Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [168,4,Mod(125,168)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(168, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 1, 1, 1]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("168.125");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 168 = 2^{3} \cdot 3 \cdot 7 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 168.i (of order \(2\), degree \(1\), minimal) |
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: | no |
| Analytic conductor: | \(9.91232088096\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\sqrt{2}, \sqrt{-3})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 2x^{2} + 4 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 2^{2}\cdot 3^{2} \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{U}(1)[D_{2}]$ |
$q$-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
\( x^{4} + 2x^{2} + 4 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( \nu^{3} ) / 2 \)
|
| \(\beta_{2}\) | \(=\) |
\( 3\nu^{2} + 3 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( 3\nu^{3} + 12\nu ) / 2 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{3} - 3\beta_1 ) / 6 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{2} - 3 ) / 3 \)
|
| \(\nu^{3}\) | \(=\) |
\( 2\beta_1 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/168\mathbb{Z}\right)^\times\).
| \(n\) | \(73\) | \(85\) | \(113\) | \(127\) |
| \(\chi(n)\) | \(-1\) | \(-1\) | \(-1\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 125.1 |
|
−2.82843 | − | 5.19615i | 8.00000 | − | 10.3923i | 14.6969i | −17.0000 | + | 7.34847i | −22.6274 | −27.0000 | 29.3939i | ||||||||||||||||||||||||||
| 125.2 | −2.82843 | 5.19615i | 8.00000 | 10.3923i | − | 14.6969i | −17.0000 | − | 7.34847i | −22.6274 | −27.0000 | − | 29.3939i | |||||||||||||||||||||||||||
| 125.3 | 2.82843 | − | 5.19615i | 8.00000 | − | 10.3923i | − | 14.6969i | −17.0000 | − | 7.34847i | 22.6274 | −27.0000 | − | 29.3939i | |||||||||||||||||||||||||
| 125.4 | 2.82843 | 5.19615i | 8.00000 | 10.3923i | 14.6969i | −17.0000 | + | 7.34847i | 22.6274 | −27.0000 | 29.3939i | |||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 24.h | odd | 2 | 1 | CM by \(\Q(\sqrt{-6}) \) |
| 3.b | odd | 2 | 1 | inner |
| 7.b | odd | 2 | 1 | inner |
| 8.b | even | 2 | 1 | inner |
| 21.c | even | 2 | 1 | inner |
| 56.h | odd | 2 | 1 | inner |
| 168.i | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 168.4.i.a | ✓ | 4 |
| 3.b | odd | 2 | 1 | inner | 168.4.i.a | ✓ | 4 |
| 4.b | odd | 2 | 1 | 672.4.i.a | 4 | ||
| 7.b | odd | 2 | 1 | inner | 168.4.i.a | ✓ | 4 |
| 8.b | even | 2 | 1 | inner | 168.4.i.a | ✓ | 4 |
| 8.d | odd | 2 | 1 | 672.4.i.a | 4 | ||
| 12.b | even | 2 | 1 | 672.4.i.a | 4 | ||
| 21.c | even | 2 | 1 | inner | 168.4.i.a | ✓ | 4 |
| 24.f | even | 2 | 1 | 672.4.i.a | 4 | ||
| 24.h | odd | 2 | 1 | CM | 168.4.i.a | ✓ | 4 |
| 28.d | even | 2 | 1 | 672.4.i.a | 4 | ||
| 56.e | even | 2 | 1 | 672.4.i.a | 4 | ||
| 56.h | odd | 2 | 1 | inner | 168.4.i.a | ✓ | 4 |
| 84.h | odd | 2 | 1 | 672.4.i.a | 4 | ||
| 168.e | odd | 2 | 1 | 672.4.i.a | 4 | ||
| 168.i | even | 2 | 1 | inner | 168.4.i.a | ✓ | 4 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 168.4.i.a | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 168.4.i.a | ✓ | 4 | 3.b | odd | 2 | 1 | inner |
| 168.4.i.a | ✓ | 4 | 7.b | odd | 2 | 1 | inner |
| 168.4.i.a | ✓ | 4 | 8.b | even | 2 | 1 | inner |
| 168.4.i.a | ✓ | 4 | 21.c | even | 2 | 1 | inner |
| 168.4.i.a | ✓ | 4 | 24.h | odd | 2 | 1 | CM |
| 168.4.i.a | ✓ | 4 | 56.h | odd | 2 | 1 | inner |
| 168.4.i.a | ✓ | 4 | 168.i | even | 2 | 1 | inner |
| 672.4.i.a | 4 | 4.b | odd | 2 | 1 | ||
| 672.4.i.a | 4 | 8.d | odd | 2 | 1 | ||
| 672.4.i.a | 4 | 12.b | even | 2 | 1 | ||
| 672.4.i.a | 4 | 24.f | even | 2 | 1 | ||
| 672.4.i.a | 4 | 28.d | even | 2 | 1 | ||
| 672.4.i.a | 4 | 56.e | even | 2 | 1 | ||
| 672.4.i.a | 4 | 84.h | odd | 2 | 1 | ||
| 672.4.i.a | 4 | 168.e | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{5}^{2} + 108 \)
acting on \(S_{4}^{\mathrm{new}}(168, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T^{2} - 8)^{2} \)
|
| $3$ |
\( (T^{2} + 27)^{2} \)
|
| $5$ |
\( (T^{2} + 108)^{2} \)
|
| $7$ |
\( (T^{2} + 34 T + 343)^{2} \)
|
| $11$ |
\( (T^{2} - 32)^{2} \)
|
| $13$ |
\( T^{4} \)
|
| $17$ |
\( T^{4} \)
|
| $19$ |
\( T^{4} \)
|
| $23$ |
\( T^{4} \)
|
| $29$ |
\( (T^{2} - 49928)^{2} \)
|
| $31$ |
\( (T^{2} + 114264)^{2} \)
|
| $37$ |
\( T^{4} \)
|
| $41$ |
\( T^{4} \)
|
| $43$ |
\( T^{4} \)
|
| $47$ |
\( T^{4} \)
|
| $53$ |
\( (T^{2} - 336200)^{2} \)
|
| $59$ |
\( (T^{2} + 514188)^{2} \)
|
| $61$ |
\( T^{4} \)
|
| $67$ |
\( T^{4} \)
|
| $71$ |
\( T^{4} \)
|
| $73$ |
\( (T^{2} + 1452384)^{2} \)
|
| $79$ |
\( (T + 1370)^{4} \)
|
| $83$ |
\( (T^{2} + 780300)^{2} \)
|
| $89$ |
\( T^{4} \)
|
| $97$ |
\( (T^{2} + 3321216)^{2} \)
|
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