Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [2304,4,Mod(1,2304)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(2304, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 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("2304.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 2304 = 2^{8} \cdot 3^{2} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 2304.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: | \(135.940400653\) |
| 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: | \(\Z[a_1, \ldots, a_{43}]\) |
| Coefficient ring index: | \( 2 \) |
| Twist minimal: | no (minimal twist has level 128) |
| Fricke sign: | \(1\) |
| Sato-Tate group: | $N(\mathrm{U}(1))$ |
$q$-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 \(\beta = 2\sqrt{2}\). 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 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||||||||
| 1.2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(3\) | \(-1\) |
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 8.d | odd | 2 | 1 | CM by \(\Q(\sqrt{-2}) \) |
| 4.b | odd | 2 | 1 | inner |
| 8.b | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 2304.4.a.bf | 2 | |
| 3.b | odd | 2 | 1 | 256.4.a.k | 2 | ||
| 4.b | odd | 2 | 1 | inner | 2304.4.a.bf | 2 | |
| 8.b | even | 2 | 1 | inner | 2304.4.a.bf | 2 | |
| 8.d | odd | 2 | 1 | CM | 2304.4.a.bf | 2 | |
| 12.b | even | 2 | 1 | 256.4.a.k | 2 | ||
| 16.e | even | 4 | 2 | 1152.4.d.e | 2 | ||
| 16.f | odd | 4 | 2 | 1152.4.d.e | 2 | ||
| 24.f | even | 2 | 1 | 256.4.a.k | 2 | ||
| 24.h | odd | 2 | 1 | 256.4.a.k | 2 | ||
| 48.i | odd | 4 | 2 | 128.4.b.b | ✓ | 2 | |
| 48.k | even | 4 | 2 | 128.4.b.b | ✓ | 2 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 128.4.b.b | ✓ | 2 | 48.i | odd | 4 | 2 | |
| 128.4.b.b | ✓ | 2 | 48.k | even | 4 | 2 | |
| 256.4.a.k | 2 | 3.b | odd | 2 | 1 | ||
| 256.4.a.k | 2 | 12.b | even | 2 | 1 | ||
| 256.4.a.k | 2 | 24.f | even | 2 | 1 | ||
| 256.4.a.k | 2 | 24.h | odd | 2 | 1 | ||
| 1152.4.d.e | 2 | 16.e | even | 4 | 2 | ||
| 1152.4.d.e | 2 | 16.f | odd | 4 | 2 | ||
| 2304.4.a.bf | 2 | 1.a | even | 1 | 1 | trivial | |
| 2304.4.a.bf | 2 | 4.b | odd | 2 | 1 | inner | |
| 2304.4.a.bf | 2 | 8.b | even | 2 | 1 | inner | |
| 2304.4.a.bf | 2 | 8.d | odd | 2 | 1 | CM | |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(2304))\):
|
\( T_{5} \)
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\( T_{7} \)
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\( T_{11}^{2} - 5000 \)
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\( T_{13} \)
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\( T_{17} - 90 \)
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\( T_{19}^{2} - 16200 \)
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Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} \)
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| $3$ |
\( T^{2} \)
|
| $5$ |
\( T^{2} \)
|
| $7$ |
\( T^{2} \)
|
| $11$ |
\( T^{2} - 5000 \)
|
| $13$ |
\( T^{2} \)
|
| $17$ |
\( (T - 90)^{2} \)
|
| $19$ |
\( T^{2} - 16200 \)
|
| $23$ |
\( T^{2} \)
|
| $29$ |
\( T^{2} \)
|
| $31$ |
\( T^{2} \)
|
| $37$ |
\( T^{2} \)
|
| $41$ |
\( (T - 522)^{2} \)
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| $43$ |
\( T^{2} - 233928 \)
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| $47$ |
\( T^{2} \)
|
| $53$ |
\( T^{2} \)
|
| $59$ |
\( T^{2} - 105800 \)
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| $61$ |
\( T^{2} \)
|
| $67$ |
\( T^{2} - 1198152 \)
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| $71$ |
\( T^{2} \)
|
| $73$ |
\( (T + 430)^{2} \)
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| $79$ |
\( T^{2} \)
|
| $83$ |
\( T^{2} - 464648 \)
|
| $89$ |
\( (T + 1026)^{2} \)
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| $97$ |
\( (T - 1910)^{2} \)
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