Space of modular forms of level 80, weight 4, and Character 80.l

• Label: 80.4.l
• Level: $80$
• Weight: $4$
• Character orbit: 80.l
• Rep. character: $\chi_{80}(21,\cdot)$
• Character field: $\Q(\zeta_{4})$
• Dimension: $48$
• Newform subspaces: $1$
• Sturm bound: $48$
• Trace bound: $0$

Defining parameters

Level:	\( N \)	\(=\)	\( 80 = 2^{4} \cdot 5 \)
Weight:	\( k \)	\(=\)	\( 4 \)
Character orbit:	\([\chi]\)	\(=\)	80.l (of order \(4\) and degree \(2\))
Character conductor:	\(\operatorname{cond}(\chi)\)	\(=\)	\( 16 \)
Character field:			\(\Q(i)\)
Newform subspaces:			\( 1 \)
Sturm bound:			\(48\)
Trace bound:			\(0\)

Dimensions

The following table gives the dimensions of various subspaces of \(M_{4}(80, [\chi])\).

	Total	New	Old
Modular forms	76	48	28
Cusp forms	68	48	20
Eisenstein series	8	0	8

Trace form

\( 48 q - 20 q^{4} + 60 q^{6} + O(q^{10}) \)

Decomposition of \(S_{4}^{\mathrm{new}}(80, [\chi])\) 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
														$a_{2}$	$a_{3}$	$a_{5}$	$a_{7}$
80.4.l.a	$80$	$4$	80.l	16.e	$4$	$48$	$24$	$4.720$		None		$2$	$0$	\(0\)	\(0\)	\(0\)	\(0\)		$\mathrm{SU}(2)[C_{4}]$

Decomposition of \(S_{4}^{\mathrm{old}}(80, [\chi])\) into lower level spaces

\( S_{4}^{\mathrm{old}}(80, [\chi]) \cong \) \(S_{4}^{\mathrm{new}}(16, [\chi])\)\(^{\oplus 2}\)