Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [2,20,Mod(1,2)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(2, base_ring=CyclotomicField(1))
chi = DirichletCharacter(H, H._module([]))
N = Newforms(chi, 20, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("2.1");
S:= CuspForms(chi, 20);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 2 \) |
| Weight: | \( k \) | \(=\) | \( 20 \) |
| Character orbit: | \([\chi]\) | \(=\) | 2.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: | \(4.57633393113\) |
| Analytic rank: | \(0\) |
| Dimension: | \(1\) |
| Coefficient field: | \(\mathbb{Q}\) |
| Coefficient ring: | \(\mathbb{Z}\) |
| 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)
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 |
|
−512.000 | −13092.0 | 262144. | 6.54675e6 | 6.70310e6 | 9.66743e7 | −1.34218e8 | −9.90861e8 | −3.35194e9 | |||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(1\) |
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 | 2.20.a.a | ✓ | 1 |
| 3.b | odd | 2 | 1 | 18.20.a.d | 1 | ||
| 4.b | odd | 2 | 1 | 16.20.a.c | 1 | ||
| 5.b | even | 2 | 1 | 50.20.a.d | 1 | ||
| 5.c | odd | 4 | 2 | 50.20.b.c | 2 | ||
| 7.b | odd | 2 | 1 | 98.20.a.a | 1 | ||
| 8.b | even | 2 | 1 | 64.20.a.g | 1 | ||
| 8.d | odd | 2 | 1 | 64.20.a.c | 1 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 2.20.a.a | ✓ | 1 | 1.a | even | 1 | 1 | trivial |
| 16.20.a.c | 1 | 4.b | odd | 2 | 1 | ||
| 18.20.a.d | 1 | 3.b | odd | 2 | 1 | ||
| 50.20.a.d | 1 | 5.b | even | 2 | 1 | ||
| 50.20.b.c | 2 | 5.c | odd | 4 | 2 | ||
| 64.20.a.c | 1 | 8.d | odd | 2 | 1 | ||
| 64.20.a.g | 1 | 8.b | even | 2 | 1 | ||
| 98.20.a.a | 1 | 7.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3} + 13092 \)
acting on \(S_{20}^{\mathrm{new}}(\Gamma_0(2))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T + 512 \)
|
| $3$ |
\( T + 13092 \)
|
| $5$ |
\( T - 6546750 \)
|
| $7$ |
\( T - 96674264 \)
|
| $11$ |
\( T - 11799694452 \)
|
| $13$ |
\( T - 34401727958 \)
|
| $17$ |
\( T + 400697609166 \)
|
| $19$ |
\( T - 814875924620 \)
|
| $23$ |
\( T + 4937767258872 \)
|
| $29$ |
\( T + 96707212093050 \)
|
| $31$ |
\( T + 58447954952608 \)
|
| $37$ |
\( T - 246079341597854 \)
|
| $41$ |
\( T + 2049265663743558 \)
|
| $43$ |
\( T - 5698694101737428 \)
|
| $47$ |
\( T + 241487233520496 \)
|
| $53$ |
\( T + 16\!\cdots\!02 \)
|
| $59$ |
\( T + 93\!\cdots\!00 \)
|
| $61$ |
\( T + 41\!\cdots\!18 \)
|
| $67$ |
\( T - 98\!\cdots\!64 \)
|
| $71$ |
\( T + 10\!\cdots\!28 \)
|
| $73$ |
\( T + 17\!\cdots\!82 \)
|
| $79$ |
\( T + 14\!\cdots\!40 \)
|
| $83$ |
\( T - 31\!\cdots\!48 \)
|
| $89$ |
\( T - 11\!\cdots\!10 \)
|
| $97$ |
\( T + 11\!\cdots\!66 \)
|
| show more | |
| show less |