Masteries · Jason GlowneyArithmoí Book 1

Masteries

1.8.2 The Flowing Point of Axial Light

First, we con­sid­er the fa­mil­iar group com­prised of the iX1iX_{1}-type Lie al­ge­bra from U(3)U(3)

G(iX1)=(eiθ000cos⁡(θ)isin(θ)0isin(θ)cos⁡(θ)),\begin{array}{r} G\left( iX_{1} \right) = \begin{pmatrix} e^{i\theta} & 0 & 0 \\ 0 & \cos(\theta) & isin(\theta) \\ 0 & isin(\theta) & \cos(\theta) \end{pmatrix}, \end{array}
(1.8.1)

where eiθe^{i\theta} is de­fined as the group gen­er­a­tor's ro­ta­tion axis, and the bottom right 2×22 \times 2 matrix ro­tates in the X2/X3X_{2}/X_{3}-plane. Math­e­mat­i­cal­ly, a zero-di­men­sion­al point is a co­or­di­nate in space, and we define vτv_{\tau} as the co­or­di­nates of the ver­tices of the equi­lat­er­al tri­an­gle at a cal­cu­la­tion time τ\tau, which are lo­cat­ed on the bound­ary of the unit ball de­fined by the S3ℂ∞S_{3\mathbb{C}}^{\infty} sym­me­try up ∈ℂ3\in \mathbb{C}^{3}. The iden­ti­ty co­or­di­nate vector, v0v_{0}, is then de­fined as

v0=(111).\begin{array}{r} v_{0} = \begin{pmatrix} 1 \\ 1 \\ 1 \end{pmatrix}. \end{array}
(1.8.2)

Next, we have the group gen­er­a­tor acting on v0v_{0} by taking the prod­uct

G(iX1)v0=(eiθ000cos⁡(θ)isin(θ)0isin(θ)cos⁡(θ))(111)=(eiθcos⁡(θ)+isin(θ)cos⁡(θ)+isin(θ))=v1,\begin{array}{r} G\left( iX_{1} \right)v_{0} = \begin{pmatrix} e^{i\theta} & 0 & 0 \\ 0 & \cos(\theta) & isin(\theta) \\ 0 & isin(\theta) & \cos(\theta) \end{pmatrix}\begin{pmatrix} 1 \\ 1 \\ 1 \end{pmatrix} = \begin{pmatrix} e^{i\theta} \\ \cos{(\theta) + isin(\theta)} \\ \cos{(\theta) + isin(\theta)} \end{pmatrix} = v_{1}, \end{array}
(1.8.3)

where the group gen­er­a­tor G(iX1)G\left( iX_{1} \right) has acted on the co­or­di­nate v0v_{0}, giving each di­men­sion ∈ℂ3\in \mathbb{C}^{3} a wave­form sig­na­ture for some chosen an­gu­lar fre­quen­cy θ.\theta.To dif­fer­en­ti­ate be­tween the axis and the ro­tat­ing planes in the prod­uct above, we have kept the axis por­tion of the vector result as eiθe^{i\theta}, while ex­pand­ing the values in the planes where the ro­ta­tion occurs as cos⁡(θ)+isin(θ)\cos{(\theta) + isin(\theta)} re­spec­tive­ly. We have G(iX1)G\left( iX_{1} \right) act again on the vector result now de­fined as v1v_{1}, find­ing

G(iX1)×v1=(eiθ000cos⁡(θ)isin(θ)0isin(θ)cos⁡(θ))(eiθcos⁡(θ)+isin(θ)cs(θ)+isin(θ))=(e2iθcos⁡(2θ)+isin(2θ)cos⁡(2θ)+isin(2θ)),\begin{array}{r} G\left( iX_{1} \right) \times v_{1} = \begin{pmatrix} e^{i\theta} & 0 & 0 \\ 0 & \cos(\theta) & isin(\theta) \\ 0 & isin(\theta) & \cos(\theta) \end{pmatrix}\begin{pmatrix} e^{i\theta} \\ \cos{(\theta) + isin(\theta)} \\ {cs}{(\theta) + isin(\theta)} \end{pmatrix} = \begin{pmatrix} e^{2i\theta} \\ \cos{(2\theta) + isin(2\theta)} \\ \cos{(2\theta) + isin(2\theta)} \end{pmatrix}, \end{array}
(1.8.4)

