Vacuum electromagnetic field correlations between two moving points
Pith reviewed 2026-05-18 17:32 UTC · model grok-4.3
The pith
Exact expressions are derived for the symmetrized quadratic electromagnetic field correlations seen by two accelerating points on a circular trajectory.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
We compute the exact main symmetrized quadratic electromagnetic field correlations between two points diametrically opposed on the same circular trajectory, with diameter r, covered at constant angular velocity Ω. We derive the expressions for the electromagnetic field correlations with itself and with its spatial derivatives, still at the locations of the moving points. Parallel exact computations are presented for electric field correlations between two points moving with opposite constant velocities on parallel trajectories and for self-correlations on the same moving point. Since the points accelerate, both the zero-point fluctuations and the blackbody spectrum produce non-trivial two- (
What carries the argument
Symmetrized quadratic electromagnetic field correlation functions in frequency space, obtained by applying special-relativistic Lorentz transformations to the vacuum field operators as seen from the frames of the moving points.
If this is right
- The correlations for circular motion acquire a periodic dependence on the angular velocity that is absent in the linear-motion case.
- Thermal blackbody contributions are modified by the acceleration, producing observable deviations from the static spectrum at any temperature.
- First-order expansions in Ωr/c supply simple analytic forms usable when the rotation is slow compared with c/r.
- Correlations involving spatial derivatives of the field yield the gradient fluctuations experienced at each moving location.
- Self-correlations at a single point exhibit frequency shifts and amplitude changes traceable to the relativistic transformation of the operators.
Where Pith is reading between the lines
- The same transformation method can be applied to predict how vacuum-induced forces or torques act on objects in steady circular motion.
- The expressions offer a concrete starting point for calculating decoherence or entanglement loss for quantum systems carried along the same trajectories.
- Numerical checks against finite-time simulations of the rotating case would test the validity of the relativistic operator mapping at higher orders in Ωr/c.
Load-bearing premise
The electromagnetic field operators transform according to ordinary special-relativistic rules even though the points accelerate, without extra model-dependent corrections for acceleration or finite size.
What would settle it
A direct measurement of the frequency spectrum of field noise or cross-correlations using two detectors placed diametrically opposite on a rotating platform at known angular speed Ω, compared with the closed-form expressions at several temperatures.
Figures
read the original abstract
A renewed experimental interest in quantum vacuum fluctuations brings back the need to extend the study of electromagnetic vacuum correlations. Quantum or semi-classical models developed to understand various configurations should combine the effects of the zero-point fluctuations with those of blackbody radiation. In this paper, after a brief historical introduction and a rapid study of the electric field correlations in time domain, we propose exact and approximate expressions for the vacuum field correlations in Fourier space seen by moving points. We first present an exact computation of the electric field correlations, expressed in frequency space, between two points moving with opposite constant velocities on parallel trajectories. We also consider the electric field self-correlations, i.e. on the same moving point but at different frequencies, and comment the results related to special relativity. Then, we compute the exact main symmetrized quadratic electromagnetic field correlations between two points diametrically opposed on the same circular trajectory, with diameter r, covered at constant angular velocity {\Omega}. We derive the expressions for the electromagnetic field correlations with itself and with its spatial derivatives, still at the locations of the moving points. Since the points we consider are accelerating, both the zero-point fluctuations and the blackbody spectrum give non-trivial results, for two-point correlations as well as for self-correlations. In both cases, results are shown at any vacuum temperature. For practical uses, we provide the first-order approximations in the small parameter {\Omega}r/c with c being the speed of light.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper claims to derive exact expressions for the symmetrized quadratic electromagnetic field correlations in the vacuum between two points moving with opposite constant velocities on parallel trajectories, and between two diametrically opposed points on a circular trajectory of diameter r at constant angular velocity Ω. It provides these correlations (including self-correlations and those involving spatial derivatives) in frequency space at the locations of the moving points, for any vacuum temperature, along with first-order approximations in the small parameter Ωr/c.
