Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1225,4,Mod(1,1225)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1225, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("1225.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1225 = 5^{2} \cdot 7^{2} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1225.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: | \(72.2773397570\) |
| Analytic rank: | \(1\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{2}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - 2 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{19}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 245) |
| 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 \(\beta = \sqrt{2}\). 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 |
|
3.00000 | −8.48528 | 1.00000 | 0 | −25.4558 | 0 | −21.0000 | 45.0000 | 0 | ||||||||||||||||||||||||
| 1.2 | 3.00000 | 8.48528 | 1.00000 | 0 | 25.4558 | 0 | −21.0000 | 45.0000 | 0 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(5\) | \(-1\) |
| \(7\) | \(1\) |
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 7.b | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 1225.4.a.w | 2 | |
| 5.b | even | 2 | 1 | 1225.4.a.n | 2 | ||
| 5.c | odd | 4 | 2 | 245.4.b.b | ✓ | 4 | |
| 7.b | odd | 2 | 1 | inner | 1225.4.a.w | 2 | |
| 35.c | odd | 2 | 1 | 1225.4.a.n | 2 | ||
| 35.f | even | 4 | 2 | 245.4.b.b | ✓ | 4 | |
| 35.k | even | 12 | 4 | 245.4.j.b | 8 | ||
| 35.l | odd | 12 | 4 | 245.4.j.b | 8 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 245.4.b.b | ✓ | 4 | 5.c | odd | 4 | 2 | |
| 245.4.b.b | ✓ | 4 | 35.f | even | 4 | 2 | |
| 245.4.j.b | 8 | 35.k | even | 12 | 4 | ||
| 245.4.j.b | 8 | 35.l | odd | 12 | 4 | ||
| 1225.4.a.n | 2 | 5.b | even | 2 | 1 | ||
| 1225.4.a.n | 2 | 35.c | odd | 2 | 1 | ||
| 1225.4.a.w | 2 | 1.a | even | 1 | 1 | trivial | |
| 1225.4.a.w | 2 | 7.b | odd | 2 | 1 | inner | |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(1225))\):
|
\( T_{2} - 3 \)
|
|
\( T_{3}^{2} - 72 \)
|
|
\( T_{19}^{2} - 19208 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T - 3)^{2} \)
|
| $3$ |
\( T^{2} - 72 \)
|
| $5$ |
\( T^{2} \)
|
| $7$ |
\( T^{2} \)
|
| $11$ |
\( (T + 40)^{2} \)
|
| $13$ |
\( T^{2} - 5202 \)
|
| $17$ |
\( T^{2} - 882 \)
|
| $19$ |
\( T^{2} - 19208 \)
|
| $23$ |
\( (T + 12)^{2} \)
|
| $29$ |
\( (T + 40)^{2} \)
|
| $31$ |
\( T^{2} - 3872 \)
|
| $37$ |
\( (T - 318)^{2} \)
|
| $41$ |
\( T^{2} - 49298 \)
|
| $43$ |
\( (T + 360)^{2} \)
|
| $47$ |
\( T^{2} - 115200 \)
|
| $53$ |
\( (T - 144)^{2} \)
|
| $59$ |
\( T^{2} - 17672 \)
|
| $61$ |
\( T^{2} - 837218 \)
|
| $67$ |
\( (T + 36)^{2} \)
|
| $71$ |
\( (T + 148)^{2} \)
|
| $73$ |
\( T^{2} - 399618 \)
|
| $79$ |
\( (T + 612)^{2} \)
|
| $83$ |
\( T^{2} - 677448 \)
|
| $89$ |
\( T^{2} - 960498 \)
|
| $97$ |
\( T^{2} - 882 \)
|
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