Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [38,8,Mod(1,38)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(38, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0]))
N = Newforms(chi, 8, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("38.1");
S:= CuspForms(chi, 8);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 38 = 2 \cdot 19 \) |
| Weight: | \( k \) | \(=\) | \( 8 \) |
| Character orbit: | \([\chi]\) | \(=\) | 38.a (trivial) |
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: | yes |
| Analytic conductor: | \(11.8706309684\) |
| Analytic rank: | \(1\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{633}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x - 158 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| Fricke sign: | \(-1\) |
| Sato-Tate group: | $\mathrm{SU}(2)$ |
$q$-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 \(\beta = \frac{1}{2}(1 + \sqrt{633})\). We also show the integral \(q\)-expansion of the trace form.
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.1 |
|
8.00000 | −72.2392 | 64.0000 | 467.472 | −577.914 | −1471.23 | 512.000 | 3031.51 | 3739.78 | ||||||||||||||||||||||||
| 1.2 | 8.00000 | 3.23924 | 64.0000 | −312.472 | 25.9139 | −766.767 | 512.000 | −2176.51 | −2499.78 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(19\) | \(1\) |
Inner twists
This newform does not admit any (nontrivial) inner twists.
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 38.8.a.d | ✓ | 2 |
| 3.b | odd | 2 | 1 | 342.8.a.g | 2 | ||
| 4.b | odd | 2 | 1 | 304.8.a.d | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 38.8.a.d | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 304.8.a.d | 2 | 4.b | odd | 2 | 1 | ||
| 342.8.a.g | 2 | 3.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{2} + 69T_{3} - 234 \)
acting on \(S_{8}^{\mathrm{new}}(\Gamma_0(38))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T - 8)^{2} \)
|
| $3$ |
\( T^{2} + 69T - 234 \)
|
| $5$ |
\( T^{2} - 155T - 146072 \)
|
| $7$ |
\( T^{2} + 2238 T + 1128093 \)
|
| $11$ |
\( T^{2} + 3295 T - 894002 \)
|
| $13$ |
\( T^{2} + 13427 T + 13167724 \)
|
| $17$ |
\( T^{2} + 32256 T + 253133559 \)
|
| $19$ |
\( (T + 6859)^{2} \)
|
| $23$ |
\( T^{2} + \cdots - 1087606952 \)
|
| $29$ |
\( T^{2} + \cdots - 1552615514 \)
|
| $31$ |
\( T^{2} + \cdots + 9936311536 \)
|
| $37$ |
\( T^{2} + \cdots - 6156318428 \)
|
| $41$ |
\( T^{2} + \cdots - 393872642768 \)
|
| $43$ |
\( T^{2} + \cdots - 268023173408 \)
|
| $47$ |
\( T^{2} + \cdots + 474895142800 \)
|
| $53$ |
\( T^{2} + \cdots + 79392286228 \)
|
| $59$ |
\( T^{2} + \cdots - 1837525132614 \)
|
| $61$ |
\( T^{2} + \cdots - 359679230318 \)
|
| $67$ |
\( T^{2} + \cdots - 1107042934188 \)
|
| $71$ |
\( T^{2} + \cdots - 10503963815108 \)
|
| $73$ |
\( T^{2} + \cdots - 4520032488687 \)
|
| $79$ |
\( T^{2} + \cdots - 5162668519808 \)
|
| $83$ |
\( T^{2} + \cdots + 23086028557656 \)
|
| $89$ |
\( T^{2} + \cdots - 29977064763600 \)
|
| $97$ |
\( T^{2} + \cdots - 88352296135184 \)
|
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