Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Perfect Hyperfluid of Metric-Affine Gravity: The Foundation   We set the foundation and formulate the Perfect (Ideal) Hyperfluid. The
latter represents the natural generalization of the usual perfect fluid
structure where now the microscopic characteristics of matter (spin, shear,
dilation) are also taken into account, sourcing a non-Riemannian arena (i.e
spacetime torsion and non-metricity) for Metric-Affine Gravity. We derive the
energy tensors of this Hyperfluid structure and subsequently present the
conservation laws obeyed by them. Finally, we consider a Cosmological
application of this Perfect Hyperfluid and classify some possible forms of this
fluid structure.

18
The categories of this paper are: econ
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat