Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [38,4,Mod(1,38)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(38, 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("38.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 38 = 2 \cdot 19 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 38.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: | \(2.24207258022\) |
| 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 | 0.227998 | 4.00000 | 8.31601 | 0.455996 | 8.08801 | 8.00000 | −26.9480 | 16.6320 | ||||||||||||||||||||||||
| 1.2 | 2.00000 | 8.77200 | 4.00000 | −17.3160 | 17.5440 | −26.0880 | 8.00000 | 49.9480 | −34.6320 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \( -1 \) |
| \(19\) | \( -1 \) |
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 | 38.4.a.c | ✓ | 2 |
| 3.b | odd | 2 | 1 | 342.4.a.h | 2 | ||
| 4.b | odd | 2 | 1 | 304.4.a.c | 2 | ||
| 5.b | even | 2 | 1 | 950.4.a.e | 2 | ||
| 5.c | odd | 4 | 2 | 950.4.b.i | 4 | ||
| 7.b | odd | 2 | 1 | 1862.4.a.e | 2 | ||
| 8.b | even | 2 | 1 | 1216.4.a.g | 2 | ||
| 8.d | odd | 2 | 1 | 1216.4.a.p | 2 | ||
| 19.b | odd | 2 | 1 | 722.4.a.f | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 38.4.a.c | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 304.4.a.c | 2 | 4.b | odd | 2 | 1 | ||
| 342.4.a.h | 2 | 3.b | odd | 2 | 1 | ||
| 722.4.a.f | 2 | 19.b | odd | 2 | 1 | ||
| 950.4.a.e | 2 | 5.b | even | 2 | 1 | ||
| 950.4.b.i | 4 | 5.c | odd | 4 | 2 | ||
| 1216.4.a.g | 2 | 8.b | even | 2 | 1 | ||
| 1216.4.a.p | 2 | 8.d | odd | 2 | 1 | ||
| 1862.4.a.e | 2 | 7.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{2} - 9T_{3} + 2 \)
acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(38))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T - 2)^{2} \)
|
| $3$ |
\( T^{2} - 9T + 2 \)
|
| $5$ |
\( T^{2} + 9T - 144 \)
|
| $7$ |
\( T^{2} + 18T - 211 \)
|
| $11$ |
\( T^{2} + 17T + 54 \)
|
| $13$ |
\( T^{2} - 17T - 3012 \)
|
| $17$ |
\( T^{2} + 80T + 1527 \)
|
| $19$ |
\( (T - 19)^{2} \)
|
| $23$ |
\( T^{2} - 73T - 1752 \)
|
| $29$ |
\( T^{2} - 3T - 8046 \)
|
| $31$ |
\( T^{2} - 212T - 24096 \)
|
| $37$ |
\( T^{2} - 192T - 5092 \)
|
| $41$ |
\( T^{2} + 50T - 1200 \)
|
| $43$ |
\( T^{2} - 677T + 113688 \)
|
| $47$ |
\( T^{2} + 389T - 54168 \)
|
| $53$ |
\( T^{2} + 1219 T + 366216 \)
|
| $59$ |
\( T^{2} + 287T + 9186 \)
|
| $61$ |
\( T^{2} - 313T - 200366 \)
|
| $67$ |
\( T^{2} - 1223 T + 265728 \)
|
| $71$ |
\( T^{2} - 200T - 235572 \)
|
| $73$ |
\( T^{2} - 378T - 582151 \)
|
| $79$ |
\( T^{2} - 1350 T + 394232 \)
|
| $83$ |
\( T^{2} + 670T - 574632 \)
|
| $89$ |
\( T^{2} + 236T - 631104 \)
|
| $97$ |
\( T^{2} - 1294 T + 228736 \)
|
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