I've been looking through the source code and I can't find any mention of a theta matrix for calculating the probability of topics given a document and since there's no input for an Alpha value to estimate the topics per document and the LDAState class has a logProbWordGivenTopic(int, int) method but nothing like getProbTopicGivenDocument() I can only assume the mahout implementation of LDA doesn't deal with discovering the topic distribution for specific documents. I'd love to be wrong though if someone else knows better.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.