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Following a simulation approach of recent publications we explore theviability of the neutrino-heating explosion mechanism in dependence on thespatial dimension. Our results disagree with previous findings. While we alsoobserve that two-dimensional (2D) models explode for lower driving neutrinoluminosity than spherically symmetric (1D) models, we do not find thatexplosions in 3D occur easier and earlier than in 2D. Moreover, we find thatthe average entropy of matter in the gain layer hardly depends on the dimensionand thus is no good diagnostic quantity for the readiness to explode. Instead,mass, integrated entropy, total neutrino-heating rate, and nonradial kineticenergy in the gain layer are higher when models are closer to explosion.Coherent, large-scale mass motions as typically associated with the standingaccretion-shock instability (SASI) are observed to be supportive for explosionsbecause they drive strong shock expansion and thus enlarge the gain layer.While 2D models with better angular resolution explode clearly more easily, theopposite trend is seen in 3D. We interpret this as a consequence of theturbulent energy cascade, which transports energy from small to large spatialscales in 2D, thus fostering SASI activity. In contrast, the energy flow in 3Dis in the opposite direction, feeding fragmentation and vortex motions onsmaller scales and thus making the 3D evolution with finer grid resolution moresimilar to 1D. More favorable conditions for explosions in 3D may therefore betightly linked to efficient growth of low-order SASI modes includingnonaxisymmetric ones.

Is Strong SASI Activity the Key to Successful Neutrino-Driven Supernova Explosions?