Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Early Universe and Planck's Radiation Law   The classical Friedmann-Lema\^itre equations are solved using a corrected
version of Planck's radiation law. The function curves of the scale parameter
a(t) and the variations with temperature a(T) and t(T) are given. It is shown
that a reasonable cosmological evolution is only possible in case of flat
spatial slices (k=0). The initial singularity is avoided. Horizon and flatness
problems do not exist. For low temperatures compared with the Planck
Temperatur, the equations yield the usual course of expansion of the standard
FLRW model for a radiation universe with k=0 and p=u(T)/3.

18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an