Properties

Label 18.3.b
Level $18$
Weight $3$
Character orbit 18.b
Rep. character $\chi_{18}(17,\cdot)$
Character field $\Q$
Dimension $2$
Newform subspaces $1$
Sturm bound $9$
Trace bound $0$

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Defining parameters

Level: \( N \) \(=\) \( 18 = 2 \cdot 3^{2} \)
Weight: \( k \) \(=\) \( 3 \)
Character orbit: \([\chi]\) \(=\) 18.b (of order \(2\) and degree \(1\))
Character conductor: \(\operatorname{cond}(\chi)\) \(=\) \( 3 \)
Character field: \(\Q\)
Newform subspaces: \( 1 \)
Sturm bound: \(9\)
Trace bound: \(0\)

Dimensions

The following table gives the dimensions of various subspaces of \(M_{3}(18, [\chi])\).

Total New Old
Modular forms 10 2 8
Cusp forms 2 2 0
Eisenstein series 8 0 8

Trace form

\( 2 q - 4 q^{4} - 8 q^{7} + O(q^{10}) \) \( 2 q - 4 q^{4} - 8 q^{7} + 12 q^{10} + 16 q^{13} + 8 q^{16} - 32 q^{19} - 48 q^{22} + 14 q^{25} + 16 q^{28} + 88 q^{31} + 36 q^{34} - 68 q^{37} - 24 q^{40} - 80 q^{43} + 48 q^{46} - 66 q^{49} - 32 q^{52} + 144 q^{55} - 12 q^{58} + 100 q^{61} - 16 q^{64} + 16 q^{67} - 48 q^{70} - 32 q^{73} + 64 q^{76} - 152 q^{79} - 132 q^{82} - 108 q^{85} + 96 q^{88} - 64 q^{91} + 240 q^{94} + 352 q^{97} + O(q^{100}) \)

Decomposition of \(S_{3}^{\mathrm{new}}(18, [\chi])\) into newform subspaces

Label Char Prim Dim $A$ Field CM Minimal twist Traces Sato-Tate $q$-expansion
$a_{2}$ $a_{3}$ $a_{5}$ $a_{7}$
18.3.b.a 18.b 3.b $2$ $0.490$ \(\Q(\sqrt{-2}) \) None 18.3.b.a \(0\) \(0\) \(0\) \(-8\) $\mathrm{SU}(2)[C_{2}]$ \(q+\beta q^{2}-2q^{4}-3\beta q^{5}-4q^{7}-2\beta q^{8}+\cdots\)