Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [8464,2,Mod(1,8464)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(8464, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([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("8464.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 8464 = 2^{4} \cdot 23^{2} \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 8464.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: | \(67.5853802708\) |
| Analytic rank: | \(1\) |
| Dimension: | \(5\) |
| Coefficient field: | \(\Q(\zeta_{22})^+\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{5} - x^{4} - 4x^{3} + 3x^{2} + 3x - 1 \)
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| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 46) |
| 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 a basis \(1,\beta_1,\beta_2,\beta_3,\beta_4\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.
Basis of coefficient ring in terms of \(\nu = \zeta_{22} + \zeta_{22}^{-1}\):
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} - 2 \)
|
| \(\beta_{3}\) | \(=\) |
\( \nu^{3} - 3\nu \)
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| \(\beta_{4}\) | \(=\) |
\( \nu^{4} - 4\nu^{2} + 2 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{2} + 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{3} + 3\beta_1 \)
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| \(\nu^{4}\) | \(=\) |
\( \beta_{4} + 4\beta_{2} + 6 \)
|
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 | −1.39788 | 0 | −2.54620 | 0 | 2.08816 | 0 | −1.04594 | 0 | |||||||||||||||||||||||||||||||||
| 1.2 | 0 | −0.546200 | 0 | −0.911844 | 0 | 4.22871 | 0 | −2.70167 | 0 | ||||||||||||||||||||||||||||||||||
| 1.3 | 0 | −0.372786 | 0 | −3.39788 | 0 | 0.453800 | 0 | −2.86103 | 0 | ||||||||||||||||||||||||||||||||||
| 1.4 | 0 | 1.08816 | 0 | 1.22871 | 0 | 0.627214 | 0 | −1.81592 | 0 | ||||||||||||||||||||||||||||||||||
| 1.5 | 0 | 3.22871 | 0 | −2.37279 | 0 | −0.397877 | 0 | 7.42455 | 0 | ||||||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(23\) | \(-1\) |
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 | 8464.2.a.bw | 5 | |
| 4.b | odd | 2 | 1 | 1058.2.a.l | 5 | ||
| 12.b | even | 2 | 1 | 9522.2.a.bu | 5 | ||
| 23.b | odd | 2 | 1 | 8464.2.a.bx | 5 | ||
| 23.d | odd | 22 | 2 | 368.2.m.b | 10 | ||
| 92.b | even | 2 | 1 | 1058.2.a.m | 5 | ||
| 92.h | even | 22 | 2 | 46.2.c.a | ✓ | 10 | |
| 276.h | odd | 2 | 1 | 9522.2.a.bp | 5 | ||
| 276.j | odd | 22 | 2 | 414.2.i.f | 10 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 46.2.c.a | ✓ | 10 | 92.h | even | 22 | 2 | |
| 368.2.m.b | 10 | 23.d | odd | 22 | 2 | ||
| 414.2.i.f | 10 | 276.j | odd | 22 | 2 | ||
| 1058.2.a.l | 5 | 4.b | odd | 2 | 1 | ||
| 1058.2.a.m | 5 | 92.b | even | 2 | 1 | ||
| 8464.2.a.bw | 5 | 1.a | even | 1 | 1 | trivial | |
| 8464.2.a.bx | 5 | 23.b | odd | 2 | 1 | ||
| 9522.2.a.bp | 5 | 276.h | odd | 2 | 1 | ||
| 9522.2.a.bu | 5 | 12.b | even | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(8464))\):
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\( T_{3}^{5} - 2T_{3}^{4} - 5T_{3}^{3} + 2T_{3}^{2} + 4T_{3} + 1 \)
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\( T_{5}^{5} + 8T_{5}^{4} + 19T_{5}^{3} + 4T_{5}^{2} - 32T_{5} - 23 \)
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\( T_{7}^{5} - 7T_{7}^{4} + 13T_{7}^{3} - 5T_{7}^{2} - 2T_{7} + 1 \)
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\( T_{13}^{5} + 7T_{13}^{4} + 2T_{13}^{3} - 17T_{13}^{2} + 9T_{13} - 1 \)
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Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{5} \)
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| $3$ |
\( T^{5} - 2 T^{4} + \cdots + 1 \)
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| $5$ |
\( T^{5} + 8 T^{4} + \cdots - 23 \)
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| $7$ |
\( T^{5} - 7 T^{4} + \cdots + 1 \)
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| $11$ |
\( T^{5} - 5 T^{4} + \cdots - 331 \)
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| $13$ |
\( T^{5} + 7 T^{4} + \cdots - 1 \)
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| $17$ |
\( T^{5} + 13 T^{4} + \cdots - 463 \)
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| $19$ |
\( T^{5} - 12 T^{4} + \cdots - 67 \)
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| $23$ |
\( T^{5} \)
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| $29$ |
\( T^{5} + 4 T^{4} + \cdots + 67 \)
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| $31$ |
\( T^{5} + 6 T^{4} + \cdots + 4531 \)
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| $37$ |
\( T^{5} + 14 T^{4} + \cdots - 7061 \)
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| $41$ |
\( T^{5} - T^{4} + \cdots + 13133 \)
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| $43$ |
\( T^{5} - 11 T^{4} + \cdots - 2651 \)
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| $47$ |
\( T^{5} + 9 T^{4} + \cdots + 529 \)
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| $53$ |
\( T^{5} + 6 T^{4} + \cdots - 5589 \)
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| $59$ |
\( T^{5} + 3 T^{4} + \cdots + 67 \)
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| $61$ |
\( T^{5} + 13 T^{4} + \cdots - 18701 \)
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| $67$ |
\( T^{5} - 10 T^{4} + \cdots - 9701 \)
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| $71$ |
\( T^{5} + 8 T^{4} + \cdots + 2881 \)
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| $73$ |
\( T^{5} + 4 T^{4} + \cdots + 89 \)
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| $79$ |
\( T^{5} + 18 T^{4} + \cdots + 131 \)
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| $83$ |
\( T^{5} - 2 T^{4} + \cdots + 25829 \)
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| $89$ |
\( T^{5} + 10 T^{4} + \cdots - 5171 \)
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| $97$ |
\( T^{5} + 17 T^{4} + \cdots + 2243 \)
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