Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1840,4,Mod(1,1840)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1840, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 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("1840.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1840 = 2^{4} \cdot 5 \cdot 23 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1840.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: | \(108.563514411\) |
| Analytic rank: | \(1\) |
| Dimension: | \(5\) |
| Coefficient field: | \(\mathbb{Q}[x]/(x^{5} - \cdots)\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{5} - 34x^{3} - 9x^{2} + 260x + 60 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 2^{3} \) |
| Twist minimal: | no (minimal twist has level 115) |
| 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
\( x^{5} - 34x^{3} - 9x^{2} + 260x + 60 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( 3\nu^{4} - 22\nu^{3} - 26\nu^{2} + 377\nu - 278 ) / 64 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( \nu^{4} - 2\nu^{3} - 30\nu^{2} + 51\nu + 158 ) / 16 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( -\nu^{4} + 2\nu^{3} + 30\nu^{2} - 19\nu - 158 ) / 16 \)
|
| \(\beta_{4}\) | \(=\) |
\( ( 7\nu^{4} + 2\nu^{3} - 146\nu^{2} - 123\nu + 194 ) / 32 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{3} + \beta_{2} ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{4} + 4\beta_{3} - \beta_{2} + 2\beta _1 + 52 ) / 4 \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{4} + 11\beta_{3} + 9\beta_{2} - 2\beta _1 + 5 \)
|
| \(\nu^{4}\) | \(=\) |
\( ( 19\beta_{4} + 53\beta_{3} + 2\beta_{2} + 22\beta _1 + 484 ) / 2 \)
|
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 | −8.28008 | 0 | −5.00000 | 0 | 30.9947 | 0 | 41.5597 | 0 | |||||||||||||||||||||||||||||||||
| 1.2 | 0 | −2.78435 | 0 | −5.00000 | 0 | −24.1991 | 0 | −19.2474 | 0 | ||||||||||||||||||||||||||||||||||
| 1.3 | 0 | 0.577397 | 0 | −5.00000 | 0 | 10.7178 | 0 | −26.6666 | 0 | ||||||||||||||||||||||||||||||||||
| 1.4 | 0 | 7.39409 | 0 | −5.00000 | 0 | 3.57544 | 0 | 27.6726 | 0 | ||||||||||||||||||||||||||||||||||
| 1.5 | 0 | 9.09294 | 0 | −5.00000 | 0 | −6.08885 | 0 | 55.6816 | 0 | ||||||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(5\) | \(1\) |
| \(23\) | \(1\) |
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 | 1840.4.a.p | 5 | |
| 4.b | odd | 2 | 1 | 115.4.a.d | ✓ | 5 | |
| 12.b | even | 2 | 1 | 1035.4.a.m | 5 | ||
| 20.d | odd | 2 | 1 | 575.4.a.k | 5 | ||
| 20.e | even | 4 | 2 | 575.4.b.h | 10 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 115.4.a.d | ✓ | 5 | 4.b | odd | 2 | 1 | |
| 575.4.a.k | 5 | 20.d | odd | 2 | 1 | ||
| 575.4.b.h | 10 | 20.e | even | 4 | 2 | ||
| 1035.4.a.m | 5 | 12.b | even | 2 | 1 | ||
| 1840.4.a.p | 5 | 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 \(S_{4}^{\mathrm{new}}(\Gamma_0(1840))\):
|
\( T_{3}^{5} - 6T_{3}^{4} - 89T_{3}^{3} + 417T_{3}^{2} + 1340T_{3} - 895 \)
|
|
\( T_{7}^{5} - 15T_{7}^{4} - 743T_{7}^{3} + 6718T_{7}^{2} + 34948T_{7} - 175008 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{5} \)
|
| $3$ |
\( T^{5} - 6 T^{4} + \cdots - 895 \)
|
| $5$ |
\( (T + 5)^{5} \)
|
| $7$ |
\( T^{5} - 15 T^{4} + \cdots - 175008 \)
|
| $11$ |
\( T^{5} - 153 T^{4} + \cdots + 58105432 \)
|
| $13$ |
\( T^{5} - 28 T^{4} + \cdots - 42528287 \)
|
| $17$ |
\( T^{5} + \cdots - 1269566848 \)
|
| $19$ |
\( T^{5} + 3 T^{4} + \cdots + 5566328 \)
|
| $23$ |
\( (T + 23)^{5} \)
|
| $29$ |
\( T^{5} + \cdots - 63213004636 \)
|
| $31$ |
\( T^{5} + \cdots - 341100199935 \)
|
| $37$ |
\( T^{5} + \cdots + 337199293312 \)
|
| $41$ |
\( T^{5} + \cdots - 554461833173 \)
|
| $43$ |
\( T^{5} + \cdots - 278531891200 \)
|
| $47$ |
\( T^{5} + \cdots - 6082562728660 \)
|
| $53$ |
\( T^{5} + \cdots - 1069522603168 \)
|
| $59$ |
\( T^{5} + \cdots + 446741827072 \)
|
| $61$ |
\( T^{5} + \cdots + 53636443112 \)
|
| $67$ |
\( T^{5} + \cdots + 19766839800960 \)
|
| $71$ |
\( T^{5} + \cdots - 256345940645 \)
|
| $73$ |
\( T^{5} + \cdots + 3947399121116 \)
|
| $79$ |
\( T^{5} + \cdots + 22913376438144 \)
|
| $83$ |
\( T^{5} + \cdots - 2501024408832 \)
|
| $89$ |
\( T^{5} + \cdots + 279901843479552 \)
|
| $97$ |
\( T^{5} + \cdots - 113500838416 \)
|
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