Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [798,4,Mod(1,798)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(798, 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("798.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 798 = 2 \cdot 3 \cdot 7 \cdot 19 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 798.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: | \(47.0835241846\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\mathbb{Q}[x]/(x^{4} - \cdots)\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - 2x^{3} - 350x^{2} - 180x + 19400 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{13}]\) |
| Coefficient ring index: | \( 2^{2} \) |
| Twist minimal: | yes |
| 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
\( x^{4} - 2x^{3} - 350x^{2} - 180x + 19400 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -\nu^{3} - 3\nu^{2} + 245\nu + 1045 ) / 45 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( -\nu^{3} + 12\nu^{2} + 200\nu - 1550 ) / 30 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( 2\beta_{3} - 3\beta_{2} + 3\beta _1 + 173 \)
|
| \(\nu^{3}\) | \(=\) |
\( -6\beta_{3} - 36\beta_{2} + 236\beta _1 + 526 \)
|
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 |
|
2.00000 | −3.00000 | 4.00000 | −20.4247 | −6.00000 | 7.00000 | 8.00000 | 9.00000 | −40.8495 | ||||||||||||||||||||||||||||||
| 1.2 | 2.00000 | −3.00000 | 4.00000 | −9.66700 | −6.00000 | 7.00000 | 8.00000 | 9.00000 | −19.3340 | |||||||||||||||||||||||||||||||
| 1.3 | 2.00000 | −3.00000 | 4.00000 | 7.25841 | −6.00000 | 7.00000 | 8.00000 | 9.00000 | 14.5168 | |||||||||||||||||||||||||||||||
| 1.4 | 2.00000 | −3.00000 | 4.00000 | 12.8333 | −6.00000 | 7.00000 | 8.00000 | 9.00000 | 25.6667 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(3\) | \(1\) |
| \(7\) | \(-1\) |
| \(19\) | \(1\) |
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 | 798.4.a.q | ✓ | 4 |
| 3.b | odd | 2 | 1 | 2394.4.a.r | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 798.4.a.q | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 2394.4.a.r | 4 | 3.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{5}^{4} + 10T_{5}^{3} - 314T_{5}^{2} - 1164T_{5} + 18392 \)
acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(798))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T - 2)^{4} \)
|
| $3$ |
\( (T + 3)^{4} \)
|
| $5$ |
\( T^{4} + 10 T^{3} + \cdots + 18392 \)
|
| $7$ |
\( (T - 7)^{4} \)
|
| $11$ |
\( T^{4} - 48 T^{3} + \cdots - 483040 \)
|
| $13$ |
\( T^{4} - 46 T^{3} + \cdots + 326912 \)
|
| $17$ |
\( T^{4} + 96 T^{3} + \cdots - 219488 \)
|
| $19$ |
\( (T + 19)^{4} \)
|
| $23$ |
\( T^{4} - 46 T^{3} + \cdots - 20561312 \)
|
| $29$ |
\( T^{4} - 328 T^{3} + \cdots - 26453192 \)
|
| $31$ |
\( T^{4} - 14 T^{3} + \cdots - 77177392 \)
|
| $37$ |
\( T^{4} - 78 T^{3} + \cdots + 222526800 \)
|
| $41$ |
\( T^{4} + \cdots + 5523080240 \)
|
| $43$ |
\( T^{4} + \cdots - 1970777920 \)
|
| $47$ |
\( T^{4} + \cdots + 6592339080 \)
|
| $53$ |
\( T^{4} + \cdots - 8345083400 \)
|
| $59$ |
\( T^{4} + \cdots - 18095800320 \)
|
| $61$ |
\( T^{4} + \cdots + 16471717360 \)
|
| $67$ |
\( T^{4} + \cdots + 2512334560 \)
|
| $71$ |
\( T^{4} + \cdots + 120832659488 \)
|
| $73$ |
\( T^{4} + \cdots - 44719816720 \)
|
| $79$ |
\( T^{4} + \cdots - 61669098880 \)
|
| $83$ |
\( T^{4} + \cdots + 883749719840 \)
|
| $89$ |
\( T^{4} + \cdots + 487651263728 \)
|
| $97$ |
\( T^{4} + \cdots + 1437496946752 \)
|
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