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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Rescuing the concept of swimming in curved spacetime

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Autor(es):
Andrade e Silva, Rodrigo ; Matsas, George E. A. ; Vanzella, Daniel A. T.
Número total de Autores: 3
Tipo de documento: Artigo Científico
Fonte: Physical Review D; v. 94, n. 12 DEC 22 2016.
Citações Web of Science: 1
Resumo

It has been argued that an extended, quasi-rigid body evolving freely in curved spacetime can deviate from its natural trajectory by simply performing cyclic deformations. More interestingly, in the limit of rapid cycles, the amount of deviation, per cycle, would depend on the sequence of deformations but not on how fast they are performed-like the motion of a swimmer at low Reynolds number. Here, however, we show that the original analysis which supported this idea is inappropriate to investigate the motion of extended bodies in the context of general relativity, rendering its quantitative results invalid and casting doubts on the reality of this swimming effect. We illustrate this by showing that the original analysis leads to a nonzero deviation even in a scenario where no swimming can possibly occur. Notwithstanding, by applying a fully covariant, local formalism, we show that swimming in curved spacetime is indeed possible and that, in general, its magnitude can be of the same order as (fortuitously) anticipated-although it is highly suppressed in the particular scenario where it was originally investigated. (AU)

Processo FAPESP: 13/12165-4 - Fenômenos quânticos em espaços-tempos curvos
Beneficiário:Daniel Augusto Turolla Vanzella
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 15/10373-4 - Movimentos de corpos extensos em espaços-tempos curvos: natação e outros possíveis efeitos
Beneficiário:Rodrigo Andrade e Silva
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 15/22482-2 - Gravitação e teoria quântica de campos
Beneficiário:George Emanuel Avraam Matsas
Linha de fomento: Auxílio à Pesquisa - Regular