Properties

Label 38.120.8.d.1
Level $38$
Index $120$
Genus $8$
Analytic rank $0$
Cusps $6$
$\Q$-cusps $3$

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Invariants

Level: $38$ $\SL_2$-level: $38$ Newform level: $76$
Index: $120$ $\PSL_2$-index:$120$
Genus: $8 = 1 + \frac{ 120 }{12} - \frac{ 0 }{4} - \frac{ 0 }{3} - \frac{ 6 }{2}$
Cusps: $6$ (of which $3$ are rational) Cusp widths $2^{3}\cdot38^{3}$ Cusp orbits $1^{3}\cdot3$
Elliptic points: $0$ of order $2$ and $0$ of order $3$
Analytic rank: $0$
$\Q$-gonality: $3 \le \gamma \le 6$
$\overline{\Q}$-gonality: $3 \le \gamma \le 6$
Rational cusps: $3$
Rational CM points: none

Other labels

Cummins and Pauli (CP) label: 38B8
Rouse, Sutherland, and Zureick-Brown (RSZB) label: 38.120.8.5

Level structure

$\GL_2(\Z/38\Z)$-generators: $\begin{bmatrix}13&9\\31&18\end{bmatrix}$, $\begin{bmatrix}23&2\\18&29\end{bmatrix}$
Contains $-I$: yes
Quadratic refinements: 38.240.8-38.d.1.1, 38.240.8-38.d.1.2, 76.240.8-38.d.1.1, 76.240.8-38.d.1.2, 76.240.8-38.d.1.3, 76.240.8-38.d.1.4, 76.240.8-38.d.1.5, 76.240.8-38.d.1.6, 114.240.8-38.d.1.1, 114.240.8-38.d.1.2, 152.240.8-38.d.1.1, 152.240.8-38.d.1.2, 152.240.8-38.d.1.3, 152.240.8-38.d.1.4, 152.240.8-38.d.1.5, 152.240.8-38.d.1.6, 152.240.8-38.d.1.7, 152.240.8-38.d.1.8, 190.240.8-38.d.1.1, 190.240.8-38.d.1.2, 228.240.8-38.d.1.1, 228.240.8-38.d.1.2, 228.240.8-38.d.1.3, 228.240.8-38.d.1.4, 228.240.8-38.d.1.5, 228.240.8-38.d.1.6, 266.240.8-38.d.1.1, 266.240.8-38.d.1.2
Cyclic 38-isogeny field degree: $3$
Cyclic 38-torsion field degree: $54$
Full 38-torsion field degree: $6156$

Jacobian

Conductor: $2^{8}\cdot19^{8}$
Simple: no
Squarefree: yes
Decomposition: $1^{2}\cdot2\cdot4$
Newforms: 19.2.a.a, 38.2.c.a, 38.2.c.b, 76.2.a.a

Models

Canonical model in $\mathbb{P}^{ 7 }$ defined by 15 equations

$ 0 $ $=$ $ x y - x w + x t - 2 x v + x r - y w + w^{2} - w t + w v - w r $
$=$ $x^{2} - 3 x y - x w + x u + x r - y z + y w + y v + z r - w u + w r$
$=$ $x y + x z - x u + 2 x v - x r - y^{2} + y w - y v + y r - z w - z v + w u - w r$
$=$ $x^{2} + 2 x w + x t + x u - 2 x v - y^{2} + y w + y r - z^{2} + z v - z r + 3 w^{2} - w t - w u + \cdots - r^{2}$
$=$$\cdots$
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Singular plane model Singular plane model

$ 0 $ $=$ $ - 20 x^{12} - 48 x^{11} y + 44 x^{11} z - 48 x^{10} y^{2} + 66 x^{10} y z + 20 x^{10} z^{2} + \cdots + y^{4} z^{8} $
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Rational points

This modular curve has 3 rational cusps but no known non-cuspidal rational points. The following are the coordinates of the rational cusps on this modular curve.

Canonical model
$(0:0:-1/3:1/3:0:0:2/3:1)$, $(0:-1:0:-1:-1:0:0:1)$, $(0:1:-1:-1:0:-1:3:1)$

Maps between models of this curve

Birational map from canonical model to plane model:

$\displaystyle X$ $=$ $\displaystyle x$
$\displaystyle Y$ $=$ $\displaystyle y$
$\displaystyle Z$ $=$ $\displaystyle w$

Maps to other modular curves

$j$-invariant map of degree 120 from the canonical model of this modular curve to the modular curve $X(1)$ :

$\displaystyle j$ $=$ $\displaystyle 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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
38.40.2.a.1 $38$ $3$ $3$ $2$ $0$ $2\cdot4$

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

Covering curve Level Index Degree Genus Rank Kernel decomposition
38.360.22.a.2 $38$ $3$ $3$ $22$ $0$ $1^{6}\cdot2^{2}\cdot4$
38.360.22.c.2 $38$ $3$ $3$ $22$ $4$ $1^{2}\cdot2^{6}$
38.360.22.d.1 $38$ $3$ $3$ $22$ $2$ $1^{2}\cdot2^{4}\cdot4$
38.2280.161.f.1 $38$ $19$ $19$ $161$ $24$ $1^{7}\cdot2^{18}\cdot3^{2}\cdot4^{9}\cdot6^{6}\cdot8^{4}$
76.240.18.g.2 $76$ $2$ $2$ $18$ $?$ not computed
76.240.18.h.2 $76$ $2$ $2$ $18$ $?$ not computed
76.240.18.i.1 $76$ $2$ $2$ $18$ $?$ not computed
76.240.18.j.1 $76$ $2$ $2$ $18$ $?$ not computed
152.240.18.k.1 $152$ $2$ $2$ $18$ $?$ not computed
152.240.18.l.1 $152$ $2$ $2$ $18$ $?$ not computed
152.240.18.m.1 $152$ $2$ $2$ $18$ $?$ not computed
152.240.18.n.2 $152$ $2$ $2$ $18$ $?$ not computed
228.240.18.g.1 $228$ $2$ $2$ $18$ $?$ not computed
228.240.18.h.1 $228$ $2$ $2$ $18$ $?$ not computed
228.240.18.i.2 $228$ $2$ $2$ $18$ $?$ not computed
228.240.18.j.2 $228$ $2$ $2$ $18$ $?$ not computed
266.360.22.d.1 $266$ $3$ $3$ $22$ $?$ not computed
266.360.22.f.2 $266$ $3$ $3$ $22$ $?$ not computed
266.360.22.k.2 $266$ $3$ $3$ $22$ $?$ not computed
266.360.22.n.1 $266$ $3$ $3$ $22$ $?$ not computed
266.360.22.r.2 $266$ $3$ $3$ $22$ $?$ not computed
266.360.22.s.2 $266$ $3$ $3$ $22$ $?$ not computed