<p>In 1990, Kraus [<CitationRef CitationID="CR12">12</CitationRef>] classified all possible inertia images of the <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\ell \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>ℓ</mi> </math></EquationSource> </InlineEquation>-adic Galois representation attached to an elliptic curve over a non-archimedean local field. In [<CitationRef CitationID="CR1">1</CitationRef>, <CitationRef CitationID="CR2">2</CitationRef>], the author computed explicitly the Galois representation of elliptic curves having non-abelian inertia image, a phenomenon which only occurs when the residue characteristic of the field of definition is 2 or 3 and the curve attains good reduction over some non-abelian ramified extension. In this work, the computation of the Galois representation in all the remaining “wild” cases, i.e. when the residue characteristic is <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(p=2\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>p</mi> <mo>=</mo> <mn>2</mn> </mrow> </math></EquationSource> </InlineEquation> or 3 and the curve attains good reduction over an extension whose ramification degree is divisible by <i>p</i> (without assuming the condition on the image of inertia being non-abelian), is completed. This is based on Chapter V of the author’s PhD thesis [<CitationRef CitationID="CR4">4</CitationRef>].</p>

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Wild Galois representations: elliptic curves with wild cyclic reduction

  • Nirvana Coppola

摘要

In 1990, Kraus [12] classified all possible inertia images of the \(\ell \) -adic Galois representation attached to an elliptic curve over a non-archimedean local field. In [1, 2], the author computed explicitly the Galois representation of elliptic curves having non-abelian inertia image, a phenomenon which only occurs when the residue characteristic of the field of definition is 2 or 3 and the curve attains good reduction over some non-abelian ramified extension. In this work, the computation of the Galois representation in all the remaining “wild” cases, i.e. when the residue characteristic is \(p=2\) p = 2 or 3 and the curve attains good reduction over an extension whose ramification degree is divisible by p (without assuming the condition on the image of inertia being non-abelian), is completed. This is based on Chapter V of the author’s PhD thesis [4].