In Part 1, we identified W*(x)W(x) (where W(x) is the spatial part of a wavefunction) as the probability to interact. In the classical limit, if one draws a curve roughly touching the peaks of W*(x)W(x), then this probability is sometimes identified in the literature as proportional to the amount of time spent in dx, i.e. dt= dx/v(x). In the classical limit, however, dt(x) is not only the amount of time interacting in dx at x, but also the amount of time spent passing through dx at x. Such is not the case in quantum mechanics. For a bound state at any energy level, there is a KEave(x) = -1/2m d/dx dW/dx / W = E-V(x) = classical KE(x). This means there exists a vrms(x) so for a fixed dx, there is a quantum average passage time through dx, which may be more related to an ensemble average passage rather than any physical passage time. In such a case, we suggest that W*(x)W(x)dx is not only the probability to interact, but may be considered proportional to an ensemble average interaction time at dx. The expression V(x) W*(x)W(x) means that one weights the potential energy by the average amount of interaction time spent in dx at x. In other words, the quantum observable reality discussed in Part 1 seems to be equivalent to the interaction experience of the particle. It is not merely the case that there is a potential energy at x, there is also a certain interaction time spent in dx at this x (even in the classical case) and this is part of the potential energy experience of the particle. Thus, the potential energy V(x) is weighted by W*(x)W(x) to describe this experience. In the classical case, this dt interaction time is also physical passage time, but in quantum mechanics it is not (as will be shown). As a result, the quantum average Integral dx W*(x) operator W(x) = Integral dx W*(x)W(x) (operator W ) / W(x) represents both a reality based on external measurement or the particle’s experience interacting. Both are interaction realities. KE(x) = -1/2m d/dx dW/dx /W is also a physical expression which should have as much meaning as V(x) or E, but it is not based on the W*(x)W(x) weighted view of the particle. In Part 1, we focused on external measurements, but here we concentrate on the interaction of the particle with V(x) and suggest that this also gives a kind of physical meaning to <W V W> = Integral dx W* V W.
In Part 1, we identified W*(x)W(x) (where W(x) is the spatial part of a wavefunction) as the probability to interact. In the classical limit, if one draws a curve roughly touching the peaks of W*(x)W(x), then this probability is sometimes identified in the literature as proportional to the amount of time spent in dx, i.e. dt= dx/v(x). In the classical limit, however, dt(x) is not only the amount of time interacting in dx at x, but also the amount of time spent passing through dx at x. Such is not the case in quantum mechanics. For a bound state at any energy level, there is a KEave(x) = -1/2m d/dx dW/dx / W = E-V(x) = classical KE(x). This means there exists a vrms(x) so for a fixed dx, there is a quantum average passage time through dx, which may be more related to an ensemble average passage rather than any physical passage time. In such a case, we suggest that W*(x)W(x)dx is not only the probability to interact, but may be considered proportional to an ensemble average interaction time at dx. The expression V(x) W*(x)W(x) means that one weights the potential energy by the average amount of interaction time spent in dx at x. In other words, the quantum observable reality discussed in Part 1 seems to be equivalent to the interaction experience of the particle. It is not merely the case that there is a potential energy at x, there is also a certain interaction time spent in dx at this x (even in the classical case) and this is part of the potential energy experience of the particle. Thus, the potential energy V(x) is weighted by W*(x)W(x) to describe this experience. In the classical case, this dt interaction time is also physical passage time, but in quantum mechanics it is not (as will be shown). As a result, the quantum average Integral dx W*(x) operator W(x) = Integral dx W*(x)W(x) (operator W ) / W(x) represents both a reality based on external measurement or the particle’s experience interacting. Both are interaction realities. KE(x) = -1/2m d/dx dW/dx /W is also a physical expression which should have as much meaning as V(x) or E, but it is not based on the W*(x)W(x) weighted view of the particle. In Part 1, we focused on external measurements, but here we concentrate on the interaction of the particle with V(x) and suggest that this also gives a kind of physical meaning to <W V W> = Integral dx W* V W.
