Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [50,4,Mod(49,50)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(50, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("50.49");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 50 = 2 \cdot 5^{2} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 50.b (of order \(2\), degree \(1\), not minimal) |
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: | no |
| Analytic conductor: | \(2.95009550029\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{-1}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} + 1 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{2}]$ |
$q$-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 \(i = \sqrt{-1}\). We also show the integral \(q\)-expansion of the trace form.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/50\mathbb{Z}\right)^\times\).
| \(n\) | \(27\) |
| \(\chi(n)\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 49.1 |
|
− | 2.00000i | 7.00000i | −4.00000 | 0 | 14.0000 | 34.0000i | 8.00000i | −22.0000 | 0 | |||||||||||||||||||||||
| 49.2 | 2.00000i | − | 7.00000i | −4.00000 | 0 | 14.0000 | − | 34.0000i | − | 8.00000i | −22.0000 | 0 | ||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 5.b | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 50.4.b.b | 2 | |
| 3.b | odd | 2 | 1 | 450.4.c.c | 2 | ||
| 4.b | odd | 2 | 1 | 400.4.c.d | 2 | ||
| 5.b | even | 2 | 1 | inner | 50.4.b.b | 2 | |
| 5.c | odd | 4 | 1 | 50.4.a.a | ✓ | 1 | |
| 5.c | odd | 4 | 1 | 50.4.a.e | yes | 1 | |
| 15.d | odd | 2 | 1 | 450.4.c.c | 2 | ||
| 15.e | even | 4 | 1 | 450.4.a.a | 1 | ||
| 15.e | even | 4 | 1 | 450.4.a.t | 1 | ||
| 20.d | odd | 2 | 1 | 400.4.c.d | 2 | ||
| 20.e | even | 4 | 1 | 400.4.a.d | 1 | ||
| 20.e | even | 4 | 1 | 400.4.a.r | 1 | ||
| 35.f | even | 4 | 1 | 2450.4.a.t | 1 | ||
| 35.f | even | 4 | 1 | 2450.4.a.y | 1 | ||
| 40.i | odd | 4 | 1 | 1600.4.a.f | 1 | ||
| 40.i | odd | 4 | 1 | 1600.4.a.bu | 1 | ||
| 40.k | even | 4 | 1 | 1600.4.a.g | 1 | ||
| 40.k | even | 4 | 1 | 1600.4.a.bv | 1 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 50.4.a.a | ✓ | 1 | 5.c | odd | 4 | 1 | |
| 50.4.a.e | yes | 1 | 5.c | odd | 4 | 1 | |
| 50.4.b.b | 2 | 1.a | even | 1 | 1 | trivial | |
| 50.4.b.b | 2 | 5.b | even | 2 | 1 | inner | |
| 400.4.a.d | 1 | 20.e | even | 4 | 1 | ||
| 400.4.a.r | 1 | 20.e | even | 4 | 1 | ||
| 400.4.c.d | 2 | 4.b | odd | 2 | 1 | ||
| 400.4.c.d | 2 | 20.d | odd | 2 | 1 | ||
| 450.4.a.a | 1 | 15.e | even | 4 | 1 | ||
| 450.4.a.t | 1 | 15.e | even | 4 | 1 | ||
| 450.4.c.c | 2 | 3.b | odd | 2 | 1 | ||
| 450.4.c.c | 2 | 15.d | odd | 2 | 1 | ||
| 1600.4.a.f | 1 | 40.i | odd | 4 | 1 | ||
| 1600.4.a.g | 1 | 40.k | even | 4 | 1 | ||
| 1600.4.a.bu | 1 | 40.i | odd | 4 | 1 | ||
| 1600.4.a.bv | 1 | 40.k | even | 4 | 1 | ||
| 2450.4.a.t | 1 | 35.f | even | 4 | 1 | ||
| 2450.4.a.y | 1 | 35.f | even | 4 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{2} + 49 \)
acting on \(S_{4}^{\mathrm{new}}(50, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} + 4 \)
|
| $3$ |
\( T^{2} + 49 \)
|
| $5$ |
\( T^{2} \)
|
| $7$ |
\( T^{2} + 1156 \)
|
| $11$ |
\( (T - 27)^{2} \)
|
| $13$ |
\( T^{2} + 784 \)
|
| $17$ |
\( T^{2} + 441 \)
|
| $19$ |
\( (T + 35)^{2} \)
|
| $23$ |
\( T^{2} + 6084 \)
|
| $29$ |
\( (T - 120)^{2} \)
|
| $31$ |
\( (T - 182)^{2} \)
|
| $37$ |
\( T^{2} + 21316 \)
|
| $41$ |
\( (T - 357)^{2} \)
|
| $43$ |
\( T^{2} + 21904 \)
|
| $47$ |
\( T^{2} + 7056 \)
|
| $53$ |
\( T^{2} + 492804 \)
|
| $59$ |
\( (T - 840)^{2} \)
|
| $61$ |
\( (T + 238)^{2} \)
|
| $67$ |
\( T^{2} + 212521 \)
|
| $71$ |
\( (T + 708)^{2} \)
|
| $73$ |
\( T^{2} + 17689 \)
|
| $79$ |
\( (T + 650)^{2} \)
|
| $83$ |
\( T^{2} + 815409 \)
|
| $89$ |
\( (T + 735)^{2} \)
|
| $97$ |
\( T^{2} + 1223236 \)
|
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