Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [169,4,Mod(1,169)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(169, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("169.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 169 = 13^{2} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 169.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: | \(9.97132279097\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{17}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x - 4 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 13) |
| 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 \(\beta = \frac{1}{2}(1 + \sqrt{17})\). We also show the integral \(q\)-expansion of the trace form.
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 |
|
0.438447 | −3.68466 | −7.80776 | 17.8078 | −1.61553 | −5.43845 | −6.93087 | −13.4233 | 7.80776 | ||||||||||||||||||||||||
| 1.2 | 4.56155 | 8.68466 | 12.8078 | −2.80776 | 39.6155 | −9.56155 | 21.9309 | 48.4233 | −12.8078 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(13\) | \(1\) |
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 | 169.4.a.j | 2 | |
| 3.b | odd | 2 | 1 | 1521.4.a.l | 2 | ||
| 13.b | even | 2 | 1 | 169.4.a.f | 2 | ||
| 13.c | even | 3 | 2 | 169.4.c.f | 4 | ||
| 13.d | odd | 4 | 2 | 169.4.b.e | 4 | ||
| 13.e | even | 6 | 2 | 13.4.c.b | ✓ | 4 | |
| 13.f | odd | 12 | 4 | 169.4.e.g | 8 | ||
| 39.d | odd | 2 | 1 | 1521.4.a.t | 2 | ||
| 39.h | odd | 6 | 2 | 117.4.g.d | 4 | ||
| 52.i | odd | 6 | 2 | 208.4.i.e | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 13.4.c.b | ✓ | 4 | 13.e | even | 6 | 2 | |
| 117.4.g.d | 4 | 39.h | odd | 6 | 2 | ||
| 169.4.a.f | 2 | 13.b | even | 2 | 1 | ||
| 169.4.a.j | 2 | 1.a | even | 1 | 1 | trivial | |
| 169.4.b.e | 4 | 13.d | odd | 4 | 2 | ||
| 169.4.c.f | 4 | 13.c | even | 3 | 2 | ||
| 169.4.e.g | 8 | 13.f | odd | 12 | 4 | ||
| 208.4.i.e | 4 | 52.i | odd | 6 | 2 | ||
| 1521.4.a.l | 2 | 3.b | odd | 2 | 1 | ||
| 1521.4.a.t | 2 | 39.d | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{2} - 5T_{2} + 2 \)
acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(169))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} - 5T + 2 \)
|
| $3$ |
\( T^{2} - 5T - 32 \)
|
| $5$ |
\( T^{2} - 15T - 50 \)
|
| $7$ |
\( T^{2} + 15T + 52 \)
|
| $11$ |
\( T^{2} + 17T - 884 \)
|
| $13$ |
\( T^{2} \)
|
| $17$ |
\( T^{2} - 70T + 137 \)
|
| $19$ |
\( T^{2} - 141T + 4864 \)
|
| $23$ |
\( T^{2} - 145T + 628 \)
|
| $29$ |
\( T^{2} - 34T - 15011 \)
|
| $31$ |
\( T^{2} - 140T - 37600 \)
|
| $37$ |
\( T^{2} - 190T + 797 \)
|
| $41$ |
\( T^{2} + 538T + 70661 \)
|
| $43$ |
\( T^{2} - 455T + 11768 \)
|
| $47$ |
\( T^{2} + 60T - 82400 \)
|
| $53$ |
\( T^{2} - 545T - 41450 \)
|
| $59$ |
\( T^{2} - 809T + 150764 \)
|
| $61$ |
\( T^{2} - 502T - 106999 \)
|
| $67$ |
\( T^{2} - 475T + 21212 \)
|
| $71$ |
\( T^{2} + 127T - 42824 \)
|
| $73$ |
\( T^{2} + 585T + 54850 \)
|
| $79$ |
\( T^{2} - 240T + 7600 \)
|
| $83$ |
\( T^{2} + 260T - 25600 \)
|
| $89$ |
\( T^{2} + 921T + 145654 \)
|
| $97$ |
\( T^{2} - 415T - 891778 \)
|
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