Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [164,2,Mod(1,164)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(164, 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("164.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 164 = 2^{2} \cdot 41 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 164.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: | \(1.30954659315\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | 4.4.25808.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - 10x^{2} - 6x + 9 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| 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
\( x^{4} - 10x^{2} - 6x + 9 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( \nu^{3} - 7\nu - 3 ) / 3 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( -\nu^{3} + 3\nu^{2} + 7\nu - 12 ) / 3 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{3} + \beta_{2} + 5 \)
|
| \(\nu^{3}\) | \(=\) |
\( 3\beta_{2} + 7\beta _1 + 3 \)
|
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 | −3.24028 | 0 | 2.56613 | 0 | −0.858626 | 0 | 7.49944 | 0 | ||||||||||||||||||||||||||||||
| 1.2 | 0 | 0.0950939 | 0 | 1.17025 | 0 | 3.14501 | 0 | −2.99096 | 0 | |||||||||||||||||||||||||||||||
| 1.3 | 0 | 2.21551 | 0 | 3.59669 | 0 | −5.06479 | 0 | 1.90849 | 0 | |||||||||||||||||||||||||||||||
| 1.4 | 0 | 2.92968 | 0 | −3.33307 | 0 | 2.77840 | 0 | 5.58303 | 0 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(41\) | \(1\) |
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 | 164.2.a.a | ✓ | 4 |
| 3.b | odd | 2 | 1 | 1476.2.a.g | 4 | ||
| 4.b | odd | 2 | 1 | 656.2.a.i | 4 | ||
| 5.b | even | 2 | 1 | 4100.2.a.c | 4 | ||
| 5.c | odd | 4 | 2 | 4100.2.d.c | 8 | ||
| 7.b | odd | 2 | 1 | 8036.2.a.i | 4 | ||
| 8.b | even | 2 | 1 | 2624.2.a.v | 4 | ||
| 8.d | odd | 2 | 1 | 2624.2.a.y | 4 | ||
| 12.b | even | 2 | 1 | 5904.2.a.bp | 4 | ||
| 41.b | even | 2 | 1 | 6724.2.a.c | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 164.2.a.a | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 656.2.a.i | 4 | 4.b | odd | 2 | 1 | ||
| 1476.2.a.g | 4 | 3.b | odd | 2 | 1 | ||
| 2624.2.a.v | 4 | 8.b | even | 2 | 1 | ||
| 2624.2.a.y | 4 | 8.d | odd | 2 | 1 | ||
| 4100.2.a.c | 4 | 5.b | even | 2 | 1 | ||
| 4100.2.d.c | 8 | 5.c | odd | 4 | 2 | ||
| 5904.2.a.bp | 4 | 12.b | even | 2 | 1 | ||
| 6724.2.a.c | 4 | 41.b | even | 2 | 1 | ||
| 8036.2.a.i | 4 | 7.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace is the entire newspace \(S_{2}^{\mathrm{new}}(\Gamma_0(164))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} - 2 T^{3} + \cdots - 2 \)
|
| $5$ |
\( T^{4} - 4 T^{3} + \cdots - 36 \)
|
| $7$ |
\( T^{4} - 22 T^{2} + \cdots + 38 \)
|
| $11$ |
\( T^{4} - 4 T^{3} + \cdots + 54 \)
|
| $13$ |
\( T^{4} - 40 T^{2} + \cdots + 144 \)
|
| $17$ |
\( T^{4} + 4 T^{3} + \cdots + 432 \)
|
| $19$ |
\( T^{4} - 6 T^{3} + \cdots - 186 \)
|
| $23$ |
\( T^{4} + 12 T^{3} + \cdots - 192 \)
|
| $29$ |
\( T^{4} + 4 T^{3} + \cdots + 144 \)
|
| $31$ |
\( T^{4} + 8 T^{3} + \cdots + 64 \)
|
| $37$ |
\( T^{4} - 16 T^{3} + \cdots - 324 \)
|
| $41$ |
\( (T + 1)^{4} \)
|
| $43$ |
\( T^{4} - 4 T^{3} + \cdots - 288 \)
|
| $47$ |
\( T^{4} + 6 T^{3} + \cdots + 1182 \)
|
| $53$ |
\( T^{4} + 16 T^{3} + \cdots - 1296 \)
|
| $59$ |
\( T^{4} - 12 T^{3} + \cdots - 192 \)
|
| $61$ |
\( T^{4} - 24 T^{3} + \cdots + 288 \)
|
| $67$ |
\( T^{4} - 28 T^{3} + \cdots + 1094 \)
|
| $71$ |
\( T^{4} + 2 T^{3} + \cdots - 426 \)
|
| $73$ |
\( T^{4} - 8 T^{3} + \cdots - 404 \)
|
| $79$ |
\( T^{4} + 18 T^{3} + \cdots - 18 \)
|
| $83$ |
\( T^{4} + 12 T^{3} + \cdots - 3456 \)
|
| $89$ |
\( T^{4} - 4 T^{3} + \cdots + 4272 \)
|
| $97$ |
\( T^{4} - 16 T^{3} + \cdots + 4944 \)
|
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