where the v2v_{2} vector wave­forms have ad­vanced a dis­tance of 2θ2\theta ra­di­ans in com­plex space. The vital point to note is that the wave­form vector v2v_{2} con­tains in­for­ma­tion on a co­or­di­nate lo­ca­tion in com­plex space, while the group gen­er­a­tor G(iX1)G\left( iX_{1} \right) in­cludes the formal fre­quen­cy and how the co­or­di­nate moves in com­plex space. Seeing how these two forms differ in their in­for­ma­tion con­tent is a sig­nif­i­cant step to­wards un­der­stand­ing uni­ver­sal dy­nam­ics on the quan­tum level, which ex­plic­it­ly states that vjv_{j} is the lo­ca­tion in com­plex space, and G(iX1)G\left( iX_{1} \right) de­fines how vjv_{j} moves in that com­plex space. This is anal­o­gous to quan­tum me­chan­ics' po­si­tion and mo­men­tum and the im­plied un­cer­tain­ty prin­ci­ple. We ex­press this evolv­ing system of matrix-vector prod­ucts as

G(iX1)τ×v0=vτ,\begin{array}{r} G\left( iX_{1} \right)^{\tau}{\times v}_{0} = v_{\tau}, \end{array}
(1.8.5)

for τ∈ℤ≥0\tau\in \mathbb{Z} \geq0, where G(iX1)τG\left( iX_{1} \right)^{\tau} sig­ni­fies how G(iX1)G\left( iX_{1} \right) changes over a cal­cu­la­tive time, taking the form

G(iX1)τ=(eτiθ000cos⁡(τθ)isin(τθ)0isin(τθ)cos⁡(τθ)).\begin{array}{r} G\left( iX_{1} \right)^{\tau} = \begin{pmatrix} e^{\tau i\theta} & 0 & 0 \\ 0 & \cos(\tau\theta) & isin(\tau\theta) \\ 0 & isin(\tau\theta) & \cos(\tau\theta) \end{pmatrix}. \end{array}
(1.8.6)

Since v0=(1,1,1)Tv_{0} = (1,1,1)^{T}, we can ex­press our co­or­di­nate vector in the equiv­a­lent form

v0=(e(2iπ)cos⁡(2π)+isin(2π)cos⁡(2π)+isin(2π)),\begin{array}{r} v_{0} = \begin{pmatrix} e^{(2i\pi)} \\ \cos{(2\pi) + isin(2\pi)} \\ \cos{(2\pi) + isin(2\pi)} \end{pmatrix}, \end{array}
(1.8.7)

which en­ables us to ex­press vτv_{\tau} as

vτ=(e(2iπ+τiθ)cos⁡(2π+τθ)+isin(2π+τθ)cos⁡(2π+τθ)+isin(2π+τθ)),\begin{array}{r} v_{\tau} = \begin{pmatrix} e^{(2i\pi + \tau i\theta)} \\ \cos{(2\pi + \tau\theta) + isin(2\pi + \tau\theta)} \\ \cos{(2\pi + \tau\theta) + isin(2\pi + \tau\theta)} \end{pmatrix}, \end{array}
(1.8.8)

show­ing us how the po­si­tion evolves in time for the wave­func­tion.

Before we choose a value for the an­gu­lar ve­loc­i­ty θ\theta and pro­ceed to study how the G(iX1)τ×v0=vτG\left( iX_{1} \right)^{\tau}{\times v}_{0} = v_{\tau} forms evolve, we need to con­sid­er the geo­met­ric arrange­ment of the axes of the U(3)U(3) group's geo­met­ric struc­ture, and show how the real cosine and imag­i­nary sine waves project or­thog­o­nal­ly in their re­spec­tive X1,X2,X3X_{1},X_{2},X_{3}-planes.

Figure
Figure 1.8.1 – The U(3)U(3) sphere wave pro­jec­tion where green waves are waves from the X1X_{1}-plane,

blue waves are waves from the X2X_{2}-plane, and red waves are waves from the X3X_{3}-plane.

