Properties

Label 8.4.a
Level $8$
Weight $4$
Character orbit 8.a
Rep. character $\chi_{8}(1,\cdot)$
Character field $\Q$
Dimension $1$
Newform subspaces $1$
Sturm bound $4$
Trace bound $0$

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Defining parameters

Level: \( N \) \(=\) \( 8 = 2^{3} \)
Weight: \( k \) \(=\) \( 4 \)
Character orbit: \([\chi]\) \(=\) 8.a (trivial)
Character field: \(\Q\)
Newform subspaces: \( 1 \)
Sturm bound: \(4\)
Trace bound: \(0\)

Dimensions

The following table gives the dimensions of various subspaces of \(M_{4}(\Gamma_0(8))\).

Total New Old
Modular forms 5 1 4
Cusp forms 1 1 0
Eisenstein series 4 0 4

The following table gives the dimensions of the cuspidal new subspaces with specified eigenvalues for the Atkin-Lehner operators and the Fricke involution.

\(2\)Dim.
\(+\)\(1\)

Trace form

\( q - 4 q^{3} - 2 q^{5} + 24 q^{7} - 11 q^{9} + O(q^{10}) \) \( q - 4 q^{3} - 2 q^{5} + 24 q^{7} - 11 q^{9} - 44 q^{11} + 22 q^{13} + 8 q^{15} + 50 q^{17} + 44 q^{19} - 96 q^{21} - 56 q^{23} - 121 q^{25} + 152 q^{27} + 198 q^{29} - 160 q^{31} + 176 q^{33} - 48 q^{35} - 162 q^{37} - 88 q^{39} - 198 q^{41} + 52 q^{43} + 22 q^{45} + 528 q^{47} + 233 q^{49} - 200 q^{51} - 242 q^{53} + 88 q^{55} - 176 q^{57} - 668 q^{59} + 550 q^{61} - 264 q^{63} - 44 q^{65} + 188 q^{67} + 224 q^{69} + 728 q^{71} + 154 q^{73} + 484 q^{75} - 1056 q^{77} - 656 q^{79} - 311 q^{81} + 236 q^{83} - 100 q^{85} - 792 q^{87} + 714 q^{89} + 528 q^{91} + 640 q^{93} - 88 q^{95} - 478 q^{97} + 484 q^{99} + O(q^{100}) \)

Decomposition of \(S_{4}^{\mathrm{new}}(\Gamma_0(8))\) into newform subspaces

Label Char Prim Dim $A$ Field CM Traces A-L signs Sato-Tate $q$-expansion
$a_{2}$ $a_{3}$ $a_{5}$ $a_{7}$ 2
8.4.a.a 8.a 1.a $1$ $0.472$ \(\Q\) None \(0\) \(-4\) \(-2\) \(24\) $+$ $\mathrm{SU}(2)$ \(q-4q^{3}-2q^{5}+24q^{7}-11q^{9}-44q^{11}+\cdots\)