Significance. If the central derivations are correct, the work supplies useful analytic results for vacuum EM field correlations experienced by accelerating observers, extending studies of zero-point fluctuations and thermal spectra to circular motion. The exact expressions and small-parameter approximations could support modeling in quantum optics or precision experiments with moving systems.
major comments (1)
- [Circular trajectory calculations] Circular trajectory section (diametrically opposed points at constant Ω): The central claim of exact correlations 'seen by the moving points' rests on transforming Minkowski vacuum operators via special-relativistic boosts tied to instantaneous velocities. For non-inertial circular motion this risks omitting acceleration-dependent corrections (e.g., Fermi-Walker transport of the local tetrad or modifications to measured field components). An explicit verification that the boost-only procedure reproduces the full pulled-back two-point function, or a cross-check against known limits for circular trajectories, is required to support the exactness assertion.
minor comments (2)
- [Abstract] The abstract refers to a 'brief historical introduction and a rapid study of the electric field correlations in time domain' without section numbers; adding explicit references would improve readability.
- Notation for the symmetrized quadratic correlations and spatial derivatives should be defined explicitly at first use to avoid ambiguity when comparing self-correlations to two-point functions.
Simulated Author's Rebuttal
We thank the referee for their careful reading of the manuscript and for the constructive comment on the circular trajectory section. We address this point below.
read point-by-point responses
-
Referee: [Circular trajectory calculations] Circular trajectory section (diametrically opposed points at constant Ω): The central claim of exact correlations 'seen by the moving points' rests on transforming Minkowski vacuum operators via special-relativistic boosts tied to instantaneous velocities. For non-inertial circular motion this risks omitting acceleration-dependent corrections (e.g., Fermi-Walker transport of the local tetrad or modifications to measured field components). An explicit verification that the boost-only procedure reproduces the full pulled-back two-point function, or a cross-check against known limits for circular trajectories, is required to support the exactness assertion.
Authors: We thank the referee for highlighting this subtlety in the treatment of accelerating observers. In the manuscript, the electromagnetic field operators are those of the Minkowski vacuum, and the correlations are obtained by evaluating the two-point functions at the spacetime events along the worldlines of the two points and transforming the field components to the instantaneous rest frame of each observer via the Lorentz boost associated with its instantaneous velocity. This yields exact expressions for the symmetrized correlations in frequency space within the chosen framework. We agree, however, that a fully local measurement by an accelerating observer requires a consistently transported tetrad (e.g., Fermi-Walker) to define the measured field components without introducing fictitious effects from the choice of frame. To address the concern, we will add a clarifying paragraph in the revised manuscript that explicitly states the procedure, distinguishes lab-frame versus proper-frame quantities, and includes a consistency check by recovering the known Unruh spectrum in the appropriate linear-acceleration limit. This addition will strengthen the presentation of the exact results without changing the derivations themselves. revision: yes
Circularity Check
No significant circularity; derivations are direct analytic computations from standard vacuum QED
full rationale
The paper computes exact symmetrized quadratic electromagnetic field correlations for points on circular trajectories by starting from the standard Minkowski vacuum state of the electromagnetic field and applying special-relativistic transformations to the field operators at the locations of the moving points. No parameters are fitted to subsets of data and then relabeled as predictions, no load-bearing uniqueness theorems or ansatze are imported via self-citation, and the central expressions for two-point correlations, self-correlations, and spatial derivatives are obtained by explicit integration over modes rather than by algebraic rearrangement of the inputs. The derivation chain remains self-contained against external benchmarks such as the known vacuum two-point function in inertial frames.
Axiom & Free-Parameter Ledger
axioms (2)
- domain assumption Standard quantum vacuum state of the electromagnetic field (zero-point fluctuations plus thermal blackbody spectrum)
- domain assumption Special-relativistic transformation rules for electromagnetic field operators under constant-velocity and uniform circular motion
Lean theorems connected to this paper
-
IndisputableMonolith/Foundation/RealityFromDistinction.leanreality_from_one_distinction unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
We compute the exact main symmetrized quadratic electromagnetic field correlations between two points diametrically opposed on the same circular trajectory, with diameter r, covered at constant angular velocity Ω. We derive the expressions for the electromagnetic field correlations with itself and with its spatial derivatives, still at the locations of the moving points.
