"theoretical aspects" is a correct and usable phrase in written English. You can use it to refer to the abstract or theoretical components of a certain concept or topic. For example, "This research paper explores the theoretical aspects of human behavior."
It has – sometimes – theoretical aspects.
M.C. and S.T. developed the theoretical aspects.
This course addresses practical and theoretical aspects.
The theoretical aspects of inorganic chemistry.
I study theoretical aspects of atmospheric dynamics.
Heaps, H. S. Information Retrieval: Computational and Theoretical Aspects.
Damour, T. Theoretical aspects of the equivalence principle.
If the conception has theoretical aspects, discuss them critically.
The physicists' study still mostly relies on theoretical aspects.
8th Conf. on Theoretical Aspects of Rationality and Knowledge, 2001.
Heaps, H. S. Information Retrieval: Computational and Theoretical Aspects (Academic Press, Orlando, 1978).
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