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: | \(\Q(\sqrt{17953}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x - 4488 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| 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 \(\beta = \frac{1}{2}(1 + \sqrt{17953})\). 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 | −72.4944 | 64.0000 | 166.483 | 579.955 | 763.922 | −512.000 | 3068.44 | −1331.87 | ||||||||||||||||||||||||
| 1.2 | −8.00000 | 61.4944 | 64.0000 | −235.483 | −491.955 | −1111.92 | −512.000 | 1594.56 | 1883.87 | |||||||||||||||||||||||||
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.c | ✓ | 2 |
| 3.b | odd | 2 | 1 | 342.8.a.i | 2 | ||
| 4.b | odd | 2 | 1 | 304.8.a.b | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 38.8.a.c | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 304.8.a.b | 2 | 4.b | odd | 2 | 1 | ||
| 342.8.a.i | 2 | 3.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{2} + 11T_{3} - 4458 \)
acting on \(S_{8}^{\mathrm{new}}(\Gamma_0(38))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T + 8)^{2} \)
|
| $3$ |
\( T^{2} + 11T - 4458 \)
|
| $5$ |
\( T^{2} + 69T - 39204 \)
|
| $7$ |
\( T^{2} + 348T - 849421 \)
|
| $11$ |
\( T^{2} - 2723 T + 1849194 \)
|
| $13$ |
\( T^{2} + 14113 T + 47419908 \)
|
| $17$ |
\( T^{2} + 38560 T + 304915287 \)
|
| $19$ |
\( (T - 6859)^{2} \)
|
| $23$ |
\( T^{2} + 73897 T + 727281168 \)
|
| $29$ |
\( T^{2} + \cdots - 10315913526 \)
|
| $31$ |
\( T^{2} + \cdots + 16830838944 \)
|
| $37$ |
\( T^{2} + \cdots + 17489301548 \)
|
| $41$ |
\( T^{2} + \cdots + 249116260800 \)
|
| $43$ |
\( T^{2} + \cdots - 224831764452 \)
|
| $47$ |
\( T^{2} + \cdots + 485859505512 \)
|
| $53$ |
\( T^{2} + \cdots - 1418308915764 \)
|
| $59$ |
\( T^{2} + \cdots - 405173436054 \)
|
| $61$ |
\( T^{2} + \cdots + 1928935887694 \)
|
| $67$ |
\( T^{2} + \cdots - 12718841223612 \)
|
| $71$ |
\( T^{2} + \cdots + 1157380019748 \)
|
| $73$ |
\( T^{2} + \cdots - 4028508966511 \)
|
| $79$ |
\( T^{2} + \cdots + 11081929595552 \)
|
| $83$ |
\( T^{2} + \cdots - 991765457112 \)
|
| $89$ |
\( T^{2} + \cdots + 64480164517536 \)
|
| $97$ |
\( T^{2} + \cdots - 97107139603184 \)
|
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