We estimate the number of possible degree patterns of k-lacunary polynomials of degree t < p which split completely modulo p. The result is based on a combination of a bound on the number of zeros of lacunary polynomials with some graph theory arguments.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-ba59-3-1, author = {Khodakhast Bibak and Igor E. Shparlinski}, title = {On Fully Split Lacunary Polynomials in Finite Fields}, journal = {Bulletin of the Polish Academy of Sciences. Mathematics}, volume = {59}, year = {2011}, pages = {197-202}, zbl = {1261.11079}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ba59-3-1} }
Khodakhast Bibak; Igor E. Shparlinski. On Fully Split Lacunary Polynomials in Finite Fields. Bulletin of the Polish Academy of Sciences. Mathematics, Tome 59 (2011) pp. 197-202. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ba59-3-1/