Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [171,3,Mod(26,171)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(171, base_ring=CyclotomicField(6))
chi = DirichletCharacter(H, H._module([3, 2]))
N = Newforms(chi, 3, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("171.26");
S:= CuspForms(chi, 3);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 171 = 3^{2} \cdot 19 \) |
| Weight: | \( k \) | \(=\) | \( 3 \) |
| Character orbit: | \([\chi]\) | \(=\) | 171.r (of order \(6\), degree \(2\), 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: | \(4.65941252056\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Relative dimension: | \(2\) over \(\Q(\zeta_{6})\) |
| Coefficient field: | \(\Q(\sqrt{-2}, \sqrt{-3})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - 2x^{2} + 4 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 3^{2} \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{6}]$ |
$q$-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
\( x^{4} - 2x^{2} + 4 \)
:
| \(\beta_{1}\) | \(=\) |
\( 3\nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( \nu^{2} ) / 2 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( 3\nu^{3} ) / 2 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_1 ) / 3 \)
|
| \(\nu^{2}\) | \(=\) |
\( 2\beta_{2} \)
|
| \(\nu^{3}\) | \(=\) |
\( ( 2\beta_{3} ) / 3 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/171\mathbb{Z}\right)^\times\).
| \(n\) | \(20\) | \(154\) |
| \(\chi(n)\) | \(-1\) | \(-1 + \beta_{2}\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 26.1 |
|
1.50000 | − | 0.866025i | 0 | −0.500000 | + | 0.866025i | −6.67423 | + | 3.85337i | 0 | −2.34847 | 8.66025i | 0 | −6.67423 | + | 11.5601i | ||||||||||||||||||||||
| 26.2 | 1.50000 | − | 0.866025i | 0 | −0.500000 | + | 0.866025i | 0.674235 | − | 0.389270i | 0 | 12.3485 | 8.66025i | 0 | 0.674235 | − | 1.16781i | |||||||||||||||||||||||
| 125.1 | 1.50000 | + | 0.866025i | 0 | −0.500000 | − | 0.866025i | −6.67423 | − | 3.85337i | 0 | −2.34847 | − | 8.66025i | 0 | −6.67423 | − | 11.5601i | ||||||||||||||||||||||
| 125.2 | 1.50000 | + | 0.866025i | 0 | −0.500000 | − | 0.866025i | 0.674235 | + | 0.389270i | 0 | 12.3485 | − | 8.66025i | 0 | 0.674235 | + | 1.16781i | ||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 57.h | odd | 6 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 171.3.r.b | yes | 4 |
| 3.b | odd | 2 | 1 | 171.3.r.a | ✓ | 4 | |
| 19.c | even | 3 | 1 | 171.3.r.a | ✓ | 4 | |
| 57.h | odd | 6 | 1 | inner | 171.3.r.b | yes | 4 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 171.3.r.a | ✓ | 4 | 3.b | odd | 2 | 1 | |
| 171.3.r.a | ✓ | 4 | 19.c | even | 3 | 1 | |
| 171.3.r.b | yes | 4 | 1.a | even | 1 | 1 | trivial |
| 171.3.r.b | yes | 4 | 57.h | odd | 6 | 1 | inner |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{2} - 3T_{2} + 3 \)
acting on \(S_{3}^{\mathrm{new}}(171, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T^{2} - 3 T + 3)^{2} \)
|
| $3$ |
\( T^{4} \)
|
| $5$ |
\( T^{4} + 12 T^{3} + \cdots + 36 \)
|
| $7$ |
\( (T^{2} - 10 T - 29)^{2} \)
|
| $11$ |
\( (T^{2} + 72)^{2} \)
|
| $13$ |
\( T^{4} + 10 T^{3} + \cdots + 841 \)
|
| $17$ |
\( T^{4} - 24 T^{3} + \cdots + 161604 \)
|
| $19$ |
\( (T - 19)^{4} \)
|
| $23$ |
\( (T^{2} + 60 T + 1200)^{2} \)
|
| $29$ |
\( T^{4} - 60 T^{3} + \cdots + 22500 \)
|
| $31$ |
\( (T^{2} + 2 T - 1349)^{2} \)
|
| $37$ |
\( (T^{2} + 50 T + 571)^{2} \)
|
| $41$ |
\( T^{4} + 120 T^{3} + \cdots + 1272384 \)
|
| $43$ |
\( T^{4} - 50 T^{3} + \cdots + 57121 \)
|
| $47$ |
\( T^{4} - 60 T^{3} + \cdots + 22500 \)
|
| $53$ |
\( T^{4} - 24 T^{3} + \cdots + 3069504 \)
|
| $59$ |
\( T^{4} + 120 T^{3} + \cdots + 562500 \)
|
| $61$ |
\( T^{4} - 122 T^{3} + \cdots + 5621641 \)
|
| $67$ |
\( T^{4} + 10 T^{3} + \cdots + 111492481 \)
|
| $71$ |
\( T^{4} - 240 T^{3} + \cdots + 22353984 \)
|
| $73$ |
\( T^{4} + 70 T^{3} + \cdots + 516961 \)
|
| $79$ |
\( T^{4} - 122 T^{3} + \cdots + 5621641 \)
|
| $83$ |
\( (T^{2} + 450)^{2} \)
|
| $89$ |
\( T^{4} - 240 T^{3} + \cdots + 3090564 \)
|
| $97$ |
\( (T^{2} + 20 T + 400)^{2} \)
|
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