Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Shifted View of Fundamental Physics   We speculate on the role of relativistic versions of delayed differential
equations in fundamental physics. Relativistic invariance implies that we must
consider both advanced and retarded terms in the equations, so we refer to them
as shifted equations. The shifted Dirac equation has some novel properties. A
tentative formulation of shifted Einstein-Maxwell equations naturally
incorporates a small but nonzero cosmological constant.

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The categories of this paper are: physics
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
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The categories of this paper are: cs
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph