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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Rescuing the concept of swimming in curved spacetime

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Andrade e Silva, Rodrigo ; Matsas, George E. A. ; Vanzella, Daniel A. T.
Total Authors: 3
Document type: Journal article
Source: Physical Review D; v. 94, n. 12 DEC 22 2016.
Web of Science Citations: 1

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)

FAPESP's process: 15/22482-2 - Gravity and quantum field theory
Grantee:George Emanuel Avraam Matsas
Support type: Regular Research Grants
FAPESP's process: 15/10373-4 - Motion of extended bodies in curved spacetimes: swimming and other possible effects
Grantee:Rodrigo Andrade e Silva
Support type: Scholarships in Brazil - Master
FAPESP's process: 13/12165-4 - Quantum phenomena in curved spacetimes
Grantee:Daniel Augusto Turolla Vanzella
Support type: Regular Research Grants