arXiv:1001.2809v1 [physics.atom-ph] 16 Jan 2010 Loss of trapped atoms or molecules due to inelastic collisions gives rise to heating through a mechanism called “anti-evaporation”, where particles removed from the trap have, on average, a lower energy than the remaining particles. Here, we model the heating due to inelastic two-body p -wave collisional loss in a trapped gas, as relevant to our experiments. To accommodate the spatial anisotropy of the dipole-dipole interaction and the possibility of an anisotropic energy distribution in the trapped gas, we define “temperatures” along three spatial directions using where the index i = x, y, z and N is the number of molecules. As the trap shape is a flat disk perpendicular to the vertical ( z ) axis, which is also the direction of the electric field, it is natural to assume that the temperatures in the two radial trap directions, T$_{x}$ and T$_{y}$ , are equal. The energies E$_{i}$ are defined as where m is the particle mass, ω$_{z}$ and ω$_{r}$ are the axial and radial trapping frequencies, respectively, and the sum is taken over all particles in the trap. The heating rates are then given by Each two-body inelastic collision removes two particles, so the loss rate is given by where Γ$_{coll}$ is the inelastic collision rate per particle. Similarly, E$_{z}$ = ∑ ( 1 2 mv 2 z + 1 2 mω$_{z}$z 2 ) (2) E$_{x}$ = ∑ ( 1 2 mv 2 x + 1 2 mω$_{x}$x 2 ) , dT$_{i}$ dt = − T$_{i}$ N dN dt + 1 k$_{B}$N dE$_{i}$ dt . (3) dN dt = − 2 N Γ$_{coll}$ , (4) dE$_{i}$ dt = − Δ E$_{i}$N Γ$_{coll}$ , (5) 1 Heating due to two-body inelastic p -wave collisions Supporting online material T$_{i}$ = E$_{i}$ k$_{B}$N , (1)