Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Emergent Friedmann equation from the evolution of cosmic space revisited   Following the recent study on the emergent Friedmann equation from the
expansion of cosmic space for a flat universe, we apply this method to a
nonflat universe, and modify the evolution equation to lead to the Friedmann
equation. In order to maintain the same form with the original evolution
equation, we have to define the time-dependent Plank constant, which shows that
the spatial curvature of $k=0$ and $k=1$ is preferable to $k=-1$ since the
Plank constant of the nonflat open universe is divergent. Finally, we discuss
its physical consequences.

16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph