Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Is a first order space-time theory possible?   Einstein's general relativity relates the curvature of space time, a second
order differential property, to the stress-energy-momentum tensor. In this
paper we ask whether it is possible to develop a first order theory relating
space-time angles to the energy-momentum vector. We suggest several concepts
that would be relevant, including quantum mechanical concepts that are usually
treated separately. Phenomenological Lorentz covariance arises from both field
and coordinate transformation and the Dirac equation becomes a special case of
the space-time field equation. We reinterpret Kaluza-Klein theory in this
context by considering the compact fifth dimension as the quantum wavefunction
phase. Further directions for development are suggested.

27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio