Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [8820,2,Mod(1,8820)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(8820, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 0, 0]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("8820.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 8820 = 2^{2} \cdot 3^{2} \cdot 5 \cdot 7^{2} \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 8820.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: | \(70.4280545828\) |
| Analytic rank: | \(0\) |
| 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: | \(\Z[a_1, \ldots, a_{11}]\) |
| Coefficient ring index: | \( 3 \) |
| Twist minimal: | no (minimal twist has level 420) |
| 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 \(\beta = 3\sqrt{2}\). 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 |
|
0 | 0 | 0 | −1.00000 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||||||||
| 1.2 | 0 | 0 | 0 | −1.00000 | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(3\) | \(-1\) |
| \(5\) | \(1\) |
| \(7\) | \(-1\) |
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 | 8820.2.a.bf | 2 | |
| 3.b | odd | 2 | 1 | 2940.2.a.p | 2 | ||
| 7.b | odd | 2 | 1 | 8820.2.a.bk | 2 | ||
| 7.d | odd | 6 | 2 | 1260.2.s.e | 4 | ||
| 21.c | even | 2 | 1 | 2940.2.a.r | 2 | ||
| 21.g | even | 6 | 2 | 420.2.q.d | ✓ | 4 | |
| 21.h | odd | 6 | 2 | 2940.2.q.q | 4 | ||
| 84.j | odd | 6 | 2 | 1680.2.bg.t | 4 | ||
| 105.p | even | 6 | 2 | 2100.2.q.k | 4 | ||
| 105.w | odd | 12 | 4 | 2100.2.bc.f | 8 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 420.2.q.d | ✓ | 4 | 21.g | even | 6 | 2 | |
| 1260.2.s.e | 4 | 7.d | odd | 6 | 2 | ||
| 1680.2.bg.t | 4 | 84.j | odd | 6 | 2 | ||
| 2100.2.q.k | 4 | 105.p | even | 6 | 2 | ||
| 2100.2.bc.f | 8 | 105.w | odd | 12 | 4 | ||
| 2940.2.a.p | 2 | 3.b | odd | 2 | 1 | ||
| 2940.2.a.r | 2 | 21.c | even | 2 | 1 | ||
| 2940.2.q.q | 4 | 21.h | odd | 6 | 2 | ||
| 8820.2.a.bf | 2 | 1.a | even | 1 | 1 | trivial | |
| 8820.2.a.bk | 2 | 7.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(8820))\):
|
\( T_{11}^{2} - 18 \)
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\( T_{13}^{2} - 2T_{13} - 17 \)
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\( T_{17}^{2} - 18 \)
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\( T_{31}^{2} - 2T_{31} - 71 \)
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Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} \)
|
| $3$ |
\( T^{2} \)
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| $5$ |
\( (T + 1)^{2} \)
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| $7$ |
\( T^{2} \)
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| $11$ |
\( T^{2} - 18 \)
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| $13$ |
\( T^{2} - 2T - 17 \)
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| $17$ |
\( T^{2} - 18 \)
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| $19$ |
\( (T - 7)^{2} \)
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| $23$ |
\( T^{2} - 18 \)
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| $29$ |
\( T^{2} - 12T + 18 \)
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| $31$ |
\( T^{2} - 2T - 71 \)
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| $37$ |
\( T^{2} + 2T - 17 \)
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| $41$ |
\( T^{2} - 18 \)
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| $43$ |
\( T^{2} + 2T - 17 \)
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| $47$ |
\( (T + 6)^{2} \)
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| $53$ |
\( T^{2} - 72 \)
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| $59$ |
\( T^{2} + 12T + 18 \)
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| $61$ |
\( T^{2} - 8T - 56 \)
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| $67$ |
\( T^{2} + 2T - 17 \)
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| $71$ |
\( T^{2} - 162 \)
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| $73$ |
\( T^{2} + 10T + 7 \)
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| $79$ |
\( (T - 11)^{2} \)
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| $83$ |
\( T^{2} + 12T + 18 \)
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| $89$ |
\( T^{2} + 12T + 18 \)
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| $97$ |
\( T^{2} + 16T - 8 \)
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