-
IndisputableMonolith/Foundation/ArrowOfTime.leanarrow_from_z echoes?
echoesECHOES: this paper passage has the same mathematical shape or conceptual pattern as the Recognition theorem, but is not a direct formal dependency.
Since the points we consider are accelerating, both the zero-point fluctuations and the blackbody spectrum give non-trivial results, for two-point correlations as well as for self-correlations.
What do these tags mean?
- matches
- The paper's claim is directly supported by a theorem in the formal canon.
- supports
- The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
- extends
- The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
- uses
- The paper appears to rely on the theorem as machinery.
- contradicts
- The paper's claim conflicts with a theorem or certificate in the canon.
- unclear
- Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.
Reference graph
Works this paper leans on
-
[1]
author author P. W. \ Milonni ,\ @noop title The quantum vacuum: an introduction to quantum electrodynamics \ ( publisher Academic press ,\ year 1994 ) NoStop
work page 1994
-
[2]
author author C. Riek , author D. V. \ Seletskiy , author A. S. \ Moskalenko , author J. F. \ Schmidt , author P. Krauspe , author S. Eckart , author S. Eggert , author G. Burkard , \ and\ author A. Leitenstorfer ,\ title title Direct sampling of electric-field vacuum fluctuations , \ 10.1126/science.aac9788 journal journal Science \ volume 350 ,\ pages 4...
-
[3]
author author I.-C. \ Benea-Chelmus , author F. F. \ Settembrini , author G. Scalari , \ and\ author J. Faist ,\ title title Electric field correlation measurements on the electromagnetic vacuum state , \ @noop journal journal Nature \ volume 568 ,\ pages 202--206 ( year 2019 ) NoStop
work page 2019
-
[4]
author author H. A. \ Bethe ,\ title title The electromagnetic shift of energy levels , \ 10.1103/PhysRev.72.339 journal journal Physical Review \ volume 72 ,\ pages 339--341 ( year 1947 ) NoStop
-
[5]
author author H. B. \ Casimir ,\ title title On the attraction between two perfectly conducting plates , \ in\ @noop booktitle Proc. Kon. Ned. Akad. Wet. ,\ Vol. volume 51 \ ( year 1948 )\ p.\ pages 793 NoStop
work page 1948
-
[6]
author author G. Menezes \ and\ author N. F. \ Svaiter ,\ title title Vacuum fluctuations and radiation reaction in radiative processes of entangled states , \ @noop journal journal Physical Review A \ volume 92 ,\ pages 062131 ( year 2015 ) NoStop
work page 2015
-
[7]
Pozas-Kerstjens \ and\ author E
author author A. Pozas-Kerstjens \ and\ author E. Mart\' n-Mart\' nez ,\ title title Entanglement harvesting from the electromagnetic vacuum with hydrogenlike atoms , \ 10.1103/PhysRevD.94.064074 journal journal Physical Review D \ volume 94 ,\ pages 064074 ( year 2016 ) NoStop
-
[8]
author author V. Dodonov ,\ title title Fifty years of the dynamical C asimir effect , \ 10.3390/physics2010007 journal journal Physics \ volume 2 ,\ pages 67--104 ( year 2020 ) NoStop
-
[9]
author author D. Reiche , author F. Intravaia , \ and\ author K. Busch ,\ title title Wading through the void: Exploring quantum friction and nonequilibrium fluctuations , \ 10.1063/5.0083067 journal journal APL Photonics \ volume 7 ,\ pages 030902 ( year 2022 ) NoStop
-
[10]
author author E. Fermi ,\ title title Quantum theory of radiation , \ 10.1103/RevModPhys.4.87 journal journal Reviews of Modern Physics \ volume 4 ,\ pages 87--132 ( year 1932 ) NoStop
-
[11]
author author F. Lindel , author A. M. \ Herter , author J. Faist , \ and\ author S. Y. \ Buhmann ,\ title title Probing vacuum field fluctuations and source radiation separately in space and time , \ 10.1103/PhysRevResearch.5.043207 journal journal Physical Review Research \ volume 5 ,\ pages 043207 ( year 2023 ) NoStop
-
[12]
