Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Magnetic Field, and Entropy Increase, in a Machian Universe   By means of the experimental result on the present equipartition between
background microwave radiation energy and that of the interstellar magnetic
field, and by advancing a Machian relation for the magnetic field, which,
differently than in other authors' papers, is valid for the entire spanlife of
the Universe, implying that the magnetic field depends on the inverse radius of
the Universe, we obtain a general formula such that B depends on the inverse of
R . Our estimate for Planck's magnetic field is (1/1000) times the Sabbata and
Sivaram's one. It is shown that the energy densities involved in the above
problem are dependent on the inverse square of R . For radiation, this implies,
as we show, that the total entropy of the Universe is increasing with
expansion. In particular we show that R depends on the inverse square of T,
where T is the absolute temperature, and the entropy is proportional to the 3/2
power of R .

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The categories of this paper are: hep-ph
1
The categories of this paper are: cs
18
The categories of this paper are: econ
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org