Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [418,2,Mod(1,418)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(418, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([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("418.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 418 = 2 \cdot 11 \cdot 19 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 418.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: | \(3.33774680449\) |
| Analytic rank: | \(1\) |
| Dimension: | \(3\) |
| Coefficient field: | 3.3.621.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{3} - 6x - 3 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| 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
\( x^{3} - 6x - 3 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} - \nu - 4 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{2} + \beta _1 + 4 \)
|
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 |
|
−1.00000 | −2.14510 | 1.00000 | −1.60147 | 2.14510 | 2.89167 | −1.00000 | 1.60147 | 1.60147 | |||||||||||||||||||||||||||
| 1.2 | −1.00000 | −0.523976 | 1.00000 | 2.72545 | 0.523976 | −4.67750 | −1.00000 | −2.72545 | −2.72545 | ||||||||||||||||||||||||||||
| 1.3 | −1.00000 | 2.66908 | 1.00000 | −4.12398 | −2.66908 | −4.21417 | −1.00000 | 4.12398 | 4.12398 | ||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \( +1 \) |
| \(11\) | \( +1 \) |
| \(19\) | \( +1 \) |
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 | 418.2.a.g | ✓ | 3 |
| 3.b | odd | 2 | 1 | 3762.2.a.bg | 3 | ||
| 4.b | odd | 2 | 1 | 3344.2.a.q | 3 | ||
| 11.b | odd | 2 | 1 | 4598.2.a.bo | 3 | ||
| 19.b | odd | 2 | 1 | 7942.2.a.bi | 3 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 418.2.a.g | ✓ | 3 | 1.a | even | 1 | 1 | trivial |
| 3344.2.a.q | 3 | 4.b | odd | 2 | 1 | ||
| 3762.2.a.bg | 3 | 3.b | odd | 2 | 1 | ||
| 4598.2.a.bo | 3 | 11.b | odd | 2 | 1 | ||
| 7942.2.a.bi | 3 | 19.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{3} - 6T_{3} - 3 \)
acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(418))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T + 1)^{3} \)
|
| $3$ |
\( T^{3} - 6T - 3 \)
|
| $5$ |
\( T^{3} + 3 T^{2} + \cdots - 18 \)
|
| $7$ |
\( T^{3} + 6 T^{2} + \cdots - 57 \)
|
| $11$ |
\( (T + 1)^{3} \)
|
| $13$ |
\( T^{3} - 18T - 29 \)
|
| $17$ |
\( T^{3} + 9 T^{2} + \cdots - 4 \)
|
| $19$ |
\( (T + 1)^{3} \)
|
| $23$ |
\( T^{3} + 15 T^{2} + \cdots + 76 \)
|
| $29$ |
\( T^{3} - 6 T^{2} + \cdots + 147 \)
|
| $31$ |
\( T^{3} + 3 T^{2} + \cdots - 134 \)
|
| $37$ |
\( T^{3} + 6 T^{2} + \cdots - 96 \)
|
| $41$ |
\( T^{3} + 9 T^{2} + \cdots - 122 \)
|
| $43$ |
\( T^{3} + 21 T^{2} + \cdots - 184 \)
|
| $47$ |
\( T^{3} + 12 T^{2} + \cdots - 672 \)
|
| $53$ |
\( T^{3} + 9 T^{2} + \cdots - 452 \)
|
| $59$ |
\( T^{3} + 3 T^{2} + \cdots - 64 \)
|
| $61$ |
\( T^{3} - 24 T^{2} + \cdots - 192 \)
|
| $67$ |
\( T^{3} - 96T + 123 \)
|
| $71$ |
\( T^{3} - 21 T^{2} + \cdots + 1306 \)
|
| $73$ |
\( T^{3} + 3 T^{2} + \cdots - 12 \)
|
| $79$ |
\( T^{3} + 6 T^{2} + \cdots - 944 \)
|
| $83$ |
\( T^{3} + 33 T^{2} + \cdots + 1104 \)
|
| $89$ |
\( T^{3} - 6 T^{2} + \cdots + 144 \)
|
| $97$ |
\( T^{3} - 12 T^{2} + \cdots + 256 \)
|
| show more | |
| show less |