vk
I am an epistemological minimalist, usually sticking to the strictly utilitarian mysticism. Hence the appeal of Bhagavan Ramana, whose use for doctrine is minimal. I have no personal use for theories of rebirth and such. I am quite happy listening to Ramana's exhortation to self enquiry and let all other questions rest. So my attempts to answer your questions may be a little sloppy...
vasanthakokilam wrote:By Atman, I assume you mean 'jIvAtmA' (since it can not be 'paramAtmA'. ), Or that is something else?
No I mean Atman which is the only substratum ... Atman = brhman. "parama" and "jiva" are qualifiers. In discourse, jivAtma is used to denote the totality of a personality.
- I assume you say that this Atman is an embodiment of "rest" and "peace" because it is an aspect of paramatma. Only when actuated inside a living body, the karmic equation, peace, rest, unrest, joy, suffering etc. begin. Am I on the right track here?
I am not sure! Paramatma is only a construct for the sake of the discourse, analysis and worship in the jAgrat state. In self-realization it has no reality. Hence Atma is just Atma.
- Back to the question: What is it that reincarnates? Is it this jivAtmA or something else?
That's a good question that has been asked before. I have to do something that I dislike...introduce jArgon and pile up more doctrine that will spawn more questions

. Generally, it is said there are three kinds of bodies...kArana sharira (causal), sUkshma sharira (subtle body) and sthUla sharira (the gross body). The sthUla sharira is the one familiar to our everyday jAgrat experience...it's the one sitting on the "stool" if I may

. It is the one that is born and dies.
The subtle/pranic body or the sUkshma sharira is the one that reincarnates. The suKshma sharira is supposed to consist of 18 or 19 components including the "subtle aspect" of the 5 sense organs, the 5 organs of action, buddhi, chitta, ahankAra and so on. Basically all that distilled mental stuff. Essentially, it undergoes constant Karmic modification throughout a life until the sthula sharira it is attached to decays and dies. Thereafter it gets thrust into another suitable physical body in the next birth.
- In between births, is the karmic data, marshalled in some form, get attached to the thing that reincarnates?
The answer to this question is embedded in the previous one. The "karmic data" is constantly being programmed into the sUkshma sharira, so that no new programming needs to take place between births. The sUkshma sharira automatically attaches to a suitable sthula sharira that has the right qualifications. Not all the qualifications may be fulfilled in the next sthula sharira and a birth may be acquired just to discharge a strong impulse and thereafter a new birth for the rest. An interesting aspect is that non-human sthUla shariras "freeze" the sUkshma sharira till the next human sthUla sharira. That is, animals don't have any accumulated karma. For example - just a silly imperfect example that I don't believe in - a strong agressive carnivorous instinct acquired in some human birth may have to be worked out as a tiger in the next birth after which the sUkshma sharira moves on to acquire the next suitable body, none the better or worse.
So what the heck is the karana sharira or causal body ? As I understand it, it is the seed or original body. In the "beginning", all karana shariras were created equal. Then random walks created various karmic imbalances that are being worked out in the form of sUkshma and sthUla shariras. Thus viewed statistically over countless incarnations, nothing ever happened. The mean free path of every karana sharira is the same. Hence the entire vessel full of kArana shariras can further be aggregated since nothing differentiates them. That aggregate is Brahman. This is just my attempt at a vasanthakokilamism

.