Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1850,2,Mod(1,1850)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1850, 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("1850.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1850 = 2 \cdot 5^{2} \cdot 37 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1850.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: | \(14.7723243739\) |
| Analytic rank: | \(0\) |
| Dimension: | \(5\) |
| Coefficient field: | 5.5.1791440.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{5} - 9x^{3} + 13x - 4 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 370) |
| 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
\( x^{5} - 9x^{3} + 13x - 4 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} - 4 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( \nu^{4} - \nu^{3} - 8\nu^{2} + 5\nu + 8 ) / 3 \)
|
| \(\beta_{4}\) | \(=\) |
\( ( 2\nu^{4} + \nu^{3} - 16\nu^{2} - 8\nu + 13 ) / 3 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{2} + 4 \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{4} - 2\beta_{3} + 6\beta _1 + 1 \)
|
| \(\nu^{4}\) | \(=\) |
\( \beta_{4} + \beta_{3} + 8\beta_{2} + \beta _1 + 25 \)
|
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 |
|
−1.00000 | −2.62545 | 1.00000 | 0 | 2.62545 | 1.83227 | −1.00000 | 3.89300 | 0 | |||||||||||||||||||||||||||||||||
| 1.2 | −1.00000 | −1.53175 | 1.00000 | 0 | 1.53175 | −4.67211 | −1.00000 | −0.653743 | 0 | ||||||||||||||||||||||||||||||||||
| 1.3 | −1.00000 | 0.332924 | 1.00000 | 0 | −0.332924 | −3.51336 | −1.00000 | −2.88916 | 0 | ||||||||||||||||||||||||||||||||||
| 1.4 | −1.00000 | 1.09441 | 1.00000 | 0 | −1.09441 | 3.20984 | −1.00000 | −1.80226 | 0 | ||||||||||||||||||||||||||||||||||
| 1.5 | −1.00000 | 2.72987 | 1.00000 | 0 | −2.72987 | 4.14336 | −1.00000 | 4.45216 | 0 | ||||||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(1\) |
| \(5\) | \(-1\) |
| \(37\) | \(1\) |
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 | 1850.2.a.bd | 5 | |
| 5.b | even | 2 | 1 | 1850.2.a.be | 5 | ||
| 5.c | odd | 4 | 2 | 370.2.b.d | ✓ | 10 | |
| 15.e | even | 4 | 2 | 3330.2.d.p | 10 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 370.2.b.d | ✓ | 10 | 5.c | odd | 4 | 2 | |
| 1850.2.a.bd | 5 | 1.a | even | 1 | 1 | trivial | |
| 1850.2.a.be | 5 | 5.b | even | 2 | 1 | ||
| 3330.2.d.p | 10 | 15.e | even | 4 | 2 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(1850))\):
|
\( T_{3}^{5} - 9T_{3}^{3} + 13T_{3} - 4 \)
|
|
\( T_{7}^{5} - T_{7}^{4} - 32T_{7}^{3} + 44T_{7}^{2} + 240T_{7} - 400 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T + 1)^{5} \)
|
| $3$ |
\( T^{5} - 9 T^{3} + \cdots - 4 \)
|
| $5$ |
\( T^{5} \)
|
| $7$ |
\( T^{5} - T^{4} + \cdots - 400 \)
|
| $11$ |
\( T^{5} - 3 T^{4} + \cdots - 1 \)
|
| $13$ |
\( T^{5} - 6 T^{4} + \cdots - 8 \)
|
| $17$ |
\( T^{5} + 9 T^{4} + \cdots - 368 \)
|
| $19$ |
\( T^{5} - 4 T^{4} + \cdots - 640 \)
|
| $23$ |
\( T^{5} + 6 T^{4} + \cdots - 288 \)
|
| $29$ |
\( T^{5} - 11 T^{4} + \cdots - 335 \)
|
| $31$ |
\( T^{5} - 23 T^{4} + \cdots - 10511 \)
|
| $37$ |
\( (T + 1)^{5} \)
|
| $41$ |
\( T^{5} + 7 T^{4} + \cdots + 5821 \)
|
| $43$ |
\( T^{5} - 17 T^{4} + \cdots + 3056 \)
|
| $47$ |
\( T^{5} + 12 T^{4} + \cdots + 8000 \)
|
| $53$ |
\( T^{5} - 7 T^{4} + \cdots - 32816 \)
|
| $59$ |
\( T^{5} - 20 T^{4} + \cdots - 3136 \)
|
| $61$ |
\( T^{5} + 9 T^{4} + \cdots - 2323 \)
|
| $67$ |
\( T^{5} + 12 T^{4} + \cdots - 392 \)
|
| $71$ |
\( T^{5} - 6 T^{4} + \cdots - 13792 \)
|
| $73$ |
\( T^{5} - 6 T^{4} + \cdots - 14726 \)
|
| $79$ |
\( T^{5} - 20 T^{4} + \cdots - 8168 \)
|
| $83$ |
\( T^{5} + 12 T^{4} + \cdots - 2752 \)
|
| $89$ |
\( T^{5} - 12 T^{4} + \cdots - 55552 \)
|
| $97$ |
\( T^{5} + 3 T^{4} + \cdots + 1008 \)
|
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