Defining parameters
| Level: | \( N \) | = | \( 8 = 2^{3} \) |
| Weight: | \( k \) | = | \( 4 \) |
| Nonzero newspaces: | \( 2 \) | ||
| Newform subspaces: | \( 2 \) | ||
| Sturm bound: | \(16\) | ||
| Trace bound: | \(1\) |
Dimensions
The following table gives the dimensions of various subspaces of \(M_{4}(\Gamma_1(8))\).
| Total | New | Old | |
|---|---|---|---|
| Modular forms | 9 | 5 | 4 |
| Cusp forms | 3 | 3 | 0 |
| Eisenstein series | 6 | 2 | 4 |
Trace form
Decomposition of \(S_{4}^{\mathrm{new}}(\Gamma_1(8))\)
We only show spaces with even parity, since no modular forms exist when this condition is not satisfied. Within each space \( S_k^{\mathrm{new}}(N, \chi) \) we list available newforms together with their dimension.
| Label | \(\chi\) | Newforms | Dimension | \(\chi\) degree |
|---|---|---|---|---|
| 8.4.a | \(\chi_{8}(1, \cdot)\) | 8.4.a.a | 1 | 1 |
| 8.4.b | \(\chi_{8}(5, \cdot)\) | 8.4.b.a | 2 | 1 |