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The database contains information about Bianchi modular forms over several imaginary quadratic fields including all nine fields of class number $1$, for a range of levels.

Over the five Euclidean imaginary quadratic fields: $\mathbb{Q}(\sqrt{-d})$ for $d=1,2,3,7,11$, we have the dimensions of the full cuspidal space and the new subspace at each $GL_2$-level, for weight 2 forms.

Over all nine class number one fields (the Euclidean fields and also $\mathbb{Q}(\sqrt{-d})$ for $d=19, 43, 67, 163$), and also over $\mathbb{Q}(\sqrt{-5})$, we have the cuspidal and new dimensions for a range of $SL_2$-levels, and for a range of weights.

For each of the five Euclidean fields we also have the complete set of Bianchi newforms of dimension 1 (that is, with rational coefficients) for levels of norm up to a bound depending on the field, currently 100000, 50000, 150000, 50000, 50000 respectively. We also have dimension 2 newforms over $\mathbb{Q}(\sqrt{-1})$ for levels of norm up to $5000$. For each of these newforms the database contains several Hecke eigenvalues.

Browse Bianchi modular forms

Browse newforms by base field: \(\Q(\sqrt{-1})\), \(\Q(\sqrt{-2})\), \(\Q(\sqrt{-3})\), \(\Q(\sqrt{-7})\), \(\Q(\sqrt{-11})\)

Browse newform spaces by base field:

Find a specific form or space by label


e.g. 2.0.4.1-65.2-a (single form) or 2.0.4.1-65.2 (space of forms at a level)

Examples of base change forms

A random Bianchi modular form from the database

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base field either a field label, e.g. 2.0.4.1 for \(\mathbb{Q}(\sqrt{-1})\), or a nickname, e.g. Qsqrt-1
level norm e.g. 1 or 1-100 dimension e.g. 1 or 2
sign   base change forms CM
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