| Texto completo | |
| Autor(es): |
Madeira, Lucas
[1]
;
Garcia-Orozco, Arnol Daniel
[1]
;
dos Santos, Francisco Ednilson Alves
[2]
;
Bagnato, Vanderlei Salvador
[1, 3]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos - Brazil
[3] Texas A&M Univ, Dept Biomed Engn, College Stn, TX 77843 - USA
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Entropy; v. 22, n. 9 SEP 2020. |
| Citações Web of Science: | 1 |
| Resumo | |
Quantum turbulence deals with the phenomenon of turbulence in quantum fluids, such as superfluid helium and trapped Bose-Einstein condensates (BECs). Although much progress has been made in understanding quantum turbulence, several fundamental questions remain to be answered. In this work, we investigated the entropy of a trapped BEC in several regimes, including equilibrium, small excitations, the onset of turbulence, and a turbulent state. We considered the time evolution when the system is perturbed and let to evolve after the external excitation is turned off. We derived an expression for the entropy consistent with the accessible experimental data, which is, using the assumption that the momentum distribution is well-known. We related the excitation amplitude to different stages of the perturbed system, and we found distinct features of the entropy in each of them. In particular, we observed a sudden increase in the entropy following the establishment of a particle cascade. We argue that entropy and related quantities can be used to investigate and characterize quantum turbulence. (AU) | |
| Processo FAPESP: | 18/09191-7 - Vórtices e turbulência em fluidos quânticos fortemente interagentes e suas misturas |
| Beneficiário: | Lucas Madeira |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 13/07276-1 - CEPOF - Centro de Pesquisa em Óptica e Fotônica |
| Beneficiário: | Vanderlei Salvador Bagnato |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 14/50857-8 - INCT 2014 - de Óptica Básica e Aplicada às Ciências da Vida |
| Beneficiário: | Vanderlei Salvador Bagnato |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |