Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [28,12,Mod(1,28)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(28, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0]))
N = Newforms(chi, 12, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("28.1");
S:= CuspForms(chi, 12);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 28 = 2^{2} \cdot 7 \) |
| Weight: | \( k \) | \(=\) | \( 12 \) |
| Character orbit: | \([\chi]\) | \(=\) | 28.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: | \(21.5136090557\) |
| Analytic rank: | \(1\) |
| Dimension: | \(3\) |
| Coefficient field: | \(\mathbb{Q}[x]/(x^{3} - \cdots)\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{3} - x^{2} - 522x + 2520 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 2^{5}\cdot 7 \) |
| 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 \(1,\beta_1,\beta_2\) 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
\( x^{3} - x^{2} - 522x + 2520 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu^{2} + 27\nu - 357 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( 4\nu^{2} - 4\nu - 1392 ) / 3 \)
|
| \(\nu\) | \(=\) |
\( ( -3\beta_{2} + 4\beta _1 + 36 ) / 112 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( 81\beta_{2} + 4\beta _1 + 39012 ) / 112 \)
|
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 | −648.396 | 0 | 5824.83 | 0 | −16807.0 | 0 | 243270. | 0 | |||||||||||||||||||||||||||
| 1.2 | 0 | 163.189 | 0 | 648.744 | 0 | −16807.0 | 0 | −150516. | 0 | ||||||||||||||||||||||||||||
| 1.3 | 0 | 385.207 | 0 | −1711.58 | 0 | −16807.0 | 0 | −28762.9 | 0 | ||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(7\) | \(1\) |
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 | 28.12.a.a | ✓ | 3 |
| 3.b | odd | 2 | 1 | 252.12.a.f | 3 | ||
| 4.b | odd | 2 | 1 | 112.12.a.g | 3 | ||
| 7.b | odd | 2 | 1 | 196.12.a.c | 3 | ||
| 7.c | even | 3 | 2 | 196.12.e.e | 6 | ||
| 7.d | odd | 6 | 2 | 196.12.e.d | 6 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 28.12.a.a | ✓ | 3 | 1.a | even | 1 | 1 | trivial |
| 112.12.a.g | 3 | 4.b | odd | 2 | 1 | ||
| 196.12.a.c | 3 | 7.b | odd | 2 | 1 | ||
| 196.12.e.d | 6 | 7.d | odd | 6 | 2 | ||
| 196.12.e.e | 6 | 7.c | even | 3 | 2 | ||
| 252.12.a.f | 3 | 3.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{3} + 100T_{3}^{2} - 292716T_{3} + 40759200 \)
acting on \(S_{12}^{\mathrm{new}}(\Gamma_0(28))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{3} \)
|
| $3$ |
\( T^{3} + 100 T^{2} + \cdots + 40759200 \)
|
| $5$ |
\( T^{3} + \cdots + 6467756800 \)
|
| $7$ |
\( (T + 16807)^{3} \)
|
| $11$ |
\( T^{3} + \cdots + 29\!\cdots\!00 \)
|
| $13$ |
\( T^{3} + \cdots + 54\!\cdots\!44 \)
|
| $17$ |
\( T^{3} + \cdots - 42\!\cdots\!60 \)
|
| $19$ |
\( T^{3} + \cdots - 41\!\cdots\!52 \)
|
| $23$ |
\( T^{3} + \cdots - 88\!\cdots\!52 \)
|
| $29$ |
\( T^{3} + \cdots - 11\!\cdots\!12 \)
|
| $31$ |
\( T^{3} + \cdots + 98\!\cdots\!64 \)
|
| $37$ |
\( T^{3} + \cdots + 19\!\cdots\!80 \)
|
| $41$ |
\( T^{3} + \cdots - 44\!\cdots\!84 \)
|
| $43$ |
\( T^{3} + \cdots - 80\!\cdots\!20 \)
|
| $47$ |
\( T^{3} + \cdots + 93\!\cdots\!44 \)
|
| $53$ |
\( T^{3} + \cdots + 90\!\cdots\!00 \)
|
| $59$ |
\( T^{3} + \cdots + 26\!\cdots\!80 \)
|
| $61$ |
\( T^{3} + \cdots + 76\!\cdots\!00 \)
|
| $67$ |
\( T^{3} + \cdots - 31\!\cdots\!20 \)
|
| $71$ |
\( T^{3} + \cdots + 31\!\cdots\!00 \)
|
| $73$ |
\( T^{3} + \cdots - 66\!\cdots\!60 \)
|
| $79$ |
\( T^{3} + \cdots - 50\!\cdots\!96 \)
|
| $83$ |
\( T^{3} + \cdots + 30\!\cdots\!00 \)
|
| $89$ |
\( T^{3} + \cdots - 42\!\cdots\!20 \)
|
| $97$ |
\( T^{3} + \cdots + 44\!\cdots\!56 \)
|
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