Mustată–Takagi–Watanabe conjecture on equality of log canonical and F-pure thresholds

Let fQ[x1,,xn]f\in\mathbb{Q}[x_1,\ldots,x_n], and for each prime number pp let fpFp[x1,,xn]f_p\in\mathbb{F}_p[x_1,\ldots,x_n] be the polynomial obtained by reducing each coefficient of ff modulo pp. Let lct0(f){\bf lct}_0(f) denote the log canonical threshold of ff at the origin, and let cm(fp){\bf c}^{\mathfrak{m}}(f_p) denote the FF-pure threshold of fpf_p with respect to the maximal ideal. Mustată–Takagi–Watanabe conjecture. There exist infinitely many prime numbers pp such that

lct0(f)=cm(fp).{\bf lct}_0(f)={\bf c}^{\mathfrak{m}}(f_p).

Mustată, Takagi, and Watanabe proved that cm(fp){\bf c}^{\mathfrak{m}}(f_p) converges to lct0(f){\bf lct}_0(f) as pp tends to infinity. The conjecture asks whether this limiting equality is attained for infinitely many primes.

Sources & referencesView supporting material

Primary source

Manuel González Villa, Delio Jaramillo-Velez and Luis Núñez-Betancourt, “F-thresholds and test ideals of Thom-Sebastiani type polynomials”, arXiv:2005.09172 (2020).

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