Properties

Label 38.7.b
Level $38$
Weight $7$
Character orbit 38.b
Rep. character $\chi_{38}(37,\cdot)$
Character field $\Q$
Dimension $10$
Newform subspaces $1$
Sturm bound $35$
Trace bound $0$

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Defining parameters

Level: \( N \) \(=\) \( 38 = 2 \cdot 19 \)
Weight: \( k \) \(=\) \( 7 \)
Character orbit: \([\chi]\) \(=\) 38.b (of order \(2\) and degree \(1\))
Character conductor: \(\operatorname{cond}(\chi)\) \(=\) \( 19 \)
Character field: \(\Q\)
Newform subspaces: \( 1 \)
Sturm bound: \(35\)
Trace bound: \(0\)

Dimensions

The following table gives the dimensions of various subspaces of \(M_{7}(38, [\chi])\).

Total New Old
Modular forms 32 10 22
Cusp forms 28 10 18
Eisenstein series 4 0 4

Trace form

\( 10 q - 320 q^{4} - 112 q^{5} + 160 q^{6} - 224 q^{7} - 2890 q^{9} + O(q^{10}) \) \( 10 q - 320 q^{4} - 112 q^{5} + 160 q^{6} - 224 q^{7} - 2890 q^{9} + 3644 q^{11} + 10240 q^{16} - 10420 q^{17} - 17230 q^{19} + 3584 q^{20} + 37712 q^{23} - 5120 q^{24} - 52078 q^{25} - 7104 q^{26} + 7168 q^{28} + 94688 q^{30} - 161720 q^{35} + 92480 q^{36} + 25152 q^{38} - 78876 q^{39} + 53792 q^{42} + 6308 q^{43} - 116608 q^{44} + 309808 q^{45} + 322220 q^{47} - 235770 q^{49} - 321728 q^{54} - 377880 q^{55} + 24228 q^{57} + 445920 q^{58} + 426304 q^{61} + 59424 q^{62} - 517916 q^{63} - 327680 q^{64} - 1417312 q^{66} + 333440 q^{68} - 786076 q^{73} - 293280 q^{74} + 551360 q^{76} + 2303716 q^{77} - 114688 q^{80} + 5261090 q^{81} - 455136 q^{82} - 101500 q^{83} - 1261380 q^{85} - 2460732 q^{87} - 1206784 q^{92} - 2827032 q^{93} + 3106292 q^{95} + 163840 q^{96} + 1061428 q^{99} + O(q^{100}) \)

Decomposition of \(S_{7}^{\mathrm{new}}(38, [\chi])\) into newform subspaces

Label Char Prim Dim $A$ Field CM Traces Sato-Tate $q$-expansion
$a_{2}$ $a_{3}$ $a_{5}$ $a_{7}$
38.7.b.a 38.b 19.b $10$ $8.742$ \(\mathbb{Q}[x]/(x^{10} + \cdots)\) None \(0\) \(0\) \(-112\) \(-224\) $\mathrm{SU}(2)[C_{2}]$ \(q-\beta _{6}q^{2}+(\beta _{5}+\beta _{6})q^{3}-2^{5}q^{4}+(-11+\cdots)q^{5}+\cdots\)

Decomposition of \(S_{7}^{\mathrm{old}}(38, [\chi])\) into lower level spaces

\( S_{7}^{\mathrm{old}}(38, [\chi]) \cong \) \(S_{7}^{\mathrm{new}}(19, [\chi])\)\(^{\oplus 2}\)