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Ramification and moduli spaces of finite flat models

Naoki Imai (2011)

Annales de l’institut Fourier

We determine the type of the zeta functions and the range of the dimensions of the moduli spaces of finite flat models of two-dimensional local Galois representations over finite fields. This gives a generalization of Raynaud’s theorem on the uniqueness of finite flat models in low ramifications.

Ramification groups and Artin conductors of radical extensions of

Filippo Viviani (2004)

Journal de Théorie des Nombres de Bordeaux

We study the ramification properties of the extensions ( ζ m , a m ) / under the hypothesis that m is odd and if p m than either p v p ( a ) or p v p ( m ) v p ( a ) ( v p ( a ) and v p ( m ) are the exponents with which p divides a and m ). In particular we determine the higher ramification groups of the completed extensions and the Artin conductors of the characters of their Galois group. As an application, we give formulas for the p -adique valuation of the discriminant of the studied global extensions with m = p r .

Ramification groups in Artin-Schreier-Witt extensions

Lara Thomas (2005)

Journal de Théorie des Nombres de Bordeaux

Let K be a local field of characteristic p > 0 . The aim of this paper is to describe the ramification groups for the pro- p abelian extensions over K with regards to the Artin-Schreier-Witt theory. We shall carry out this investigation entirely in the usual framework of local class field theory. This leads to a certain non-degenerate pairing that we shall define in detail, generalizing in this way the Schmid formula to Witt vectors of length n . Along the way, we recover a result of Brylinski but with...

Ramification in quartic cyclic number fields K generated by x 4 + p x 2 + p

Julio Pérez-Hernández, Mario Pineda-Ruelas (2021)

Mathematica Bohemica

If K is the splitting field of the polynomial f ( x ) = x 4 + p x 2 + p and p is a rational prime of the form 4 + n 2 , we give appropriate generators of K to obtain the explicit factorization of the ideal q 𝒪 K , where q is a positive rational prime. For this, we calculate the index of these generators and integral basis of certain prime ideals.

Ramifications minimales

Georges Gras (2000)

Journal de théorie des nombres de Bordeaux

Nous appliquons à la notion d’extension (cyclique de degré p ) à ramification minimale, les techniques de “ réflexion ” qui permettent une caractérisation très simple de ces extensions à l’aide d’un corps gouvernant.

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