Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [819,2,Mod(64,819)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(819, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 1]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("819.64");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 819 = 3^{2} \cdot 7 \cdot 13 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 819.c (of order \(2\), degree \(1\), 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: | \(6\) |
| Coefficient field: | 6.0.350464.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{6} - 2x^{5} + 2x^{4} + 2x^{3} + 4x^{2} - 4x + 2 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 2 \) |
| Twist minimal: | no (minimal twist has level 91) |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{2}]$ |
$q$-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 \(1,\beta_1,\ldots,\beta_{5}\) 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
\( x^{6} - 2x^{5} + 2x^{4} + 2x^{3} + 4x^{2} - 4x + 2 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( -\nu^{5} + 8\nu^{4} - 4\nu^{3} - \nu^{2} + 2\nu + 38 ) / 23 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -5\nu^{5} + 17\nu^{4} - 20\nu^{3} - 5\nu^{2} + 10\nu + 29 ) / 23 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( 7\nu^{5} - 10\nu^{4} + 5\nu^{3} + 30\nu^{2} + 32\nu - 13 ) / 23 \)
|
| \(\beta_{4}\) | \(=\) |
\( ( -11\nu^{5} + 19\nu^{4} - 21\nu^{3} - 11\nu^{2} - 70\nu + 27 ) / 23 \)
|
| \(\beta_{5}\) | \(=\) |
\( ( -14\nu^{5} + 20\nu^{4} - 10\nu^{3} - 37\nu^{2} - 64\nu + 26 ) / 23 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{5} - \beta_{4} + \beta_{3} + \beta_{2} - \beta _1 + 1 ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{5} + 2\beta_{3} \)
|
| \(\nu^{3}\) | \(=\) |
\( 2\beta_{5} - \beta_{4} + 2\beta_{3} - \beta_{2} + 2\beta _1 - 2 \)
|
| \(\nu^{4}\) | \(=\) |
\( -\beta_{2} + 5\beta _1 - 7 \)
|
| \(\nu^{5}\) | \(=\) |
\( -8\beta_{5} + 3\beta_{4} - 9\beta_{3} - 3\beta_{2} + 8\beta _1 - 9 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/819\mathbb{Z}\right)^\times\).
| \(n\) | \(92\) | \(379\) | \(703\) |
| \(\chi(n)\) | \(1\) | \(-1\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 64.1 |
|
− | 2.48119i | 0 | −4.15633 | 0.675131i | 0 | 1.00000i | 5.35026i | 0 | 1.67513 | |||||||||||||||||||||||||||||||||||
| 64.2 | − | 1.17009i | 0 | 0.630898 | 0.460811i | 0 | − | 1.00000i | − | 3.07838i | 0 | 0.539189 | ||||||||||||||||||||||||||||||||||
| 64.3 | − | 0.688892i | 0 | 1.52543 | − | 3.21432i | 0 | 1.00000i | − | 2.42864i | 0 | −2.21432 | ||||||||||||||||||||||||||||||||||
| 64.4 | 0.688892i | 0 | 1.52543 | 3.21432i | 0 | − | 1.00000i | 2.42864i | 0 | −2.21432 | ||||||||||||||||||||||||||||||||||||
| 64.5 | 1.17009i | 0 | 0.630898 | − | 0.460811i | 0 | 1.00000i | 3.07838i | 0 | 0.539189 | ||||||||||||||||||||||||||||||||||||
| 64.6 | 2.48119i | 0 | −4.15633 | − | 0.675131i | 0 | − | 1.00000i | − | 5.35026i | 0 | 1.67513 | ||||||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 13.b | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 819.2.c.b | 6 | |
