"theoretical description" is a correct and commonly used phrase in written English.
Example: The textbook provided a detailed theoretical description of quantum mechanics.
F.M. and K.P. formulated the theoretical description.
A theoretical description of the new phases of liquid 3He.
Figure 1: Theoretical description of the frustrated magnet.
The theoretical description of the forces of nature and elementary particles.
The theoretical description of our work was developed by B.R. and M.M.
The start with a theoretical description of the problem and how it can be solved.
However, the complicated interplay of the physical processes in WDM creates difficulty for theoretical description.
The last threat of instability thus disappeared from the theoretical description of the solar system.
Theoretical description of internal filtration is lacking, however.
The findings are translated into a concise theoretical description.
The resulting theoretical description of the star's evolution is quite interesting.