In (1), a formula for average dwell time in a step-potential damped region (from x=0 to x=ininite) is given by the Buttiker equation: time= m/(hbar k) Integral (0, infinite) W*(x)W(x) dx, where W(x), the wavefunction carries no units and is of the form: 2ik/(ik-k1) exp(-x/k1). Here k is the wavenumber in the V=0 region. We argue that in quantum mechanics one deals with average operator values: Integral dx W*(x) operator W(x) to yield an observable result. We call this observable result the measurement or interaction reality because it is based on the factor W*(x)W(x). We suggest that this factor is not the probability for a particle to be present within dx at x, but rather the probability for it to interact within dx at x. In other words, quantum observables based on using the factor W*(x)W(x) represents the information a measurement would reveal. The idea then seems to be that quantum mechanics only represents measurement/interaction reality. Mathematically, however, there are other situations. For a bound state, one has: KEave(x) + V(x) = En. KEave= -1/2m d/dx dW/dx / W and this value represents the classical kinetic energy at x. It is only when one multiplies KEave by W*(x)W(x) that one brings measurement/interaction reality into the picture. Furthermore, using W(x) means using a non-W*(x)W(x) weighted length scheme even though x is a quantum observable. If one has a bound state in an infinite well potential, the lowest bound state (x=0, x=L) is W(x)= C sin(3.14*x/L). Integrating from 0 to L or from 0 to L/2, yields L and L/2 respectively. Integrating from 0 to L/4, however, one does not yield L/4, neither does one obtain L/4 for integration from L/4 to L/2. Even though the metric in x-space for x which is fed into sin(3.14*x/L) is 1, i.e. the usual uniform classical x space, W*(x)W(x)dx is not the usual classical space, it has a different metric, an interaction or measurement metric. The point is that one seems to have two different length systems, i.e. two different metrics. Given that one may ask: What is the interaction probability at x?, one seems to have the usual classical metric in space because x is measured according to this metric. This metric could be established by a very high energy bound state in an infinite potential well. For the lowest bound state system, however, measurement indicates that there are few interactions near x=0 and x=L and so because measurement is the only way of establishing reality in quantum mechanics, it is suggested that the particle is mostly absent from these low to zero wavelength value points. We argue, however, that a wavefunction is only a measure of interaction and does not mean that the particle is not present at these zero wavelength value points. This is why the average kinetic energy is the same at all x points from 0 to L, we argue. We suggest that there can exist a reality other than the measurement based one for a quantum system. Just because one does not measure a particle at W(x)=0 does not mean that it cannot exist at this point. This suggests that using Integral W*(x)W(x) dx to calculate a dwelling time in a tunneling region is a measurement based length and so one should be aware that this kind of reality is being used in such a calculation.
In classical physics, a particle traveling to the right is the mirror image of one traveling to the left. In terms of a spatial density (the time spent in each constant dx), the value is the same, as is the energy. A similar notion of such a spatial invariance is in the classical conservation of energy equation for a bound particle: p(x)p(x)/2m + V(x) = E. Quantum mechanics seems to be different because exp(ipx) and exp(-ipx) are distinctly different spatial probabilities, i.e. they are dynamic. It is not just that case that a particle moves to the right for exp(ipx) and to the left for exp(-ipx). The impulse hit probabilities (represented by exp(ipx) and exp(-ipx)) are distinctly different. If one wishes to create an OR situation and write: W(x) = Sum over p a(p)exp(ipx) and use this in a conservation of energy equation, then simply including only positive or negative p values in W(x) leads to a complex average kinetic energy -1/2m d/dx dW/dx / W which cannot be used with V(x) and E. Furthermore, W_ (only negative p) and W+ (only positive p) values do not yield the same average kinetic energy. Fortunately, given that this is a statistical average for a localized object (somewhat analogous to a gas), one may combine W+ + W- and obtain a real kinetic energy. We have argued in previous notes that there exists a quantum-classical duality. For example, for a free particle one has two independent notions. One is x=vt which describes the center-of-mass of the particle. We take this to represent a state description which treats v and -v as mirror images. exp(ipx), on the other hand, represents probabilistic impulse hits and does not define the state by itself, we argue, only its interactions. Interactions are physical and define what happens in an interacting system. One may, however, measure a system, i.e interact with exp(ipx), and this should define a measurement state ( a second state ensemble average). For example, exp(ipx)exp(-ipx) = 1 which is equivalent to the constant dt in each dx associated with x=vt. Thus, the two states coincide, but