Published June 1979 | Version v1
Journal article Metadata-only

Theory of superfluidity

Creators

  • 1. Sao Paulo Univ. (Brazil). Inst. de Fisica

Description

A new description of superfluidity is proposed, based upon the fact that Bogolyubov'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. An attempt is made to understand Tisza's two-fluid model in terms of the MQWs, and it is conjectured that they play an important role in the motion of second. A qualitative prediction is also presented concerning the behavior of the 'phonon-roton' peak below 1.0K, and two experiments to look for MQWs are proposed. (Author)

Abstract (Portuguese)

A teoria da superfluidez de Bogolyubov descreve certas ondas quanticas macroscopicas (OQMs) de natureza topologica, que se movem no fluido a velocidades subsonicas e eram, ate o presente, desconhecidas. Com base nesse fato, propoe-se uma nova descricao da superfluidez. Procura-se entender o modelo dos dois fluidos de Tisza em termos das OQMs, e conjectura-se que elas desempenham um papel importante no movimento do segundo som. Faz-se tambem uma previsao a respeito do comportamento do pico de fonons-rotons abaixo de 1,0K, e propoem-se duas experiencias para procurar OQMs. (Autor)

Additional details

Publishing Information

Journal Title
Rev. Bras. Fis.
Journal Volume
9
Journal Issue
2
Series
Rev. Bras. Fis.
Journal Page Range
375-445
ISSN
0374-4922

INIS

Country of Publication
Brazil
Country of Input or Organization
Brazil
INIS RN
11550758
Subject category
S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
BOGOLYUBOV METHOD; BOHR THEORY; BOUND STATE; CHARGE DENSITY; DISPERSION RELATIONS; EQUATIONS OF MOTION; EXCITATION; GRAPHS; HELIUM 4; LAMBDA POINT; PHI4-FIELD THEORY; PHONONS; ROTONS; SECOND SOUND; SUPERFLUIDITY; THEORETICAL DATA; TOPOLOGY; ULTRALOW TEMPERATURE; VARIATIONAL METHODS; WAVE PROPAGATION
Descriptors DEC
DATA; DATA FORMS; DIFFERENTIAL EQUATIONS; ENERGY-LEVEL TRANSITIONS; EQUATIONS; EVEN-EVEN NUCLEI; FIELD THEORIES; HELIUM ISOTOPES; INFORMATION; ISOTOPES; LIGHT NUCLEI; MATHEMATICS; NUCLEI; NUMERICAL DATA; PHYSICAL PROPERTIES; QUANTUM FIELD THEORY; QUASI PARTICLES; STABLE ISOTOPES; THERMODYNAMIC PROPERTIES; TRANSITION TEMPERATURE