Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [80,7,Mod(17,80)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(80, base_ring=CyclotomicField(4))
chi = DirichletCharacter(H, H._module([0, 0, 1]))
N = Newforms(chi, 7, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("80.17");
S:= CuspForms(chi, 7);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 80 = 2^{4} \cdot 5 \) |
| Weight: | \( k \) | \(=\) | \( 7 \) |
| Character orbit: | \([\chi]\) | \(=\) | 80.p (of order \(4\), degree \(2\), 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: | \(18.4043266896\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Relative dimension: | \(2\) over \(\Q(i)\) |
| Coefficient field: | \(\Q(i, \sqrt{201})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 101x^{2} + 2500 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 2 \) |
| Twist minimal: | no (minimal twist has level 5) |
| 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 basis \(1,\beta_1,\beta_2,\beta_3\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.
Basis of coefficient ring in terms of a root \(\nu\) of
\( x^{4} + 101x^{2} + 2500 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( \nu^{3} + 51\nu ) / 50 \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} + \nu + 51 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( \nu^{3} - 50\nu^{2} + 101\nu - 2550 ) / 50 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{3} + \beta_{2} - \beta_1 ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( -\beta_{3} + \beta_{2} + \beta _1 - 102 ) / 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( -51\beta_{3} - 51\beta_{2} + 151\beta_1 ) / 2 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/80\mathbb{Z}\right)^\times\).
| \(n\) | \(17\) | \(21\) | \(31\) |
| \(\chi(n)\) | \(\beta_{1}\) | \(1\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 17.1 |
|
0 | −14.5887 | + | 14.5887i | 0 | 88.8309 | − | 87.9436i | 0 | −59.5240 | − | 59.5240i | 0 | 303.338i | 0 | ||||||||||||||||||||||||
| 17.2 | 0 | −0.411277 | + | 0.411277i | 0 | −123.831 | − | 17.0564i | 0 | −215.476 | − | 215.476i | 0 | 728.662i | 0 | |||||||||||||||||||||||||
| 33.1 | 0 | −14.5887 | − | 14.5887i | 0 | 88.8309 | + | 87.9436i | 0 | −59.5240 | + | 59.5240i | 0 | − | 303.338i | 0 | ||||||||||||||||||||||||
| 33.2 | 0 | −0.411277 | − | 0.411277i | 0 | −123.831 | + | 17.0564i | 0 | −215.476 | + | 215.476i | 0 | − | 728.662i | 0 | ||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 5.c | odd | 4 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 80.7.p.b | 4 | |
| 4.b | odd | 2 | 1 | 5.7.c.a | ✓ | 4 | |
| 5.c | odd | 4 | 1 | inner | 80.7.p.b | 4 | |
| 12.b | even | 2 | 1 | 45.7.g.a | 4 | ||
| 20.d | odd | 2 | 1 | 25.7.c.c | 4 | ||
| 20.e | even | 4 | 1 | 5.7.c.a | ✓ | 4 | |
| 20.e | even | 4 | 1 | 25.7.c.c | 4 | ||
| 60.h | even | 2 | 1 | 225.7.g.c | 4 | ||
| 60.l | odd | 4 | 1 | 45.7.g.a | 4 | ||
| 60.l | odd | 4 | 1 | 225.7.g.c | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 5.7.c.a | ✓ | 4 | 4.b | odd | 2 | 1 | |
| 5.7.c.a | ✓ | 4 | 20.e | even | 4 | 1 | |
| 25.7.c.c | 4 | 20.d | odd | 2 | 1 | ||
| 25.7.c.c | 4 | 20.e | even | 4 | 1 | ||
| 45.7.g.a | 4 | 12.b | even | 2 | 1 | ||
| 45.7.g.a | 4 | 60.l | odd | 4 | 1 | ||
| 80.7.p.b | 4 | 1.a | even | 1 | 1 | trivial | |
| 80.7.p.b | 4 | 5.c | odd | 4 | 1 | inner | |
| 225.7.g.c | 4 | 60.h | even | 2 | 1 | ||
| 225.7.g.c | 4 | 60.l | odd | 4 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{4} + 30T_{3}^{3} + 450T_{3}^{2} + 360T_{3} + 144 \)
acting on \(S_{7}^{\mathrm{new}}(80, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} + 30 T^{3} + \cdots + 144 \)
|
| $5$ |
\( T^{4} + 70 T^{3} + \cdots + 244140625 \)
|
| $7$ |
\( T^{4} + 550 T^{3} + \cdots + 658025104 \)
|
| $11$ |
\( (T^{2} - 526 T - 1061456)^{2} \)
|
| $13$ |
\( T^{4} + \cdots + 1753977086884 \)
|
| $17$ |
\( T^{4} + \cdots + 65054193721924 \)
|
| $19$ |
\( T^{4} + \cdots + 41\!\cdots\!00 \)
|
| $23$ |
\( T^{4} + \cdots + 32\!\cdots\!24 \)
|
| $29$ |
\( T^{4} + \cdots + 20\!\cdots\!00 \)
|
| $31$ |
\( (T^{2} - 16586 T - 529326776)^{2} \)
|
| $37$ |
\( T^{4} + \cdots + 36\!\cdots\!64 \)
|
| $41$ |
\( (T^{2} + 106966 T - 2214944336)^{2} \)
|
| $43$ |
\( T^{4} + \cdots + 14\!\cdots\!04 \)
|
| $47$ |
\( T^{4} + \cdots + 63\!\cdots\!84 \)
|
| $53$ |
\( T^{4} + \cdots + 30\!\cdots\!44 \)
|
| $59$ |
\( T^{4} + \cdots + 58\!\cdots\!00 \)
|
| $61$ |
\( (T^{2} + 55526 T - 1518731456)^{2} \)
|
| $67$ |
\( T^{4} + \cdots + 50\!\cdots\!24 \)
|
| $71$ |
\( (T^{2} + 655094 T + 86681396584)^{2} \)
|
| $73$ |
\( T^{4} + \cdots + 21\!\cdots\!24 \)
|
| $79$ |
\( T^{4} + \cdots + 72\!\cdots\!00 \)
|
| $83$ |
\( T^{4} + \cdots + 11\!\cdots\!64 \)
|
| $89$ |
\( T^{4} + \cdots + 43\!\cdots\!00 \)
|
| $97$ |
\( T^{4} + \cdots + 13\!\cdots\!84 \)
|
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