Published Paper

Inserted: 18 apr 2011
Last Updated: 29 jul 2013

Journal: Ann. Mat. Pura Appl.
Volume: 192
Number: 4
Pages: 673-718
Year: 2013
Doi: 10.1007/s00526-013-0656-y
Links: http://www.springerlink.com/content/g37m26q02843107k/

Abstract:

We study existence, unicity and other geometric properties of the minimizers of the energy functional $$ \
u\
²_{H^s(\Omega)}+\int_\Omega W(u)\,dx, $$ where $\
u\
_{H^s(\Omega)}$ denotes the total contribution from $\Omega$ in the $H^s$ norm of $u$ and $W$ is a double-well potential. We also deal with the solutions of the related fractional elliptic Allen-Cahn equation on the entire space $\mathbb{R}^n$.

The results collected here will also be useful for forthcoming papers, where the second and the third author will study the $\Gamma$-convergence and the density estimates for level sets of minimizers.

Keywords: phase transitions, fractional Laplacian, Nonlocal energy, Gagliardo norm

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