exp(ipx)exp(-ipx) means that one may place the 2-slit apparatus at any x point and is not about the center-of-mass, as x=vt is. In some cases, the two states are quite different. W*(x)W(x) represents an interaction state, but vrms(x) from .5mvrms(x)vrms(x) = -1/2m d/dx dW/dx / W represents a center-of-mass state description. (Note: in these cases a state means an average state, i.e. an average over many ensemble entries.) If one takes W*(x)W(x) and integrates over x, then interference terms vanish and one obtains a classical counting of distinct p value states with their weight a*(p)a(p).This, we argue, leads to the notion of orthogonality of probabilities. In classical probability, there is no such notion, but there is the notion of AND (multiply) probabilities. Given exp(ipx) and exp(-ipx), if one multiplies one removes p, i.e. the interactions and only sees the state left. W*(x)W(x) yields a set of peaks which represent a pattern of probabilistic hits in space which define a state which one would measure in space. The interference pattern, however, must be one such that if one integrates over x, one only obtains a classical sum of probabilities a*(p)a(p)’s as mentioned above. This leads to the notion of orthogonal exp(ipx)’s (which follows mathematically anyway). If one considers different bound En states, then these two are orthogonal because W*n1(x)Wn2(x) mean n1 and n2 are associated with different energies and integrating over x cannot show a result which looks like a state result, where W*n(x)Wn(x) shows a state result. In order to achieve this orthogonality (linked directly to the notion of a state) one must have that Wn(2) usually has 0 points and is positive and negative with the possible exception of a ground state. In other words, if Wn1*(x)Wn2(x) integrated over x is not 0, one violates conservation of energy. As a result, we argue an average probability for a bound state must statistically include +p and -p contributions and must create a function which has positive and negative peaks (except possibly for the ground state), i.e. W(x) must have 0 points. This W(x) is linked to a measurement state W*(x)W(x), but this is strictly considering exp(ipx)s. We argue that there are two pieces of information for a free particle, x=vt and exp(ipx). There must also be an average state linked to x=vt and this given by KEave(x) = .5m vrms(x)vrms(x) + V(x) = E which shows that the particle may exist and have average kinetic energy even at W(x)=0 points. When measuring a system, one interacts with the exp(ipx)s and so the W*(x)W(x) state is the one which is traditionally presented, but whether one measures the center-of-mass motion or not, one also has the notion of the x=vt, i.e. vrms(x) state (average) as well, we argue.
Quantum mechanics utilizes a wavefunction W(x)=Sum over p a(p)exp(ipx) (in time independent cases) with exp(ipx) being what we call a free particle complex probability. In such a case, W(x) is an OR scenario of these various probabilities. We have argued in previous notes that exp(ipx) is the probability for a p impulse hit at x, even if the center-of-mass of the particle is not at x. This means that impulse hits may occur probabilistically in space as in the 2-slit example which requires adding two probabilities as an OR case for each slit. The point then seems to be that W(x) (or even its momentum frozen form W*(x)W(x) gives a profile in space of the number of interactions (various p impulse hits) at each x. Classically, the kinetic energy (nonrelativistic) is pp/2m. In a classical bound problem this kinetic energy is considered to exist (in calculations) at the center-of-mass, but forces are also said to be rendered at this point so pp/2m, the center-of-mass and the force hit point all coincide. In quantum mechanics, a p impulse hit and the center-of-mass do not coincide. If p is said to hit at a probabilistic x, then it seems that pp/2m should also be seen to exist at this same hit point. A physical interaction point verifies in a sense the location of pp/2m in a probabilistic manner, i.e. a(p) exp(ipx)/W(x) is the probability used to calculate KEaverage and this is based on impulse hit locations. By normalizing using W(x), one removes the relative number of average hits at each x and obtains a pure energy value at x. (This may then be used in a KEave(x)+V(x)=E equation.) On average W(x) has zero points, which means that if one considers W*(x)W(x) to represent the motion-frozen-out spatial distribution of hits, then no hits are rendered at certain x points (on average). One might argue then that the particle cannot exist at x, but the center-of-mass can exist anywhere. One might next argue that there is no kinetic energy at x, but that cannot be true because 1/2m d/dx d/dx W has the same 0 points as W and the two divide. Thus, there is average kinetic energy at all bound points and this represents an average based on impulse hits (exp(ipx)). Classically, if one has many particles in a potential, one may write density(x)V(x) to find the potential energy of the particles. This implies that the particles interact with V(x), e.g. neutrinos usually do not interact. Density(x) in a classical sense means that the center-of-mass and force hit point are both at x. In quantum mechanics, exp(ipx) represents the probability for