Properties

Label 13.4.b
Level $13$
Weight $4$
Character orbit 13.b
Rep. character $\chi_{13}(12,\cdot)$
Character field $\Q$
Dimension $2$
Newform subspaces $1$
Sturm bound $4$
Trace bound $0$

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Defining parameters

Level: \( N \) \(=\) \( 13 \)
Weight: \( k \) \(=\) \( 4 \)
Character orbit: \([\chi]\) \(=\) 13.b (of order \(2\) and degree \(1\))
Character conductor: \(\operatorname{cond}(\chi)\) \(=\) \( 13 \)
Character field: \(\Q\)
Newform subspaces: \( 1 \)
Sturm bound: \(4\)
Trace bound: \(0\)

Dimensions

The following table gives the dimensions of various subspaces of \(M_{4}(13, [\chi])\).

Total New Old
Modular forms 4 4 0
Cusp forms 2 2 0
Eisenstein series 2 2 0

Trace form

\( 2 q - 2 q^{3} - 2 q^{4} - 52 q^{9} + O(q^{10}) \) \( 2 q - 2 q^{3} - 2 q^{4} - 52 q^{9} + 54 q^{10} + 2 q^{12} + 52 q^{13} + 90 q^{14} - 142 q^{16} - 90 q^{17} - 288 q^{22} + 324 q^{23} + 88 q^{25} + 234 q^{26} + 106 q^{27} - 288 q^{29} - 54 q^{30} - 270 q^{35} + 52 q^{36} - 36 q^{38} - 52 q^{39} + 378 q^{40} - 90 q^{42} - 194 q^{43} + 142 q^{48} + 236 q^{49} + 90 q^{51} - 52 q^{52} - 828 q^{53} + 864 q^{55} + 630 q^{56} + 752 q^{61} - 1584 q^{62} - 866 q^{64} - 702 q^{65} + 288 q^{66} + 90 q^{68} - 324 q^{69} + 1818 q^{74} - 88 q^{75} + 1440 q^{77} - 234 q^{78} - 1660 q^{79} + 1298 q^{81} + 1152 q^{82} + 288 q^{87} - 2016 q^{88} - 1404 q^{90} - 1170 q^{91} - 324 q^{92} + 666 q^{94} + 108 q^{95} + O(q^{100}) \)

Decomposition of \(S_{4}^{\mathrm{new}}(13, [\chi])\) into newform subspaces

Label Dim. \(A\) Field CM Traces $q$-expansion
\(a_2\) \(a_3\) \(a_5\) \(a_7\)
13.4.b.a \(2\) \(0.767\) \(\Q(\sqrt{-1}) \) None \(0\) \(-2\) \(0\) \(0\) \(q+iq^{2}-q^{3}-q^{4}-3iq^{5}-iq^{6}+\cdots\)