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Journal de Th´

eorie des Nombres

de Bordeaux

20

(2008), 165–182

On the slopes of the

U

5

operator acting on

overconvergent modular forms

par

L. J. P. KILFORD

R´esum´e. Nous d´emontrons que les pentes de l’op´erateurU5

agis-sant sur 5-adique formes modulaires surconvergentes de poids k avec caract`ere de Dirichlet primitifχ de conducteur 25 sont

1 4·

8i

5

:iN

ou

1 4·

8i+ 4

5

:iN

.

Nous prouvons aussi que l’espace de forms parabolique de poids ket caract`ereχa une base des formes propres pour les op´erateurs de HeckeTp et U5 d´efinie surQ5(4

5,√3).

Abstract. We show that the slopes of theU5operator acting on

5-adic overconvergent modular forms of weight k with primitive Dirichlet characterχof conductor 25 are given by either

1

4 · 8i

5

:iN

or 1

4 ·

8i+ 4

5

:iN

,

depending onkand χ.

We also prove that the space of classical cusp forms of weightk and character χ has a basis of eigenforms for the Hecke opera-torsTp andU5which is defined overQ5(4

5,√3).

L. J. P.Kilford

Department of Mathematics Royal Fort Annexe

University of Bristol BS8 1TW, United Kingdom

E-mail:[email protected]

URL:http://www.maths.bris.ac.uk/ maljpk/

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