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Wieferich Primes and a mod $p$ Leopoldt Conjecture. (arXiv:1805.00131v2 [math.NT] UPDATED)

We consider questions in Galois cohomology which arise by considering mod $p$ Galois representations arising from automorphic forms. We consider a Galois cohomological analog for the standard heuristics about the distribution of Wieferich primes, i.e. prime $p$ such that $2^{p-1}$ is 1 mod $p^2$. Our analog relates to asking if in a compatible system of Galois representations, for almost all primes $p$, the residual mod $p$ representation arising from it has unobstructed deformation theory. This analog leads in particular to formulating a mod $p$ analog for almost all primes $p$ of the classical Leopoldt conjecture, which has been considered previously by G. Gras. Leopoldt conjectured that for a number field $F$, and a prime $p$, the $p$-adic regulator $R_{F,p}$ is non-zero. The mod $p$ analog is that for a fixed number field $F$, for almost all primes $p$, the $p$-adic regulator $R_{F,p}$ is a unit at $p$.查看全文

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