--- { "category": "Metrology & Kinematics", "chapter": "Chapter 1", "template": "theory", "version": "1.1.0", "date_published": "2026-09-13", "updated": "2026-10-24", "canonical": true, "source_tier": "canonical", "theory_status": "DERIVED", "module_key": "lve", "module_navigation": [ { "path": "/en/theory/lve", "label": "Overview", "en": "Overview" }, { "path": "/en/theory/lve/derivation", "label": "Derivation", "en": "Derivation" }, { "path": "/en/theory/lve/physical-meaning", "label": "Physical Meaning", "en": "Physical Meaning" }, { "path": "/en/theory/lve/tests", "label": "Tests", "en": "Tests" } ], "source_chapter": "Chapter 1", "source_version": "ASD-BOOK-ddbade997b45", "source_sha256": "dace8ff491b4e4ae8a59b2b98e2a6c9c10e689079021ce0bc117985baba68e86", "last_reviewed": "2026-09-13", "open_problems": [ "/open-problems/master-equation", "/open-problems/lve-muon-decay" ], "sources": [ { "label": "Final combined manuscript — adopted scope documented on this page", "kind": "final-combined-manuscript", "url": "/downloads/ASD_Final_Manuscript_Source_Manifest.json" }, { "label": "Previous source: Anisotropic Space Dynamics, final Chinese Chapter 1 (supplied manuscript, 23 pages)", "kind": "historical-source" } ], "id": "ASD-DOC-THEORY-LVE-PHYSICAL-MEANING-EN", "path": "/en/theory/lve/physical-meaning", "title": "Length Vector Effect · Physical Meaning", "title_en": "Length Vector Effect · Physical Meaning", "summary": "True length, wavelength and elapsed process time in ASD: shared mathematical forms, distinct physical claims and the conditions for observable differences.", "evidence_status": "UNTESTED", "equation": "lve-wavelength", "depends_on": [ "/en/theory/lve" ], "related": [ "/en/theory/lve", "/en/theory/lve/derivation", "/en/theory/lve/tests" ], "equations": [ "lve", "lve-wavelength", "lve-frequency" ], "source_reference": "Chapter 1 §§II–IV, Eqs. (1.13), (1.17)–(1.25)", "comparison": [ { "aspect": "Starting point", "established": "The relativity principle, invariant vacuum light speed and operational synchronization; Lorentz transformations in standard inertial coordinates.", "asd": "Modern measurement relations and directional realization of length by light propagation, followed by moving configurations and forward/reverse scale pairing." }, { "aspect": "Transverse scale", "established": "A standard Lorentz boost along x leaves y and z unchanged. Comparing actual lengths still requires a measurement procedure.", "asd": "Chapter 1 gives y′ = γy and z′ = γz, with transverse true scale L′⊥ = γL⊥. This physical claim is retained." }, { "aspect": "Origin of γ", "established": "Light-propagation conditions and the symmetry structure of the standard transformation determine the factor used in spacetime relations.", "asd": "The forward/reverse construction and inner-product pairing in Eqs. (1.7)–(1.9). The normalization conditions are specified on the derivation page." }, { "aspect": "Interpretation of time", "established": "A clock accumulates proper time along its worldline. Its relation to a specified coordinate time has observable consequences.", "asd": "Elapsed-time and frequency differences are attributed to effective path, wavelength and physical process-length changes, without dilation of time as an independent entity." }, { "aspect": "Ontology of space", "established": "A unified spacetime structure organizes distance, simultaneity, propagation and clock relations, without requiring an absolutely stationary material background.", "asd": "Directional response associated with motion is assigned to real spatial length relations. Its microscopic generating mechanism belongs to later space-dynamics research." }, { "aspect": "Possible experimental distinction", "established": "Predictions for time, frequency, phase or counts in the same apparatus provide the comparison baseline.", "asd": "Shared null differentials or frequency shifts do not distinguish ASD alone. Matched predictions for media, clock transport or decay are needed first." } ], "outline": [ "True Length", "Beyond Coordinates", "Transverse Scale", "Wavelength and Measurement", "Gamma and Process Time", "Established Framework vs ASD", "Agreement and Distinction", "Scope and Sources" ], "seo_title": "Length Vector Effect (LVE) — Physical Meaning | Anisotropic Space Dynamics", "canonical_url": "https://asd-physics.org/en/theory/lve/physical-meaning", "locale": "en", "mathematical_review": "CONDITIONAL", "review_path": "/en/theory/lve/derivation#review-notes", "translation_path": "/theory/lve/physical-meaning", "translation_of": "/theory/lve/physical-meaning", "translation_version": "1.1.0", "final_source": { "source_id": "ASD-BOOK-ddbade997b45", "chapter": "Chapter 1", "reference": "Chapter 1 §§II–IV, Eqs. (1.13), (1.17)–(1.25)", "locators": [ "p0309", "p0346", "p0348", "p0357", "p0360", "p0375", "p0391", "p0401", "p0502" ], "adopted_scope": "Model