Space of modular forms of level 1728, weight 2, and Character 1728.bc

• Label: 1728.2.bc
• Level: $1728$
• Weight: $2$
• Character orbit: 1728.bc
• Rep. character: $\chi_{1728}(145,\cdot)$
• Character field: $\Q(\zeta_{12})$
• Dimension: $88$
• Newform subspaces: $5$
• Sturm bound: $576$
• Trace bound: $5$

Defining parameters

Level:	\( N \)	\(=\)	\( 1728 = 2^{6} \cdot 3^{3} \)
Weight:	\( k \)	\(=\)	\( 2 \)
Character orbit:	\([\chi]\)	\(=\)	1728.bc (of order \(12\) and degree \(4\))
Character conductor:	\(\operatorname{cond}(\chi)\)	\(=\)	\( 144 \)
Character field:			\(\Q(\zeta_{12})\)
Newform subspaces:			\( 5 \)
Sturm bound:			\(576\)
Trace bound:			\(5\)
Distinguishing \(T_p\):			\(5\)

Dimensions

The following table gives the dimensions of various subspaces of \(M_{2}(1728, [\chi])\).

	Total	New	Old
Modular forms	1248	104	1144
Cusp forms	1056	88	968
Eisenstein series	192	16	176

Trace form

\( 88 q + 2 q^{5} + O(q^{10}) \)

Decomposition of \(S_{2}^{\mathrm{new}}(1728, [\chi])\) 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
														$a_{2}$	$a_{3}$	$a_{5}$	$a_{7}$
1728.2.bc.a	$1728$	$2$	1728.bc	144.x	$12$	$4$	$1$	$13.798$	\(\Q(\zeta_{12})\)	None		$2$	$0$	\(0\)	\(0\)	\(-4\)	\(-6\)	$1$	$\mathrm{SU}(2)[C_{12}]$	\(q+(-2\zeta_{12}^{2}+2\zeta_{12}^{3})q^{5}+(-2-\zeta_{12}+\cdots)q^{7}+\cdots\)
1728.2.bc.b	$1728$	$2$	1728.bc	144.x	$12$	$4$	$1$	$13.798$	\(\Q(\zeta_{12})\)	None		$2$	$0$	\(0\)	\(0\)	\(-2\)	\(12\)	$1$	$\mathrm{SU}(2)[C_{12}]$	\(q+(-\zeta_{12}^{2}+\zeta_{12}^{3})q^{5}+(4-\zeta_{12}-2\zeta_{12}^{2}+\cdots)q^{7}+\cdots\)
1728.2.bc.c	$1728$	$2$	1728.bc	144.x	$12$	$4$	$1$	$13.798$	\(\Q(\zeta_{12})\)	None		$2$	$0$	\(0\)	\(0\)	\(4\)	\(-12\)	$1$	$\mathrm{SU}(2)[C_{12}]$	\(q+(1+\zeta_{12}-\zeta_{12}^{3})q^{5}+(-4-\zeta_{12}+\cdots)q^{7}+\cdots\)
1728.2.bc.d	$1728$	$2$	1728.bc	144.x	$12$	$4$	$1$	$13.798$	\(\Q(\zeta_{12})\)	None		$2$	$0$	\(0\)	\(0\)	\(8\)	\(6\)	$1$	$\mathrm{SU}(2)[C_{12}]$	\(q+(2+2\zeta_{12}-2\zeta_{12}^{3})q^{5}+(2-\zeta_{12}+\cdots)q^{7}+\cdots\)
1728.2.bc.e	$1728$	$2$	1728.bc	144.x	$12$	$72$	$18$	$13.798$		None		$4$	$0$	\(0\)	\(0\)	\(-4\)	\(0\)		$\mathrm{SU}(2)[C_{12}]$

Decomposition of \(S_{2}^{\mathrm{old}}(1728, [\chi])\) into lower level spaces

\( S_{2}^{\mathrm{old}}(1728, [\chi]) \cong \) \(S_{2}^{\mathrm{new}}(144, [\chi])\)\(^{\oplus 6}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(288, [\chi])\)\(^{\oplus 4}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(576, [\chi])\)\(^{\oplus 2}\)