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Topic: Reversal symmetry

	Reversal symmetry - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-19)
		Reversal symmetry is a voting system criterion that is stated as follows: If a candidate A is the unique winner, and the individual preferences of each voter are inverted, then candidate A must not be elected.
		Methods that fail reversal symmetry include Bucklin voting, instant-runoff voting and Condorcet methods that fail the Condorcet loser criterion like Minimax.
		For cardinal voting systems which can be meaningfully reversed, approval voting and range voting satisfy the criterion.
	en.wikipedia.org /wiki/Reversal_symmetry (281 words)

	T-symmetry - Wikipedia, the free encyclopedia
		Experimentally observed bounds on the electric dipole moment of the nucleon currently set stringent limits on the violation of time reversal symmetry in the strong interactions, and their modern theory: quantum chromodynamics.
		This is formulated as a quantum field theory which has CPT symmetry, ie, the laws are invariant under simultaneous operation of time reversal, parity and charge conjugation.
		However, time reversal itself is seen not to be a symmetry (this is usually called CP violation).
	en.wikipedia.org /wiki/T-symmetry (2066 words)

	Charge, Parity, and Time Reversal (CPT) Symmetry
		The changes in symmetry properties can be thought of as "mirrors" in which some property of the nucleus (space, time, or charge) is reflected or reversed.
		Wu and her collaborators found that when a specific nucleus was placed in a magnetic field, electrons from the beta decay were preferentially emitted in the direction opposite that of the aligned angular momentum of the nucleus.
		If CPT symmetry is to be preserved, the CP violation must be compensated by a violation of time reversal invariance.
	www.lbl.gov /abc/wallchart/chapters/05/2.html (1109 words)

	Time-reversal symmetry
		Of course, this is not a spurious quirk of the mathematics we use, but a reflection of a deeper fact that by mixing the neutron and proton wave functions we introduce complex mixing coefficients that do affect the time-reversal properties of the mixed wave function.
		When no conserved symmetry is imposed, all densities are complex, and their real and imaginary parts are either symmetric or antisymmetric.
		On the other hand, as shown in Table 4, the general case corresponding to no conserved symmetries (e.g., for rotating states) requires that all the pn densities be complex.
	info.fuw.edu.pl /~dobaczew/nppair60w/node16.html (586 words)

	time
		When reading about time reversal symmetry, I become infuriated when authors confuse symmetry of the laws with symmetry of the state, and I am happy to report that not once did I hurl Zeh's book to the floor in anger.
		symmetry has so far only been seen in the decays of a single particle, the neutral kaon, and the amount of violation is minute.
		symmetry violation is not particularly related to the gross time asymmetry of the state of the universe.
	math.ucr.edu /home/baez/time/time.html (2018 words)

	Electric Dipole Moment of Ra-225 (Site not responding. Last check: 2007-10-19)
		The violation of time-reversal symmetry is among the most fundamental issues in physics.
		Here CP-reversal exchanges all the particles involved with their anti-particle partners and all the anti-particles with their particle partners, T-reversal reverses the direction of time, and CPT-reversal is the combination of CP-reversal and T-reversal.
		Under T-reversal, the spin direction reverses while the EDM direction remains the same, thus a particle that possesses both an EDM and a spin is converted into a different kind of particle, and T-symmetry is violated.
	www-mep.phy.anl.gov /atta/research/radiumedm.html (1572 words)

	CPT Invariance
		A symmetry in a physical experiment suggests that something is conserved, or remains constant, during the experiment.
		Reversing time also reverses the time derivatives of spatial quantities, so it reverses momentum and angular momentum.Newton's second law is quadratic in time and is invariant under time reversal.
		It is thought possible by some investigators that in CP violation is to be found the reason for the vast excess of matter over antimatter in the universe.
	hyperphysics.phy-astr.gsu.edu /hbase/particles/cpt.html (1069 words)

