Space of modular forms of level 12, weight 18, and Character 12.b

• Label: 12.18.b
• Level: $12$
• Weight: $18$
• Character orbit: 12.b
• Rep. character: $\chi_{12}(11,\cdot)$
• Character field: $\Q$
• Dimension: $32$
• Newform subspaces: $1$
• Sturm bound: $36$
• Trace bound: $0$

Defining parameters

Level:	\( N \)	\(=\)	\( 12 = 2^{2} \cdot 3 \)
Weight:	\( k \)	\(=\)	\( 18 \)
Character orbit:	\([\chi]\)	\(=\)	12.b (of order \(2\) and degree \(1\))
Character conductor:	\(\operatorname{cond}(\chi)\)	\(=\)	\( 12 \)
Character field:			\(\Q\)
Newform subspaces:			\( 1 \)
Sturm bound:			\(36\)
Trace bound:			\(0\)

Dimensions

The following table gives the dimensions of various subspaces of \(M_{18}(12, [\chi])\).

	Total	New	Old
Modular forms	36	36	0
Cusp forms	32	32	0
Eisenstein series	4	4	0

Trace form

\( 32 q - 54808 q^{4} - 4960776 q^{6} + 79874976 q^{9} + O(q^{10}) \)

Decomposition of \(S_{18}^{\mathrm{new}}(12, [\chi])\) into newform subspaces

Label	Level	Weight	Char	Prim	Char order	Dim	Rel. Dim	$A$	Field	CM	Self-dual	Inner twists	Rank*	Traces				Coefficient ring index	Sato-Tate	$q$-expansion
														$a_{2}$	$a_{3}$	$a_{5}$	$a_{7}$
12.18.b.a	$12$	$18$	12.b	12.b	$2$	$32$	$32$	$21.987$		None		$4$	$0$	\(0\)	\(0\)	\(0\)	\(0\)		$\mathrm{SU}(2)[C_{2}]$