Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [378,4,Mod(1,378)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(378, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([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("378.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 378 = 2 \cdot 3^{3} \cdot 7 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 378.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: | \(22.3027219822\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{23}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - 23 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 3 \) |
| 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 \(\beta = 3\sqrt{23}\). We also show the integral \(q\)-expansion of the trace form.
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 | 0 | 4.00000 | −18.3875 | 0 | −7.00000 | 8.00000 | 0 | −36.7750 | ||||||||||||||||||||||||
| 1.2 | 2.00000 | 0 | 4.00000 | 10.3875 | 0 | −7.00000 | 8.00000 | 0 | 20.7750 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(3\) | \(-1\) |
| \(7\) | \(1\) |
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 | 378.4.a.q | yes | 2 |
| 3.b | odd | 2 | 1 | 378.4.a.n | ✓ | 2 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 378.4.a.n | ✓ | 2 | 3.b | odd | 2 | 1 | |
| 378.4.a.q | yes | 2 | 1.a | even | 1 | 1 | trivial |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(378))\):
|
\( T_{5}^{2} + 8T_{5} - 191 \)
|
|
\( T_{11}^{2} - 20T_{11} - 1763 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T - 2)^{2} \)
|
| $3$ |
\( T^{2} \)
|
| $5$ |
\( T^{2} + 8T - 191 \)
|
| $7$ |
\( (T + 7)^{2} \)
|
| $11$ |
\( T^{2} - 20T - 1763 \)
|
| $13$ |
\( T^{2} - 72T + 468 \)
|
| $17$ |
\( (T - 88)^{2} \)
|
| $19$ |
\( T^{2} + 38T - 12887 \)
|
| $23$ |
\( T^{2} - 224T + 10681 \)
|
| $29$ |
\( T^{2} - 124T + 532 \)
|
| $31$ |
\( T^{2} - 126T - 63099 \)
|
| $37$ |
\( T^{2} - 118T + 2653 \)
|
| $41$ |
\( T^{2} - 36T - 59499 \)
|
| $43$ |
\( T^{2} + 68T + 328 \)
|
| $47$ |
\( T^{2} - 132T - 95832 \)
|
| $53$ |
\( T^{2} - 480T - 154368 \)
|
| $59$ |
\( T^{2} - 1084 T + 226696 \)
|
| $61$ |
\( T^{2} + 360T - 368352 \)
|
| $67$ |
\( T^{2} + 928T + 174724 \)
|
| $71$ |
\( T^{2} - 872T + 80593 \)
|
| $73$ |
\( T^{2} + 1660 T + 548968 \)
|
| $79$ |
\( T^{2} - 1236T + 83016 \)
|
| $83$ |
\( T^{2} + 484T + 28756 \)
|
| $89$ |
\( T^{2} - 108T - 2259 \)
|
| $97$ |
\( T^{2} - 800 T - 1035632 \)
|
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