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: |
\( x^{4} - x^{3} - 98x^{2} + 87x + 335 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{13}]\) |
| Coefficient ring index: | \( 2^{4} \) |
| 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
\( x^{4} - x^{3} - 98x^{2} + 87x + 335 \)
:
| \(\beta_{1}\) | \(=\) |
\( 2\nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( 2\nu^{3} - 178\nu + 23 ) / 9 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( -2\nu^{3} + 18\nu^{2} + 142\nu - 905 ) / 45 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_1 ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( 5\beta_{3} + \beta_{2} + 2\beta _1 + 98 ) / 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( 9\beta_{2} + 89\beta _1 - 23 ) / 2 \)
|
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 | −17.3629 | −6.00000 | 7.00000 | −8.00000 | 9.00000 | 34.7258 | ||||||||||||||||||||||||||||||
| 1.2 | −2.00000 | 3.00000 | 4.00000 | −0.957876 | −6.00000 | 7.00000 | −8.00000 | 9.00000 | 1.91575 | |||||||||||||||||||||||||||||||
| 1.3 | −2.00000 | 3.00000 | 4.00000 | 6.79231 | −6.00000 | 7.00000 | −8.00000 | 9.00000 | −13.5846 | |||||||||||||||||||||||||||||||
| 1.4 | −2.00000 | 3.00000 | 4.00000 | 21.5285 | −6.00000 | 7.00000 | −8.00000 | 9.00000 | −43.0570 | |||||||||||||||||||||||||||||||
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.o | ✓ | 4 |
| 3.b | odd | 2 | 1 | 2394.4.a.u | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 798.4.a.o | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 2394.4.a.u | 4 | 3.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{5}^{4} - 10T_{5}^{3} - 356T_{5}^{2} + 2208T_{5} + 2432 \)
acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(798))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T + 2)^{4} \)
|
| $3$ |
\( (T - 3)^{4} \)
|
| $5$ |
\( T^{4} - 10 T^{3} + \cdots + 2432 \)
|
| $7$ |
\( (T - 7)^{4} \)
|
| $11$ |
\( T^{4} - 48 T^{3} + \cdots - 501760 \)
|
| $13$ |
\( T^{4} + 30 T^{3} + \cdots + 8168176 \)
|
| $17$ |
\( T^{4} - 128 T^{3} + \cdots - 2694656 \)
|
| $19$ |
\( (T + 19)^{4} \)
|
| $23$ |
\( T^{4} - 98 T^{3} + \cdots + 52362304 \)
|
| $29$ |
\( T^{4} - 144 T^{3} + \cdots + 144182144 \)
|
| $31$ |
\( T^{4} + \cdots + 1141675520 \)
|
| $37$ |
\( T^{4} - 222 T^{3} + \cdots - 336319920 \)
|
| $41$ |
\( T^{4} - 256 T^{3} + \cdots + 4297936 \)
|
| $43$ |
\( T^{4} - 188 T^{3} + \cdots + 151865600 \)
|
| $47$ |
\( T^{4} - 522 T^{3} + \cdots - 455539120 \)
|
| $53$ |
\( T^{4} + \cdots - 12067292480 \)
|
| $59$ |
\( T^{4} + \cdots - 40420480000 \)
|
| $61$ |
\( T^{4} + 108 T^{3} + \cdots + 237430000 \)
|
| $67$ |
\( T^{4} + \cdots + 90781535680 \)
|
| $71$ |
\( T^{4} + \cdots - 8944485568 \)
|
| $73$ |
\( T^{4} + \cdots - 169138117872 \)
|
| $79$ |
\( T^{4} + \cdots + 97788489664 \)
|
| $83$ |
\( T^{4} + \cdots - 12176175872 \)
|
| $89$ |
\( T^{4} + \cdots + 133010401808 \)
|
| $97$ |
\( T^{4} + \cdots + 150660647680 \)
|
| show more | |
| show less |