author author J. Dalibard , author J. Dupont-Roc , \ and\ author C. Cohen-Tannoudji ,\ title title Vacuum fluctuations and radiation reaction: identification of their respective contributions , \ @noop journal journal Journal de Physique \ volume 43 ,\ pages 1617--1638 ( year 1982 ) NoStop
work page 1982
-
[13]
author author S. Y. \ Buhmann ,\ @noop title Dispersion Forces I: Macroscopic quantum electrodynamics and ground-state Casimir , Casimir--Polder and van der Waals forces \ ( publisher Springer ,\ year 2013 ) NoStop
work page 2013
-
[14]
author author M. Vaz , author S. Y. \ Buhmann , \ and\ author H. Bercegol ,\ @noop title Complete range of van der Waals attraction mediated by the quantum vacuum at all temperatures , \ ( year 2025 a ),\ note (to be submitted) NoStop
work page 2025
-
[15]
author author M. Vaz , author S. Y. \ Buhmann , \ and\ author H. Bercegol ,\ @noop title Quantum friction on a rotating pair of atomic oscillators at all temperatures and all distances , \ ( year 2025 b ),\ note (to be submitted)) NoStop
work page 2025
-
[16]
author author J. Larmor ,\ title title LXIII . On the theory of the magnetic influence on spectra; and on the radiation from moving ions , \ @noop journal journal The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science \ volume 44 ,\ pages 503--512 ( year 1897 ) NoStop
-
[17]
author author J. D. \ Jackson ,\ @noop title Classical electrodynamics \ ( publisher John Wiley & Sons ,\ year 1998 ) NoStop
work page 1998
-
[18]
author author N. Bohr ,\ title title I. O n the constitution of atoms and molecules , \ @noop journal journal The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science \ volume 26 ,\ pages 1--25 ( year 1913 ) NoStop
work page 1913
-
[19]
author author E. Schr \"o dinger ,\ title title An undulatory theory of the mechanics of atoms and molecules , \ @noop journal journal Physical Review \ volume 28 ,\ pages 1049 ( year 1926 ) NoStop
work page 1926
-
[20]
author author M. Planck ,\ title title On the law of distribution of energy in the normal spectrum , \ @noop journal journal Annalen der Physik \ volume 4 ,\ pages 1 ( year 1901 ) NoStop
work page 1901
-
[21]
author author A. Einstein ,\ title title On a heuristic point of view concerning the production and transformation of light , \ @noop journal journal Annalen der Physik \ volume 17 ,\ pages 1--16 ( year 1905 ) NoStop
work page 1905
-
[22]
author author P. A. M. \ Dirac ,\ title title The quantum theory of the emission and absorption of radiation , \ @noop journal journal Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character \ volume 114 ,\ pages 243--265 ( year 1927 ) NoStop
work page 1927
-
[23]
author author W. E. \ Lamb \ and\ author R. C. \ Retherford ,\ title title Fine structure of the hydrogen atom by a microwave method , \ 10.1103/PhysRev.72.241 journal journal Physical Review \ volume 72 ,\ pages 241--243 ( year 1947 ) NoStop
-
[24]
author author S. K. \ Lamoreaux ,\ title title Demonstration of the C asimir force in the 0.6 to 6 µm range , \ 10.1103/PhysRevLett.78.5 journal journal Physical Review Letters \ volume 78 ,\ pages 5--8 ( year 1997 ) NoStop
-
[25]
author author F. London ,\ title title The general theory of molecular forces , \ @noop journal journal Transactions of the Faraday Society \ volume 33 ,\ pages 8b--26 ( year 1937 ) NoStop
work page 1937
-
[26]
author author H. B. G. \ Casimir \ and\ author D. Polder ,\ title title The influence of retardation on the London-van der Waals forces , \ 10.1103/PhysRev.73.360 journal journal Physical Review \ volume 73 ,\ pages 360--372 ( year 1948 ) NoStop
-
[27]
author author A. D. \ McLachlan \ and\ author H. C. \ Longuet-Higgins ,\ title title Retarded dispersion forces in dielectrics at finite temperatures , \ 10.1098/rspa.1963.0115 journal journal Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences \ volume 274 ,\ pages 80--90 ( year 1963 ) NoStop
-
[28]
