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$F$-thresholds and test ideals of Thom-Sebastiani type polynomials (2005.09172v1)
Published 19 May 2020 in math.AC and math.AG
Abstract: We provide a formula for $F$-thresholds of a Thom-Sebastiani type polynomial over a perfect field of prime characteristic. This result extends the formula for the $F$-pure threshold of a diagonal hypersurface. We also compute the first test ideal of Thom-Sebastiani type polynomials. Finally, we apply our result to find hypersurfaces where the log canonical thresholds equals the $F$-pure thresholds for infinitely many prime numbers.
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