Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1620,4,Mod(541,1620)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1620, base_ring=CyclotomicField(6))
chi = DirichletCharacter(H, H._module([0, 4, 0]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("1620.541");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1620 = 2^{2} \cdot 3^{4} \cdot 5 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1620.i (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: | \(95.5830942093\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{-3}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x + 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 540) |
| 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 primitive root of unity \(\zeta_{6}\). We also show the integral \(q\)-expansion of the trace form.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/1620\mathbb{Z}\right)^\times\).
| \(n\) | \(811\) | \(1297\) | \(1541\) |
| \(\chi(n)\) | \(1\) | \(1\) | \(-\zeta_{6}\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 541.1 |
|
0 | 0 | 0 | 2.50000 | + | 4.33013i | 0 | −8.50000 | + | 14.7224i | 0 | 0 | 0 | ||||||||||||||||||||
| 1081.1 | 0 | 0 | 0 | 2.50000 | − | 4.33013i | 0 | −8.50000 | − | 14.7224i | 0 | 0 | 0 | |||||||||||||||||||||
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 | 1620.4.i.h | 2 | |
| 3.b | odd | 2 | 1 | 1620.4.i.b | 2 | ||
| 9.c | even | 3 | 1 | 540.4.a.b | ✓ | 1 | |
| 9.c | even | 3 | 1 | inner | 1620.4.i.h | 2 | |
| 9.d | odd | 6 | 1 | 540.4.a.d | yes | 1 | |
| 9.d | odd | 6 | 1 | 1620.4.i.b | 2 | ||
| 36.f | odd | 6 | 1 | 2160.4.a.a | 1 | ||
| 36.h | even | 6 | 1 | 2160.4.a.k | 1 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 540.4.a.b | ✓ | 1 | 9.c | even | 3 | 1 | |
| 540.4.a.d | yes | 1 | 9.d | odd | 6 | 1 | |
| 1620.4.i.b | 2 | 3.b | odd | 2 | 1 | ||
| 1620.4.i.b | 2 | 9.d | odd | 6 | 1 | ||
| 1620.4.i.h | 2 | 1.a | even | 1 | 1 | trivial | |
| 1620.4.i.h | 2 | 9.c | even | 3 | 1 | inner | |
| 2160.4.a.a | 1 | 36.f | odd | 6 | 1 | ||
| 2160.4.a.k | 1 | 36.h | even | 6 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(1620, [\chi])\):
|
\( T_{7}^{2} + 17T_{7} + 289 \)
|
|
\( T_{11}^{2} + 30T_{11} + 900 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} \)
|
| $3$ |
\( T^{2} \)
|
| $5$ |
\( T^{2} - 5T + 25 \)
|
| $7$ |
\( T^{2} + 17T + 289 \)
|
| $11$ |
\( T^{2} + 30T + 900 \)
|
| $13$ |
\( T^{2} - 61T + 3721 \)
|
| $17$ |
\( (T - 120)^{2} \)
|
| $19$ |
\( (T + 43)^{2} \)
|
| $23$ |
\( T^{2} - 90T + 8100 \)
|
| $29$ |
\( T^{2} + 90T + 8100 \)
|
| $31$ |
\( T^{2} + 8T + 64 \)
|
| $37$ |
\( (T - 317)^{2} \)
|
| $41$ |
\( T^{2} + 30T + 900 \)
|
| $43$ |
\( T^{2} - 220T + 48400 \)
|
| $47$ |
\( T^{2} + 180T + 32400 \)
|
| $53$ |
\( (T - 630)^{2} \)
|
| $59$ |
\( T^{2} + 840T + 705600 \)
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| $61$ |
\( T^{2} + 599T + 358801 \)
|
| $67$ |
\( T^{2} + 107T + 11449 \)
|
| $71$ |
\( (T - 210)^{2} \)
|
| $73$ |
\( (T + 421)^{2} \)
|
| $79$ |
\( T^{2} + 353T + 124609 \)
|
| $83$ |
\( T^{2} + 1350 T + 1822500 \)
|
| $89$ |
\( (T + 1020)^{2} \)
|
| $97$ |
\( T^{2} - 997T + 994009 \)
|
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