Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [819,2,Mod(235,819)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(819, base_ring=CyclotomicField(6))
chi = DirichletCharacter(H, H._module([0, 4, 0]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("819.235");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 819 = 3^{2} \cdot 7 \cdot 13 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 819.j (of order \(3\), degree \(2\), minimal) |
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: | no |
| Analytic conductor: | \(6.53974792554\) |
| Analytic rank: | \(0\) |
| Dimension: | \(6\) |
| Relative dimension: | \(3\) over \(\Q(\zeta_{3})\) |
| Coefficient field: | 6.0.64827.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{6} - x^{5} + 3x^{4} + 5x^{2} - 2x + 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{4}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 273) |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{3}]$ |
$q$-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 \(1,\beta_1,\ldots,\beta_{5}\) 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
\( x^{6} - x^{5} + 3x^{4} + 5x^{2} - 2x + 1 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -\nu^{5} + 3\nu^{4} - 9\nu^{3} + 5\nu^{2} - 2\nu + 6 ) / 13 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( -3\nu^{5} + 9\nu^{4} - 14\nu^{3} + 15\nu^{2} - 6\nu + 18 ) / 13 \)
|
| \(\beta_{4}\) | \(=\) |
\( ( -4\nu^{5} - \nu^{4} - 10\nu^{3} - 6\nu^{2} - 34\nu - 2 ) / 13 \)
|
| \(\beta_{5}\) | \(=\) |
\( ( -6\nu^{5} + 5\nu^{4} - 15\nu^{3} - 9\nu^{2} - 25\nu + 10 ) / 13 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( -\beta_{5} + \beta_{4} + \beta_{3} - \beta_{2} + \beta_1 \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{3} - 3\beta_{2} \)
|
| \(\nu^{4}\) | \(=\) |
\( 2\beta_{5} - 3\beta_{4} - 4\beta _1 - 2 \)
|
| \(\nu^{5}\) | \(=\) |
\( \beta_{5} - 4\beta_{4} - 4\beta_{3} + 9\beta_{2} - 9\beta_1 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/819\mathbb{Z}\right)^\times\).
| \(n\) | \(92\) | \(379\) | \(703\) |
| \(\chi(n)\) | \(1\) | \(1\) | \(-1 + \beta_{5}\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 235.1 |
|
−1.12349 | − | 1.94594i | 0 | −1.52446 | + | 2.64044i | 0.178448 | + | 0.309081i | 0 | −2.37047 | + | 1.17511i | 2.35690 | 0 | 0.400969 | − | 0.694498i | ||||||||||||||||||||||||||
| 235.2 | −0.277479 | − | 0.480608i | 0 | 0.846011 | − | 1.46533i | −2.02446 | − | 3.50647i | 0 | 0.167563 | − | 2.64044i | −2.04892 | 0 | −1.12349 | + | 1.94594i | |||||||||||||||||||||||||||
| 235.3 | 0.400969 | + | 0.694498i | 0 | 0.678448 | − | 1.17511i | 0.346011 | + | 0.599308i | 0 | 2.20291 | + | 1.46533i | 2.69202 | 0 | −0.277479 | + | 0.480608i | |||||||||||||||||||||||||||
