Space of modular forms of level 2160, weight 1, and Character 2160.bu

• Label: 2160.1.bu
• Level: $2160$
• Weight: $1$
• Character orbit: 2160.bu
• Rep. character: $\chi_{2160}(559,\cdot)$
• Character field: $\Q(\zeta_{6})$
• Dimension: $4$
• Newform subspaces: $1$
• Sturm bound: $432$
• Trace bound: $0$

Defining parameters

Level:	\( N \)	\(=\)	\( 2160 = 2^{4} \cdot 3^{3} \cdot 5 \)
Weight:	\( k \)	\(=\)	\( 1 \)
Character orbit:	\([\chi]\)	\(=\)	2160.bu (of order \(6\) and degree \(2\))
Character conductor:	\(\operatorname{cond}(\chi)\)	\(=\)	\( 180 \)
Character field:			\(\Q(\zeta_{6})\)
Newform subspaces:			\( 1 \)
Sturm bound:			\(432\)
Trace bound:			\(0\)

Dimensions

The following table gives the dimensions of various subspaces of \(M_{1}(2160, [\chi])\).

	Total	New	Old
Modular forms	120	4	116
Cusp forms	48	4	44
Eisenstein series	72	0	72

The following table gives the dimensions of subspaces with specified projective image type.

	\(D_n\)	\(A_4\)	\(S_4\)	\(A_5\)
Dimension	4	0	0	0

Trace form

\( 4 q - 2 q^{5} + O(q^{10}) \)

Decomposition of \(S_{1}^{\mathrm{new}}(2160, [\chi])\) into newform subspaces

Label	Level	Weight	Char	Prim	Char order	Dim	Rel. Dim	$A$	Field	Image	CM	RM	Self-dual	Inner twists	Rank*	Traces				Coefficient ring index	Sato-Tate	$q$-expansion
																$a_{2}$	$a_{3}$	$a_{5}$	$a_{7}$
2160.1.bu.a	$2160$	$1$	2160.bu	180.p	$6$	$4$	$2$	$1.078$	\(\Q(\zeta_{12})\)	$D_{6}$	\(\Q(\sqrt{-5}) \)	None		$8$	$0$	\(0\)	\(0\)	\(-2\)	\(0\)	$3$		\(q+\zeta_{12}^{4}q^{5}+(\zeta_{12}+\zeta_{12}^{3})q^{7}+(\zeta_{12}^{3}+\cdots)q^{23}+\cdots\)

Decomposition of \(S_{1}^{\mathrm{old}}(2160, [\chi])\) into lower level spaces

\( S_{1}^{\mathrm{old}}(2160, [\chi]) \cong \) \(S_{1}^{\mathrm{new}}(180, [\chi])\)\(^{\oplus 6}\)\(\oplus\)\(S_{1}^{\mathrm{new}}(360, [\chi])\)\(^{\oplus 4}\)\(\oplus\)\(S_{1}^{\mathrm{new}}(720, [\chi])\)\(^{\oplus 2}\)