Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [768,4,Mod(193,768)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(768, base_ring=CyclotomicField(4))
chi = DirichletCharacter(H, H._module([0, 1, 0]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("768.193");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 768 = 2^{8} \cdot 3 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 768.j (of order \(4\), degree \(2\), 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: | \(45.3134668844\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Relative dimension: | \(2\) over \(\Q(i)\) |
| Coefficient field: | \(\Q(\zeta_{8})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{13}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{4}]$ |
$q$-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 a primitive root of unity \(\zeta_{8}\). We also show the integral \(q\)-expansion of the trace form.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/768\mathbb{Z}\right)^\times\).
| \(n\) | \(257\) | \(511\) | \(517\) |
| \(\chi(n)\) | \(1\) | \(1\) | \(\zeta_{8}^{2}\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 193.1 |
|
0 | −2.12132 | + | 2.12132i | 0 | 6.00000 | + | 6.00000i | 0 | − | 7.07107i | 0 | − | 9.00000i | 0 | ||||||||||||||||||||||||
| 193.2 | 0 | 2.12132 | − | 2.12132i | 0 | 6.00000 | + | 6.00000i | 0 | 7.07107i | 0 | − | 9.00000i | 0 | ||||||||||||||||||||||||||
| 577.1 | 0 | −2.12132 | − | 2.12132i | 0 | 6.00000 | − | 6.00000i | 0 | 7.07107i | 0 | 9.00000i | 0 | |||||||||||||||||||||||||||
| 577.2 | 0 | 2.12132 | + | 2.12132i | 0 | 6.00000 | − | 6.00000i | 0 | − | 7.07107i | 0 | 9.00000i | 0 | ||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 4.b | odd | 2 | 1 | inner |
| 16.e | even | 4 | 1 | inner |
| 16.f | odd | 4 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 768.4.j.b | yes | 4 |
| 4.b | odd | 2 | 1 | inner | 768.4.j.b | yes | 4 |
| 8.b | even | 2 | 1 | 768.4.j.a | ✓ | 4 | |
| 8.d | odd | 2 | 1 | 768.4.j.a | ✓ | 4 | |
| 16.e | even | 4 | 1 | 768.4.j.a | ✓ | 4 | |
| 16.e | even | 4 | 1 | inner | 768.4.j.b | yes | 4 |
| 16.f | odd | 4 | 1 | 768.4.j.a | ✓ | 4 | |
| 16.f | odd | 4 | 1 | inner | 768.4.j.b | yes | 4 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 768.4.j.a | ✓ | 4 | 8.b | even | 2 | 1 | |
| 768.4.j.a | ✓ | 4 | 8.d | odd | 2 | 1 | |
| 768.4.j.a | ✓ | 4 | 16.e | even | 4 | 1 | |
| 768.4.j.a | ✓ | 4 | 16.f | odd | 4 | 1 | |
| 768.4.j.b | yes | 4 | 1.a | even | 1 | 1 | trivial |
| 768.4.j.b | yes | 4 | 4.b | odd | 2 | 1 | inner |
| 768.4.j.b | yes | 4 | 16.e | even | 4 | 1 | inner |
| 768.4.j.b | yes | 4 | 16.f | odd | 4 | 1 | inner |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{5}^{2} - 12T_{5} + 72 \)
acting on \(S_{4}^{\mathrm{new}}(768, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} + 81 \)
|
| $5$ |
\( (T^{2} - 12 T + 72)^{2} \)
|
| $7$ |
\( (T^{2} + 50)^{2} \)
|
| $11$ |
\( T^{4} + 20736 \)
|
| $13$ |
\( (T^{2} - 50 T + 1250)^{2} \)
|
| $17$ |
\( (T + 6)^{4} \)
|
| $19$ |
\( T^{4} + 1296 \)
|
| $23$ |
\( (T^{2} + 648)^{2} \)
|
| $29$ |
\( (T^{2} - 312 T + 48672)^{2} \)
|
| $31$ |
\( (T^{2} - 26450)^{2} \)
|
| $37$ |
\( (T^{2} + 158 T + 12482)^{2} \)
|
| $41$ |
\( (T^{2} + 36)^{2} \)
|
| $43$ |
\( T^{4} + 15704099856 \)
|
| $47$ |
\( (T^{2} - 1800)^{2} \)
|
| $53$ |
\( (T^{2} - 696 T + 242208)^{2} \)
|
| $59$ |
\( T^{4} + 21743271936 \)
|
| $61$ |
\( (T^{2} - 466 T + 108578)^{2} \)
|
| $67$ |
\( T^{4} + 507422576896 \)
|
| $71$ |
\( (T^{2} + 705672)^{2} \)
|
| $73$ |
\( (T^{2} + 186624)^{2} \)
|
| $79$ |
\( (T^{2} - 97682)^{2} \)
|
| $83$ |
\( T^{4} + 443364212736 \)
|
| $89$ |
\( (T^{2} + 1258884)^{2} \)
|
| $97$ |
\( (T - 1596)^{4} \)
|
| show more | |
| show less |