Properties

Label 40.96.1.cs.2
Level $40$
Index $96$
Genus $1$
Analytic rank $1$
Cusps $16$
$\Q$-cusps $0$

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Invariants

Level: $40$ $\SL_2$-level: $8$ Newform level: $800$
Index: $96$ $\PSL_2$-index:$96$
Genus: $1 = 1 + \frac{ 96 }{12} - \frac{ 0 }{4} - \frac{ 0 }{3} - \frac{ 16 }{2}$
Cusps: $16$ (none of which are rational) Cusp widths $4^{8}\cdot8^{8}$ Cusp orbits $2^{2}\cdot4^{3}$
Elliptic points: $0$ of order $2$ and $0$ of order $3$
Analytic rank: $1$
$\Q$-gonality: $2$
$\overline{\Q}$-gonality: $2$
Rational cusps: $0$
Rational CM points: none

Other labels

Cummins and Pauli (CP) label: 8K1
Rouse, Sutherland, and Zureick-Brown (RSZB) label: 40.96.1.625

Level structure

$\GL_2(\Z/40\Z)$-generators: $\begin{bmatrix}5&16\\4&9\end{bmatrix}$, $\begin{bmatrix}23&26\\11&1\end{bmatrix}$, $\begin{bmatrix}39&2\\16&25\end{bmatrix}$
Contains $-I$: yes
Quadratic refinements: none in database
Cyclic 40-isogeny field degree: $12$
Cyclic 40-torsion field degree: $96$
Full 40-torsion field degree: $7680$

Jacobian

Conductor: $2^{5}\cdot5^{2}$
Simple: yes
Squarefree: yes
Decomposition: $1$
Newforms: 800.2.a.d

Models

Embedded model Embedded model in $\mathbb{P}^{3}$

$ 0 $ $=$ $ x^{2} - x z - 2 y w - z^{2} $
$=$ $3 x^{2} + 2 x z + 2 y^{2} + 2 z^{2} - 2 w^{2}$
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Singular plane model Singular plane model

$ 0 $ $=$ $ 100 x^{4} + 30 x^{2} y^{2} + 40 x^{2} y z - 30 x^{2} z^{2} + y^{4} + 6 y^{3} z + 7 y^{2} z^{2} + \cdots + z^{4} $
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Rational points

This modular curve has real points and $\Q_p$ points for $p$ not dividing the level, but no known rational points.

Maps between models of this curve

Birational map from embedded model to plane model:

$\displaystyle X$ $=$ $\displaystyle z$
$\displaystyle Y$ $=$ $\displaystyle 2y$
$\displaystyle Z$ $=$ $\displaystyle 2w$

Maps to other modular curves

$j$-invariant map of degree 96 from the embedded model of this modular curve to the modular curve $X(1)$ :

