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2 votes

The attractive 'force' between phase interfaces in the Allen-Cahn model

The gradient flow $$\frac{\partial u}{\partial t}=\epsilon^2\Delta u+f(u),\;\;\text{with}\;\;f(u)=u(1-u^2),$$ of the Allen-Cahn functional has no inertia (there is no second order derivative in time), …
Carlo Beenakker's user avatar
9 votes

Is there a solution of the Yamabe problem using Ricci flow?

I presume you are referring to the Yamabe flow approach to the Yamabe problem, which in 2 dimensions reduces to a Ricci flow. Relevant references include The Ricci flow on surfaces (1988) The Ricci …
Carlo Beenakker's user avatar
6 votes
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Are there currently any plausible approaches to proving the Penrose сonjecture?

The difficulty of a general proof was discussed in A counter-example to a recent version of the Penrose conjecture (2010): a general existence theorem cannot be expected with boundary conditions compa …
Carlo Beenakker's user avatar