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research
Homology cycles in manifolds with locally standard torus actions
Authors
Anton Ayzenberg
Publication date
6 February 2015
Publisher
View
on
arXiv
Abstract
Let
X
X
X
be a
2
n
2n
2
n
-manifold with a locally standard action of a compact torus
T
n
T^n
T
n
. If the free part of action is trivial and proper faces of the orbit space
Q
Q
Q
are acyclic, then there are three types of homology classes in
X
X
X
: (1) classes of face submanifolds; (2)
k
k
k
-dimensional classes of
Q
Q
Q
swept by actions of subtori of dimensions
<
k
<k
<
k
; (3) relative
k
k
k
-classes of
Q
Q
Q
modulo
β
Q
\partial Q
β
Q
swept by actions of subtori of dimensions
β©Ύ
k
\geqslant k
β©Ύ
k
. The submodule of
H
β
(
X
)
H_*(X)
H
β
β
(
X
)
spanned by face classes is an ideal in
H
β
(
X
)
H_*(X)
H
β
β
(
X
)
with respect to the intersection product. It is isomorphic to
(
Z
[
S
Q
]
/
Ξ
)
/
W
(\mathbb{Z}[S_Q]/\Theta)/W
(
Z
[
S
Q
β
]
/Ξ
)
/
W
, where
Z
[
S
Q
]
\mathbb{Z}[S_Q]
Z
[
S
Q
β
]
is the face ring of the Buchsbaum simplicial poset
S
Q
S_Q
S
Q
β
dual to
Q
Q
Q
;
Ξ
\Theta
Ξ
is the linear system of parameters determined by the characteristic function; and
W
W
W
is a certain submodule, lying in the socle of
Z
[
S
Q
]
/
Ξ
\mathbb{Z}[S_Q]/\Theta
Z
[
S
Q
β
]
/Ξ
. Intersections of homology classes different from face submanifolds are described in terms of intersections on
Q
Q
Q
and
T
n
T^n
T
n
.Comment: 25 pages, 3 figures. Minor correction in Lemma 3.3 and a calculations of Subsection 7.
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oai:arXiv.org:1502.01130
Last time updated on 24/09/2015