Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [46,4,Mod(1,46)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(46, 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("46.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 46 = 2 \cdot 23 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 46.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: | \(2.71408786026\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{73}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x - 18 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| 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 \(\beta = \frac{1}{2}(1 + \sqrt{73})\). 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 |
|
2.00000 | −2.77200 | 4.00000 | 13.5440 | −5.54400 | 23.0880 | 8.00000 | −19.3160 | 27.0880 | ||||||||||||||||||||||||
| 1.2 | 2.00000 | 5.77200 | 4.00000 | −3.54400 | 11.5440 | −11.0880 | 8.00000 | 6.31601 | −7.08801 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(23\) | \(-1\) |
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 | 46.4.a.d | ✓ | 2 |
| 3.b | odd | 2 | 1 | 414.4.a.f | 2 | ||
| 4.b | odd | 2 | 1 | 368.4.a.f | 2 | ||
| 5.b | even | 2 | 1 | 1150.4.a.j | 2 | ||
| 5.c | odd | 4 | 2 | 1150.4.b.j | 4 | ||
| 7.b | odd | 2 | 1 | 2254.4.a.f | 2 | ||
| 8.b | even | 2 | 1 | 1472.4.a.k | 2 | ||
| 8.d | odd | 2 | 1 | 1472.4.a.n | 2 | ||
| 23.b | odd | 2 | 1 | 1058.4.a.j | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 46.4.a.d | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 368.4.a.f | 2 | 4.b | odd | 2 | 1 | ||
| 414.4.a.f | 2 | 3.b | odd | 2 | 1 | ||
| 1058.4.a.j | 2 | 23.b | odd | 2 | 1 | ||
| 1150.4.a.j | 2 | 5.b | even | 2 | 1 | ||
| 1150.4.b.j | 4 | 5.c | odd | 4 | 2 | ||
| 1472.4.a.k | 2 | 8.b | even | 2 | 1 | ||
| 1472.4.a.n | 2 | 8.d | odd | 2 | 1 | ||
| 2254.4.a.f | 2 | 7.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{2} - 3T_{3} - 16 \)
acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(46))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T - 2)^{2} \)
|
| $3$ |
\( T^{2} - 3T - 16 \)
|
| $5$ |
\( T^{2} - 10T - 48 \)
|
| $7$ |
\( T^{2} - 12T - 256 \)
|
| $11$ |
\( (T + 6)^{2} \)
|
| $13$ |
\( T^{2} + 51T - 1558 \)
|
| $17$ |
\( T^{2} + 66T + 432 \)
|
| $19$ |
\( T^{2} + 16T - 7236 \)
|
| $23$ |
\( (T - 23)^{2} \)
|
| $29$ |
\( T^{2} + 57T - 19062 \)
|
| $31$ |
\( T^{2} + 17T - 86816 \)
|
| $37$ |
\( T^{2} - 206T - 15744 \)
|
| $41$ |
\( T^{2} - 373T + 19434 \)
|
| $43$ |
\( T^{2} - 314T - 98064 \)
|
| $47$ |
\( T^{2} - 859T + 173064 \)
|
| $53$ |
\( T^{2} - 50T - 25728 \)
|
| $59$ |
\( T^{2} - 612T + 27936 \)
|
| $61$ |
\( T^{2} + 1062 T + 220568 \)
|
| $67$ |
\( T^{2} + 844T + 120852 \)
|
| $71$ |
\( T^{2} - 399T + 31752 \)
|
| $73$ |
\( T^{2} + 1277 T + 407518 \)
|
| $79$ |
\( T^{2} - 122T - 8616 \)
|
| $83$ |
\( T^{2} - 1802 T + 802968 \)
|
| $89$ |
\( T^{2} - 2046 T + 1040616 \)
|
| $97$ |
\( T^{2} + 910 T - 1163112 \)
|
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