a force hit point, W(x) represents an average and W*(x)W(x) represents a motion-frozen average hit point. W*(x)W(x)V(x) seems to represent the average potential energy of the particle at x because W*(x)W(x) is linked with interaction. Even if a particle is not present, however, there is energy V(x) in space. It seems that if W*(x)W(x)=0 at some x, then there is no average particle interaction at this point, but there is still average kinetic energy Sum over p a(p)pp/2m exp(ipx) / W(x) based on the probability for average probability hits. The key idea is that one normalizes probability by dividing by W(x) in the average kinetic energy calculation. W*(x)W(x) is normalized not at x, but integrating over dx and setting this value to 1. One has relative hit at x values represented by W*(x)W(x). For exp(-ipx)exp(ipx)=1, each dx has the same average hit value (with one not being able to distinguish details in hbar/p, i.e. this is a motion frozen result. The question then becomes: Why would one write: W*(x)W(x) KEave(x)? One might argue that this term occurs if one takes the quantum mechanical equation: KEave(x) +V(x) = En and multiplies by W*(x)W(x). One may ask: Does V(x)W*(x)W(x) have physical meaning? V(x) is the potential energy at x. The average interaction probability with V(x) at x should be W(x)V(x) and not W*(x)W(x)V(x). The latter is a classical mechanical idealization. If W*(x)W(x) is 3 at x1 and 2 at x2, then it is as if the particle interacts 1.5 times more at x1 and so if V(x1)=V(x2), then this approach assumes 1.5 the interaction energy at x1. KEave(x), however, is simply free particle energy (average) at x and one does not need to take this average value and multiply it by the relative number of interactions at x. W(x) has zero points meaning that there is no interaction at such a point on average. KEave(x) on the other hand is the average energy at x based on the particle kinetic energy presence pp/2m being at the point of an impulse hit. This does not mean that an interaction is occurring with V(x) at this point in this formalism. Even a free particle has an exp(ipx) probability when it is not interacting. The sum Sum over p a(p)exp(ipx) means that all of the interactions linked with x have occurred and one is making an OR calculation. KEave(x) is free particle kinetic energy at x and V(x) is potential energy (not interaction potential energy with the particle). Multiplying by W*(x)W(x) is a classical minded approach to creating a classical equation: density(x) (KEave(x)+V(x)) = E density(x) ((1)) Here KEave(x) would represent the average kinetic energy of a single particle and density(x) would be the average number of particles at x. density(x)KE(x) has a clear meaning. W*(x)W(x) KEave(x) on the other hand is different. KEave(x) is actually the classical kinetic energy value at x and so it is not clear why one would multiply it by W*(x)W(x). W*(x)W(x) represents the probability for an impulse hit at x in a p-frozen out picture. The notion of exp(ipx) (i.e. probability for a p hit at x) is already buried within the quantum calculation of KEave(x) (which yields the classical value). In order to find the physical meaning of W*(x)W(x) multiplied by KEave(x) or V(x) it seems that one has broken dx into equally sized segments which correspond to different detection hits of the particle. This is then somehow equated with the presence of the particle per unit time in dx which is then somehow rendered as the average energy at x multiplied by the detected presence at x through a steady rate of measurement/time. Thus, multiplying by W*(x)W(x) is not multiplying by a physical density.
We argue that in a quantum bound state with one particle, the particle receives stochastic hits from a potential. As a result, if one examines a point x, the particle may be present at ti with momentum pi (in both the forward and backward directions) leading to a momentum distribution with a conditional probability P(p/x) = a(p) exp(ipx)/W(x) where W(x) is the wavefunction. Thus, one does not follow a stochastic particle in time, but rather describes it by a probability distribution at each x. One may next ask whether this conditional probability at x changes in time? This is not the actual time related to stochastic motion of the particle. To answer this question, we argue one must consider interactions which occur at x which are part of an energy equation. Even in classical physics, the energy equation at x indicates how a particle’s motion changes. Thus, we argue one does not simply take measurements at x of ti and pi, but that at each ti, a particle with pi is undergoing dynamic changes and these may be considered as well. If one describes the quantum picture by W(x) i.e. a momentum distribution, one may find a collective interaction given by -1/2m d/dx d/dx W + VW. The coupling between V(x)=Sum over k V(x)exp(ikx) and the particle conditional probabilities in W is apparent in the VW term. This energy term should describe whether the momentum distribution changes in time i.e should be proportional to dW/dt (partial derivative), but should also equal the average energy. Thus, a link exists between ensemble energy and time. In this note, we argue that these ideas may be applied to P(p/x) in a bound state resonance because the same E applies to each p.
