Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [927,2,Mod(1,927)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(927, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([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("927.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 927 = 3^{2} \cdot 103 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 927.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: | \(7.40213226737\) |
| Analytic rank: | \(0\) |
| Dimension: | \(5\) |
| Coefficient field: | 5.5.81509.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{5} - x^{4} - 5x^{3} + 3x^{2} + 5x - 2 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 309) |
| 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 \(1,\beta_1,\beta_2,\beta_3,\beta_4\) 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
\( x^{5} - x^{4} - 5x^{3} + 3x^{2} + 5x - 2 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} - 2 \)
|
| \(\beta_{3}\) | \(=\) |
\( \nu^{3} - \nu^{2} - 3\nu + 1 \)
|
| \(\beta_{4}\) | \(=\) |
\( \nu^{4} - \nu^{3} - 4\nu^{2} + 2\nu + 2 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{2} + 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{3} + \beta_{2} + 3\beta _1 + 1 \)
|
| \(\nu^{4}\) | \(=\) |
\( \beta_{4} + \beta_{3} + 5\beta_{2} + \beta _1 + 7 \)
|
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 |
|
−1.63526 | 0 | 0.674085 | 3.75265 | 0 | −2.88979 | 2.16822 | 0 | −6.13657 | |||||||||||||||||||||||||||||||||
| 1.2 | −0.721159 | 0 | −1.47993 | 1.11830 | 0 | 2.30134 | 2.50958 | 0 | −0.806475 | ||||||||||||||||||||||||||||||||||
| 1.3 | 0.199126 | 0 | −1.96035 | −3.39280 | 0 | −4.89666 | −0.788610 | 0 | −0.675596 | ||||||||||||||||||||||||||||||||||
| 1.4 | 1.82901 | 0 | 1.34527 | 3.16702 | 0 | 4.41676 | −1.19750 | 0 | 5.79251 | ||||||||||||||||||||||||||||||||||
| 1.5 | 2.32829 | 0 | 3.42092 | 0.354824 | 0 | −0.931655 | 3.30831 | 0 | 0.826132 | ||||||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(3\) | \(-1\) |
| \(103\) | \(1\) |
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 | 927.2.a.e | 5 | |
| 3.b | odd | 2 | 1 | 309.2.a.c | ✓ | 5 | |
| 12.b | even | 2 | 1 | 4944.2.a.bb | 5 | ||
| 15.d | odd | 2 | 1 | 7725.2.a.t | 5 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 309.2.a.c | ✓ | 5 | 3.b | odd | 2 | 1 | |
| 927.2.a.e | 5 | 1.a | even | 1 | 1 | trivial | |
| 4944.2.a.bb | 5 | 12.b | even | 2 | 1 | ||
| 7725.2.a.t | 5 | 15.d | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{5} - 2T_{2}^{4} - 4T_{2}^{3} + 6T_{2}^{2} + 4T_{2} - 1 \)
acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(927))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{5} - 2 T^{4} + \cdots - 1 \)
|
| $3$ |
\( T^{5} \)
|
| $5$ |
\( T^{5} - 5 T^{4} + \cdots + 16 \)
|
| $7$ |
\( T^{5} + 2 T^{4} + \cdots + 134 \)
|
| $11$ |
\( T^{5} - 12 T^{4} + \cdots - 32 \)
|
| $13$ |
\( T^{5} - T^{4} - 51 T^{3} + \cdots + 9 \)
|
| $17$ |
\( T^{5} - 10 T^{4} + \cdots - 1216 \)
|
| $19$ |
\( T^{5} + 16 T^{4} + \cdots + 4 \)
|
| $23$ |
\( T^{5} - 5 T^{4} + \cdots + 211 \)
|
| $29$ |
\( T^{5} - 16 T^{4} + \cdots + 194 \)
|
| $31$ |
\( T^{5} + 13 T^{4} + \cdots - 144 \)
|
| $37$ |
\( T^{5} - 4 T^{4} + \cdots - 4896 \)
|
| $41$ |
\( T^{5} - 20 T^{4} + \cdots + 1172 \)
|
| $43$ |
\( T^{5} - 7 T^{4} + \cdots - 12976 \)
|
| $47$ |
\( T^{5} + 8 T^{4} + \cdots - 32 \)
|
| $53$ |
\( T^{5} - 8 T^{4} + \cdots - 2144 \)
|
| $59$ |
\( T^{5} - 19 T^{4} + \cdots + 5587 \)
|
| $61$ |
\( T^{5} + 19 T^{4} + \cdots + 1017 \)
|
| $67$ |
\( T^{5} - 11 T^{4} + \cdots + 3088 \)
|
| $71$ |
\( T^{5} - 10 T^{4} + \cdots + 5312 \)
|
| $73$ |
\( T^{5} - 20 T^{4} + \cdots - 9216 \)
|
| $79$ |
\( T^{5} + 14 T^{4} + \cdots + 12938 \)
|
| $83$ |
\( T^{5} - 11 T^{4} + \cdots - 3121 \)
|
| $89$ |
\( T^{5} + 22 T^{4} + \cdots - 51552 \)
|
| $97$ |
\( T^{5} - 7 T^{4} + \cdots - 13473 \)
|
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