In the figure above, the ori­en­ta­tion of each re­spec­tive disc's real and imag­i­nary axes, for which the in­di­vid­ual trigono­met­ric func­tions project back onto, is color-co­or­di­nat­ed. We take the ex­am­ple of the red cosine wave from the X3X_{3}-plane, its real values project back onto the real-valued X3X_{3} the red disc's axis por­tion also trav­els in the di­rec­tion of the X1X_{1}-axis along with the green imag­i­nary X1X_{1} sine wave, where the iπ2\frac{i\pi}{2} radian ro­ta­tion around the X1X_{1}-axis or­thog­o­nal­ly re­lates these waves. Im­por­tant to grasp is that when con­sid­er­ing the spa­tial di­rec­tion of prop­a­ga­tion for these two vec­tors, they travel in the same di­rec­tion, albeit they are iπ2\frac{i\pi}{2} ra­di­ans out of phase with one an­oth­er, with one imag­i­nary and the other real. We com­pare this to the prop­a­ga­tion of the blue real cosine wave along the X2X_{2}-axis, to find that it trav­els in a plane or­thog­o­nal to the pre­vi­ous­ly men­tioned wave­forms.

The next issue that we con­sid­er is the log­a­rithm func­tion itself in com­plex space; by taking the ex­am­ple for the func­tion e(z+2iπk)e^{(z + 2i\pi k)}, with z=(a+ib)∈ℂ,z = (a + ib)\in \mathbb{C},and k∈ℤk\in \mathbb{Z}, its log­a­rithm would typ­i­cal­ly be cal­cu­lat­ed as fol­lows

ln⁡(e(z+2iπk))=ln⁡(ez)+ln⁡(e2iπk)=ln⁡(ez)+ln⁡(1)=z.\begin{array}{r} \ln{\left( e^{(z + 2i\pi k)} \right) =}\ln{\left( e^{z} \right) + \ln\left( e^{2i\pi k} \right)} = \ln{\left( e^{z} \right) + \ln(1) = z}. \end{array}
(1.8.9)

The groups pre­sent­ed in this book have all been as­sumed to be bi­jec­tive, mean­ing that each el­e­ment of a set is paired one-to-one with the el­e­ment of an­oth­er set, and the other el­e­ments pair with ex­act­ly one el­e­ment of the first set, leav­ing no el­e­ments un­paired. Bi­jec­tiv­i­ty indeed holds if we re­strict the domain of the ex­po­nen­tial func­tion to a branch of ln⁡(ez)\ln\left( e^{z} \right), avoid­ing any num­bers in the domain dif­fer­ing by an in­te­ger mul­ti­ple of 2iπ2i\pi, where we have been re­strict­ing the do­mains of our groups to the log­a­rithm's prin­ci­pal value. We say that the bi­jec­tiv­i­ty of a group is the re­quired com­bi­na­tion that all the el­e­ments are both in­jec­tive and sur­jec­tive. For a func­tion/group to be in­jec­tive, it must meet the re­quire­ment that the el­e­ments map in a one-to-one cor­re­spon­dence, and for that to occur, the func­tion/group must be in­vert­ible. A sur­jec­tive func­tion maps an el­e­ment of its domain to every el­e­ment of the other func­tion's domain in a one di­rec­tion­al manner.

The way we cal­cu­lat­ed the pre­vi­ous log­a­rithm (ln⁡(e(z+i2πk)))\left( \ln\left( e^{(z + i2\pi k)} \right) \right), would fail in this in­jec­tive re­quire­ment, as would the groups that have been de­fined in this book if the el­e­ments in their do­mains ex­tend­ed beyond the prin­ci­pal value of the log­a­rithm. De­scrib­ing math­e­mat­i­cal­ly co­he­sive dy­nam­i­cal sys­tems re­quires that the com­plex log­a­rithm is not re­strict­ed to the domain of the prin­ci­pal value. As a com­plex system evolves in a de­fined geo­met­ric space­time, it trav­els in both imag­i­nary and real spaces si­mul­ta­ne­ous­ly, and this prop­a­ga­tion in com­plex spaces re­quires ex­tend­ing beyond the prin­ci­pal value's domain. Main­tain­ing in­jec­tiv­i­ty brings us to the re­al­iza­tion that the imag­i­nary parts of our de­fined groups must exist on non-com­pact Rie­mann sur­faces. To detail what this en­tails, we take our group gen­er­a­tor ex­am­ple, G(iX1)τG\left( iX_{1} \right)^{\tau}, as it evolves in time,

G(iX1)τ=(eτiθ000cos⁡(τθ)isin(τθ)0isin(τθ)cos⁡(τθ)),\begin{array}{r} G\left( iX_{1} \right)^{\tau} = \begin{pmatrix} e^{\tau i\theta} & 0 & 0 \\ 0 & \cos(\tau\theta) & isin(\tau\theta) \\ 0 & isin(\tau\theta) & \cos(\tau\theta) \end{pmatrix}, \end{array}
(1.8.10)

for which in­jec­tiv­i­ty would be com­pro­mised for the com­plex log­a­rithm map­ping when we find values of ikτθ=2iπik\tau\theta = 2i\pi, since ikτθ=4iπik\tau\theta = 4i\pi for kτ=2k\tau = 2, which would repeat for all fol­low­ing vari­ables of the form, n(ikτθ)=2iπnn(ik\tau\theta) = 2i\pi n, for n∈ℤ,kτ=2.n\in \mathbb{Z},k\tau = 2.

