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Revisiting the Half Quanta and Defining Quantum Step Mechanics ()

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*Journal of Modern Physics*,

**7**, 1949-1952. doi: 10.4236/jmp.2016.714172.

1. Introduction

In 1900 or thereabouts, Berlin theoretician Max Planck accidentally uncovered the fact that motion in nature occurs in the form of elements each carrying the same amount, the same quantity―the same quantum―of dynamical action. He assigned to this element the symbol b later changed to h.

While in England some thirteen years later (in 1913) Danish physicist Niels Bohr published his celebrated paper “On the Constitution of Atoms and Molecules” [1] in which he speculates that electrons in atoms circulate on circular “orbits” and therefore possess angular momentum. Setting aside (ignoring) the fact that angular momentum has the dimension of dynamical action―just as Planck’s action element h does―Bohr mimicked Planck and declared that angular momentum must also consist of “elements” for the designation of which he selected the (cumbersome) symbol M_{0} thereby introducing―not necessarily on purpose but certainly in effect―a cacophony in the nascent theory of Quantum physics: physicists had suddenly not one but two competing elements of action to contend with, Pkanck’s h and Bohr’s M_{0} for rotational motion.

A decade or so later, Cambridge physicist Paul Adrien Dirac aggravated the situation when he substituted his own symbol, the graphic (h-bar) ħ. to designate the Bohr angular momentum “quantum element” M_{0}, whereby the symbol became known as the “Dirac constant”.

Whatever Dirac’s intimate motivation might have been when he took this initiative, it backfired on him: the “Dirac constant” soon became known and is commonly known nowadays as the Reduced Planckconstant.

In a recent publication [2] , one of us considers the equation which yields the allowed “energy levels” and notably the ground state energy, for a 1-D quantum harmonic oscillator. This equation may be written in different ways. When the Dirac h-bar symbol ħ is used, a factor 0.5 occurs in the equation, leading to the consideration of “half quanta”. The factor 0.5 disappears when the equation is written using Planck’s h instead of the Dirac h-bar symbol. The conclusions presented in [2] regarding the half quanta are presumably correct in their own rights. We present in this note another set of conclusions.

2. The Devil Hides in Details

The situation is quite simple. Consider a 1-D quantum harmonic oscillator oscillating with vibrational frequency ν. Instead of ν one can just as well consider the angular frequency w given by

(1)

Keeping in mind that the reduced Planck constant is related to the “ordinary” Planck constant by the equation

(2)

one obtains readily for the 1-D quantum harmonic oscillator ground-state energy (n = 0):

(3a)

(3b)

Thus Equation (3b) yields for the ground state (n = 0), the “half quanta” E_{0} = ½ħw. This does not happen with Equation (3a).

In [2] , the following conclusion concerning the half quanta is proposed: “The innocent conclusion of the above half quanta is that our postulate gained mainly from experiments that quanta are indivisible cannot be as straight forward as one could naively have thought and who knows, it may open the door to unsuspected connections related to fractional-Hall effects and similar things”.

In [3] we examined the possibility that equations such as Equations (3a) and (3b) above must properly be written so as to allow the elementary quantum h to be considered to be an “active principle” apt to “express itself” or be expressed as the composition of two factors a and b, here yielding for Equation (3a):

in which d =1/ν measures a time duration.

A sharp difference thus opposes the two points of view we are briefly examining in this note. The difference is expressed forcefully in [2] in these terms: “A photon is an elementary particle, in fact the most elementary messenger particle of them all and hν has the same physical meaning as a photon”.

Not so in [3] , quite to the contrary.

3. Inventing Quantum Step Mechanics

The considerations presented in [2] constitute a coherent ensemble in the framework of the formalism called Quantum Mechanics by its co-inventor Werner Heisenberg, equally inventor of the Uncertainty Principle two years later (in 1927). By contrast, the scheme developed in [3] asserts that when the quantum generates an energy E in the Void, it simultaneously generates a “time duration” d such that h = Ed with Absolute Certainty. We propose to name the scheme thus conceived Quantum Step Mechanics (the quantum takes continuously but discontinuously steps to construct and deconstruct structures in the Void with Absolute Certainty {3]).

4. Conclusion

Readers of this note are cordially invited to contribute their thoughts on how to reconcile the apparently irreconcilable results we have presented and to suggest how best to address this vexing question: is the Dirac h-bar symbol ħ a legitimate and useful innovation in Quantum Physics, or should it be mercilessly discarded henceforth as a meaninglessly disturbing intruder? (Figure 1).

J. B. JPA private collection

Figure 1. On duty wondering: Will Dirac’s h-bar symbol soon disappear from sight in the uncanny realm of Quantum Physics to yield the place to the delightful certainties of Quantum Step Mechanics?

Acknowledgements

We wish to express our gratitude to Ms. Han Xu (Hellen), JMP Editorial Board Assistant, for her valuable help and kind advice in properly preparing this note for publication in this journal.

Conflicts of Interest

The authors declare no conflicts of interest.

[1] |
Bohr, N.N. (1913) Philosophical Magazine, XXV, 24. http://dx.doi.org/10.1080/14786441308634955 |

[2] |
El Naschie, M.S. (2016) Journal of Modern Physics, 7, 1420-1428. http://dx.doi.org/10.4236/jmp.2016.712129 |

[3] |
Auffray, J.-P. and El Naschie, M.S. (2016) Journal of Modern Physics, 7, 156-161 http://dx.doi.org/10.4236/jmp.2016.71017 |

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