Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [2645,2,Mod(1,2645)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(2645, 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("2645.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 2645 = 5 \cdot 23^{2} \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 2645.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: | \(21.1204313346\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | 4.4.65057.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} - 8x^{2} + 5x + 12 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| Coefficient ring index: | \( 1 \) |
| 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 \(1,\beta_1,\beta_2,\beta_3\) 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
\( x^{4} - x^{3} - 8x^{2} + 5x + 12 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} - 4 \)
|
| \(\beta_{3}\) | \(=\) |
\( \nu^{3} - 5\nu - 1 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{2} + 4 \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{3} + 5\beta _1 + 1 \)
|
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.1 |
|
−2.66372 | −3.09542 | 5.09542 | −1.00000 | 8.24533 | −0.663723 | −8.24533 | 6.58161 | 2.66372 | ||||||||||||||||||||||||||||||
| 1.2 | −1.77539 | 0.847993 | 1.15201 | −1.00000 | −1.50552 | 0.224611 | 1.50552 | −2.28091 | 1.77539 | |||||||||||||||||||||||||||||||
| 1.3 | 1.07193 | 2.85096 | −0.850960 | −1.00000 | 3.05604 | 3.07193 | −3.05604 | 5.12797 | −1.07193 | |||||||||||||||||||||||||||||||
| 1.4 | 2.36718 | −1.60354 | 3.60354 | −1.00000 | −3.79585 | 4.36718 | 3.79585 | −0.428675 | −2.36718 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(5\) | \(1\) |
| \(23\) | \(-1\) |
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 | 2645.2.a.i | ✓ | 4 |
| 23.b | odd | 2 | 1 | 2645.2.a.j | yes | 4 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 2645.2.a.i | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 2645.2.a.j | yes | 4 | 23.b | odd | 2 | 1 | |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(2645))\):
|
\( T_{2}^{4} + T_{2}^{3} - 8T_{2}^{2} - 5T_{2} + 12 \)
|
|
\( T_{7}^{4} - 7T_{7}^{3} + 10T_{7}^{2} + 7T_{7} - 2 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} + T^{3} + \cdots + 12 \)
|
| $3$ |
\( T^{4} + T^{3} + \cdots + 12 \)
|
| $5$ |
\( (T + 1)^{4} \)
|
| $7$ |
\( T^{4} - 7 T^{3} + \cdots - 2 \)
|
| $11$ |
\( T^{4} - 3 T^{3} + \cdots + 291 \)
|
| $13$ |
\( T^{4} - 4 T^{3} + \cdots + 22 \)
|
| $17$ |
\( T^{4} - 5 T^{3} + \cdots + 162 \)
|
| $19$ |
\( T^{4} - 8 T^{3} + \cdots - 67 \)
|
| $23$ |
\( T^{4} \)
|
| $29$ |
\( T^{4} - 3 T^{3} + \cdots - 6 \)
|
| $31$ |
\( T^{4} + 5 T^{3} + \cdots + 1 \)
|
| $37$ |
\( T^{4} - 13 T^{3} + \cdots - 1296 \)
|
| $41$ |
\( T^{4} + 8 T^{3} + \cdots - 3 \)
|
| $43$ |
\( T^{4} - 20 T^{3} + \cdots - 3564 \)
|
| $47$ |
\( T^{4} + 11 T^{3} + \cdots - 54 \)
|
| $53$ |
\( T^{4} - 5 T^{3} + \cdots + 108 \)
|
| $59$ |
\( T^{4} + 4 T^{3} + \cdots + 216 \)
|
| $61$ |
\( T^{4} + 16 T^{3} + \cdots - 503 \)
|
| $67$ |
\( T^{4} - 34 T^{3} + \cdots + 1602 \)
|
| $71$ |
\( T^{4} + 6 T^{3} + \cdots + 16683 \)
|
| $73$ |
\( T^{4} + 19 T^{3} + \cdots - 5238 \)
|
| $79$ |
\( T^{4} - 24 T^{3} + \cdots - 603 \)
|
| $83$ |
\( T^{4} + 10 T^{3} + \cdots + 108 \)
|
| $89$ |
\( T^{4} + 19 T^{3} + \cdots - 3558 \)
|
| $97$ |
\( T^{4} + 17 T^{3} + \cdots + 184 \)
|
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