Rnanubandhana, Karma and Kundalini are dealt with in these 3 books of Robert E Svoboda.

https://archive.org/search.php?query=aghora%20svoboda

https://www.scribd.com/document/79755463/Rnanubandhana

Rnanubandhana is a term derived from Rna 'cosmic debt' and bandhana 'bondage' in this concept, action is not automatically considered as karma.

And of course, Sri Aurobindo goes into Karma extensively in the Problem of Rebirth.

https://legacy.yieldmore.org/works/problem-of-rebirth/