Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic Thermodynamics of Magnetized Fermi Electron Gas   To study the relativistic thermodynamic properties of a Fermi gas in a strong
magnetic field, we construct the relativistic thermodynamic potential by the
relativistic Fermi distribution function taking into account that the motion of
particles in a plane perpendicular to the magnetic field is quantized. With
this general potential at hand, we investigate all the thermodynamic quantities
as a function of densities, temperatures and the magnetic field. We obtain a
novel set of adiabatic equations. Having the expression of the pressure and
adiabatic state equations, we determine the sound velocity for several cases
revealing a new type of sound velocity. Finally, we disclose the magnetic
cooling in the quantized electron Fermi gas, which is based on an adiabatic
magnetization in contrast to the known adiabatic demagnetization.

13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th