true length, directional scales, wavelength–frequency relation and process interpretation", "conditions": [ "The angle requires a specified reference description", "Instrument readings require a separate response mapping" ], "unresolved": [ "FINAL-CH1-PAIRING" ], "migration_status": "reviewed", "manuscript_sha256": "ddbade997b45913248e588953b1d27ccb9c7c206c3c8d992d3aef2364a64836e", "source_manifest": "final-manuscript-source-manifest.json", "body_review": "updated" }, "previous_source": { "source_chapter": "Chapter 1 · The Vector Effect of Length — From Constant Light Speed to Anisotropy of Moving Space", "source_reference": "Chapter 1, Section II, Sections 3.1 and 3.6, Section IV; PDF pp. 7–11 and 19–22", "source_version": "CH1-caf38018fc5a", "source_sha256": "caf38018fc5aed65b6565668de0325599f46341fd7e893ea923571ac7c2e3961", "sources": [ { "label": "Anisotropic Space Dynamics, final Chinese Chapter 1 (supplied manuscript, 23 pages)", "kind": "supplied-final-manuscript" } ] }, "source_kind": "manifest", "source_records": [ { "id": "ASD-BOOK-ddbade997b45", "title": "各向异性空间动力学（最终合订稿）", "filename": "各向异性空间动力学.docx", "format": "docx", "size_bytes": 503564, "sha256": "ddbade997b45913248e588953b1d27ccb9c7c206c3c8d992d3aef2364a64836e" } ], "source_manifest": "final-manuscript-source-manifest.json", "source_manifest_url": "/downloads/ASD_Final_Manuscript_Source_Manifest.json" } --- ## True Length The physical claim of LVE is a rearrangement of spatial scales associated with motion: co-directional, counter-directional and transverse effective lengths follow one directional relation. The transverse factor is not an isolated correction assigned to one instrument. Chapter 1 then identifies a one-period propagation length with wavelength and obtains a frequency relation; Chapters 2 and 3 add the dynamical constitutive inputs for inertia, gravity and Coulomb interaction. ASD uses “true length” for the real length relation of a physical spatial process in a specified state of motion and direction. A measurement reading realizes that relation through a rod, light propagation or a physical period. The reading, the standard used to realize it and the spatial relation being measured must be identified separately. “True length” is an ASD model term. It is not silently equated with the VIM concept of a “true quantity value,” nor can it be measured directly and unconditionally without a model of the standard's response. [Metrological Foundations](/en/theory/metrology#common-length-principle) distinguishes model length, quantity value and instrument indication. In the transverse case, $L_\perp$ is the reference scale and $L'_\perp$ is the true scale associated with motion as defined by ASD: The prime does not automatically mean “the number any moving observer reads with their own rod.” A predicted reading still requires specification of what moves, the measurement direction, the emission and reception events, and the comparison standard. The formal claim in Chapter 1 is that spatial length relations have this physical directional response. ## Beyond Coordinates Changing coordinates can change an object's numerical representation without introducing an additional physical mechanism. ASD makes a more specific interpretive claim here: spatial length, propagation paths and physical process scales undergo directional changes associated with motion. The question therefore includes what physical lengths the quantities $x,y,z,t$ and their primed counterparts represent in measurement. The transverse relations $y'=\gamma y$, $z'=\gamma z$ in Chapter 1 cannot be replaced by the standard SR relations $y'=y$, $z'=z$. This distinction does not reduce SR to a coordinate technique. SR makes definite physical predictions about clocks, proper time and observable processes. Comparison with ASD should use matching operational definitions and final readings, rather than classifying one framework as “real” and the other as “unreal.” ## Transverse Scale “Transverse” is defined relative to the specified velocity $\mathbf v$. When the measurement direction is perpendicular to the motion, the $\cos\phi$ term in the general relation vanishes, leaving $\gamma$. At nonzero speed this factor exceeds 1. The transverse expression cannot be applied to every direction. Substitution in manuscript Eq. (1.13) gives: $$ \frac{r'}r= \begin{cases} \sqrt{(1-\beta)/(1+\beta)},&\phi=0,\\ \gamma,&\phi=\pi/2,\\ \sqrt{(1+\beta)/(1-\beta)},&\phi=\pi. \end{cases} $$ These are three substitutions into the manuscript's general expression, not additional numbered formulas from the book. Under the chapter's convention for the direction of observer motion, co-directional, transverse and counter-directional cases have different factors. The rotating-loop section changes the description of which object moves; its angles and signs must be checked before applying the expression. The [LVE overview schematic](/en/theory/lve#interactive) depicts the scale relation. Its wireframe is not a microscopic model of space. ## Wavelength and Measurement
