Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [7448,2,Mod(1,7448)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(7448, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 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("7448.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 7448 = 2^{3} \cdot 7^{2} \cdot 19 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 7448.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: | \(59.4725794254\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | 4.4.18097.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} - 7x^{2} + 6x + 4 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 1064) |
| 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
\( x^{4} - x^{3} - 7x^{2} + 6x + 4 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( \nu^{3} + \nu^{2} - 5\nu - 4 ) / 2 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( \nu^{3} - \nu^{2} - 5\nu + 4 ) / 2 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( -\beta_{3} + \beta_{2} + 4 \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{3} + \beta_{2} + 5\beta_1 \)
|
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 | −2.98044 | 0 | −2.79634 | 0 | 0 | 0 | 5.88302 | 0 | ||||||||||||||||||||||||||||||
| 1.2 | 0 | −0.803452 | 0 | 3.65103 | 0 | 0 | 0 | −2.35447 | 0 | |||||||||||||||||||||||||||||||
| 1.3 | 0 | 1.08185 | 0 | −1.11245 | 0 | 0 | 0 | −1.82961 | 0 | |||||||||||||||||||||||||||||||
| 1.4 | 0 | 2.70205 | 0 | 3.25776 | 0 | 0 | 0 | 4.30105 | 0 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(7\) | \(-1\) |
| \(19\) | \(-1\) |
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 | 7448.2.a.bk | 4 | |
| 7.b | odd | 2 | 1 | 1064.2.a.g | ✓ | 4 | |
| 21.c | even | 2 | 1 | 9576.2.a.ck | 4 | ||
| 28.d | even | 2 | 1 | 2128.2.a.u | 4 | ||
| 56.e | even | 2 | 1 | 8512.2.a.bt | 4 | ||
| 56.h | odd | 2 | 1 | 8512.2.a.bs | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 1064.2.a.g | ✓ | 4 | 7.b | odd | 2 | 1 | |
| 2128.2.a.u | 4 | 28.d | even | 2 | 1 | ||
| 7448.2.a.bk | 4 | 1.a | even | 1 | 1 | trivial | |
| 8512.2.a.bs | 4 | 56.h | odd | 2 | 1 | ||
| 8512.2.a.bt | 4 | 56.e | even | 2 | 1 | ||
| 9576.2.a.ck | 4 | 21.c | even | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(7448))\):
|
\( T_{3}^{4} - 9T_{3}^{2} + 2T_{3} + 7 \)
|
|
\( T_{5}^{4} - 3T_{5}^{3} - 12T_{5}^{2} + 25T_{5} + 37 \)
|
|
\( T_{11}^{4} - 6T_{11}^{3} + T_{11}^{2} + 8T_{11} - 1 \)
|
|
\( T_{13}^{4} - 4T_{13}^{3} - 39T_{13}^{2} + 126T_{13} + 108 \)
|
|
\( T_{17}^{4} - 9T_{17}^{3} - 27T_{17}^{2} + 220T_{17} + 496 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} - 9 T^{2} + \cdots + 7 \)
|
| $5$ |
\( T^{4} - 3 T^{3} + \cdots + 37 \)
|
| $7$ |
\( T^{4} \)
|
| $11$ |
\( T^{4} - 6 T^{3} + \cdots - 1 \)
|
| $13$ |
\( T^{4} - 4 T^{3} + \cdots + 108 \)
|
| $17$ |
\( T^{4} - 9 T^{3} + \cdots + 496 \)
|
| $19$ |
\( (T - 1)^{4} \)
|
| $23$ |
\( T^{4} - 22 T^{3} + \cdots + 84 \)
|
| $29$ |
\( T^{4} + 6 T^{3} + \cdots - 229 \)
|
| $31$ |
\( T^{4} + 3 T^{3} + \cdots + 356 \)
|
| $37$ |
\( T^{4} - 15 T^{3} + \cdots - 3557 \)
|
| $41$ |
\( T^{4} - 20 T^{3} + \cdots + 417 \)
|
| $43$ |
\( T^{4} + 5 T^{3} + \cdots - 108 \)
|
| $47$ |
\( T^{4} + 29 T^{3} + \cdots + 2363 \)
|
| $53$ |
\( T^{4} - 14 T^{3} + \cdots - 3 \)
|
| $59$ |
\( T^{4} + 11 T^{3} + \cdots - 21 \)
|
| $61$ |
\( T^{4} + 15 T^{3} + \cdots + 6473 \)
|
| $67$ |
\( T^{4} - 9 T^{3} + \cdots - 2444 \)
|
| $71$ |
\( T^{4} - 7 T^{3} + \cdots + 39 \)
|
| $73$ |
\( T^{4} - 11 T^{3} + \cdots - 2164 \)
|
| $79$ |
\( T^{4} - 7 T^{3} + \cdots - 1228 \)
|
| $83$ |
\( T^{4} - 15 T^{3} + \cdots + 3984 \)
|
| $89$ |
\( T^{4} - 19 T^{3} + \cdots - 2732 \)
|
| $97$ |
\( T^{4} - 9 T^{3} + \cdots + 169 \)
|
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