Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [930,2,Mod(481,930)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(930, base_ring=CyclotomicField(10))
chi = DirichletCharacter(H, H._module([0, 0, 2]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("930.481");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 930 = 2 \cdot 3 \cdot 5 \cdot 31 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 930.n (of order \(5\), degree \(4\), minimal) |
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: | no |
| Analytic conductor: | \(7.42608738798\) |
| Analytic rank: | \(0\) |
| Dimension: | \(8\) |
| Relative dimension: | \(2\) over \(\Q(\zeta_{5})\) |
| Coefficient field: | 8.0.13140625.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{8} - 3x^{7} + 5x^{6} - 3x^{5} + 4x^{4} + 3x^{3} + 5x^{2} + 3x + 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{5}]$ |
$q$-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 \(1,\beta_1,\ldots,\beta_{7}\) 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
\( x^{8} - 3x^{7} + 5x^{6} - 3x^{5} + 4x^{4} + 3x^{3} + 5x^{2} + 3x + 1 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -\nu^{7} + 2\nu^{6} - 3\nu^{5} - 4\nu^{3} - 7\nu^{2} - 12\nu - 7 ) / 8 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( \nu^{7} - 7\nu^{5} + 20\nu^{4} - 16\nu^{3} + 19\nu^{2} + 6\nu + 9 ) / 8 \)
|
| \(\beta_{4}\) | \(=\) |
\( ( -\nu^{7} + 4\nu^{6} - 9\nu^{5} + 12\nu^{4} - 16\nu^{3} + 13\nu^{2} - 10\nu - 1 ) / 8 \)
|
| \(\beta_{5}\) | \(=\) |
\( ( -3\nu^{7} + 10\nu^{6} - 17\nu^{5} + 8\nu^{4} - 4\nu^{3} - 13\nu^{2} - 8\nu - 5 ) / 8 \)
|
| \(\beta_{6}\) | \(=\) |
\( ( 3\nu^{7} - 12\nu^{6} + 23\nu^{5} - 20\nu^{4} + 16\nu^{3} + \nu^{2} + 6\nu - 1 ) / 8 \)
|
| \(\beta_{7}\) | \(=\) |
\( ( -5\nu^{7} + 18\nu^{6} - 35\nu^{5} + 32\nu^{4} - 28\nu^{3} - 11\nu^{2} - 12\nu - 7 ) / 8 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{6} + \beta_{5} + \beta_{4} - \beta_{2} \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{7} + 3\beta_{6} + 2\beta_{5} + \beta_{4} - 3\beta_{2} - 2\beta_1 \)
|
| \(\nu^{4}\) | \(=\) |
\( 3\beta_{7} + 4\beta_{6} + \beta_{4} - \beta_{3} - 5\beta_{2} - 4\beta_1 \)
|
| \(\nu^{5}\) | \(=\) |
\( 4\beta_{7} - 6\beta_{5} - 4\beta_{3} - 6\beta_{2} - 6\beta _1 - 1 \)
|
| \(\nu^{6}\) | \(=\) |
\( -16\beta_{6} - 16\beta_{5} - 6\beta_{4} - 6\beta_{3} - 7\beta _1 - 6 \)
|
| \(\nu^{7}\) | \(=\) |
\( -16\beta_{7} - 51\beta_{6} - 29\beta_{5} - 23\beta_{4} + 29\beta_{2} - 16 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/930\mathbb{Z}\right)^\times\).
