39 research outputs found
Electrodynamics with a Future Conformal Horizon
We investigate the impact of singularities occurring at future times in
solutions of the Friedmann equations expressed in conformal coordinates. We
focus on the consequences of extending the time coordinate through the
singularity for the physics of matter and radiation occupying just one side.
Mostly this involves investigation of the relationship between the metric with
line element ds^2 = a^2(t) * (dt^2 - dx^2) and time reversal symmetry within
electrodynamics. It turns out compatibility between these two is possible only
if there is a singular physical event at the time of the singularity or if the
topology is not trivial. In both cases the singularity takes on the appearance
of a time-like mirror. We are able to demonstrate a relationship between the
broken time symmetry in electrodynamics characterized by retarded radiation and
radiation reaction and the absolute conformal time relative to the time of the
singularity, i.e. between the Electromagnetic and Cosmological arrows of time.
It is determined that the Wheeler-Feynman reasoning but with the future
absorber replaced by the Cosmological mirror leads to a conflict with
observation unless matter is electromagnetically strongly bound to the
environment.Comment: Article to be published in 7th International Vigier Symposium: The
Search for Fundamental Theor
Bezmasena klasiÄna elektrodinamika
In the direct-action form of classical electromagnetism we give the equation of motion for a classical massless bare charge without self-interaction in the presence of an external field. That equation permits superluminal speeds and time-reversals, and so is a realization of the Stueckelberg-Feynman view of electrons and positrons as different segments of a single trajectory. We give a particular solution to a one body problem, and briefly discuss some aspects of the two-body problem. There is some discussion of the historical context of this effort, including the direct action and absorber theories, and some speculation on how the massless bare charge may acquire mass, and how these findings impact the problem of singular self-action.U okviru klasiÄne elektrodinamike s izravnim djelovanjem izvodimo jednadžbu gibanja za klasiÄan bezmaseni naboj bez samodjelovanja u prisutnosti vanjskog polja. Ta jednadžba dopuÅ”ta nadsvjetlosne brzine i obrat vremena te predstavlja ostvarenje Stueckelbergove i Feynmanove zamisli elektrona i pozitrona kao razliÄitih odsjeÄaka jedne putanje. Izvodi se rjeÅ”enje za poseban zadatak gibanja jedne Äestice i kratko raspravljaju neka pitanja sustava dva tijela. Daje se povijesni osvrt na te pokuÅ”aje, ukljuÄivÅ”i teorije izravnog djelovanja i apsorpcije, kao i neka razmiÅ”ljanja kako bi goli naboj mogao dobiti masu, te kako postignuti rezultati promiÄu zadatak samodjelovanja izdvojene Äestice
Bezmasena klasiÄna elektrodinamika
In the direct-action form of classical electromagnetism we give the equation of motion for a classical massless bare charge without self-interaction in the presence of an external field. That equation permits superluminal speeds and time-reversals, and so is a realization of the Stueckelberg-Feynman view of electrons and positrons as different segments of a single trajectory. We give a particular solution to a one body problem, and briefly discuss some aspects of the two-body problem. There is some discussion of the historical context of this effort, including the direct action and absorber theories, and some speculation on how the massless bare charge may acquire mass, and how these findings impact the problem of singular self-action.U okviru klasiÄne elektrodinamike s izravnim djelovanjem izvodimo jednadžbu gibanja za klasiÄan bezmaseni naboj bez samodjelovanja u prisutnosti vanjskog polja. Ta jednadžba dopuÅ”ta nadsvjetlosne brzine i obrat vremena te predstavlja ostvarenje Stueckelbergove i Feynmanove zamisli elektrona i pozitrona kao razliÄitih odsjeÄaka jedne putanje. Izvodi se rjeÅ”enje za poseban zadatak gibanja jedne Äestice i kratko raspravljaju neka pitanja sustava dva tijela. Daje se povijesni osvrt na te pokuÅ”aje, ukljuÄivÅ”i teorije izravnog djelovanja i apsorpcije, kao i neka razmiÅ”ljanja kako bi goli naboj mogao dobiti masu, te kako postignuti rezultati promiÄu zadatak samodjelovanja izdvojene Äestice
The Dirac Field at the Future Conformal Singularity
We examine in detail the effect of the conformal factor associated with the
Friedmann-Robertson-Walker spacetimes on the discrete symmetries usually
present in the Dirac theory and analyze the behavior of the Dirac wavefunction
near the future conformal singularity. We find that only two of the 4 bi-spinor
components survive to the boundary, one effect of which is to cause the
geodesics to experience a drag towards the Hubble frame. We then present
arguments for the existence of a genuine boundary condition on the wavefunction
at the future conformal singularity based upon the assumption there is no
redundant copy of the universe in the post-conformal singularity era. This
future boundary condition affects the spectral decomposition of the
wavefunction, and this maybe locally testable at the present time
MASSLESS CLASSICAL ELECTRODYNAMICS
In the direct action form of classical EM we give the equation of motion for a classical massless bare charge without self-interaction in the presence of an external field. That equation permits superluminal speeds and time-reversals, and so is a realization of the Stueckelberg-Feynman view of electrons and positrons as different segments of a single trajectory. We give a particular solution to a one body problem, and briefly discuss some aspects of the two-body problem. There is some discussion of the historical context of this effort, including the direct action and absorber theories, and some speculation on how the massless bare charge may acquire mass, and how these findings impact the problem of singular self-action. PACS numbers
Un-renormalized Classical Electromagnetism
This paper follows in the tradition of direct-action versions of
electromagnetism having the aim of avoiding a balance of infinities wherein a
mechanical mass offsets an infinite electromagnetic mass so as to arrive at a
finite observed value. Given that, in this respect the direct-action approached
ultimately failed because its initial exclusion of self-action was found to be
untenable in the relativistic domain, this paper continues the tradition
considering instead a version of electromagnetism wherein mechanical action is
excluded and self-action is retained. It is shown that the resulting theory is
effectively interacting due to the presence of infinite forces. A vehicle for
the investigation is a pair of classical point charges in a positronium-like
arrangement for which the orbits are found to be self-sustaining and naturally
quantized