamics: History and New Developments". Pre-print arXiv:1303.6057 (submitted 25 March 2013)
- ISBN 978-1-85274-061-0
- ISBN 3-540-22188-3, pp. 299 ff., therein p. 310
- ^ Basil Hiley & Taher Gozel, episode 5, YouTube (downloaded 8 September 2013)
- ^ B. J. Hiley: Some remarks on the evolution of Bohm's proposals for an alternative to quantum mechanics, 30 January 2010
- ^ See also: Basil Hiley#Quantum potential and active information
- ISBN 0-521-48543-6, p. 72
- ^ G. Iannaccone, G. Curatola, G. Fiori: Effective Bohm Quantum Potential for device simulators based on drift-diffusion and energy transport, Simulation of Semiconductor Processes and Devices, 2004, vol. 2004, pp. 275–278
- ^ Eric R. Bittner: Quantum tunneling dynamics using hydrodynamic trajectories, arXiv:quant-ph/0001119v2, 18 February 2000, p. 3.
- ^ E. Gindensberger, C. Meier, J.A. Beswick: Mixing quantum and classical dynamics using Bohmian trajectories Archived 2012-03-28 at the Wayback Machine, Journal of Chemical Physics, vol. 113, no. 21, 1 December 2000, pp. 9369–9372