Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [27,4,Mod(1,27)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(27, 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("27.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 27 = 3^{3} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 27.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: | \(1.59305157015\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{2}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - 2 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| Coefficient ring index: | \( 3 \) |
| 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 \(\beta = 3\sqrt{2}\). 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 |
|
−4.24264 | 0 | 10.0000 | 16.9706 | 0 | 11.0000 | −8.48528 | 0 | −72.0000 | ||||||||||||||||||||||||
| 1.2 | 4.24264 | 0 | 10.0000 | −16.9706 | 0 | 11.0000 | 8.48528 | 0 | −72.0000 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(3\) | \( +1 \) |
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 3.b | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 27.4.a.c | ✓ | 2 |
| 3.b | odd | 2 | 1 | inner | 27.4.a.c | ✓ | 2 |
| 4.b | odd | 2 | 1 | 432.4.a.q | 2 | ||
| 5.b | even | 2 | 1 | 675.4.a.n | 2 | ||
| 5.c | odd | 4 | 2 | 675.4.b.i | 4 | ||
| 7.b | odd | 2 | 1 | 1323.4.a.t | 2 | ||
| 8.b | even | 2 | 1 | 1728.4.a.bp | 2 | ||
| 8.d | odd | 2 | 1 | 1728.4.a.bk | 2 | ||
| 9.c | even | 3 | 2 | 81.4.c.e | 4 | ||
| 9.d | odd | 6 | 2 | 81.4.c.e | 4 | ||
| 12.b | even | 2 | 1 | 432.4.a.q | 2 | ||
| 15.d | odd | 2 | 1 | 675.4.a.n | 2 | ||
| 15.e | even | 4 | 2 | 675.4.b.i | 4 | ||
| 21.c | even | 2 | 1 | 1323.4.a.t | 2 | ||
| 24.f | even | 2 | 1 | 1728.4.a.bk | 2 | ||
| 24.h | odd | 2 | 1 | 1728.4.a.bp | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 27.4.a.c | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 27.4.a.c | ✓ | 2 | 3.b | odd | 2 | 1 | inner |
| 81.4.c.e | 4 | 9.c | even | 3 | 2 | ||
| 81.4.c.e | 4 | 9.d | odd | 6 | 2 | ||
| 432.4.a.q | 2 | 4.b | odd | 2 | 1 | ||
| 432.4.a.q | 2 | 12.b | even | 2 | 1 | ||
| 675.4.a.n | 2 | 5.b | even | 2 | 1 | ||
| 675.4.a.n | 2 | 15.d | odd | 2 | 1 | ||
| 675.4.b.i | 4 | 5.c | odd | 4 | 2 | ||
| 675.4.b.i | 4 | 15.e | even | 4 | 2 | ||
| 1323.4.a.t | 2 | 7.b | odd | 2 | 1 | ||
| 1323.4.a.t | 2 | 21.c | even | 2 | 1 | ||
| 1728.4.a.bk | 2 | 8.d | odd | 2 | 1 | ||
| 1728.4.a.bk | 2 | 24.f | even | 2 | 1 | ||
| 1728.4.a.bp | 2 | 8.b | even | 2 | 1 | ||
| 1728.4.a.bp | 2 | 24.h | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{2} - 18 \)
acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(27))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} - 18 \)
|
| $3$ |
\( T^{2} \)
|
| $5$ |
\( T^{2} - 288 \)
|
| $7$ |
\( (T - 11)^{2} \)
|
| $11$ |
\( T^{2} - 288 \)
|
| $13$ |
\( (T - 29)^{2} \)
|
| $17$ |
\( T^{2} - 2592 \)
|
| $19$ |
\( (T - 29)^{2} \)
|
| $23$ |
\( T^{2} - 7200 \)
|
| $29$ |
\( T^{2} - 73728 \)
|
| $31$ |
\( (T + 268)^{2} \)
|
| $37$ |
\( (T - 83)^{2} \)
|
| $41$ |
\( T^{2} - 73728 \)
|
| $43$ |
\( (T + 232)^{2} \)
|
| $47$ |
\( T^{2} - 152352 \)
|
| $53$ |
\( T^{2} - 93312 \)
|
| $59$ |
\( T^{2} - 83232 \)
|
| $61$ |
\( (T - 767)^{2} \)
|
| $67$ |
\( (T + 511)^{2} \)
|
| $71$ |
\( T^{2} - 508032 \)
|
| $73$ |
\( (T - 137)^{2} \)
|
| $79$ |
\( (T + 475)^{2} \)
|
| $83$ |
\( T^{2} - 332928 \)
|
| $89$ |
\( T^{2} - 64800 \)
|
| $97$ |
\( (T - 821)^{2} \)
|
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