Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [378,10,Mod(1,378)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(378, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0]))
N = Newforms(chi, 10, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("378.1");
S:= CuspForms(chi, 10);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 378 = 2 \cdot 3^{3} \cdot 7 \) |
| Weight: | \( k \) | \(=\) | \( 10 \) |
| Character orbit: | \([\chi]\) | \(=\) | 378.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: | \(194.683546070\) |
| 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: |
\( x^{4} - 4538x^{2} - 16x + 4333377 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{13}]\) |
| Coefficient ring index: | \( 2^{4}\cdot 3^{6}\cdot 7 \) |
| 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
\( x^{4} - 4538x^{2} - 16x + 4333377 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( 63\nu^{3} + 1266\nu^{2} - 169941\nu - 2873310 ) / 2602 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -18\nu^{3} + 1311\nu^{2} + 145572\nu - 2974443 ) / 1301 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( -117\nu^{3} + 6570\nu^{2} + 177327\nu - 14905926 ) / 2602 \)
|
| \(\nu\) | \(=\) |
\( ( -3\beta_{3} + 8\beta_{2} - \beta_1 ) / 756 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( 87\beta_{3} + 62\beta_{2} + 197\beta _1 + 857682 ) / 378 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( -11589\beta_{3} + 19088\beta_{2} + 20609\beta _1 + 9072 ) / 756 \)
|
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 |
|
−16.0000 | 0 | 256.000 | −534.657 | 0 | 2401.00 | −4096.00 | 0 | 8554.52 | ||||||||||||||||||||||||||||||
| 1.2 | −16.0000 | 0 | 256.000 | −199.866 | 0 | 2401.00 | −4096.00 | 0 | 3197.85 | |||||||||||||||||||||||||||||||
| 1.3 | −16.0000 | 0 | 256.000 | 759.298 | 0 | 2401.00 | −4096.00 | 0 | −12148.8 | |||||||||||||||||||||||||||||||
| 1.4 | −16.0000 | 0 | 256.000 | 2183.23 | 0 | 2401.00 | −4096.00 | 0 | −34931.6 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(1\) |
| \(3\) | \(1\) |
| \(7\) | \(-1\) |
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 | 378.10.a.d | ✓ | 4 |
| 3.b | odd | 2 | 1 | 378.10.a.e | yes | 4 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 378.10.a.d | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 378.10.a.e | yes | 4 | 3.b | odd | 2 | 1 | |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{5}^{4} - 2208T_{5}^{3} - 396774T_{5}^{2} + 903195360T_{5} + 177143373225 \)
acting on \(S_{10}^{\mathrm{new}}(\Gamma_0(378))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T + 16)^{4} \)
|
| $3$ |
\( T^{4} \)
|
| $5$ |
\( T^{4} + \cdots + 177143373225 \)
|
| $7$ |
\( (T - 2401)^{4} \)
|
| $11$ |
\( T^{4} + \cdots + 38\!\cdots\!89 \)
|
| $13$ |
\( T^{4} + \cdots - 19\!\cdots\!92 \)
|
| $17$ |
\( T^{4} + \cdots + 21\!\cdots\!32 \)
|
| $19$ |
\( T^{4} + \cdots + 49\!\cdots\!57 \)
|
| $23$ |
\( T^{4} + \cdots + 82\!\cdots\!53 \)
|
| $29$ |
\( T^{4} + \cdots + 22\!\cdots\!08 \)
|
| $31$ |
\( T^{4} + \cdots - 15\!\cdots\!23 \)
|
| $37$ |
\( T^{4} + \cdots + 13\!\cdots\!69 \)
|
| $41$ |
\( T^{4} + \cdots - 15\!\cdots\!47 \)
|
| $43$ |
\( T^{4} + \cdots - 17\!\cdots\!24 \)
|
| $47$ |
\( T^{4} + \cdots - 18\!\cdots\!84 \)
|
| $53$ |
\( T^{4} + \cdots - 10\!\cdots\!92 \)
|
| $59$ |
\( T^{4} + \cdots - 75\!\cdots\!32 \)
|
| $61$ |
\( T^{4} + \cdots + 12\!\cdots\!12 \)
|
| $67$ |
\( T^{4} + \cdots + 20\!\cdots\!48 \)
|
| $71$ |
\( T^{4} + \cdots - 81\!\cdots\!91 \)
|
| $73$ |
\( T^{4} + \cdots - 10\!\cdots\!36 \)
|
| $79$ |
\( T^{4} + \cdots + 57\!\cdots\!48 \)
|
| $83$ |
\( T^{4} + \cdots + 14\!\cdots\!00 \)
|
| $89$ |
\( T^{4} + \cdots - 14\!\cdots\!23 \)
|
| $97$ |
\( T^{4} + \cdots + 25\!\cdots\!16 \)
|
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