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- Sudhir N Pathak, Zahera Jabeen, Dibyendu Das, R Rajesh
- Physical review letters
- 2014

The kinetic energy of a freely cooling granular gas decreases as a power law t(-θ) at large times t. Two theoretical conjectures exist for the exponent θ. One based on ballistic aggregation of compact spherical aggregates predicts θ=2d/(d+2) in d dimensions. The other based on Burgers equation describing anisotropic, extended clusters predicts θ=d/2 when… (More)

- Sudhir N Pathak, Zahera Jabeen, Purusattam Ray, R Rajesh
- Physical review. E, Statistical, nonlinear, and…
- 2012

We analyze a recent experiment [Boudet, Cassagne, and Kellay, Phys. Rev. Lett. 103, 224501 (2009)] in which the shock created by the impact of a steel ball on a flowing monolayer of glass beads is studied quantitatively. We argue that radial momentum is conserved in the process and hence show that in two dimensions the shock radius increases in time t as a… (More)

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