Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [25,8,Mod(1,25)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(25, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0]))
N = Newforms(chi, 8, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("25.1");
S:= CuspForms(chi, 8);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 25 = 5^{2} \) |
| Weight: | \( k \) | \(=\) | \( 8 \) |
| Character orbit: | \([\chi]\) | \(=\) | 25.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: | \(7.80962563710\) |
| Analytic rank: | \(1\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{649}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x - 162 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| 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 \(\beta = \frac{1}{2}(1 + \sqrt{649})\). 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 |
|
−20.2377 | −45.4755 | 281.566 | 0 | 920.321 | 1369.97 | −3107.83 | −118.981 | 0 | ||||||||||||||||||||||||
| 1.2 | 5.23774 | 5.47548 | −100.566 | 0 | 28.6791 | −769.970 | −1197.17 | −2157.02 | 0 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(5\) | \(-1\) |
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 | 25.8.a.c | ✓ | 2 |
| 3.b | odd | 2 | 1 | 225.8.a.v | 2 | ||
| 4.b | odd | 2 | 1 | 400.8.a.bd | 2 | ||
| 5.b | even | 2 | 1 | 25.8.a.e | yes | 2 | |
| 5.c | odd | 4 | 2 | 25.8.b.b | 4 | ||
| 15.d | odd | 2 | 1 | 225.8.a.k | 2 | ||
| 15.e | even | 4 | 2 | 225.8.b.l | 4 | ||
| 20.d | odd | 2 | 1 | 400.8.a.v | 2 | ||
| 20.e | even | 4 | 2 | 400.8.c.s | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 25.8.a.c | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 25.8.a.e | yes | 2 | 5.b | even | 2 | 1 | |
| 25.8.b.b | 4 | 5.c | odd | 4 | 2 | ||
| 225.8.a.k | 2 | 15.d | odd | 2 | 1 | ||
| 225.8.a.v | 2 | 3.b | odd | 2 | 1 | ||
| 225.8.b.l | 4 | 15.e | even | 4 | 2 | ||
| 400.8.a.v | 2 | 20.d | odd | 2 | 1 | ||
| 400.8.a.bd | 2 | 4.b | odd | 2 | 1 | ||
| 400.8.c.s | 4 | 20.e | even | 4 | 2 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{2} + 15T_{2} - 106 \)
acting on \(S_{8}^{\mathrm{new}}(\Gamma_0(25))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} + 15T - 106 \)
|
| $3$ |
\( T^{2} + 40T - 249 \)
|
| $5$ |
\( T^{2} \)
|
| $7$ |
\( T^{2} - 600 T - 1054836 \)
|
| $11$ |
\( T^{2} - 4344 T - 5423041 \)
|
| $13$ |
\( T^{2} + 17680 T + 51136816 \)
|
| $17$ |
\( T^{2} + 6870 T - 68614471 \)
|
| $19$ |
\( T^{2} - 18200 T - 117098225 \)
|
| $23$ |
\( T^{2} + \cdots - 7241627844 \)
|
| $29$ |
\( T^{2} + \cdots - 27320953600 \)
|
| $31$ |
\( T^{2} + \cdots + 19481626044 \)
|
| $37$ |
\( T^{2} + \cdots + 72425629684 \)
|
| $41$ |
\( T^{2} + \cdots + 2293303049 \)
|
| $43$ |
\( T^{2} + \cdots + 168009863536 \)
|
| $47$ |
\( T^{2} + \cdots + 768835854224 \)
|
| $53$ |
\( T^{2} + \cdots - 310528480924 \)
|
| $59$ |
\( T^{2} + \cdots - 174052062400 \)
|
| $61$ |
\( T^{2} + \cdots - 8129212445516 \)
|
| $67$ |
\( T^{2} + \cdots - 858879415521 \)
|
| $71$ |
\( T^{2} + \cdots + 5183381635664 \)
|
| $73$ |
\( T^{2} + \cdots - 708123554519 \)
|
| $79$ |
\( T^{2} + \cdots + 11646468081900 \)
|
| $83$ |
\( T^{2} + \cdots + 35517015006471 \)
|
| $89$ |
\( T^{2} + \cdots - 22736713427775 \)
|
| $97$ |
\( T^{2} + \cdots + 70829616805924 \)
|
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