author author A. Einstein \ and\ author L. Hopf ,\ title title Statistische untersuchung der bewegung eines resonators in einem strahlungsfeld , \ https://doi.org/10.1002/andp.19103381604 journal journal Annalen der Physik \ volume 338 ,\ pages 1105--1115 ( year 1910 ) NoStop
-
[29]
author author V. Mkrtchian , author V. A. \ Parsegian , author R. Podgornik , \ and\ author W. M. \ Saslow ,\ title title Universal thermal radiation drag on neutral objects , \ @noop journal journal Physical review letters \ volume 91 ,\ pages 220801 ( year 2003 ) NoStop
work page 2003
-
[30]
author author G. ach , author M. DeKieviet , \ and\ author U. D. \ Jentschura ,\ title title Enhancement of blackbody friction due to the finite lifetime of atomic levels , \ @noop journal journal Physical Review Letters \ volume 108 ,\ pages 043005 ( year 2012 ) NoStop
work page 2012
-
[31]
author author X. Guo , author K. A. \ Milton , author G. Kennedy , author W. P. \ McNulty , author N. Pourtolami , \ and\ author Y. Li ,\ title title Energetics of quantum vacuum friction: Field fluctuations , \ 10.1103/PhysRevD.104.116006 journal journal Physical Review D \ volume 104 ,\ pages 116006 ( year 2021 ) NoStop
-
[32]
author author K. Sinha \ and\ author P. W. \ Milonni ,\ title title Dipoles in blackbody radiation: momentum fluctuations, decoherence, and drag force , \ 10.1088/1361-6455/ac8efe journal journal Journal of Physics B: Atomic, Molecular and Optical Physics \ volume 55 ,\ pages 204002 ( year 2022 ) NoStop
-
[33]
author author S. Popescu , author A. J. \ Short , \ and\ author A. Winter ,\ title title Entanglement and the foundations of statistical mechanics , \ @noop journal journal Nature Physics \ volume 2 ,\ pages 754--758 ( year 2006 ) NoStop
work page 2006
-
[34]
author author R. Kubo ,\ title title The fluctuation-dissipation theorem , \ 10.1088/0034-4885/29/1/306 journal journal Reports on Progress in Physics \ volume 29 ,\ pages 255 ( year 1966 ) NoStop
-
[35]
author author H. B. \ Callen \ and\ author T. A. \ Welton ,\ title title Irreversibility and generalized noise , \ 10.1103/PhysRev.83.34 journal journal Physical Review \ volume 83 ,\ pages 34--40 ( year 1951 ) NoStop
-
[36]
author author R. J. \ Glauber ,\ title title Coherent and incoherent states of the radiation field , \ @noop journal journal Physical Review \ volume 131 ,\ pages 2766 ( year 1963 ) NoStop
work page 1963
-
[37]
author author J. Von Neumann ,\ @noop title Mathematical foundations of quantum mechanics: New edition \ ( publisher Princeton university press ,\ year 2018 ) NoStop
work page 2018
-
[38]
author author V. Fock ,\ title title Konfigurationsraum und zweite quantelung , \ @noop journal journal Zeitschrift f \"u r Physik \ volume 75 ,\ pages 622--647 ( year 1932 ) NoStop
work page 1932
-
[39]
author author C. Cohen-Tannoudji , author B. Diu , \ and\ author F. Lalo \"e ,\ @noop title Quantum mechanics, Vol. 3: fermions, bosons, photons, correlations, and entanglement \ ( publisher John Wiley & Sons ,\ year 2019 ) NoStop
work page 2019
-
[40]
author author A. S. \ Wightman ,\ title title Quantum field theory in terms of vacuum expectation values , \ @noop journal journal Physical Review \ volume 101 ,\ pages 860 ( year 1956 ) NoStop
work page 1956
-
[41]
author author R. F. \ Streater \ and\ author A. S. \ Wightman ,\ @noop title PCT, spin and statistics, and all that ,\ Vol. volume 30 \ ( publisher Princeton University Press ,\ year 2000 ) NoStop
work page 2000
-
[42]
author author G. W. \ Ford ,\ title title The fluctuation–dissipation theorem , \ 10.1080/00107514.2017.1298289 journal journal Contemporary Physics \ volume 58 ,\ pages 244--252 ( year 2017 ) NoStop
-
[43]
author author K. A. \ Milton , author H. Day , author Y. Li , author X. Guo , \ and\ author G. Kennedy ,\ title title Self-force on moving electric and magnetic dipoles: Dipole radiation, Vavilov- C C erenkov radiation, friction with a conducting surface, and the einstein-hopf effect , \ 10.1103/PhysRevResearch.2.043347 journal journal Physical Review Res...
