Invariants
Level: | $40$ | $\SL_2$-level: | $20$ | Newform level: | $1600$ | ||
Index: | $192$ | $\PSL_2$-index: | $96$ | ||||
Genus: | $5 = 1 + \frac{ 96 }{12} - \frac{ 0 }{4} - \frac{ 0 }{3} - \frac{ 8 }{2}$ | ||||||
Cusps: | $8$ (none of which are rational) | Cusp widths | $4^{4}\cdot20^{4}$ | Cusp orbits | $2^{2}\cdot4$ | ||
Elliptic points: | $0$ of order $2$ and $0$ of order $3$ | ||||||
Analytic rank: | $1$ | ||||||
$\Q$-gonality: | $4$ | ||||||
$\overline{\Q}$-gonality: | $4$ | ||||||
Rational cusps: | $0$ | ||||||
Rational CM points: | none |
Other labels
Cummins and Pauli (CP) label: | 20D5 |
Rouse, Sutherland, and Zureick-Brown (RSZB) label: | 40.192.5.124 |
Level structure
$\GL_2(\Z/40\Z)$-generators: | $\begin{bmatrix}1&36\\25&7\end{bmatrix}$, $\begin{bmatrix}31&27\\2&1\end{bmatrix}$, $\begin{bmatrix}38&15\\17&21\end{bmatrix}$ |
Contains $-I$: | no $\quad$ (see 40.96.5.n.2 for the level structure with $-I$) |
Cyclic 40-isogeny field degree: | $12$ |
Cyclic 40-torsion field degree: | $192$ |
Full 40-torsion field degree: | $3840$ |
Jacobian
Conductor: | $2^{24}\cdot5^{7}$ |
Simple: | no |
Squarefree: | yes |
Decomposition: | $1^{3}\cdot2$ |
Newforms: | 80.2.a.a, 80.2.c.a, 1600.2.a.c, 1600.2.a.w |
Models
Canonical model in $\mathbb{P}^{ 4 }$ defined by 3 equations
$ 0 $ | $=$ | $ x^{2} + 3 x y + y^{2} + z t - w^{2} $ |
$=$ | $2 x w - 2 y w - 3 z^{2} - 2 z t + 2 w^{2}$ | |
$=$ | $2 x^{2} + x y + 2 y^{2} + 2 z^{2} + z t + 3 w^{2} - 2 t^{2}$ |
Singular plane model Singular plane model
$ 0 $ | $=$ | $ 100 x^{4} y^{4} - 100 x^{4} y^{2} z^{2} + 25 x^{4} z^{4} - 1360 x^{2} y^{6} + 360 x^{2} y^{4} z^{2} + \cdots + 25 z^{8} $ |
Rational points
This modular curve has real points and $\Q_p$ points for $p$ not dividing the level, but no known rational points.
Maps to other modular curves
Map of degree 2 from the canonical model of this modular curve to the canonical model of the modular curve 20.48.3.i.2 :
$\displaystyle X$ | $=$ | $\displaystyle 3x+2y+3w$ |
$\displaystyle Y$ | $=$ | $\displaystyle 4x+y-w$ |
$\displaystyle Z$ | $=$ | $\displaystyle 2x-2y+2w$ |
Equation of the image curve:
$0$ | $=$ | $ 6X^{3}Y-22X^{2}Y^{2}+6XY^{3}+12X^{2}YZ+14XY^{2}Z-6Y^{3}Z-3X^{2}Z^{2}-2XYZ^{2}+5Y^{2}Z^{2}-10YZ^{3}+2Z^{4} $ |
Map of degree 1 from the canonical model of this modular curve to the plane model of the modular curve 40.96.5.n.2 :
$\displaystyle X$ | $=$ | $\displaystyle x+y$ |
$\displaystyle Y$ | $=$ | $\displaystyle \frac{1}{2}z$ |
$\displaystyle Z$ | $=$ | $\displaystyle w$ |
Equation of the image curve:
$0$ | $=$ | $ 100X^{4}Y^{4}-100X^{4}Y^{2}Z^{2}+25X^{4}Z^{4}-1360X^{2}Y^{6}+360X^{2}Y^{4}Z^{2}+100X^{2}Y^{2}Z^{4}-50X^{2}Z^{6}+4624Y^{8}-1824Y^{6}Z^{2}+1464Y^{4}Z^{4}-360Y^{2}Z^{6}+25Z^{8} $ |
Modular covers
This modular curve minimally covers the modular curves listed below.
Covered curve | Level | Index | Degree | Genus | Rank | Kernel decomposition |
---|---|---|---|---|---|---|
20.96.3-20.i.2.6 | $20$ | $2$ | $2$ | $3$ | $0$ | $1^{2}$ |
40.48.1-40.cj.2.5 | $40$ | $4$ | $4$ | $1$ | $0$ | $1^{2}\cdot2$ |
40.96.3-20.i.2.8 | $40$ | $2$ | $2$ | $3$ | $0$ | $1^{2}$ |
This modular curve is minimally covered by the modular curves in the database listed below.
Covering curve | Level | Index | Degree | Genus | Rank | Kernel decomposition |
---|---|---|---|---|---|---|
40.576.13-40.uw.2.2 | $40$ | $3$ | $3$ | $13$ | $3$ | $1^{4}\cdot2^{2}$ |
40.768.25-40.s.1.1 | $40$ | $4$ | $4$ | $25$ | $4$ | $1^{8}\cdot2^{4}\cdot4$ |
40.960.29-40.bbr.1.1 | $40$ | $5$ | $5$ | $29$ | $6$ | $1^{12}\cdot2^{6}$ |