The explicit Brumer–Stark unit conjecture via Shintani integrals

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Let FF be a totally real field, let H/FH/F be a finite abelian CM extension, and let p\mathfrak p split completely in HH. For a prime ideal b\mathfrak b prime to the prescribed modulus, let σb∈G\sigma_{\mathfrak b}\in G be its Frobenius and let up(b)an∈Fp∗u_p(\mathfrak b)^{\mathrm{an}}\in F_p^* be the explicitly defined multiplicative-integral expression. Let upu_{\mathfrak p} be the Brumer–Stark unit. Explicit Brumer–Stark unit conjecture. One should have

σb(up)=up(b)anin Fp∗.\sigma_{\mathfrak b}(u_{\mathfrak p})=u_p(\mathfrak b)^{\mathrm{an}}\quad\text{in }F_p^*.

The formula is intended to compute all conjugates of the Brumer–Stark unit and has computational applications to explicit class field theory. The source gives no resolution status.

References

Primary source

Samit Dasgupta and Mahesh Kakde, “On the Brumer-Stark Conjecture and Refinements”, arXiv:2204.09037 (2022).

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