46 research outputs found
An optimization problem for the first weighted eigenvalue problem plus a potential
In this paper, we study the problem of minimizing the first eigenvalue of the
Laplacian plus a potential with weights, when the potential and the weight
are allowed to vary in the class of rearrangements of a given fixed potential
and weight . Our results generalized those obtained in [9] and [5].Comment: 15 page
Existence of solution to a critical equation with variable exponent
In this paper we study the existence problem for the Laplacian
operator with a nonlinear critical source. We find a local condition on the
exponents ensuring the existence of a nontrivial solution that shows that the
Pohozaev obstruction does not holds in general in the variable exponent
setting. The proof relies on the Concentration--Compactness Principle for
variable exponents and the Mountain Pass Theorem
A mass transportation approach for Sobolev inequalities in variable exponent spaces
In this paper we provide a proof of the Sobolev-Poincar\'e inequality for
variable exponent spaces by means of mass transportation methods. The
importance of this approach is that the method is exible enough to deal with
different inequalities. As an application, we also deduce the Sobolev-trace
inequality improving the result obtained by Fan.Comment: 12 page
Estimates for the Sobolev trace constant with critical exponent and applications
In this paper we find estimates for the optimal constant in the critical
Sobolev trace inequality S\|u\|^p_{L^{p_*}(\partial\Omega) \hookrightarrow
\|u\|^p_{W^{1,p}(\Omega)} that are independent of . This estimates
generalized those of [3] for general . Here is the
critical exponent for the immersion and is the space dimension. Then we
apply our results first to prove existence of positive solutions to a nonlinear
elliptic problem with a nonlinear boundary condition with critical growth on
the boundary, generalizing the results of [16]. Finally, we study an optimal
design problem with critical exponent.Comment: 22 pages, submitte
Optimal boundary holes for the Sobolev trace constant
In this paper we study the problem of minimizing the Sobolev trace Rayleigh
quotient among
functions that vanish in a set contained on the boundary of
given boundary measure.
We prove existence of extremals for this problem, and analyze some particular
cases where information about the location of the optimal boundary set can be
given. Moreover, we further study the shape derivative of the Sobolev trace
constant under regular perturbations of the boundary set.Comment: 22 page
A Nonlinear eigenvalue problem with indefinite weights related to the Sobolev trace embedding
In this paper we study the Sobolev trace embedding W1,p([omega]) -->LpV ([delta omega]), where V is an indefinite weight. This embedding leads to a nonlinear eigenvalue problem where the eigenvalue appears at the (nonlinear) boundary condition. We prove that there exists a sequence of variational eigenvalues [lambda]k --> +[infinity] and then show that the first eigenvalue is isolated, simple and monotone with respect to the weight. Then we prove a nonexistence result related to the first eigenvalue and we end this article with the study of the second eigenvalue proving that it coincides with the second variational eigenvalue