Defining parameters
| Level: | \( N \) | \(=\) | \( 855 = 3^{2} \cdot 5 \cdot 19 \) |
| Weight: | \( k \) | \(=\) | \( 1 \) |
| Character orbit: | \([\chi]\) | \(=\) | 855.g (of order \(2\) and degree \(1\)) |
| Character conductor: | \(\operatorname{cond}(\chi)\) | \(=\) | \( 95 \) |
| Character field: | \(\Q\) | ||
| Newform subspaces: | \( 3 \) | ||
| Sturm bound: | \(120\) | ||
| Trace bound: | \(4\) |
Dimensions
The following table gives the dimensions of various subspaces of \(M_{1}(855, [\chi])\).
| Total | New | Old | |
|---|---|---|---|
| Modular forms | 22 | 7 | 15 |
| Cusp forms | 14 | 5 | 9 |
| Eisenstein series | 8 | 2 | 6 |
The following table gives the dimensions of subspaces with specified projective image type.
| \(D_n\) | \(A_4\) | \(S_4\) | \(A_5\) | |
|---|---|---|---|---|
| Dimension | 5 | 0 | 0 | 0 |
Trace form
Decomposition of \(S_{1}^{\mathrm{new}}(855, [\chi])\) into newform subspaces
| Label | Dim | $A$ | Field | Image | CM | RM | Traces | $q$-expansion | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| $a_{2}$ | $a_{3}$ | $a_{5}$ | $a_{7}$ | ||||||||
| 855.1.g.a | $1$ | $0.427$ | \(\Q\) | $D_{2}$ | \(\Q(\sqrt{-19}) \), \(\Q(\sqrt{-95}) \) | \(\Q(\sqrt{5}) \) | \(0\) | \(0\) | \(-1\) | \(0\) | \(q-q^{4}-q^{5}+2q^{11}+q^{16}+q^{19}+\cdots\) |
| 855.1.g.b | $2$ | $0.427$ | \(\Q(\sqrt{-1}) \) | $D_{2}$ | \(\Q(\sqrt{-15}) \), \(\Q(\sqrt{-19}) \) | \(\Q(\sqrt{285}) \) | \(0\) | \(0\) | \(0\) | \(0\) | \(q-q^{4}-iq^{5}+q^{16}-iq^{17}-q^{19}+\cdots\) |
| 855.1.g.c | $2$ | $0.427$ | \(\Q(\sqrt{2}) \) | $D_{4}$ | \(\Q(\sqrt{-95}) \) | None | \(0\) | \(0\) | \(2\) | \(0\) | \(q-\beta q^{2}+q^{4}+q^{5}-\beta q^{10}+\beta q^{13}+\cdots\) |
Decomposition of \(S_{1}^{\mathrm{old}}(855, [\chi])\) into lower level spaces
\( S_{1}^{\mathrm{old}}(855, [\chi]) \cong \)