It is sometimes stated in the literature (1) that quantum mechanics is based on conditional probabilities. If this is the case, one would expect such conditional probabilities to appear in a single particle bound state. A free quantum particle is associated with a probability to interact of exp(ipx) (linked to 2-slit interference, 1-D reflection-refraction at an n1-n2 junction etc), but the kinetic energy and momentum are pp/2m (nonrelativistic) and p at all x even though each x has a different phase according to exp(ipx). The momentum is p at x, but the probability for an impulse hit at x is not the same even though its modulus is. When different probabilities exp(ipx) add in an OR situation, this leads to a spatial pattern which no longer has a modulus of 1, i.e. translational invariance is broken. Such a pattern also occurs for a single particle bound state W(x)=Sum over p a(p)exp(ipx). W(x) can have 0 points, but the average kinetic energy -1/2m d/dx dW/dx / W is not 0 at such a point. One has, on average (a statistical calculation), no average interaction at such an x point. One might ask why this should have anything to do with average kinetic energy? If one writes a conservation law: KEave(x) + V(x) = 0, then one considers kinetic energy interacting with potential energy. If there is no interaction at some x point for a given p (not W(x) on average), then it should not be part of the conservation of energy at this point. One is only interested in kinetic energy which interacts with potential energy at each x point. Thus, a(p) exp(ipx) + a(-p) exp(-ipx) (with a(p)=a(-p)) may have a 0 point at some x and so it does not have an average interaction at such a point, i.e. pp/2m (a(p)exp(ipx) + a(-p)exp(-ipx)) = 0. As a result, in a bound state, one considers kinetic energy per p, -p multiplied by the average probability (p, -p). Different a(p)exp(ipx) + a(-p)exp(-ipx) (a(p)=a(-p)) weights in this average picture indicate the extent to which the particle interacts. This idea holds for a single p,-p pair, but one must normalize over all such pairs, leading to the idea of a conditional probability. Given that hbar/p must be “created physically” in space so to speak, one must have interaction probability which creates this physical situation even in cos(px)+ i sin(px). This leads to the idea of interaction probability being 0, positive, but <1, or even negative and it is the interaction which allows one to consider conservation of energy with a potential V(x) in the first place. As a result, one cannot include a full pp/2m if there is negative, 0 or only particle interaction. Thus, pp/2m is multiplied by 2 a(p)cos(px) /W(x) for a(p)=a(-p).
In Part 1, we noted that W*(x)W(x) represents the average number of interaction hits at x for an equilibrium (p, -p) scenario. This follows from exp(ipx) representing the probability for a p hit at x. If -p is also present with the same weight, then exp(ipx)+exp(-ipx) is proportional to cos(px), showing that some x points have low or no probability for a p hit. We argued, however, that these hit points are not at the center-of-mass so the center-of-mass could be at a 0 point. More importantly, average kinetic energy exists at these low or no hit points. In this note, we wish to examine the average kinetic energy more closely. It is built upon both classical Newtonian (nonrelativistic) ideas and the notion of a probabilistic x point for p hits, given by the probability exp(ipx). We note that both x and V(x) are continuous, but suggest that a probabilistic picture is compatible with non-continuous impulse hits. In particular, lengths are of the order of 10 power -10 m (atomic) or 10 power -15 m (nuclear) and particle speeds, on the order of 10 power 7 m/s. This suggests that V(x) and exp(ipx) are associated with ensembles. In the classical case with very slow speeds and large lengths compared to the above numbers, a tiny dx seems to represent an ensemble. Each dx represents an average result p(x)p(x)/2m + V(x) = E. In the quantum case, one needs to use an average based on exp(ipx) (as argued in Part 1) because pp/2m is seen to exist and change at an interaction point. Thus, {Sum over p a(p)pp/2m exp(ipx) }/{Sum over p a(p)exp(ipx)} represents an average KE at an x interaction point which may be linked to the V(x) at this same point. One must have kinetic energy at an interaction point for it to be compatible with V(x)