Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [819,6,Mod(1,819)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(819, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 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("819.1");
S:= CuspForms(chi, 6);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 819 = 3^{2} \cdot 7 \cdot 13 \) |
| Weight: | \( k \) | \(=\) | \( 6 \) |
| Character orbit: | \([\chi]\) | \(=\) | 819.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: | \(131.354348427\) |
| Analytic rank: | \(0\) |
| Dimension: | \(6\) |
| Coefficient field: | \(\mathbb{Q}[x]/(x^{6} - \cdots)\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{6} - x^{5} - 148x^{4} - 156x^{3} + 4763x^{2} + 5973x - 23760 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{11}]\) |
| Coefficient ring index: | \( 2 \) |
| Twist minimal: | no (minimal twist has level 273) |
| 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 \(1,\beta_1,\ldots,\beta_{5}\) 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
\( x^{6} - x^{5} - 148x^{4} - 156x^{3} + 4763x^{2} + 5973x - 23760 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} - 3\nu - 49 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( \nu^{3} - 6\nu^{2} - 69\nu + 156 ) / 2 \)
|
| \(\beta_{4}\) | \(=\) |
\( ( \nu^{5} - 10\nu^{4} - 82\nu^{3} + 654\nu^{2} + 1301\nu - 5616 ) / 48 \)
|
| \(\beta_{5}\) | \(=\) |
\( ( \nu^{5} - 4\nu^{4} - 118\nu^{3} + 120\nu^{2} + 2573\nu + 108 ) / 12 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{2} + 3\beta _1 + 49 \)
|
| \(\nu^{3}\) | \(=\) |
\( 2\beta_{3} + 6\beta_{2} + 87\beta _1 + 138 \)
|
| \(\nu^{4}\) | \(=\) |
\( 2\beta_{5} - 8\beta_{4} + 12\beta_{3} + 125\beta_{2} + 577\beta _1 + 4235 \)
|
| \(\nu^{5}\) | \(=\) |
\( 20\beta_{5} - 32\beta_{4} + 284\beta_{3} + 1088\beta_{2} + 9641\beta _1 + 27236 \)
|
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 |
|
−10.6344 | 0 | 81.0902 | −31.2134 | 0 | −49.0000 | −522.044 | 0 | 331.935 | ||||||||||||||||||||||||||||||||||||
| 1.2 | −4.92390 | 0 | −7.75525 | 48.9095 | 0 | −49.0000 | 195.751 | 0 | −240.825 | |||||||||||||||||||||||||||||||||||||
| 1.3 | −0.801362 | 0 | −31.3578 | −52.9465 | 0 | −49.0000 | 50.7725 | 0 | 42.4293 | |||||||||||||||||||||||||||||||||||||
| 1.4 | 4.45521 | 0 | −12.1511 | −39.9280 | 0 | −49.0000 | −196.702 | 0 | −177.888 | |||||||||||||||||||||||||||||||||||||
| 1.5 | 8.06881 | 0 | 33.1056 | 61.6957 | 0 | −49.0000 | 8.92103 | 0 | 497.810 | |||||||||||||||||||||||||||||||||||||
| 1.6 | 8.83563 | 0 | 46.0683 | −98.5172 | 0 | −49.0000 | 124.302 | 0 | −870.462 | |||||||||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(3\) | \(-1\) |
| \(7\) | \(1\) |
| \(13\) | \(1\) |
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 | 819.6.a.c | 6 | |
| 3.b | odd | 2 | 1 | 273.6.a.d | ✓ | 6 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 273.6.a.d | ✓ | 6 | 3.b | odd | 2 | 1 | |
| 819.6.a.c | 6 | 1.a | even | 1 | 1 | trivial | |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{6} - 5T_{2}^{5} - 138T_{2}^{4} + 738T_{2}^{3} + 3412T_{2}^{2} - 14440T_{2} - 13328 \)
acting on \(S_{6}^{\mathrm{new}}(\Gamma_0(819))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{6} - 5 T^{5} + \cdots - 13328 \)
|
| $3$ |
\( T^{6} \)
|
| $5$ |
\( T^{6} + \cdots + 19616265936 \)
|
| $7$ |
\( (T + 49)^{6} \)
|
| $11$ |
\( T^{6} + \cdots + 2920455601776 \)
|
| $13$ |
\( (T + 169)^{6} \)
|
| $17$ |
\( T^{6} + \cdots - 45\!\cdots\!88 \)
|
| $19$ |
\( T^{6} + \cdots - 76\!\cdots\!32 \)
|
| $23$ |
\( T^{6} + \cdots + 89\!\cdots\!20 \)
|
| $29$ |
\( T^{6} + \cdots - 25\!\cdots\!04 \)
|
| $31$ |
\( T^{6} + \cdots - 19\!\cdots\!40 \)
|
| $37$ |
\( T^{6} + \cdots + 14\!\cdots\!72 \)
|
| $41$ |
\( T^{6} + \cdots + 12\!\cdots\!16 \)
|
| $43$ |
\( T^{6} + \cdots + 58\!\cdots\!72 \)
|
| $47$ |
\( T^{6} + \cdots + 10\!\cdots\!00 \)
|
| $53$ |
\( T^{6} + \cdots - 16\!\cdots\!68 \)
|
| $59$ |
\( T^{6} + \cdots - 59\!\cdots\!80 \)
|
| $61$ |
\( T^{6} + \cdots - 28\!\cdots\!00 \)
|
| $67$ |
\( T^{6} + \cdots + 10\!\cdots\!96 \)
|
| $71$ |
\( T^{6} + \cdots - 39\!\cdots\!40 \)
|
| $73$ |
\( T^{6} + \cdots + 76\!\cdots\!00 \)
|
| $79$ |
\( T^{6} + \cdots - 14\!\cdots\!60 \)
|
| $83$ |
\( T^{6} + \cdots + 22\!\cdots\!36 \)
|
| $89$ |
\( T^{6} + \cdots - 13\!\cdots\!36 \)
|
| $97$ |
\( T^{6} + \cdots + 12\!\cdots\!68 \)
|
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