| 352.1 | −1.12349 | + | 1.94594i | 0 | −1.52446 | − | 2.64044i | 0.178448 | − | 0.309081i | 0 | −2.37047 | − | 1.17511i | 2.35690 | 0 | 0.400969 | + | 0.694498i | |||||||||||||||||||||||||||
| 352.2 | −0.277479 | + | 0.480608i | 0 | 0.846011 | + | 1.46533i | −2.02446 | + | 3.50647i | 0 | 0.167563 | + | 2.64044i | −2.04892 | 0 | −1.12349 | − | 1.94594i | |||||||||||||||||||||||||||
| 352.3 | 0.400969 | − | 0.694498i | 0 | 0.678448 | + | 1.17511i | 0.346011 | − | 0.599308i | 0 | 2.20291 | − | 1.46533i | 2.69202 | 0 | −0.277479 | − | 0.480608i | |||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 7.c | even | 3 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 819.2.j.d | 6 | |
| 3.b | odd | 2 | 1 | 273.2.i.c | ✓ | 6 | |
| 7.c | even | 3 | 1 | inner | 819.2.j.d | 6 | |
| 7.c | even | 3 | 1 | 5733.2.a.bb | 3 | ||
| 7.d | odd | 6 | 1 | 5733.2.a.ba | 3 | ||
| 21.g | even | 6 | 1 | 1911.2.a.l | 3 | ||
| 21.h | odd | 6 | 1 | 273.2.i.c | ✓ | 6 | |
| 21.h | odd | 6 | 1 | 1911.2.a.m | 3 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 273.2.i.c | ✓ | 6 | 3.b | odd | 2 | 1 | |
| 273.2.i.c | ✓ | 6 | 21.h | odd | 6 | 1 | |
| 819.2.j.d | 6 | 1.a | even | 1 | 1 | trivial | |
| 819.2.j.d | 6 | 7.c | even | 3 | 1 | inner | |
| 1911.2.a.l | 3 | 21.g | even | 6 | 1 | ||
| 1911.2.a.m | 3 | 21.h | odd | 6 | 1 | ||
| 5733.2.a.ba | 3 | 7.d | odd | 6 | 1 | ||
| 5733.2.a.bb | 3 | 7.c | even | 3 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{6} + 2T_{2}^{5} + 5T_{2}^{4} + 3T_{2}^{2} + T_{2} + 1 \)
acting on \(S_{2}^{\mathrm{new}}(819, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{6} + 2 T^{5} + \cdots + 1 \)
|
| $3$ |
\( T^{6} \)
|
| $5$ |
\( T^{6} + 3 T^{5} + \cdots + 1 \)
|
| $7$ |
\( T^{6} + 7T^{3} + 343 \)
|
| $11$ |
\( T^{6} - T^{5} + \cdots + 1849 \)
|
| $13$ |
\( (T - 1)^{6} \)
|
| $17$ |
\( T^{6} + 5 T^{5} + \cdots + 169 \)
|
| $19$ |
\( T^{6} - 13 T^{5} + \cdots + 1849 \)
|
| $23$ |
\( T^{6} - 6 T^{5} + \cdots + 169 \)
|
| $29$ |
\( (T^{3} + 4 T^{2} + 3 T - 1)^{2} \)
|
| $31$ |
\( T^{6} - 20 T^{5} + \cdots + 78961 \)
|
| $37$ |
\( T^{6} - 19 T^{5} + \cdots + 16129 \)
|
| $41$ |
\( (T^{3} - 22 T^{2} + \cdots - 377)^{2} \)
|
| $43$ |
\( (T^{3} + 14 T^{2} + \cdots - 91)^{2} \)
|
| $47$ |
\( T^{6} - 2 T^{5} + \cdots + 53824 \)
|
| $53$ |
\( T^{6} - 5 T^{5} + \cdots + 15625 \)
|
| $59$ |
\( T^{6} - 7 T^{5} + \cdots + 41209 \)
|
| $61$ |
\( T^{6} - 5 T^{5} + \cdots + 1849 \)
|
| $67$ |
\( T^{6} - 9 T^{5} + \cdots + 1885129 \)
|
| $71$ |
\( (T^{3} - 9 T^{2} - 22 T + 71)^{2} \)
|
| $73$ |
\( T^{6} - 12 T^{5} + \cdots + 27889 \)
|
| $79$ |
\( T^{6} + 12 T^{5} + \cdots + 729 \)
|
| $83$ |
\( (T^{3} + 4 T^{2} + 3 T - 1)^{2} \)
|
| $89$ |
\( T^{6} + 29 T^{5} + \cdots + 1164241 \)
|
| $97$ |
\( (T^{3} + 7 T^{2} - 84 T - 7)^{2} \)
|
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