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Spacetime algebra and electron physics
 Advances in Imaging and Electron Physics
, 1996
"... This paper surveys the application of geometric algebra to the physics of electrons. It first appeared in 1996 and is reproduced here with only minor modifications. Subjects covered include nonrelativistic and relativistic spinors, the Dirac equation, operators and monogenics, the Hydrogen atom, pr ..."
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Cited by 14 (8 self)
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This paper surveys the application of geometric algebra to the physics of electrons. It first appeared in 1996 and is reproduced here with only minor modifications. Subjects covered include nonrelativistic and relativistic spinors, the Dirac equation, operators and monogenics, the Hydrogen atom, propagators and scattering theory, spin precession, tunnelling times, spin measurement, multiparticle quantum mechanics, relativistic multiparticle wave equations, and semiclassical mechanics.
Tests of a TwoPhoton Technique for Measuring Polarization Mode Dispersion with Subfemtosecond Precision
, 1999
"... this paper is to explore how crystal length and spectral passband affect the measurement uncertainty. ..."
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Cited by 1 (0 self)
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this paper is to explore how crystal length and spectral passband affect the measurement uncertainty.
Abnormal Wave Propagation in Passive Media
 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
, 2003
"... Abnormal velocities in passive structures such as onedimensional (1D) photonic crystals and a slab having a negative index of refraction are discussed. In the case of 1D photonic crystal, the frequency and timedomain experiments for waves tuned to the bandgap of the photonic crystal demonstrate ..."
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Cited by 1 (1 self)
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Abnormal velocities in passive structures such as onedimensional (1D) photonic crystals and a slab having a negative index of refraction are discussed. In the case of 1D photonic crystal, the frequency and timedomain experiments for waves tuned to the bandgap of the photonic crystal demonstrate a positive group velocity exceeding the speed of light in vacuum (superluminal). In the case of a medium with negative index of refraction, our theoretical studies show that such a medium can support positive group and negative phase velocities (backward waves), as well as negative group and negative phase velocities. The meaning of superluminal group velocity and negative group velocity, or equally, positive superluminal group delay and negative group delay, are discussed. It is shown that despite their counterintuitive meaning there are no contradictions with the requirements of relativistic causality (Einstein causality). To clearly demonstrate this, the important subject of the âfrontâ is reintroduced.
How events come into being: EEQT, particle tracks, quantum chaos and tunnelling time
 J. Mod. Opt
"... In sections 1 and 2 we review Event Enhanced Quantum Theory (EEQT). In section 3 we discuss applications of EEQT to tunneling time, and compare its quantitative predictions with other approaches, in particular with BüttikerLarmor and Bohm trajectory approach. In section 4 we discuss quantum chaos a ..."
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In sections 1 and 2 we review Event Enhanced Quantum Theory (EEQT). In section 3 we discuss applications of EEQT to tunneling time, and compare its quantitative predictions with other approaches, in particular with BüttikerLarmor and Bohm trajectory approach. In section 4 we discuss quantum chaos and quantum fractals resulting from simultaneous continuous monitoring of several noncommuting observables. In particular we show selfsimilar, nonlinear, iterated function systemtype, patterns arising from quantum jumps and from the associated Markov operator. Concluding remarks pointing to possible future development of EEQT are given in section 5. 1
Universal tunneling time for all fields
, 2008
"... Tunneling is probably the most important physical process. The observation that particles surmount a high mountain in spite of the fact that they don’t have the necessary energy can not be explained by classical physics. However, this so called tunneling became allowed by the theory of quantum mecha ..."
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Tunneling is probably the most important physical process. The observation that particles surmount a high mountain in spite of the fact that they don’t have the necessary energy can not be explained by classical physics. However, this so called tunneling became allowed by the theory of quantum mechanics. Experimental tunneling studies with different photonic barriers from microwave frequencies up to ultraviolet frequencies pointed toward a universal tunneling time [1, 2]. The observed results and calculations have shown that the tunneling time of opaque photonic barriers (for instance optical mirrors) equals approximately the reciprocal frequency of the electromagnetic wave in question. The tunneling process is described by virtual photons [3]. Virtual particles like photons or electrons are not observable. However, from the theoretical point of view, they represent necessary intermediate states between observable real states. In the case of tunneling there is a virtual particle between the incident and the transmitted particle. Tunneling modes have a
Faster than light in a birefringent crystal
, 710
"... We examine the effect of superluminal signal propagation through a birefringent crystal, where the effect is not due to absorption or reflection, but to the filtration of a special polarization component. We first examine the effect by a stationary phase analysis, with results consistent with those ..."
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We examine the effect of superluminal signal propagation through a birefringent crystal, where the effect is not due to absorption or reflection, but to the filtration of a special polarization component. We first examine the effect by a stationary phase analysis, with results consistent with those of an earlier analysis of the system. We supplement this analysis by considering the transit of a gaussian wave and find bounds for the validity of the stationary phase result. The propagation of the gaussian wave is illustrated by figures.
unknown title
, 2003
"... Light as a quantum fluid: a new quantization technique of optical fields based on Xwaves and its application to entanglement in parametric amplification ..."
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Light as a quantum fluid: a new quantization technique of optical fields based on Xwaves and its application to entanglement in parametric amplification
based on Xwaves and its application to entanglement
, 2003
"... Light as a quantum fluid: a new threedimensional quantization technique ..."
Superluminal transmission is possible from now on
, 2002
"... It is known that superluminal transmission of information and energy contradicts Einstein’s relativity. Here we announce an unusual TOE called ’nature theory ’ in which impossible things become possible. We present the scheme of an apparatus for sending signals over arbitrarily large distances with ..."
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It is known that superluminal transmission of information and energy contradicts Einstein’s relativity. Here we announce an unusual TOE called ’nature theory ’ in which impossible things become possible. We present the scheme of an apparatus for sending signals over arbitrarily large distances with speeds arbitrarily exceeding the light speed in vacuum. Introducing the notions of effective speed and reliability of superluminal devices, we encourage experimenters to set and break world records in this new branch. At the same time we outline a mechanism (termed ’particle encapsulation’) owing to which nature theory remains Lorentz invariant and so consistent with experiments. From among other numerous applications of nature theory we discuss briefly local antigravitation and new computing machines, called ’vacuum computers’, applying ’cat principle’. They are of great interest because should enable humans to overcome the GödelTuring barrier. 12 pages, 1 figure 1 In the celebrated 1905 paper [1] Einstein changed our approach to time and laid down a new foundation for all modern physical science. One of the
1 Negative Group Delay and Superluminal Propagation: An Electronic Circuit Approach
, 2003
"... Abstract—We present a simple electronic circuit which provides negative group delays for bandlimited, baseband pulses. It is shown that large time advancement comparable to the pulse width can be achieved with appropriate cascading of negativedelay circuits but eventually the outofband gain lim ..."
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Abstract—We present a simple electronic circuit which provides negative group delays for bandlimited, baseband pulses. It is shown that large time advancement comparable to the pulse width can be achieved with appropriate cascading of negativedelay circuits but eventually the outofband gain limits the number of cascading. The relations to superluminality and causality are also discussed. Index Terms—negative group delay, superluminal propagation, group velocity, filter, causality I.