Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [7920,2,Mod(1,7920)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(7920, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 0, 0, 0]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("7920.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 7920 = 2^{4} \cdot 3^{2} \cdot 5 \cdot 11 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 7920.a (trivial) |
Newform invariants
comment: select newform
sage: f = N[0] # Warning: the index may be different
gp: f = lf[1] \\ Warning: the index may be different
| Self dual: | yes |
| Analytic conductor: | \(63.2415184009\) |
| Analytic rank: | \(0\) |
| Dimension: | \(3\) |
| Coefficient field: | 3.3.1016.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{3} - x^{2} - 6x + 2 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 2 \) |
| Twist minimal: | no (minimal twist has level 3960) |
| Fricke sign: | \(-1\) |
| Sato-Tate group: | $\mathrm{SU}(2)$ |
$q$-expansion
comment: q-expansion
sage: f.q_expansion() # note that sage often uses an isomorphic number field
gp: mfcoefs(f, 20)
Coefficients of the \(q\)-expansion are expressed in terms of a basis \(1,\beta_1,\beta_2\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.
Basis of coefficient ring in terms of a root \(\nu\) of
\( x^{3} - x^{2} - 6x + 2 \)
:
| \(\beta_{1}\) | \(=\) |
\( 2\nu - 1 \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} - \nu - 4 \)
|
| \(\nu\) | \(=\) |
\( ( \beta _1 + 1 ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( 2\beta_{2} + \beta _1 + 9 ) / 2 \)
|
Embeddings
For each embedding \(\iota_m\) of the coefficient field, the values \(\iota_m(a_n)\) are shown below.
For more information on an embedded modular form you can click on its label.
comment: embeddings in the coefficient field
gp: mfembed(f)
| Label | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.1 |
|
0 | 0 | 0 | −1.00000 | 0 | −2.91852 | 0 | 0 | 0 | |||||||||||||||||||||||||||
| 1.2 | 0 | 0 | 0 | −1.00000 | 0 | −1.29966 | 0 | 0 | 0 | ||||||||||||||||||||||||||||
| 1.3 | 0 | 0 | 0 | −1.00000 | 0 | 4.21819 | 0 | 0 | 0 | ||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \( +1 \) |
| \(3\) | \( +1 \) |
| \(5\) | \( +1 \) |
| \(11\) | \( -1 \) |
Inner twists
This newform does not admit any (nontrivial) inner twists.
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 7920.2.a.ck | 3 | |
| 3.b | odd | 2 | 1 | 7920.2.a.cl | 3 | ||
| 4.b | odd | 2 | 1 | 3960.2.a.bg | ✓ | 3 | |
| 12.b | even | 2 | 1 | 3960.2.a.bh | yes | 3 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 3960.2.a.bg | ✓ | 3 | 4.b | odd | 2 | 1 | |
| 3960.2.a.bh | yes | 3 | 12.b | even | 2 | 1 | |
| 7920.2.a.ck | 3 | 1.a | even | 1 | 1 | trivial | |
| 7920.2.a.cl | 3 | 3.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(7920))\):
|
\( T_{7}^{3} - 14T_{7} - 16 \)
|
|
\( T_{13}^{3} - 4T_{13}^{2} - 26T_{13} + 96 \)
|
|
\( T_{17}^{3} + 6T_{17}^{2} - 2T_{17} - 36 \)
|
|
\( T_{19}^{3} + 2T_{19}^{2} - 24T_{19} - 16 \)
|
|
\( T_{23}^{3} + 2T_{23}^{2} - 24T_{23} - 16 \)
|
|
\( T_{29} + 2 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{3} \)
|
| $3$ |
\( T^{3} \)
|
| $5$ |
\( (T + 1)^{3} \)
|
| $7$ |
\( T^{3} - 14T - 16 \)
|
| $11$ |
\( (T - 1)^{3} \)
|
| $13$ |
\( T^{3} - 4 T^{2} + \cdots + 96 \)
|
| $17$ |
\( T^{3} + 6 T^{2} + \cdots - 36 \)
|
| $19$ |
\( T^{3} + 2 T^{2} + \cdots - 16 \)
|
| $23$ |
\( T^{3} + 2 T^{2} + \cdots - 16 \)
|
| $29$ |
\( (T + 2)^{3} \)
|
| $31$ |
\( T^{3} - 4 T^{2} + \cdots + 32 \)
|
| $37$ |
\( (T - 2)^{3} \)
|
| $41$ |
\( (T + 2)^{3} \)
|
| $43$ |
\( T^{3} - 2 T^{2} + \cdots + 156 \)
|
| $47$ |
\( T^{3} - 14 T^{2} + \cdots + 16 \)
|
| $53$ |
\( T^{3} + 6 T^{2} + \cdots - 232 \)
|
| $59$ |
\( T^{3} - 4 T^{2} + \cdots + 32 \)
|
| $61$ |
\( T^{3} - 228T - 16 \)
|
| $67$ |
\( T^{3} - 12 T^{2} + \cdots + 32 \)
|
| $71$ |
\( T^{3} - 10 T^{2} + \cdots - 72 \)
|
| $73$ |
\( T^{3} + 6 T^{2} + \cdots - 676 \)
|
| $79$ |
\( T^{3} - 4 T^{2} + \cdots - 288 \)
|
| $83$ |
\( T^{3} - 4 T^{2} + \cdots + 1832 \)
|
| $89$ |
\( T^{3} + 12 T^{2} + \cdots - 3456 \)
|
| $97$ |
\( T^{3} - 2 T^{2} + \cdots - 872 \)
|
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