So one of my current research involve some sort of search based on different extents of granularity. I wanted to learn more about coarse-grained search algorithms.
I don't understand your question. Do you want to know how to do a search for information on coarse-grained materials or do you want to learn how to program a search engine to do this?
1. “Coarse-Grain Parallel Genetic Algorithms: Categorization and New Approach”. Proceedings of the Sixth IEEE Parallel & Distributed Processing , 28-37.
3. A Coarse-Grained Parallel Genetic Algorithm Employing Cluster Analysis for Multi-modal Numerical Optimisation Yong Yang, Jonathan Vincent, Guy Littlefair
If you want to store data in let us say a binary tree or a RedBlackTree and you want to do a search only to a specific level of accuracy then you would ask maybe for something called approximative search or approximation algorithm for search.