The Rie­mann sur­face is often pre­sent­ed as an el­e­gant so­lu­tion to the in­jec­tiv­i­ty prob­lem that exists for the com­plex log­a­rithm func­tion. Still, we would argue that it should not be sug­gest­ed as a workaround. In­stead, it should be con­sid­ered the cor­rect way to depict the evolv­ing com­plex func­tions and com­plex group func­tions in their Lie al­ge­bra forms and their ex­po­nen­tial­ly mapped Lie group forms.

Figure
Figure 1.8.2 – Non-com­pact Rie­mann sur­face plot for the imag­i­nary multi-valued por­tion of the com­plex number z.z.

In the figure above, as the com­plex number zz moves around the origin, the imag­i­nary values go up or down de­pend­ing on the di­rec­tion of ro­ta­tion. A com­plete ro­ta­tion of the com­plex unit circle by 2iπ2i\pi ra­di­ans will in­crease the imag­i­nary number's po­si­tion along the ver­ti­cal axis by 2π2\pi when ro­tat­ing in the pos­i­tive di­rec­tion. It de­creas­es the po­si­tion by the same amount when trav­el­ing in the neg­a­tive di­rec­tion.

We now return to the ex­am­ple, set­ting the an­gu­lar fre­quen­cy vari­able equal to θ=π6,\theta = \frac{\pi}{6},where G(iX1)τG\left( iX_{1} \right)^{\tau} be­comes

G(iX1(π6))τ=(e(iτπ6)000cos⁡(τπ6)isin(τπ6)0isin(τπ6θ)cos⁡(τπ6))\begin{array}{r} G\left( iX_{1}\left( \frac{\pi}{6} \right) \right)^{\tau} = \begin{pmatrix} e^{\left( \frac{i\tau\pi}{6} \right)} & 0 & 0 \\ 0 & \cos\left( \frac{\tau\pi}{6} \right) & isin\left( \frac{\tau\pi}{6} \right) \\ 0 & isin\left( \frac{\tau\pi}{6}\theta \right) & \cos\left( \frac{\tau\pi}{6} \right) \end{pmatrix} \end{array}
(1.8.11)

then let the system

G(iX1)τ×v0=vτ,\begin{array}{r} G\left( iX_{1} \right)^{\tau}{\times v}_{0} = v_{\tau}, \end{array}
(1.8.12)

evolve from τ=0\tau = 0 to τ=12.\tau = 12.In doing so, we find the fol­low­ing set of thir­teen co­or­di­nate vec­tors, which rep­re­sents the system over the cal­cu­la­tive time in­ter­vals

