Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [810,4,Mod(271,810)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(810, base_ring=CyclotomicField(6))
chi = DirichletCharacter(H, H._module([2, 0]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("810.271");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 810 = 2 \cdot 3^{4} \cdot 5 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 810.e (of order \(3\), degree \(2\), not 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: | \(47.7915471046\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Relative dimension: | \(2\) over \(\Q(\zeta_{3})\) |
| Coefficient field: | \(\Q(\sqrt{-3}, \sqrt{-163})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} - 40x^{2} - 41x + 1681 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 3 \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{3}]$ |
$q$-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
\( x^{4} - x^{3} - 40x^{2} - 41x + 1681 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( \nu^{3} + 40\nu^{2} - 40\nu - 1681 ) / 1640 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -\nu^{3} + \nu^{2} + 81\nu ) / 41 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( \nu^{3} + 40\nu - 81 ) / 40 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{3} + \beta_{2} - \beta _1 + 1 ) / 3 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( -\beta_{3} + 2\beta_{2} + 121\beta _1 + 122 ) / 3 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( 80\beta_{3} - 40\beta_{2} + 40\beta _1 + 203 ) / 3 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/810\mathbb{Z}\right)^\times\).
| \(n\) | \(487\) | \(731\) |
| \(\chi(n)\) | \(1\) | \(\beta_{1}\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 271.1 |
|
1.00000 | + | 1.73205i | 0 | −2.00000 | + | 3.46410i | 2.50000 | − | 4.33013i | 0 | −7.27834 | − | 12.6064i | −8.00000 | 0 | 10.0000 | ||||||||||||||||||||||
| 271.2 | 1.00000 | + | 1.73205i | 0 | −2.00000 | + | 3.46410i | 2.50000 | − | 4.33013i | 0 | 3.77834 | + | 6.54427i | −8.00000 | 0 | 10.0000 | |||||||||||||||||||||||
| 541.1 | 1.00000 | − | 1.73205i | 0 | −2.00000 | − | 3.46410i | 2.50000 | + | 4.33013i | 0 | −7.27834 | + | 12.6064i | −8.00000 | 0 | 10.0000 | |||||||||||||||||||||||
| 541.2 | 1.00000 | − | 1.73205i | 0 | −2.00000 | − | 3.46410i | 2.50000 | + | 4.33013i | 0 | 3.77834 | − | 6.54427i | −8.00000 | 0 | 10.0000 | |||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 9.c | even | 3 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 810.4.e.bc | 4 | |
| 3.b | odd | 2 | 1 | 810.4.e.y | 4 | ||
| 9.c | even | 3 | 1 | 810.4.a.j | ✓ | 2 | |
| 9.c | even | 3 | 1 | inner | 810.4.e.bc | 4 | |
| 9.d | odd | 6 | 1 | 810.4.a.p | yes | 2 | |
| 9.d | odd | 6 | 1 | 810.4.e.y | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 810.4.a.j | ✓ | 2 | 9.c | even | 3 | 1 | |
| 810.4.a.p | yes | 2 | 9.d | odd | 6 | 1 | |
| 810.4.e.y | 4 | 3.b | odd | 2 | 1 | ||
| 810.4.e.y | 4 | 9.d | odd | 6 | 1 | ||
| 810.4.e.bc | 4 | 1.a | even | 1 | 1 | trivial | |
| 810.4.e.bc | 4 | 9.c | even | 3 | 1 | inner | |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(810, [\chi])\):
|
\( T_{7}^{4} + 7T_{7}^{3} + 159T_{7}^{2} - 770T_{7} + 12100 \)
|
|
\( T_{11}^{4} + 15T_{11}^{3} + 3225T_{11}^{2} - 45000T_{11} + 9000000 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T^{2} - 2 T + 4)^{2} \)
|
| $3$ |
\( T^{4} \)
|
| $5$ |
\( (T^{2} - 5 T + 25)^{2} \)
|
| $7$ |
\( T^{4} + 7 T^{3} + \cdots + 12100 \)
|
| $11$ |
\( T^{4} + 15 T^{3} + \cdots + 9000000 \)
|
| $13$ |
\( T^{4} + 49 T^{3} + \cdots + 6031936 \)
|
| $17$ |
\( (T^{2} + 24 T - 1812)^{2} \)
|
| $19$ |
\( (T^{2} - 64 T + 535)^{2} \)
|
| $23$ |
\( T^{4} - 147 T^{3} + \cdots + 88172100 \)
|
| $29$ |
\( T^{4} + \cdots + 4029710400 \)
|
| $31$ |
\( T^{4} - 143 T^{3} + \cdots + 4227136 \)
|
| $37$ |
\( (T^{2} - 358 T + 27640)^{2} \)
|
| $41$ |
\( T^{4} - 432 T^{3} + \cdots + 49660209 \)
|
| $43$ |
\( T^{4} + \cdots + 2469692416 \)
|
| $47$ |
\( T^{4} + \cdots + 8128104336 \)
|
| $53$ |
\( (T^{2} - 231 T - 280182)^{2} \)
|
| $59$ |
\( T^{4} + \cdots + 19015031025 \)
|
| $61$ |
\( T^{4} + \cdots + 14687500864 \)
|
| $67$ |
\( T^{4} + \cdots + 9883541056 \)
|
| $71$ |
\( (T^{2} - 1329 T + 255618)^{2} \)
|
| $73$ |
\( (T^{2} - 244 T - 55532)^{2} \)
|
| $79$ |
\( T^{4} + \cdots + 34852409344 \)
|
| $83$ |
\( T^{4} + \cdots + 15593016384 \)
|
| $89$ |
\( (T^{2} - 2517 T + 1582722)^{2} \)
|
| $97$ |
\( T^{4} + \cdots + 277636255744 \)
|
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