{"title":"超流体被挤压到什么程度","authors":"N. Bogolubov, A. Shumovsky","doi":"10.2478/V10005-007-0016-9","DOIUrl":null,"url":null,"abstract":"We show that the Bogoliubov microscopic theory of superuidity of liquid 4 He allows quantum uctuations of both condensate and excitations. Comparison of those uctuations leads to an equation determining the mean number of atoms with zero momentum in a self-consistent way. Obtained results are in good agreement with the experiments on Bose-Einstein condensation in atomic beams. To explain experimental results on low amount of atoms in condensate in the superuid phase of liquid 4 He, we propose to consider the ground state of the condensate as a squeezed number state and discuss some corollaries coming from this conjecture.","PeriodicalId":249199,"journal":{"name":"Old and New Concepts of Physics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2007-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"TO WHAT EXTENT THE SUPERFLUID 4 He IS SQUEEZED\",\"authors\":\"N. Bogolubov, A. Shumovsky\",\"doi\":\"10.2478/V10005-007-0016-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We show that the Bogoliubov microscopic theory of superuidity of liquid 4 He allows quantum uctuations of both condensate and excitations. Comparison of those uctuations leads to an equation determining the mean number of atoms with zero momentum in a self-consistent way. Obtained results are in good agreement with the experiments on Bose-Einstein condensation in atomic beams. To explain experimental results on low amount of atoms in condensate in the superuid phase of liquid 4 He, we propose to consider the ground state of the condensate as a squeezed number state and discuss some corollaries coming from this conjecture.\",\"PeriodicalId\":249199,\"journal\":{\"name\":\"Old and New Concepts of Physics\",\"volume\":\"11 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2007-09-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Old and New Concepts of Physics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.2478/V10005-007-0016-9\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Old and New Concepts of Physics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2478/V10005-007-0016-9","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
We show that the Bogoliubov microscopic theory of superuidity of liquid 4 He allows quantum uctuations of both condensate and excitations. Comparison of those uctuations leads to an equation determining the mean number of atoms with zero momentum in a self-consistent way. Obtained results are in good agreement with the experiments on Bose-Einstein condensation in atomic beams. To explain experimental results on low amount of atoms in condensate in the superuid phase of liquid 4 He, we propose to consider the ground state of the condensate as a squeezed number state and discuss some corollaries coming from this conjecture.
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