Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [68,6,Mod(1,68)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(68, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0]))
N = Newforms(chi, 6, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("68.1");
S:= CuspForms(chi, 6);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 68 = 2^{2} \cdot 17 \) |
| Weight: | \( k \) | \(=\) | \( 6 \) |
| Character orbit: | \([\chi]\) | \(=\) | 68.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: | \(10.9060997473\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\mathbb{Q}[x]/(x^{4} - \cdots)\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} - 197x^{2} + 825x + 252 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 2^{3} \) |
| 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 \(1,\beta_1,\beta_2,\beta_3\) 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
\( x^{4} - x^{3} - 197x^{2} + 825x + 252 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( \nu^{3} + 5\nu^{2} - 176\nu + 21 ) / 9 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( \nu^{3} - 4\nu^{2} - 113\nu + 912 ) / 36 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( -\nu^{3} + 4\nu^{2} + 257\nu - 948 ) / 36 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{3} + \beta_{2} + 1 ) / 4 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( 7\beta_{3} - 9\beta_{2} + 4\beta _1 + 403 ) / 4 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( 141\beta_{3} + 221\beta_{2} + 16\beta _1 - 1923 ) / 4 \)
|
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 |
|
0 | −25.9681 | 0 | −41.4460 | 0 | −156.951 | 0 | 431.342 | 0 | ||||||||||||||||||||||||||||||
| 1.2 | 0 | −6.25175 | 0 | −108.008 | 0 | 197.115 | 0 | −203.916 | 0 | |||||||||||||||||||||||||||||||
| 1.3 | 0 | 11.8548 | 0 | 73.3422 | 0 | 76.0881 | 0 | −102.464 | 0 | |||||||||||||||||||||||||||||||
| 1.4 | 0 | 30.3651 | 0 | −11.8878 | 0 | 49.7477 | 0 | 679.037 | 0 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(17\) | \(1\) |
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 | 68.6.a.b | ✓ | 4 |
| 3.b | odd | 2 | 1 | 612.6.a.f | 4 | ||
| 4.b | odd | 2 | 1 | 272.6.a.l | 4 | ||
| 8.b | even | 2 | 1 | 1088.6.a.v | 4 | ||
| 8.d | odd | 2 | 1 | 1088.6.a.z | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 68.6.a.b | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 272.6.a.l | 4 | 4.b | odd | 2 | 1 | ||
| 612.6.a.f | 4 | 3.b | odd | 2 | 1 | ||
| 1088.6.a.v | 4 | 8.b | even | 2 | 1 | ||
| 1088.6.a.z | 4 | 8.d | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{4} - 10T_{3}^{3} - 838T_{3}^{2} + 4744T_{3} + 58440 \)
acting on \(S_{6}^{\mathrm{new}}(\Gamma_0(68))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} - 10 T^{3} + \cdots + 58440 \)
|
| $5$ |
\( T^{4} + 88 T^{3} + \cdots - 3902976 \)
|
| $7$ |
\( T^{4} - 166 T^{3} + \cdots - 117104224 \)
|
| $11$ |
\( T^{4} + \cdots + 23118666408 \)
|
| $13$ |
\( T^{4} + \cdots - 350801230368 \)
|
| $17$ |
\( (T + 289)^{4} \)
|
| $19$ |
\( T^{4} + \cdots + 392558929280 \)
|
| $23$ |
\( T^{4} + \cdots - 7114319354880 \)
|
| $29$ |
\( T^{4} + \cdots + 381908340306432 \)
|
| $31$ |
\( T^{4} + \cdots - 41081773331424 \)
|
| $37$ |
\( T^{4} + \cdots - 10\!\cdots\!68 \)
|
| $41$ |
\( T^{4} + \cdots - 38\!\cdots\!32 \)
|
| $43$ |
\( T^{4} + \cdots - 39\!\cdots\!52 \)
|
| $47$ |
\( T^{4} + \cdots + 88\!\cdots\!00 \)
|
| $53$ |
\( T^{4} + \cdots + 24\!\cdots\!12 \)
|
| $59$ |
\( T^{4} + \cdots - 38\!\cdots\!00 \)
|
| $61$ |
\( T^{4} + \cdots - 20\!\cdots\!20 \)
|
| $67$ |
\( T^{4} + \cdots + 29\!\cdots\!96 \)
|
| $71$ |
\( T^{4} + \cdots - 14\!\cdots\!84 \)
|
| $73$ |
\( T^{4} + \cdots + 12\!\cdots\!68 \)
|
| $79$ |
\( T^{4} + \cdots + 51\!\cdots\!24 \)
|
| $83$ |
\( T^{4} + \cdots + 36\!\cdots\!24 \)
|
| $89$ |
\( T^{4} + \cdots + 15\!\cdots\!72 \)
|
| $97$ |
\( T^{4} + \cdots + 18\!\cdots\!48 \)
|
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