| \(n\) | \(187\) | \(311\) | \(871\) |
| \(\chi(n)\) | \(1\) | \(1\) | \(-1 + \beta_{3} - \beta_{4} - \beta_{7}\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 481.1 |
|
−0.809017 | + | 0.587785i | 0.809017 | + | 0.587785i | 0.309017 | − | 0.951057i | 1.00000 | −1.00000 | −0.518200 | + | 1.59485i | 0.309017 | + | 0.951057i | 0.309017 | + | 0.951057i | −0.809017 | + | 0.587785i | ||||||||||||||||||||||||||||
| 481.2 | −0.809017 | + | 0.587785i | 0.809017 | + | 0.587785i | 0.309017 | − | 0.951057i | 1.00000 | −1.00000 | −0.0268854 | + | 0.0827449i | 0.309017 | + | 0.951057i | 0.309017 | + | 0.951057i | −0.809017 | + | 0.587785i | |||||||||||||||||||||||||||||
| 721.1 | 0.309017 | − | 0.951057i | −0.309017 | − | 0.951057i | −0.809017 | − | 0.587785i | 1.00000 | −1.00000 | 1.15245 | + | 0.837304i | −0.809017 | + | 0.587785i | −0.809017 | + | 0.587785i | 0.309017 | − | 0.951057i | |||||||||||||||||||||||||||||
| 721.2 | 0.309017 | − | 0.951057i | −0.309017 | − | 0.951057i | −0.809017 | − | 0.587785i | 1.00000 | −1.00000 | 3.89263 | + | 2.82816i | −0.809017 | + | 0.587785i | −0.809017 | + | 0.587785i | 0.309017 | − | 0.951057i | |||||||||||||||||||||||||||||
| 841.1 | 0.309017 | + | 0.951057i | −0.309017 | + | 0.951057i | −0.809017 | + | 0.587785i | 1.00000 | −1.00000 | 1.15245 | − | 0.837304i | −0.809017 | − | 0.587785i | −0.809017 | − | 0.587785i | 0.309017 | + | 0.951057i | |||||||||||||||||||||||||||||
| 841.2 | 0.309017 | + | 0.951057i | −0.309017 | + | 0.951057i | −0.809017 | + | 0.587785i | 1.00000 | −1.00000 | 3.89263 | − | 2.82816i | −0.809017 | − | 0.587785i | −0.809017 | − | 0.587785i | 0.309017 | + | 0.951057i | |||||||||||||||||||||||||||||
| 901.1 | −0.809017 | − | 0.587785i | 0.809017 | − | 0.587785i | 0.309017 | + | 0.951057i | 1.00000 | −1.00000 | −0.518200 | − | 1.59485i | 0.309017 | − | 0.951057i | 0.309017 | − | 0.951057i | −0.809017 | − | 0.587785i | |||||||||||||||||||||||||||||
| 901.2 | −0.809017 | − | 0.587785i | 0.809017 | − | 0.587785i | 0.309017 | + | 0.951057i | 1.00000 | −1.00000 | −0.0268854 | − | 0.0827449i | 0.309017 | − | 0.951057i | 0.309017 | − | 0.951057i | −0.809017 | − | 0.587785i | |||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 31.d | even | 5 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 930.2.n.a | ✓ | 8 |
| 31.d | even | 5 | 1 | inner | 930.2.n.a | ✓ | 8 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 930.2.n.a | ✓ | 8 | 1.a | even | 1 | 1 | trivial |
| 930.2.n.a | ✓ | 8 | 31.d | even | 5 | 1 | inner |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{7}^{8} - 9T_{7}^{7} + 35T_{7}^{6} - 51T_{7}^{5} + 94T_{7}^{4} - 141T_{7}^{3} + 125T_{7}^{2} + 6T_{7} + 1 \)
acting on \(S_{2}^{\mathrm{new}}(930, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T^{4} + T^{3} + T^{2} + \cdots + 1)^{2} \)
|
| $3$ |
\( (T^{4} - T^{3} + T^{2} + \cdots + 1)^{2} \)
|
| $5$ |
\( (T - 1)^{8} \)
|
| $7$ |
\( T^{8} - 9 T^{7} + \cdots + 1 \)
|
| $11$ |
\( T^{8} + T^{7} + \cdots + 410881 \)
|
| $13$ |
\( T^{8} - T^{7} + \cdots + 121 \)
|
| $17$ |
\( T^{8} - 13 T^{7} + \cdots + 121 \)
|
| $19$ |
\( T^{8} + 2 T^{7} + \cdots + 7921 \)
|
| $23$ |
\( T^{8} - 8 T^{7} + \cdots + 1681 \)
|
| $29$ |
\( T^{8} + T^{7} + \cdots + 323761 \)
|
| $31$ |
\( T^{8} - 3 T^{7} + \cdots + 923521 \)
|
| $37$ |
\( (T^{4} - 4 T^{3} + \cdots - 139)^{2} \)
|
| $41$ |
\( T^{8} - 29 T^{7} + \cdots + 346921 \)
|
| $43$ |
\( T^{8} + 25 T^{7} + \cdots + 225625 \)
|
| $47$ |
\( T^{8} - 13 T^{7} + \cdots + 346921 \)
|
| $53$ |
\( T^{8} + 19 T^{7} + \cdots + 361 \)
|
| $59$ |
\( T^{8} - 23 T^{7} + \cdots + 6974881 \)
|
| $61$ |
\( (T^{2} + 3 T - 9)^{4} \)
|
| $67$ |
\( (T^{4} + 12 T^{3} + \cdots - 8209)^{2} \)
|
| $71$ |
\( T^{8} - 3 T^{7} + \cdots + 244328161 \)
|
| $73$ |
\( T^{8} + 14 T^{7} + \cdots + 144264121 \)
|
| $79$ |
\( T^{8} + 34 T^{7} + \cdots + 17147881 \)
|
| $83$ |
\( T^{8} - 8 T^{7} + \cdots + 1907161 \)
|
| $89$ |
\( T^{8} - 25 T^{7} + \cdots + 25391521 \)
|
| $97$ |
\( T^{8} + 28 T^{7} + \cdots + 214300321 \)
|
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