Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [496,4,Mod(1,496)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(496, 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("496.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 496 = 2^{4} \cdot 31 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 496.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: | \(29.2649473628\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | 4.4.841724.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} - 16x^{2} + 11x + 7 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 2 \) |
| Twist minimal: | no (minimal twist has level 124) |
| 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 \(1,\beta_1,\beta_2,\beta_3\) 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
\( x^{4} - x^{3} - 16x^{2} + 11x + 7 \)
:
| \(\beta_{1}\) | \(=\) |
\( 2\nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( \nu^{3} + \nu^{2} - 17\nu - 8 ) / 3 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( \nu^{3} - 2\nu^{2} - 14\nu + 16 ) / 3 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_1 ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( -2\beta_{3} + 2\beta_{2} + \beta _1 + 16 ) / 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{3} + 2\beta_{2} + 8\beta_1 \)
|
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.1 |
|
0 | −4.12869 | 0 | −10.8920 | 0 | 29.9908 | 0 | −9.95389 | 0 | ||||||||||||||||||||||||||||||
| 1.2 | 0 | −0.830383 | 0 | −18.0162 | 0 | −33.6654 | 0 | −26.3105 | 0 | |||||||||||||||||||||||||||||||
| 1.3 | 0 | 0.864858 | 0 | 2.57292 | 0 | 20.6112 | 0 | −26.2520 | 0 | |||||||||||||||||||||||||||||||
| 1.4 | 0 | 8.09422 | 0 | 12.3353 | 0 | −4.93663 | 0 | 38.5164 | 0 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(31\) | \(-1\) |
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 | 496.4.a.h | 4 | |
| 4.b | odd | 2 | 1 | 124.4.a.a | ✓ | 4 | |
| 8.b | even | 2 | 1 | 1984.4.a.k | 4 | ||
| 8.d | odd | 2 | 1 | 1984.4.a.p | 4 | ||
| 12.b | even | 2 | 1 | 1116.4.a.g | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 124.4.a.a | ✓ | 4 | 4.b | odd | 2 | 1 | |
| 496.4.a.h | 4 | 1.a | even | 1 | 1 | trivial | |
| 1116.4.a.g | 4 | 12.b | even | 2 | 1 | ||
| 1984.4.a.k | 4 | 8.b | even | 2 | 1 | ||
| 1984.4.a.p | 4 | 8.d | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{4} - 4T_{3}^{3} - 34T_{3}^{2} + 4T_{3} + 24 \)
acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(496))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} - 4 T^{3} + \cdots + 24 \)
|
| $5$ |
\( T^{4} + 14 T^{3} + \cdots + 6228 \)
|
| $7$ |
\( T^{4} - 12 T^{3} + \cdots + 102732 \)
|
| $11$ |
\( T^{4} - 98 T^{3} + \cdots - 124296 \)
|
| $13$ |
\( T^{4} + 128 T^{3} + \cdots - 10082792 \)
|
| $17$ |
\( T^{4} + 86 T^{3} + \cdots + 33154416 \)
|
| $19$ |
\( T^{4} - 116 T^{3} + \cdots + 36966128 \)
|
| $23$ |
\( T^{4} - 214 T^{3} + \cdots - 2911744 \)
|
| $29$ |
\( T^{4} + 168 T^{3} + \cdots - 245403688 \)
|
| $31$ |
\( (T - 31)^{4} \)
|
| $37$ |
\( T^{4} + \cdots - 1278468840 \)
|
| $41$ |
\( T^{4} + \cdots + 9561006744 \)
|
| $43$ |
\( T^{4} + \cdots + 3938013320 \)
|
| $47$ |
\( T^{4} + \cdots + 8434470080 \)
|
| $53$ |
\( T^{4} + \cdots + 3143843424 \)
|
| $59$ |
\( T^{4} + \cdots - 28173754200 \)
|
| $61$ |
\( T^{4} + \cdots + 48768423288 \)
|
| $67$ |
\( T^{4} + \cdots + 34989096960 \)
|
| $71$ |
\( T^{4} + \cdots - 18360511296 \)
|
| $73$ |
\( T^{4} + \cdots - 39620287696 \)
|
| $79$ |
\( T^{4} + \cdots - 1265961056 \)
|
| $83$ |
\( T^{4} + \cdots - 19929689864 \)
|
| $89$ |
\( T^{4} + \cdots - 337618042704 \)
|
| $97$ |
\( T^{4} + \cdots + 1478985763416 \)
|
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