vτ={(e011),(eiπ632+i232+i2),(eiπ312+i3212+i32),(eiπ2ii),(e2iπ3−12+i32−12+i32),(e5iπ6−32+i2−32+i2),(eiπ−1−1),(e7iπ6−32−i2−32−i2),(e4iπ3−12−i32−12−i32),(e3iπ2−i−i),(e5iπ312−i3212−i32),(e11iπ632−i232−i2),(e2iπ11)}.\begin{array}{r} v_{\tau} = \left\{ \begin{array}{r} \begin{pmatrix} e^{0} \\ 1 \\ 1 \end{pmatrix},\begin{pmatrix} e^{\frac{i\pi}{6}} \\ \frac{\sqrt{3}}{2} + \frac{i}{2} \\ \frac{\sqrt{3}}{2} + \frac{i}{2} \end{pmatrix},\begin{pmatrix} e^{\frac{i\pi}{3}} \\ \frac{1}{2} + \frac{i\sqrt{3}}{2} \\ \frac{1}{2} + \frac{i\sqrt{3}}{2} \end{pmatrix},\begin{pmatrix} e^{\frac{i\pi}{2}} \\ i \\ i \end{pmatrix},\begin{pmatrix} e^{\frac{2i\pi}{3}} \\ - \frac{1}{2} + \frac{i\sqrt{3}}{2} \\ - \frac{1}{2} + \frac{i\sqrt{3}}{2} \end{pmatrix},\begin{pmatrix} e^{\frac{5i\pi}{6}} \\ - \frac{\sqrt{3}}{2} + \frac{i}{2} \\ - \frac{\sqrt{3}}{2} + \frac{i}{2} \end{pmatrix},\begin{pmatrix} e^{i\pi} \\ - 1 \\ - 1 \end{pmatrix}, \\ \begin{pmatrix} e^{\frac{7i\pi}{6}} \\ - \frac{\sqrt{3}}{2} - \frac{i}{2} \\ - \frac{\sqrt{3}}{2} - \frac{i}{2} \end{pmatrix},\begin{pmatrix} e^{\frac{4i\pi}{3}} \\ - \frac{1}{2} - \frac{i\sqrt{3}}{2} \\ - \frac{1}{2} - \frac{i\sqrt{3}}{2} \end{pmatrix},\begin{pmatrix} e^{\frac{3i\pi}{2}} \\ - i \\ - i \end{pmatrix},\begin{pmatrix} e^{\frac{5i\pi}{3}} \\ \frac{1}{2} - \frac{i\sqrt{3}}{2} \\ \frac{1}{2} - \frac{i\sqrt{3}}{2} \end{pmatrix},\begin{pmatrix} e^{\frac{11i\pi}{6}} \\ \frac{\sqrt{3}}{2} - \frac{i}{2} \\ \frac{\sqrt{3}}{2} - \frac{i}{2} \end{pmatrix},\begin{pmatrix} e^{2i\pi} \\ 1 \\ 1 \end{pmatrix} \end{array} \right\}. \end{array}
(1.8.13)

The axis of our G(iX1)τG\left( iX_{1} \right)^{\tau} group runs along the X1X_{1}-axis, whose values are in the first row of each vector and rep­re­sent the non-com­pact Rie­mann sur­face of the evolv­ing flow­ing point. We note that the axis entry of the last vector has trav­eled 2iπ2i\pi ra­di­ans along the ver­ti­cal axis of the Rie­mann sur­face.

We ori­en­tate the reader to the po­si­tion of the ini­tial vector v0=(e0,1,1)Tv_{0} = \left( e^{0},1,1 \right)^{T} in the fol­low­ing figure, which is the black tri­an­gle with ver­tices lo­cat­ed at values of +1+ 1 along the X1,X2,X3X_{1},X_{2},X_{3}-axes, and large col­ored arrows in­di­cate the di­rec­tion of prop­a­ga­tion for each of the tri­an­gle's ver­tices and the re­la­tion to the com­plex plane it ori­ents in.

Figure
Figure 1.8.3 – The ori­en­ta­tion of the tri­an­gle at the co­or­di­nates v0=(e0,1,1)T,v_{0} = \left( e^{0},1,1 \right)^{T},where X1X_{1} is the prop­a­ga­tion axis, and the col­ored arrows in­di­cate the di­rec­tion of di­ver­gence for each tri­an­gle vertex.

As pre­sent­ed in Figure 1.8.1, the imag­i­nary X1X_{1} sine wave in green prop­a­gates along the real X1X_{1}-axis, as does the red real X3X_{3} cosine wave ori­en­tat­ed iπ2\frac{i\pi}{2} ra­di­ans clock­wise about the real X1X_{1}-axis. Al­ter­na­tive­ly, the blue real X2X_{2} cosine wave prop­a­gates in an ori­en­ta­tion aligned with the real X3X_{3}-axis. We con­sid­er the di­rec­tion of prop­a­ga­tion for each as ori­ent­ed vec­tors and plot the flow­ing point system,

G(iX1)τ×0=v,\begin{array}{r} G\left( iX_{1} \right)^{\tau} \times_{0} = v_{}, \end{array}
(1.8.14)

in the figure below, it trav­els a dis­tance of 3π3\pi ra­di­ans along the X1X_{1}-axis in real space.

Figure
Figure 1.8.4 – The flow­ing point's wave­forms along the axis X1∈ℝX_{1}\in \mathbb{R}, for Xˆ3{\widehat{X}}_{3}, the elec­tric field in red,

for Xˆ2{\widehat{X}}_{2}, the mag­net­ic field, and for Xˆ1{\widehat{X}}_{1}, the imag­i­nary-valued pilot wave in green.