Chapter 1 treats wavelength as propagation length over one period. For period $T$, $\lambda=cT$. Section III sets $\lambda=r$ to apply the general directional length relation to wavelength: The same vacuum propagation relation requires $\lambda'f'=\lambda f=c$. To retain the full connection from Eqs. (1.23) to (1.25), first substitute the wavelength relation: $$ \lambda\gamma(1-\beta\cos\phi)f'=\lambda f, \qquad f=f'\gamma(1-\beta\cos\phi). $$ Hence: For the manuscript's case $\phi=\pi/2$, $\lambda'=\gamma\lambda$ and $f'=f/\gamma$. ASD interprets this frequency change through a change in wavelength as a real length quantity, rather than through dilation of time as an independent entity. A frequency reading results from specific emission, reception and counting procedures. In particular, **the reference description in which “transverse” is defined must be stated**. Angles in different frames are not interchangeable. Matching Doppler forms can be compared only after the source, receiver and angle definitions are aligned. Chapter 1 does not provide a complete cross-framework mapping at arbitrary angles; that task is retained on the [tests page](/en/theory/lve/tests#lve-test-doppler). ## Gamma and Process Time In ASD, $\gamma$ is the scale factor obtained from the manuscript's forward/reverse measurement construction and pairing condition. It subsequently enters directional lengths, transverse scales, wavelengths and elapsed process times. See the [intermediate derivation steps](/en/theory/lve/derivation#s3). Chapter 1 uses $S=vt$ and, at constant speed, $T=L/v$ to emphasize the connection between time readings and physical processes. In its interpretation, if the specified speed remains fixed while the effective process length changes, the elapsed-time reading changes accordingly. This is not attributed to a change in “time itself” as an independent entity. The interpretation must be connected to actual clocks. Light-propagation periods, particle decay and atomic-clock readings are not automatically described in full by the same path formula. Chapter 1 gives transported-clock and particle applications, but trajectories, counting processes and statistical quantities still need to be specified before comparison with standard calculations for the same experiments. ## Established Framework vs ASD This comparison concerns standard uniform inertial configurations and LVE in Chapter 1, rather than the entirety of either framework. The SR column follows the measurement definitions, transformations and kinematics in Einstein's 1905 paper; the ASD column follows Chapter 1, Sections II–IV. Standard reference: [Einstein, On the Electrodynamics of Moving Bodies, Sections 1–4 and 7](https://www.fourmilab.ch/etexts/einstein/specrel/www/). This source describes SR for comparison; it does not replace the ASD derivation. ## Agreement and Distinction Identical mathematical forms can carry different physical interpretations. Chapter 1, for example, attributes the transverse frequency factor to wavelength change. An ideal equal-arm experiment can also yield zero differential delay in different frameworks. Such shared observables alone cannot select an ontology of space. The substantive differences around LVE have three separable levels: the **starting point**, using directional measurement processes to establish moving scales; the **physical interpretation**, assigning the transverse factor to real spatial length; and the **experimental prediction**, whether the same apparatus and inputs lead to different readings. The first two differences are explicit in Chapter 1. The third requires an apparatus-specific calculation and cannot be inferred from two isolated length formulas. ASD accepts existing observations and interprets them through its length–process framework. This website does not present interpretive differences as an overthrow of SR, or applications lacking a quantitative correspondence as verified results. ## Scope and Sources This page preserves Chapter 1's claims about true length, wavelength and time interpretation without repeating the full derivation. How microscopic dynamics generate spatial anisotropy belongs to subsequent work on [space dynamics](/en/theory/space-dynamics) and the [master equation](/en/open-problems/master-equation). Emission–reception correspondence at arbitrary directions, a joint model of measuring rods and process scales, transported-clock readings and decay survival probabilities are the next requirements for turning interpretation into distinguishable predictions. Mathematical conditions on the core formula are collected in the [derivation review](/en/theory/lve/derivation#review-notes). [Experimental Relations and Tests →](/en/theory/lve/tests)