	RMK articles : Parity and Time-reversal Symmetry Breaking, Singular Solutions (Site not responding. Last check: 2007-10-19)
		Fresnel ray and wave surfaces are computed for systems that are not restricted to the topology imposed by the symmetries of the Lorentz transformations.
		The methods distinguish the measurable polarization phase differences between global behavior in optically active and Faraday media.
		In addition, an example is presented for which time-reversal and parity symmetries are broken: the inbound polarization states propagate with speeds different from the outbound polarization states.
	www22.pair.com /csdc/pd2/pd2fre10.htm (154 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		The applicability of time-reversal symmetry to nonlinear optics is discussed, both from macroscopic (Maxwell equations) and microscopic (quantum theoretical) point of view.
		We find that only spatial operations can be applied for the symmetry classification of nonlinear optical processes in magnetic, in particular antiferromagnetic materials.
		An example is given where both operations (time reversal and a spatial operation) can yield different results.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=20506542 (224 words)

	Symmetry Tests (Site not responding. Last check: 2007-10-19)
		Model analysis of time reversal symmetry test in the Fe-57 gamma transition experiment.
		Test of time reversal symmetry in the proton deuteron system.
		Model dependence of charge symmetry breaking in the neutron proton interaction.
	topas.physik2.uni-rostock.de /~beyer/symN.html (270 words)

	UK NLN #4: Time-Reversal Symmetry (Warwick) (Site not responding. Last check: 2007-10-19)
		The dynamical consequences of time-reversal symmetry in dynamical systems with discrete time (mappings) and continuous time (flows), with an emphasis on
		The workshop intends to bring together scientists from various branches of (applied) mathematics and (theoretical) physics who have been dealing with time-reversal symmetry in dynamical systems.
		and to highlight the use of time-reversal symmetry in applications, including e.g.
	www.amsta.leeds.ac.uk /Applied/news.dir/issue4/confs/time_reversal.html (149 words)

	Quantum Chaos Experiments with and without Time Reversal Symmetry (Site not responding. Last check: 2007-10-19)
		It has been predicted that in the semi-classical regime, the level statistics of a classical chaotic system corresponds to that of the Gaussian Unitary Ensemble (GUE) of random matrices when time reversal symmetry is broken.
		When a sufficiently large magnetic field is applied to the ferrite (thus breaking the time-reversal symmetry) good agreement with GUE statistics is obtained.
		The transition from GOE (which applies in the absence of the applied field) to GUE is also investigated.
	flux.aps.org /meetings/BAPSMAR95/abs/SI2002.html (143 words)

	Time-reversal symmetry and random polynomials
		The density of roots is shown to possess a singular component only in the case for which the phases increase linearly with the index of coefficients.
		This means that, contrary to earlier belief, eigenvectors of a typical quantum chaotic system with some antiunitary symmetry will not display a clustering curve in the stellar representation.
		Moreover, a class of time-reverse invariant quantum systems is shown, for which spectra display fluctuations characteristic of orthogonal ensemble, while eigenvectors confer to predictions of unitary ensemble.
	stacks.iop.org /0305-4470/30/L117 (258 words)

	Time-Reversal Symmetry in Dynamical Systems: A Survey - Lamb, Roberts (ResearchIndex) (Site not responding. Last check: 2007-10-19)
		If your firewall is blocking outgoing connections to port 3125, you can use these links to download local copies.
		Abstract: In this paper we survey the topic of time-reversal symmetry in dynamical systems.
		Area-Preserving Dynamics That is Not Reversible - Lamb (1995)
	citeseer.ist.psu.edu /590003.html (175 words)

	Time reversal symmetry-induced restrictions in polarization optics
		This paper is devoted to a theoretical analysis of the time reversal symmetry-induced restrictions on the polarization matrices representing the effect of deterministic, non-image-forming optical devices or scattering media which transform both the Jones vector and the Stokes vector.
		determined up to overall phase, arises as a direct consequence of time reversal symmetry.
		detection of broken time reversal symmetry in optical materials.
	stacks.iop.org /0963-9659/5/755 (265 words)

	Tests of Time Reversal Symmetry in the Deuteron (ResearchIndex) (Site not responding. Last check: 2007-10-19)
		Tests of Time Reversal Symmetry in the Deuteron (ResearchIndex)
		Abstract: : Internal target experiments with high quality proton beams allow for a new class of experiments providing null tests of time reversal symmetry in forward scattering.
		This could yield more stringent limits on T-odd P-even observables.
	citeseer.ist.psu.edu /122065.html (283 words)

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