Dy­nam­i­cal­ly, the plot shows a prop­a­ga­tion con­sis­tent with elec­tro­mag­net­ic ra­di­a­tion, ev­i­denced by the trans­verse waves formed by the os­cil­la­tions of the real-valued X2X_{2} and X3X_{3} cosine wave­forms, which are per­pen­dic­u­lar­ly ori­ent­ed to the di­rec­tion of travel. The red X3X_{3} cosine wave, we define to rep­re­sent the elec­tric field EE, and the blue X2X_{2} cosine wave, the mag­net­ic field BB. In this ideal system, we find that these EE and BB fields are in phase syn­chrony, where they reach maxima and minima at the same points in space along the X1X_{1}-axis, and are in a fixed ratio of strength, all con­sis­tent with Maxwell's equa­tions in a dis­si­pa­tion-less system. In a region with­out charges or cur­rents, Maxwell's equa­tions in dif­fer­en­tial form reduce to the fol­low­ing

∇ ∙E=0,\begin{array}{r} \nabla\ \bullet E = 0, \end{array}
(1.8.15)
∇∙B=0,\begin{array}{r} \nabla \bullet B = 0, \end{array}
(1.8.16)
∇×E=−∂B∂t,\begin{array}{r} \nabla \times E = - \frac{\partial B}{\partial t}, \end{array}
(1.8.17)
∇×B=μ0ϵ0∂E∂t,\begin{array}{r} \nabla \times B = \mu_{0}\epsilon_{0}\frac{\partial E}{\partial t}, \end{array}
(1.8.18)

where ∇ ∙E\nabla\ \bullet E and ∇∙B\nabla \bullet B rep­re­sent the di­ver­gence of the elec­tric and mag­net­ic fields, which are zero in our ex­am­ple system, and ∇×E\nabla \times E and ∇×B\nabla \times B rep­re­sent the curl of the elec­tric and mag­net­ic fields. Math­e­mat­i­cal­ly, curl de­fines the in­fin­i­tes­i­mal ro­ta­tion of a vector field, while di­ver­gence de­fines the out­ward flux of a vector field as a volume den­si­ty. The uni­ver­sal con­stants μ0,ϵ0\mu_{0},\epsilon_{0} rep­re­sent the per­me­abil­i­ty of free space and the per­mit­tiv­i­ty of free space, which are re­lat­ed to the speed of light by the equal­i­ty

μ0ϵ0=1c2,\begin{array}{r} {\mu_{0}\epsilon}_{0} = \frac{1}{c^{2}}, \end{array}
(1.8.19)

and μ0ϵ0\mu_{0}\epsilon_{0} has the di­men­sions of (timelength)2.\left( \frac{time}{length} \right)^{2}.

In ad­di­tion to its con­sis­ten­cy with elec­tro­mag­net­ic ra­di­a­tion, what stands out about the flow­ing point system along the real-axis is the pres­ence of a pilot wave in the form of the isin(θ)isin(\theta) wave­form. This pilot wave has a di­rec­tion­al vector that sweeps back and forth as the flow­ing point trav­els in space, em­body­ing the math­e­mat­i­cal rep­re­sen­ta­tion of the non-com­pact Rie­mann sur­face for the imag­i­nary multi-valued por­tion of the X1X_{1}-axis func­tion. Its pres­ence forms a cen­tral crux of the quan­tum and wave­form dis­course we will un­der­take in the physics volume Arith­moí series, par­tic­u­lar­ly its ap­pli­ca­tion to hidden vari­ables.

The flow­ing point that trav­els along the real X1X_{1}-axis rep­re­sents only half of what the system com­pris­es, while the other half is its com­pan­ion wave trav­el­ing along the imag­i­nary X1X_{1}-axis.

Figure
Figure 1.8.5 – The flow­ing point com­pan­ion wave­forms, ori­ent­ed along the real X1X_{1}-axis, and the imag­i­nary X1X_{1}-axis.

As men­tioned in the pre­vi­ous sec­tion, per­ceived light in the elec­tro­mag­net­ic form moves about the axes and as­ymp­totes in com­plex space. This flow­ing point ex­am­ple moves along de­fined axes in com­plex space and is fit­ting for the manner in which light moves. When trav­el­ing along the axes, it does not ex­pe­ri­ence the hy­per­bol­ic geom­e­try that de­fines the space­time con­straints that mas­sive ob­jects ex­pe­ri­ence.