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AbstractAbstract
[en] A new description of superfluidity is proposed, based upon the fact that Bogoliubov's theory of superfluidity exhibits some so far unsuspected macroscopic quantum waves (MQWs), which have a topological nature and travel within the fluid at subsonic velocities. To quantize the bounded quasi-particles the field theoretic version of the Bohr-Sommerfeld quantization rule, is employed and also resort to a variational computation. In an instantaneous configuration the MQWs cut the condensate into blocks of phase, providing, by analogy with ferromagnetism, a nice explanation of what could be the lambda-transition. A crude estimate of the critical temperature gives T sub(c) approximately equal to 2-4K. An attempt is made to understand Tisza's two-fluid model in terms of the MQWs, and we rise the conjecture that they play an important role in the motion of second. We present also a qualitative prediction concerning to the behavior of the 'phononroton' peak below 1.0K, and propose two experiments to look for MQWs
[pt]
Propoe-se uma nova descricao de superfluidez baseado no fato de que a teoria de superfluidez de Bogoliubov's exibe algumas ondas quanticas macroscopicas (MQWs) ate aqui insuspeitadas, que tem uma natureza topologica e se deslocam dentro do fluido em velocidades subsonicas. Para quantizar as quasi-particulas ligadas emprega-se a versao teorica de campo da regra de quantizacao de Bohr-Sommerfeld, e tambem recorre-se a uma computacao variacional. Numa configuracao instantanea as 'MQWs' cortam, o condensado em blocos de fase, dando por analogia com o ferromagnetismo, uma boa explicacao do que poderia ser a transicao lambda. Uma estimativa grosseira da temperatura critica da T sub(c) aproximadamente igual a 2-4K. Faz-se tentativa para compreender o modelo de dois fluidos de Tisza em termos das 'MQWs', e conjectura-se que ele tem um importante papel no movimento de segundo som. Apresenta-se tambem uma previsao qualitativa acerca do comportamento do pico do 'phonon-roton' abaixo de 1.0K, e propoe-se dois experimentos para procurar 'MQWs'Primary Subject
Source
Oct 1978; 105 p
Record Type
Report
Literature Type
Numerical Data
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BOHR THEORY, BOUND STATE, CRITICAL TEMPERATURE, DISPERSION RELATIONS, ENERGY SPECTRA, EQUATIONS OF MOTION, EXCITATION, GRAPHS, HELIUM II, LANDAU LIQUID HELIUM THEORY, LANDAU QUASI PARTICLES, PHI4-FIELD THEORY, PHONONS, SECOND SOUND, SEMICLASSICAL APPROXIMATION, STATISTICAL MECHANICS, SUPERFLUIDITY, THEORETICAL DATA, ULTRALOW TEMPERATURE, VARIATIONAL METHODS, ZERO SOUND
DATA, DATA FORMS, DIFFERENTIAL EQUATIONS, ENERGY-LEVEL TRANSITIONS, EQUATIONS, EVEN-EVEN NUCLEI, FIELD THEORIES, HELIUM 4, HELIUM ISOTOPES, INFORMATION, ISOTOPES, LIGHT NUCLEI, MECHANICS, NUCLEI, NUMERICAL DATA, PHYSICAL PROPERTIES, QUANTUM FIELD THEORY, QUASI PARTICLES, SPECTRA, STABLE ISOTOPES, THERMODYNAMIC PROPERTIES, TRANSITION TEMPERATURE
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