Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [507,3,Mod(170,507)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(507, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1, 0]))
N = Newforms(chi, 3, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("507.170");
S:= CuspForms(chi, 3);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 507 = 3 \cdot 13^{2} \) |
| Weight: | \( k \) | \(=\) | \( 3 \) |
| Character orbit: | \([\chi]\) | \(=\) | 507.c (of order \(2\), degree \(1\), 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: | \(13.8147494031\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\sqrt{-3}, \sqrt{-35})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} - 8x^{2} - 9x + 81 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 2^{2} \) |
| Twist minimal: | no (minimal twist has level 39) |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{2}]$ |
$q$-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
\( x^{4} - x^{3} - 8x^{2} - 9x + 81 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( -\nu^{3} - 8\nu^{2} + 8\nu + 45 ) / 36 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -\nu^{3} + 9 ) / 8 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( -\nu^{3} + 16\nu + 9 ) / 8 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{3} - \beta_{2} ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{3} + \beta_{2} - 9\beta _1 + 9 ) / 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( -8\beta_{2} + 9 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/507\mathbb{Z}\right)^\times\).
| \(n\) | \(170\) | \(340\) |
| \(\chi(n)\) | \(-1\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 170.1 |
|
− | 1.73205i | −0.500000 | − | 2.95804i | 1.00000 | − | 5.19615i | −5.12348 | + | 0.866025i | −10.2470 | − | 8.66025i | −8.50000 | + | 2.95804i | −9.00000 | |||||||||||||||||||||
| 170.2 | − | 1.73205i | −0.500000 | + | 2.95804i | 1.00000 | − | 5.19615i | 5.12348 | + | 0.866025i | 10.2470 | − | 8.66025i | −8.50000 | − | 2.95804i | −9.00000 | ||||||||||||||||||||||
| 170.3 | 1.73205i | −0.500000 | − | 2.95804i | 1.00000 | 5.19615i | 5.12348 | − | 0.866025i | 10.2470 | 8.66025i | −8.50000 | + | 2.95804i | −9.00000 | |||||||||||||||||||||||||
| 170.4 | 1.73205i | −0.500000 | + | 2.95804i | 1.00000 | 5.19615i | −5.12348 | − | 0.866025i | −10.2470 | 8.66025i | −8.50000 | − | 2.95804i | −9.00000 | |||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 3.b | odd | 2 | 1 | inner |
| 13.b | even | 2 | 1 | inner |
| 39.d | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 507.3.c.f | 4 | |
| 3.b | odd | 2 | 1 | inner | 507.3.c.f | 4 | |
| 13.b | even | 2 | 1 | inner | 507.3.c.f | 4 | |
| 13.d | odd | 4 | 2 | 39.3.d.c | ✓ | 4 | |
| 39.d | odd | 2 | 1 | inner | 507.3.c.f | 4 | |
| 39.f | even | 4 | 2 | 39.3.d.c | ✓ | 4 | |
| 52.f | even | 4 | 2 | 624.3.l.f | 4 | ||
| 156.l | odd | 4 | 2 | 624.3.l.f | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 39.3.d.c | ✓ | 4 | 13.d | odd | 4 | 2 | |
| 39.3.d.c | ✓ | 4 | 39.f | even | 4 | 2 | |
| 507.3.c.f | 4 | 1.a | even | 1 | 1 | trivial | |
| 507.3.c.f | 4 | 3.b | odd | 2 | 1 | inner | |
| 507.3.c.f | 4 | 13.b | even | 2 | 1 | inner | |
| 507.3.c.f | 4 | 39.d | odd | 2 | 1 | inner | |
| 624.3.l.f | 4 | 52.f | even | 4 | 2 | ||
| 624.3.l.f | 4 | 156.l | odd | 4 | 2 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{3}^{\mathrm{new}}(507, [\chi])\):
|
\( T_{2}^{2} + 3 \)
|
|
\( T_{5}^{2} + 27 \)
|
|
\( T_{7}^{2} - 105 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T^{2} + 3)^{2} \)
|
| $3$ |
\( (T^{2} + T + 9)^{2} \)
|
| $5$ |
\( (T^{2} + 27)^{2} \)
|
| $7$ |
\( (T^{2} - 105)^{2} \)
|
| $11$ |
\( (T^{2} + 12)^{2} \)
|
| $13$ |
\( T^{4} \)
|
| $17$ |
\( (T^{2} + 315)^{2} \)
|
| $19$ |
\( (T^{2} - 420)^{2} \)
|
| $23$ |
\( T^{4} \)
|
| $29$ |
\( (T^{2} + 1260)^{2} \)
|
| $31$ |
\( (T^{2} - 420)^{2} \)
|
| $37$ |
\( (T^{2} - 105)^{2} \)
|
| $41$ |
\( (T^{2} + 12)^{2} \)
|
| $43$ |
\( (T + 35)^{4} \)
|
| $47$ |
\( (T^{2} + 2883)^{2} \)
|
| $53$ |
\( (T^{2} + 5040)^{2} \)
|
| $59$ |
\( (T^{2} + 432)^{2} \)
|
| $61$ |
\( (T - 70)^{4} \)
|
| $67$ |
\( T^{4} \)
|
| $71$ |
\( (T^{2} + 6627)^{2} \)
|
| $73$ |
\( (T^{2} - 15120)^{2} \)
|
| $79$ |
\( (T + 50)^{4} \)
|
| $83$ |
\( (T^{2} + 16428)^{2} \)
|
| $89$ |
\( (T^{2} + 11532)^{2} \)
|
| $97$ |
\( (T^{2} - 420)^{2} \)
|
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