| 3.b | odd | 2 | 1 | 91.2.c.a | ✓ | 6 | |
| 12.b | even | 2 | 1 | 1456.2.k.c | 6 | ||
| 13.b | even | 2 | 1 | inner | 819.2.c.b | 6 | |
| 21.c | even | 2 | 1 | 637.2.c.d | 6 | ||
| 21.g | even | 6 | 2 | 637.2.r.d | 12 | ||
| 21.h | odd | 6 | 2 | 637.2.r.e | 12 | ||
| 39.d | odd | 2 | 1 | 91.2.c.a | ✓ | 6 | |
| 39.f | even | 4 | 1 | 1183.2.a.h | 3 | ||
| 39.f | even | 4 | 1 | 1183.2.a.j | 3 | ||
| 156.h | even | 2 | 1 | 1456.2.k.c | 6 | ||
| 273.g | even | 2 | 1 | 637.2.c.d | 6 | ||
| 273.o | odd | 4 | 1 | 8281.2.a.be | 3 | ||
| 273.o | odd | 4 | 1 | 8281.2.a.bi | 3 | ||
| 273.w | odd | 6 | 2 | 637.2.r.e | 12 | ||
| 273.ba | even | 6 | 2 | 637.2.r.d | 12 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 91.2.c.a | ✓ | 6 | 3.b | odd | 2 | 1 | |
| 91.2.c.a | ✓ | 6 | 39.d | odd | 2 | 1 | |
| 637.2.c.d | 6 | 21.c | even | 2 | 1 | ||
| 637.2.c.d | 6 | 273.g | even | 2 | 1 | ||
| 637.2.r.d | 12 | 21.g | even | 6 | 2 | ||
| 637.2.r.d | 12 | 273.ba | even | 6 | 2 | ||
| 637.2.r.e | 12 | 21.h | odd | 6 | 2 | ||
| 637.2.r.e | 12 | 273.w | odd | 6 | 2 | ||
| 819.2.c.b | 6 | 1.a | even | 1 | 1 | trivial | |
| 819.2.c.b | 6 | 13.b | even | 2 | 1 | inner | |
| 1183.2.a.h | 3 | 39.f | even | 4 | 1 | ||
| 1183.2.a.j | 3 | 39.f | even | 4 | 1 | ||
| 1456.2.k.c | 6 | 12.b | even | 2 | 1 | ||
| 1456.2.k.c | 6 | 156.h | even | 2 | 1 | ||
| 8281.2.a.be | 3 | 273.o | odd | 4 | 1 | ||
| 8281.2.a.bi | 3 | 273.o | odd | 4 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{6} + 8T_{2}^{4} + 12T_{2}^{2} + 4 \)
acting on \(S_{2}^{\mathrm{new}}(819, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{6} + 8 T^{4} + \cdots + 4 \)
|
| $3$ |
\( T^{6} \)
|
| $5$ |
\( T^{6} + 11 T^{4} + \cdots + 1 \)
|
| $7$ |
\( (T^{2} + 1)^{3} \)
|
| $11$ |
\( T^{6} + 28 T^{4} + \cdots + 100 \)
|
| $13$ |
\( T^{6} - 8 T^{5} + \cdots + 2197 \)
|
| $17$ |
\( (T^{3} - 4 T^{2} - 8 T + 34)^{2} \)
|
| $19$ |
\( T^{6} + 119 T^{4} + \cdots + 37249 \)
|
| $23$ |
\( (T^{3} + 3 T^{2} - 25 T - 79)^{2} \)
|
| $29$ |
\( (T^{3} - 7 T^{2} - 21 T - 5)^{2} \)
|
| $31$ |
\( T^{6} + 83 T^{4} + \cdots + 4225 \)
|
| $37$ |
\( T^{6} + 108 T^{4} + \cdots + 2916 \)
|
| $41$ |
\( T^{6} + 108 T^{4} + \cdots + 1600 \)
|
| $43$ |
\( (T^{3} + 13 T^{2} + \cdots - 17)^{2} \)
|
| $47$ |
\( T^{6} + 151 T^{4} + \cdots + 18769 \)
|
| $53$ |
\( (T^{3} + T^{2} - 9 T - 13)^{2} \)
|
| $59$ |
\( T^{6} + 68 T^{4} + \cdots + 2704 \)
|
| $61$ |
\( (T^{3} - 14 T^{2} + \cdots + 152)^{2} \)
|
| $67$ |
\( T^{6} + 80 T^{4} + \cdots + 256 \)
|
| $71$ |
\( T^{6} + 304 T^{4} + \cdots + 792100 \)
|
| $73$ |
\( T^{6} + 263 T^{4} + \cdots + 961 \)
|
| $79$ |
\( (T^{3} - 13 T^{2} + \cdots + 185)^{2} \)
|
| $83$ |
\( T^{6} + 227 T^{4} + \cdots + 26569 \)
|
| $89$ |
\( T^{6} + 119 T^{4} + \cdots + 51529 \)
|
| $97$ |
\( T^{6} + 575 T^{4} + \cdots + 4765489 \)
|
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