Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [25,38,Mod(24,25)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(25, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1]))
N = Newforms(chi, 38, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("25.24");
S:= CuspForms(chi, 38);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 25 = 5^{2} \) |
| Weight: | \( k \) | \(=\) | \( 38 \) |
| Character orbit: | \([\chi]\) | \(=\) | 25.b (of order \(2\), degree \(1\), 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: | \(216.785095312\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\mathbb{Q}[x]/(x^{4} + \cdots)\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 31868761x^{2} + 253904465984400 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{13}]\) |
| Coefficient ring index: | \( 2^{12}\cdot 3^{2}\cdot 5^{4} \) |
| Twist minimal: | no (minimal twist has level 1) |
| 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
\( x^{4} + 31868761x^{2} + 253904465984400 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( 4\nu^{3} + 191212564\nu ) / 1327865 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( 5\nu^{3} + 79671905\nu ) / 1593438 \)
|
| \(\beta_{3}\) | \(=\) |
\( 4800\nu^{2} + 76485026400 \)
|
| \(\nu\) | \(=\) |
\( ( -24\beta_{2} + 25\beta_1 ) / 2400 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{3} - 76485026400 ) / 4800 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( 1147275384\beta_{2} - 398359525\beta_1 ) / 2400 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/25\mathbb{Z}\right)^\times\).
| \(n\) | \(2\) |
| \(\chi(n)\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 24.1 |
|
− | 480412.i | − | 3.45869e7i | −9.33565e10 | 0 | −1.66160e13 | − | 5.42222e15i | − | 2.11777e16i | 4.49088e17 | 0 | ||||||||||||||||||||||||||
| 24.2 | − | 286012.i | − | 2.05955e7i | 5.56362e10 | 0 | −5.89057e12 | − | 1.97377e15i | − | 5.52218e16i | 4.49860e17 | 0 | |||||||||||||||||||||||||||
| 24.3 | 286012.i | 2.05955e7i | 5.56362e10 | 0 | −5.89057e12 | 1.97377e15i | 5.52218e16i | 4.49860e17 | 0 | |||||||||||||||||||||||||||||||
| 24.4 | 480412.i | 3.45869e7i | −9.33565e10 | 0 | −1.66160e13 | 5.42222e15i | 2.11777e16i | 4.49088e17 | 0 | |||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 5.b | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 25.38.b.a | 4 | |
| 5.b | even | 2 | 1 | inner | 25.38.b.a | 4 | |
| 5.c | odd | 4 | 1 | 1.38.a.a | ✓ | 2 | |
| 5.c | odd | 4 | 1 | 25.38.a.a | 2 | ||
| 15.e | even | 4 | 1 | 9.38.a.a | 2 | ||
| 20.e | even | 4 | 1 | 16.38.a.b | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 1.38.a.a | ✓ | 2 | 5.c | odd | 4 | 1 | |
| 9.38.a.a | 2 | 15.e | even | 4 | 1 | ||
| 16.38.a.b | 2 | 20.e | even | 4 | 1 | ||
| 25.38.a.a | 2 | 5.c | odd | 4 | 1 | ||
| 25.38.b.a | 4 | 1.a | even | 1 | 1 | trivial | |
| 25.38.b.a | 4 | 5.b | even | 2 | 1 | inner | |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{4} + 312598176768T_{2}^{2} + 18879696635540281491456 \)
acting on \(S_{38}^{\mathrm{new}}(25, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} + \cdots + 18\!\cdots\!56 \)
|
| $3$ |
\( T^{4} + \cdots + 50\!\cdots\!36 \)
|
| $5$ |
\( T^{4} \)
|
| $7$ |
\( T^{4} + \cdots + 11\!\cdots\!96 \)
|
| $11$ |
\( (T^{2} + \cdots + 26\!\cdots\!84)^{2} \)
|
| $13$ |
\( T^{4} + \cdots + 44\!\cdots\!76 \)
|
| $17$ |
\( T^{4} + \cdots + 36\!\cdots\!76 \)
|
| $19$ |
\( (T^{2} + \cdots - 21\!\cdots\!00)^{2} \)
|
| $23$ |
\( T^{4} + \cdots + 45\!\cdots\!16 \)
|
| $29$ |
\( (T^{2} + \cdots - 37\!\cdots\!00)^{2} \)
|
| $31$ |
\( (T^{2} + \cdots - 61\!\cdots\!56)^{2} \)
|
| $37$ |
\( T^{4} + \cdots + 65\!\cdots\!36 \)
|
| $41$ |
\( (T^{2} + \cdots + 34\!\cdots\!24)^{2} \)
|
| $43$ |
\( T^{4} + \cdots + 10\!\cdots\!96 \)
|
| $47$ |
\( T^{4} + \cdots + 57\!\cdots\!16 \)
|
| $53$ |
\( T^{4} + \cdots + 19\!\cdots\!36 \)
|
| $59$ |
\( (T^{2} + \cdots - 19\!\cdots\!00)^{2} \)
|
| $61$ |
\( (T^{2} + \cdots - 12\!\cdots\!16)^{2} \)
|
| $67$ |
\( T^{4} + \cdots + 42\!\cdots\!76 \)
|
| $71$ |
\( (T^{2} + \cdots - 44\!\cdots\!36)^{2} \)
|
| $73$ |
\( T^{4} + \cdots + 92\!\cdots\!16 \)
|
| $79$ |
\( (T^{2} + \cdots + 18\!\cdots\!00)^{2} \)
|
| $83$ |
\( T^{4} + \cdots + 22\!\cdots\!56 \)
|
| $89$ |
\( (T^{2} + \cdots - 35\!\cdots\!00)^{2} \)
|
| $97$ |
\( T^{4} + \cdots + 57\!\cdots\!16 \)
|
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