47 citations · 226 across the 12 of their papers we have counts for
4 papers · 1 filter
On the meaning of Tsallis functional in astrophysics
P. H. Chavanis, C. Sire
We discuss the meaning of Tsallis functional in astrophysics. The energy functional of a polytropic star is similar to Tsallis free energy and the H-function associated with a stel…
Gravitational collapse of a Brownian gas
C. Sire, P. H. Chavanis
We investigate a model describing the dynamics of a gas of self-gravitating Brownian particles. This model can also have applications for the chemotaxis of bacterial populations. W…
Autocorrelation exponent of conserved spin systems in the scaling regime following a critical quench
Clément Sire
We study the autocorrelation function of a conserved spin system following a quench at the critical temperature. Defining the correlation length L(t)\sim t^{1/z}, we find that for…
Estimate of blow-up and relaxation time for self-gravitating Brownian particles and bacterial populations
Pierre-Henri Chavanis, Clement Sire
We determine an asymptotic expression of the blow-up time t_coll for self-gravitating Brownian particles or bacterial populations (chemotaxis) close to the critical point. We show…