172 research outputs found
'Universal' FitzGerald Contractions
The model of a universe with a preferred frame, which nevertheless shares the
main properties with traditional special and general relativity theories, is
considered. We adopt Mach's interpretation of inertia and show that the energy
balance equation, which includes the Machian energy of gravitational
interactions with the universe, can imitate standard relativistic formulas.Comment: The version accepted by Eur. Phys. J.
Constructing Exactly Solvable Pseudo-hermitian Many-particle Quantum Systems by Isospectral Deformation
A class of non-Dirac-hermitian many-particle quantum systems admitting
entirely real spectra and unitary time-evolution is presented. These quantum
models are isospectral with Dirac-hermitian systems and are exactly solvable.
The general method involves a realization of the basic canonical commutation
relations defining the quantum system in terms of operators those are hermitian
with respect to a pre-determined positive definite metric in the Hilbert space.
Appropriate combinations of these operators result in a large number of
pseudo-hermitian quantum systems admitting entirely real spectra and unitary
time evolution. Examples of a pseudo-hermitian rational Calogero model and XXZ
spin-chain are considered.Comment: To appear in the Special Issue PHHQP 2010, International Journal of
Theoretical Physics; 16 pages, LateX, no figur
Produção de fitomassa de diferentes espécies de cobertura e suas alterações na atividade microbiana de solo de cerrado
Tolerância à germinação na espiga em cultivares de trigo colhido na maturação fisiológica
Regeneração de plantas após fusão de protoplastos de tangelo 'Page' e toranja 'Lau Tau'
Relação do estado nutricional de minicepas com o enraizamento de miniestacas de eucalipto
Qualidade microbiológica e vida útil de filés defumados de tilápia-do-nilo sob refrigeração ou congelamento
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