Space of modular forms of level 1728, weight 2, and trivial character

• Label: 1728.2.a
• Level: $1728$
• Weight: $2$
• Character orbit: 1728.a
• Rep. character: $\chi_{1728}(1,\cdot)$
• Character field: $\Q$
• Dimension: $32$
• Newform subspaces: $30$
• Sturm bound: $576$
• Trace bound: $11$

Defining parameters

Level:	\( N \)	\(=\)	\( 1728 = 2^{6} \cdot 3^{3} \)
Weight:	\( k \)	\(=\)	\( 2 \)
Character orbit:	\([\chi]\)	\(=\)	1728.a (trivial)
Character field:			\(\Q\)
Newform subspaces:			\( 30 \)
Sturm bound:			\(576\)
Trace bound:			\(11\)
Distinguishing \(T_p\):			\(5\), \(7\), \(11\)

Dimensions

The following table gives the dimensions of various subspaces of \(M_{2}(\Gamma_0(1728))\).

	Total	New	Old
Modular forms	324	32	292
Cusp forms	253	32	221
Eisenstein series	71	0	71

The following table gives the dimensions of the cuspidal new subspaces with specified eigenvalues for the Atkin-Lehner operators and the Fricke involution.

\(2\)	\(3\)	Fricke	Dim
\(+\)	\(+\)	\(+\)	\(7\)
\(+\)	\(-\)	\(-\)	\(9\)
\(-\)	\(+\)	\(-\)	\(9\)
\(-\)	\(-\)	\(+\)	\(7\)
Plus space		\(+\)	\(14\)
Minus space		\(-\)	\(18\)

Trace form

\( 32 q + O(q^{10}) \)

Decomposition of \(S_{2}^{\mathrm{new}}(\Gamma_0(1728))\) into newform subspaces

Label	Level	Weight	Char	Prim	Char order	Dim	Rel. Dim	$A$	Field	CM	Self-dual	Twist minimal	Largest	Maximal	Minimal twist	Inner twists	Rank*	Traces					A-L signs		Fricke sign	Coefficient ring index	Sato-Tate	$q$-expansion
																		$a_{2}$	$a_{3}$	$a_{5}$	$a_{7}$		2	3
1728.2.a.a	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				216.2.a.a	$1$	$0$	\(0\)	\(0\)	\(-4\)	\(-3\)		$+$	$-$	$-$	$1$	$\mathrm{SU}(2)$	\(q-4q^{5}-3q^{7}-4q^{11}-q^{13}-4q^{17}+\cdots\)
1728.2.a.b	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				216.2.a.a	$1$	$0$	\(0\)	\(0\)	\(-4\)	\(3\)		$-$	$+$	$-$	$1$	$\mathrm{SU}(2)$	\(q-4q^{5}+3q^{7}+4q^{11}-q^{13}-4q^{17}+\cdots\)
1728.2.a.c	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				54.2.a.a	$1$	$1$	\(0\)	\(0\)	\(-3\)	\(-1\)		$+$	$+$	$+$	$1$	$\mathrm{SU}(2)$	\(q-3q^{5}-q^{7}+3q^{11}+4q^{13}-2q^{19}+\cdots\)
1728.2.a.d	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				54.2.a.a	$1$	$1$	\(0\)	\(0\)	\(-3\)	\(1\)		$-$	$-$	$+$	$1$	$\mathrm{SU}(2)$	\(q-3q^{5}+q^{7}-3q^{11}+4q^{13}+2q^{19}+\cdots\)
1728.2.a.e	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				864.2.a.a	$1$	$1$	\(0\)	\(0\)	\(-2\)	\(-3\)		$-$	$-$	$+$	$1$	$\mathrm{SU}(2)$	\(q-2q^{5}-3q^{7}+6q^{11}+3q^{13}-2q^{17}+\cdots\)
1728.2.a.f	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				864.2.a.b	$1$	$1$	\(0\)	\(0\)	\(-2\)	\(-1\)		$+$	$+$	$+$	$1$	$\mathrm{SU}(2)$	\(q-2q^{5}-q^{7}+2q^{11}-q^{13}+6q^{17}+\cdots\)
1728.2.a.g	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				864.2.a.b	$1$	$0$	\(0\)	\(0\)	\(-2\)	\(1\)		$+$	$-$	$-$	$1$	$\mathrm{SU}(2)$	\(q-2q^{5}+q^{7}-2q^{11}-q^{13}+6q^{17}+\cdots\)
1728.2.a.h	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				864.2.a.a	$1$	$0$	\(0\)	\(0\)	\(-2\)	\(3\)		$-$	$+$	$-$	$1$	$\mathrm{SU}(2)$	\(q-2q^{5}+3q^{7}-6q^{11}+3q^{13}-2q^{17}+\cdots\)
1728.2.a.i	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				216.2.a.b	$1$	$0$	\(0\)	\(0\)	\(-1\)	\(-3\)		$-$	$+$	$-$	$1$	$\mathrm{SU}(2)$	\(q-q^{5}-3q^{7}-5q^{11}-4q^{13}+8q^{17}+\cdots\)
1728.2.a.j	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				864.2.a.e	$1$	$0$	\(0\)	\(0\)	\(-1\)	\(-3\)		$-$	$+$	$-$	$1$	$\mathrm{SU}(2)$	\(q-q^{5}-3q^{7}+3q^{11}-4q^{17}+6q^{19}+\cdots\)
1728.2.a.k	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				864.2.a.e	$1$	$1$	\(0\)	\(0\)	\(-1\)	\(3\)		$-$	$-$	$+$	$1$	$\mathrm{SU}(2)$	\(q-q^{5}+3q^{7}-3q^{11}-4q^{17}-6q^{19}+\cdots\)
1728.2.a.l	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				216.2.a.b	$1$	$0$	\(0\)	\(0\)	\(-1\)	\(3\)		$+$	$-$	$-$	$1$	$\mathrm{SU}(2)$	\(q-q^{5}+3q^{7}+5q^{11}-4q^{13}+8q^{17}+\cdots\)
1728.2.a.m	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	\(\Q(\sqrt{-3}) \)	✓				108.2.a.a	$2$	$0$	\(0\)	\(0\)	\(0\)	\(-5\)		$-$	$+$	$-$	$1$	$N(\mathrm{U}(1))$	\(q-5q^{7}+7q^{13}-q^{19}-5q^{25}+4q^{31}+\cdots\)
1728.2.a.n	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	\(\Q(\sqrt{-3}) \)	✓				27.2.a.a	$2$	$1$	\(0\)	\(0\)	\(0\)	\(-1\)		$+$	$+$	$+$	$1$	$N(\mathrm{U}(1))$	\(q-q^{7}-5q^{13}+7q^{19}-5q^{25}-4q^{31}+\cdots\)
1728.2.a.o	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	\(\Q(\sqrt{-3}) \)	✓				27.2.a.a	$2$	$1$	\(0\)	\(0\)	\(0\)	\(1\)		$-$	$-$	$+$	$1$	$N(\mathrm{U}(1))$	\(q+q^{7}-5q^{13}-7q^{19}-5q^{25}+4q^{31}+\cdots\)
1728.2.a.p	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	\(\Q(\sqrt{-3}) \)	✓				108.2.a.a	$2$	$0$	\(0\)	\(0\)	\(0\)	\(5\)		$+$	$-$	$-$	$1$	$N(\mathrm{U}(1))$	\(q+5q^{7}+7q^{13}+q^{19}-5q^{25}-4q^{31}+\cdots\)
1728.2.a.q	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				864.2.a.e	$1$	$1$	\(0\)	\(0\)	\(1\)	\(-3\)		$-$	$-$	$+$	$1$	$\mathrm{SU}(2)$	\(q+q^{5}-3q^{7}-3q^{11}+4q^{17}+6q^{19}+\cdots\)
1728.2.a.r	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				216.2.a.b	$1$	$1$	\(0\)	\(0\)	\(1\)	\(-3\)		$-$	$-$	$+$	$1$	$\mathrm{SU}(2)$	\(q+q^{5}-3q^{7}+5q^{11}-4q^{13}-8q^{17}+\cdots\)
1728.2.a.s	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				216.2.a.b	$1$	$1$	\(0\)	\(0\)	\(1\)	\(3\)		$+$	$+$	$+$	$1$	$\mathrm{SU}(2)$	\(q+q^{5}+3q^{7}-5q^{11}-4q^{13}-8q^{17}+\cdots\)
1728.2.a.t	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				864.2.a.e	$1$	$0$	\(0\)	\(0\)	\(1\)	\(3\)		$-$	$+$	$-$	$1$	$\mathrm{SU}(2)$	\(q+q^{5}+3q^{7}+3q^{11}+4q^{17}-6q^{19}+\cdots\)
1728.2.a.u	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				864.2.a.a	$1$	$1$	\(0\)	\(0\)	\(2\)	\(-3\)		$-$	$-$	$+$	$1$	$\mathrm{SU}(2)$	\(q+2q^{5}-3q^{7}-6q^{11}+3q^{13}+2q^{17}+\cdots\)
1728.2.a.v	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				864.2.a.b	$1$	$1$	\(0\)	\(0\)	\(2\)	\(-1\)		$+$	$+$	$+$	$1$	$\mathrm{SU}(2)$	\(q+2q^{5}-q^{7}-2q^{11}-q^{13}-6q^{17}+\cdots\)
1728.2.a.w	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				864.2.a.b	$1$	$0$	\(0\)	\(0\)	\(2\)	\(1\)		$+$	$-$	$-$	$1$	$\mathrm{SU}(2)$	\(q+2q^{5}+q^{7}+2q^{11}-q^{13}-6q^{17}+\cdots\)
1728.2.a.x	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				864.2.a.a	$1$	$0$	\(0\)	\(0\)	\(2\)	\(3\)		$-$	$+$	$-$	$1$	$\mathrm{SU}(2)$	\(q+2q^{5}+3q^{7}+6q^{11}+3q^{13}+2q^{17}+\cdots\)
1728.2.a.y	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				54.2.a.a	$1$	$0$	\(0\)	\(0\)	\(3\)	\(-1\)		$+$	$-$	$-$	$1$	$\mathrm{SU}(2)$	\(q+3q^{5}-q^{7}-3q^{11}+4q^{13}-2q^{19}+\cdots\)
1728.2.a.z	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				54.2.a.a	$1$	$0$	\(0\)	\(0\)	\(3\)	\(1\)		$-$	$+$	$-$	$1$	$\mathrm{SU}(2)$	\(q+3q^{5}+q^{7}+3q^{11}+4q^{13}+2q^{19}+\cdots\)
1728.2.a.ba	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				216.2.a.a	$1$	$0$	\(0\)	\(0\)	\(4\)	\(-3\)		$+$	$-$	$-$	$1$	$\mathrm{SU}(2)$	\(q+4q^{5}-3q^{7}+4q^{11}-q^{13}+4q^{17}+\cdots\)
1728.2.a.bb	$1728$	$2$	1728.a	1.a	$1$	$1$	$1$	$13.798$	\(\Q\)	None	✓				216.2.a.a	$1$	$0$	\(0\)	\(0\)	\(4\)	\(3\)		$-$	$+$	$-$	$1$	$\mathrm{SU}(2)$	\(q+4q^{5}+3q^{7}-4q^{11}-q^{13}+4q^{17}+\cdots\)
1728.2.a.bc	$1728$	$2$	1728.a	1.a	$1$	$2$	$2$	$13.798$	\(\Q(\sqrt{13}) \)	None	✓		✓		864.2.a.m	$2$	$1$	\(0\)	\(0\)	\(0\)	\(0\)		$+$	$+$	$+$	$2$	$\mathrm{SU}(2)$	\(q-\beta q^{5}+\beta q^{7}-q^{11}-4q^{13}+2\beta q^{19}+\cdots\)
1728.2.a.bd	$1728$	$2$	1728.a	1.a	$1$	$2$	$2$	$13.798$	\(\Q(\sqrt{13}) \)	None	✓		✓		864.2.a.m	$2$	$0$	\(0\)	\(0\)	\(0\)	\(0\)		$+$	$-$	$-$	$2$	$\mathrm{SU}(2)$	\(q-\beta q^{5}-\beta q^{7}+q^{11}-4q^{13}-2\beta q^{19}+\cdots\)

Decomposition of \(S_{2}^{\mathrm{old}}(\Gamma_0(1728))\) into lower level spaces

\( S_{2}^{\mathrm{old}}(\Gamma_0(1728)) \simeq \) \(S_{2}^{\mathrm{new}}(\Gamma_0(24))\)\(^{\oplus 12}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(27))\)\(^{\oplus 7}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(32))\)\(^{\oplus 8}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(36))\)\(^{\oplus 10}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(48))\)\(^{\oplus 9}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(54))\)\(^{\oplus 6}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(64))\)\(^{\oplus 4}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(72))\)\(^{\oplus 8}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(96))\)\(^{\oplus 6}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(108))\)\(^{\oplus 5}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(144))\)\(^{\oplus 6}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(192))\)\(^{\oplus 3}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(216))\)\(^{\oplus 4}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(288))\)\(^{\oplus 4}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(432))\)\(^{\oplus 3}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(576))\)\(^{\oplus 2}\)\(\oplus\)\(S_{2}^{\mathrm{new}}(\Gamma_0(864))\)\(^{\oplus 2}\)