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We know that when fluids move fast enough they create turbulence. So, my question is: Is it true for mass-less or negligible mass particles also, do they also show turbulence when accelerated to extremely high speeds?

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  • $\begingroup$ In what medium? $\endgroup$ – knzhou Apr 7 '18 at 11:47
  • $\begingroup$ knzhou I am particularly interested in vacuum because it is less hard than other cases $\endgroup$ – Bhaskar Pandey Apr 8 '18 at 15:46
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Estakhr's decomposition is a mathematical technique to separate the average and fluctuating parts of Relativistic Turbulent Flows.

$${\overline{U}^{\mu}=\lim_{\tau\rightarrow\infty}({\frac{1}{\tau}}\int_{\tau_{o}}^{\tau}U^{\mu} d\tau)}$$

Where the $\tau$ is proper time.

$${U^{\mu}=\overline{U}^{\mu}+U'^{\mu}}$$

Where the $\overline{U}^{\mu}$ denotes the proper time average called steady component and $U'^{\mu}$ is fluctuating part.

There are No turbulence، When fluctuating part is equal to zero.

$$U'^{\mu}=0$$

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  • $\begingroup$ I really liked your answer, but it would be amazing if you could explain the integral and how it is derived (maybe not derivation but intuitive sense of it) $\endgroup$ – Bhaskar Pandey Apr 8 '18 at 16:03

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