$\displaystyle j$ $=$ $\displaystyle -\frac{99618750000000xyz^{21}w-7482425000000000xyz^{19}w^{3}+142988908500000000xyz^{17}w^{5}-1080845148800000000xyz^{15}w^{7}+3830887459800000000xyz^{13}w^{9}-6813856941216000000xyz^{11}w^{11}+6115042854432000000xyz^{9}w^{13}-2620123322398720000xyz^{7}w^{15}+462422081387520000xyz^{5}w^{17}-23671044534272000xyz^{3}w^{19}+155729335910400xyzw^{21}+11320312500000xz^{23}-2722889062500000xz^{21}w^{2}+93164971875000000xz^{19}w^{4}-1073431061750000000xz^{17}w^{6}+5436440057250000000xz^{15}w^{8}-13536240326580000000xz^{13}w^{10}+17212818865320000000xz^{11}w^{12}-10999227976656000000xz^{9}w^{14}+3270373206216960000xz^{7}w^{16}-379979999628800000xz^{5}w^{18}+11990542364467200xz^{3}w^{20}-53671118684160xzw^{22}+71692968750000yz^{22}w-7093852812500000yz^{20}w^{3}+174192789875000000yz^{18}w^{5}-1672962998750000000yz^{16}w^{7}+7537612298700000000yz^{14}w^{9}-17257299428616000000yz^{12}w^{11}+20499733362057600000yz^{10}w^{13}-12255270609276160000yz^{8}w^{15}+3342299325982720000yz^{6}w^{17}-331182189498368000yz^{4}w^{19}+6846291743539200yz^{2}w^{21}-9403378237440yw^{23}+6996337890625z^{24}-1764055078125000z^{22}w^{2}+63196726640625000z^{20}w^{4}-764374415562500000z^{18}w^{6}+4099809057093750000z^{16}w^{8}-11021918704320000000z^{14}w^{10}+15727314277220000000z^{12}w^{12}-12156217790668800000z^{10}w^{14}+5048358793757280000z^{8}w^{16}-1067730663960320000z^{6}w^{18}+95597490837964800z^{4}w^{20}-2014782954332160z^{2}w^{22}+2847113842688w^{24}}{w^{4}(475664062500xyz^{17}w-23421325000000xyz^{15}w^{3}+284654606250000xyz^{13}w^{5}-1324585535000000xyz^{11}w^{7}+2782421997000000xyz^{9}w^{9}-2786631180480000xyz^{7}w^{11}+1298183563872000xyz^{5}w^{13}-247206610713600xyz^{3}w^{15}+13038366320640xyzw^{17}+66064453125xz^{19}-10534621093750xz^{17}w^{2}+232265254687500xz^{15}w^{4}-1673747354375000xz^{13}w^{6}+5134290476250000xz^{11}w^{8}-7446253250500000xz^{9}w^{10}+5216079458280000xz^{7}w^{12}-1672827475536000xz^{5}w^{14}+207279970444800xz^{3}w^{16}-6124484597760xzw^{18}+353066406250yz^{18}w-24060132812500yz^{16}w^{3}+391369721875000yz^{14}w^{5}-2401278571250000yz^{12}w^{7}+6655628370100000yz^{10}w^{9}-8955584740440000yz^{8}w^{11}+5856928845840000yz^{6}w^{13}-1724491042502400yz^{4}w^{15}+182596366679040yz^{2}w^{17}-3139403857920yw^{19}+40830078125z^{20}-6894449218750z^{18}w^{2}+160694515625000z^{16}w^{4}-1230443995625000z^{14}w^{6}+4077429313750000z^{12}w^{8}-6624866545900000z^{10}w^{10}+5589825014440000z^{8}w^{12}-2482620600240000z^{6}w^{14}+556204697395200z^{4}w^{16}-52241533148160z^{2}w^{18}+950535005184w^{20})}$

Modular covers

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Cover information

Click on a modular curve in the diagram to see information about it.

This modular curve minimally covers the modular curves listed below.

Covered curve Level Index Degree Genus Rank Kernel decomposition
8.48.0.q.1 $8$ $2$ $2$ $0$ $0$ full Jacobian
40.48.0.bs.2 $40$ $2$ $2$ $0$ $0$ full Jacobian
40.48.1.ib.1 $40$ $2$ $2$ $1$ $1$ dimension zero

This modular curve is minimally covered by the modular curves in the database listed below.

Covering curve Level Index Degree Genus Rank Kernel decomposition
40.480.33.dwb.1 $40$ $5$ $5$ $33$ $7$ $1^{14}\cdot2^{9}$
40.576.33.crv.1 $40$ $6$ $6$ $33$ $4$ $1^{14}\cdot2\cdot4^{4}$
40.960.65.eaz.1 $40$ $10$ $10$ $65$ $9$ $1^{28}\cdot2^{10}\cdot4^{4}$
120.288.17.ddcj.1 $120$ $3$ $3$ $17$ $?$ not computed
120.384.17.fkq.1 $120$ $4$ $4$ $17$ $?$ not computed