Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Uniqueness of complete maximal hypersurfaces in spatially open
  $(n+1)$-dimensional Robertson-Walker spacetimes with flat fiber   In this paper, under natural geometric and physical assumptions we provide
new uniqueness and non-existence results for complete maximal hypersurfaces in
spatially open Robertson-Walker spacetimes whose fiber is flat. Moreover, our
results are applied to relevant spacetimes as the steady state spacetime,
Einstein-de Sitter spacetime and radiation models.

0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph