The arXiv database is a free, open-access database containing electronic pre-prints. Pre-prints have not been peer-reviewed or officially published in a journal yet but are available much sooner than the published version, which in some cases can take years.
Click 'Show All Fields', under the basic search box to the right, for help with:
Searching particular fields--like Title or Author (Standard and Advanced tabs)
How to search with multiple words (Syntax tab)
How to search with the Boolean operators AND/OR/NOT (Syntax tab)
How to do a wild card (*) search (Syntax tab)
More help can be found here.
And here:
