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• # Artykuł - szczegóły

## Acta Arithmetica

2013 | 159 | 2 | 133-148

## Explicit Selmer groups for cyclic covers of ℙ¹

EN

### Abstrakty

EN
For any abelian variety J over a global field k and an isogeny ϕ: J → J, the Selmer group $Sel^{ϕ}(J,k)$ is a subgroup of the Galois cohomology group $H¹(Gal(k^{s}/k),J[ϕ])$, defined in terms of local data. When J is the Jacobian of a cyclic cover of ℙ¹ of prime degree p, the Selmer group has a quotient by a subgroup of order at most p that is isomorphic to the fake Selmer group', whose definition is more amenable to explicit computations. In this paper we define in the same setting the explicit Selmer group', which is isomorphic to the Selmer group itself and just as amenable to explicit computations as the fake Selmer group. This is useful for describing the associated covering spaces explicitly and may thus help in developing methods for second descents on the Jacobians considered.

133-148

wydano
2013

### Twórcy

autor
• Mathematisches Institut, Universität Bayreuth, 95440 Bayreuth, Germany
autor
• Mathematisch Instituut, Universiteit Leiden, Postbus 9512, 2300 RA, Leiden, The Netherlands