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Mathematics and mechanics
The concept and criteria of the capacitive type of the non-compact Riemannian manifold based on the generalized capacity
V. M. Keselman MIREA — Russian Technological University
Abstract:
Let
$M^n$ be a non-compact
$n$-dimensional Riemannian manifold and let
$p>1$ be a fixed real number.
We call
$(F, p)$-capacity of a compact set
$K\subset M^n$ a value
$\inf\int_{M^n}(F(x, \nabla u))^p dv$,
where the exact lower bound is taken over all smooth functions
$u$ finite in
$M^n$
and such that
$u \geq 1$ on
$K$.
Function
$F = F(x, \xi)$,
$(x, \xi)\in TM^n$ is smooth, non-negative
and satisfies certain general conditions.
A special case of
$(F, p)$-capacity is, e. g., the conformal capacity when
$F(x, \xi) = |\xi|$ and
$p = n$.
We based this notion of
$(F, p)$-capacity on the work of G. Choquet, V.G. Mazya, and V.M. Miklyukov.
Let us introduce the concept of the type of a non-compact manifold
$M^n$ as follows.
We say that
$M^n$ is of
$(F, p)$-parabolic type, if the
$(F, p)$-capacity
of some non-degenerate compact
$K\subset M^n$ is zero.
Otherwise, we say that manifold
$M^n$ is of
$(F, p)$-hyperbolic type.
Like in the classical case, this notion of
$(F, p)$-type of the non-compact Riemannian manifold
is invariant with respect to the specific choice of the compact set
$K$.
We prove the criteria for the manifold to be of
$(F, p)$-parabolic or
$(F, p)$-hyperbolic type.
Special cases of these are the well-known criteria of conformal type of a Riemannian manifold
expressed in terms of growth of the volume
$V(r)$ of geodesic balls
or of area
$S(r)$ of their boundary spheres of radius
$r$.
In the general case of criteria of
$(F, p)$-type of manifold
$M^n$
the role of the class of complete metrics conformal to the initial metric of the manifold
takes on the class of exhaustion functions
$h$ of manifold
$M^n$,
and the roles of
$V(r)$ and
$S(r)$ are taken by functions
$V_{F, p, h}(r)=\int_{h\leq r}(F(x,\nabla h))^p dv$ and
$ S_{F, p, h}(r) = \int_{h = r}(F(x, \nabla h))^p(d\sigma /|\nabla h|)$, respectively.
The criteria themselves are expressed in terms of the growth of these functions.
For instance, the following conditions
$$\int^{+\infty}\left(\frac{r}{V_{F, p, h}(r)}\right)^{\frac{1}{p-1}}dr =
\infty, \; \int^{+\infty}\left(\frac{1}{S_{F, p, h}(r)}\right)^{\frac{1}{p-1}}dr = \infty $$
characterize the
$(F, p)$-parabolic type of the non-compact Riemannian manifold.
Keywords:
Riemannian manifold, capacity, conformal type, p-parabolictype, p-hyperbolic type, volume of a geodesic ball, area of the geodesic sphere, exhaustion function.
UDC:
517.95
BBK:
22.161.5
Received: 19.03.2019
DOI:
10.15688/mpcm.jvolsu.2019.2.2