Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chemically non-equilibrated QGP and thermal photon elliptic flow   It has been discovered in recent heavy-ion experiments that elliptic and
triangular flow of direct photons are underpredicted by most hydrodynamic
models. I discuss possible enhancement mechanisms based on late chemical
equilibration of the QGP and in-medium modification of parton distributions.
Numerical hydrodynamic analyses indicate that they suppress early photon
emission and visibly enhance thermal photon elliptic flow.

20
The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
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The categories of this paper are: cs
0
The categories of this paper are: hep-ph
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The categories of this paper are: math
35
The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin