1,412 research outputs found
Convex Spacelike Hypersurfaces of Constant Curvature in de Sitter Space
We show that for a very general and natural class of curvature functions (for
example the curvature quotients ) the
problem of finding a complete spacelike strictly convex hypersurface in de
Sitter space satisfying with a prescribed
compact future asymptotic boundary at infinity has at least one smooth
solution (if l = 1 or l = 2 there is uniqueness). This is the exact analogue of
the asymptotic plateau problem in Hyperbolic space and is in fact a precise
dual problem. By using this duality we obtain for free the existence of
strictly convex solutions to the asymptotic Plateau problem for ; in both deSitter and Hyperbolic space.Comment: 24 page
Entire downward translating solitons to the mean curvature flow in Minkowski space
In this paper, we study entire translating solutions to a mean
curvature flow equation in Minkowski space. We show that if is a strictly spacelike hypersurface, then
reduces to a strictly convex rank k soliton in (after
splitting off trivial factors) whose "blowdown" converges to a multiple
of a positively homogeneous degree one convex function in
. We also show that there is nonuniqueness as the rotationally
symmetric solution may be perturbed to a solution by an arbitrary smooth order
one perturbation
Charged cosmological dust solutions of the coupled Einstein and Maxwell equations
It is well known through the work of Majumdar, Papapetrou, Hartle, and
Hawking that the coupled Einstein and Maxwell equations admit a static multiple
blackhole solution representing a balanced equilibrium state of finitely many
point charges. This is a result of the exact cancellation of gravitational
attraction and electric repulsion under an explicit condition on the mass and
charge ratio. The resulting system of particles, known as an extremely charged
dust, gives rise to examples of spacetimes with naked singularities. In this
paper, we consider the continuous limit of the
Majumdar--Papapetrou--Hartle--Hawking solution modeling a space occupied by an
extended distribution of extremely charged dust. We show that for a given
smooth distribution of matter of finite ADM mass there is a continuous family
of smooth solutions realizing asymptotically flat space metrics
Hypersurfaces of constant curvature in Hyperbolic space
We show that for a very general and natural class of curvature functions, the
problem of finding a complete strictly convex hypersurface satisfying
f({\kappa}) = {\sigma} over (0,1) with a prescribed asymptotic boundary
{\Gamma} at infinity has at least one solution which is a "vertical graph" over
the interior (or the exterior) of {\Gamma}. There is uniqueness for a certain
subclass of these curvature functions and as {\sigma} varies between 0 and 1,
these hypersurfaces foliate the two components of the complement of the
hyperbolic convex hull of {\Gamma}
A note on starshaped compact hypersurfaces with a prescribed scalar curvature in space forms
In [7], Guan, Ren and Wang obtained a a priori estimate for admissible
2-convex hypersurfaces satisfying the Weingarten curvature equation
In this note, we give a simpler proof of
this result, and extend it to space forms
Self-shrinkers to the mean curvature flow asymptotic to isoparametric cones
In this paper we construct an end of a self-similar shrinking solution of the
mean curvature flow asymptotic to an isoparametric cone C and lying outside of
C. We call a cone C in an isoparametric cone if C is the cone over a
compact embedded isoparametric hypersurface . The theory of
isoparametic hypersurfaces is extremely rich and there are infinitely many
distinct classes of examples, each with infinitely many members
Rearrangements and radial graphs of constant mean curvature in hyperbolic space
We investigate the problem of finding smooth hypersurfaces of constant mean
curvature in hyperbolic space, which can be represented as radial graphs over a
subdomain of the upper hemisphere. Our approach is variational and our main
results are proved via rearrangement techniques
Hypersurfaces of Constant Curvature in Hyperbolic Space I
We investigate the problem of finding complete strictly convex hypersurfaces
of constant curvature in hyperbolic space with a prescribed asymptotic boundary
at infinity for a general class of curvature functions
Interior curvature estimates and the asymptotic plateau problem in hyperbolic space
We show that for a very general class of curvature functions defined in the
positive cone, the problem of finding a complete strictly locally convex
hypersurface in satisfying with a
prescribed asymptotic boundary at infinity has at least one smooth
solution with uniformly bounded hyperbolic principal curvatures. Moreover if
is (Euclidean) starshaped, the solution is unique and also (Euclidean)
starshaped while if is mean convex the solution is unique. We also
show via a strong duality theorem that analogous results hold in De Sitter
space. A novel feature of our approach is a "global interior curvature
estimate".Comment: 20 page
A priori estimates for semistable solutions of semilinear elliptic equations
We consider positive semistable solutions of with zero
Dirichlet boundary condition, where is a uniformly elliptic operator and
is a positive, nondecreasing, and convex nonlinearity which is
superlinear at infinity. Under these assumptions, the boundedness of all
semistable solutions is expected up to dimension , but only
established for .
In this paper we prove the bound up to dimension under the
following further assumption on : for every , there exist
and such that for all . This bound follows from a -estimate
for for every and . Under a similar but more restrictive
assumption on , we also prove the estimate when . We remark
that our results do not assume any lower bound on .Comment: One bibliographical reference has been corrected with respect to the
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