-
[44]
author author G. Ford \ and\ author R. O’Connell ,\ title title Lorentz transformation of blackbody radiation , \ @noop journal journal Physical Review E \ volume 88 ,\ pages 044101 ( year 2013 ) NoStop
work page 2013
-
[45]
author author M. Davidson ,\ title title Stochastic quantization of the electromagnetic field , \ @noop journal journal Journal of Mathematical Physics \ volume 22 ,\ pages 2588--2593 ( year 1981 ) NoStop
work page 1981
-
[46]
Barton ,\ title title On van der Waals friction: I
author author G. Barton ,\ title title On van der Waals friction: I. between two atoms , \ 10.1088/1367-2630/12/11/113044 journal journal New Journal of Physics \ volume 12 ,\ pages 113044 ( year 2010 ) NoStop
-
[47]
author author G. Barton ,\ title title On van der W aals friction between two atoms at nonzero temperature , \ @noop journal journal New Journal of Physics \ volume 13 ,\ pages 043023 ( year 2011 ) NoStop
work page 2011
-
[48]
author author J. S. \ H ye \ and\ author I. Brevik ,\ title title Casimir friction force and energy dissipation for moving harmonic oscillators , \ @noop journal journal Europhysics Letters \ volume 91 ,\ pages 60003 ( year 2010 ) NoStop
work page 2010
-
[49]
author author J. S. \ H ye \ and\ author I. Brevik ,\ title title Casimir friction force and energy dissipation for moving harmonic oscillators. II , \ @noop journal journal The European Physical Journal D \ volume 61 ,\ pages 335--339 ( year 2011 a ) NoStop
work page 2011
-
[50]
author author J. S. \ H ye \ and\ author I. Brevik ,\ title title Casimir friction in terms of moving harmonic oscillators: Equivalence between two different formulations , \ @noop journal journal The European Physical Journal D \ volume 64 ,\ pages 1--3 ( year 2011 b ) NoStop
work page 2011
-
[51]
author author H. Bateman \ and\ author A. Erd \'e lyi ,\ @noop title Higher transcendental functions ,\ Vol. volume 2 \ ( publisher Mc Graw-Hill Book Company ,\ year 1953 ) NoStop
work page 1953
-
[52]
author author H. Bercegol \ and\ author R. Lehoucq ,\ title title Vacuum friction on a rotating pair of atoms , \ 10.1103/PhysRevLett.115.090402 journal journal Phys. Rev. Lett. \ volume 115 ,\ pages 090402 ( year 2015 ) NoStop
-
[53]
author author G. E. \ Andrews , author R. Askey , \ and\ author R. Roy ,\ @noop title Special functions \ ( publisher Cambridge university press Cambridge ,\ year 1999 ) NoStop
work page 1999
-
[54]
author author Y. L. \ Luke ,\ @noop title Special Functions and Their Approximations ,\ Vol. volume 1 \ ( publisher Academic press ,\ year 1969 ) NoStop
work page 1969
-
[55]
author author B.-N. \ Guo \ and\ author F. Qi ,\ title title On the W allis formula , \ @noop journal journal International Journal of Analysis and Applications \ volume 8 ,\ pages 30--38 ( year 2015 ) NoStop
work page 2015
discussion (0)
Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.