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Extremal divisors on moduli spaces of rational curves with marked points
We study effective divisors on , focusing on hypertree
divisors introduced by Castravet and Tevelev and the proper transforms of
divisors on introduced by Chen and Coskun. Results
include a database of hypertree divisor classes and closed formulas for
Chen--Coskun divisor classes. We relate these two types of divisors, and from
this construct extremal divisors on for that
furnish counterexamples to the conjectural description of the effective cone of
given by Castravet and Tevelev.Comment: Gap in proof of Lemma 6.2 corrected; thanks to Angelo Felice Lopez
for bringing this to my attentio
Structural and optical properties of MOCVD AllnN epilayers
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