Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [490,4,Mod(1,490)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(490, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("490.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 490 = 2 \cdot 5 \cdot 7^{2} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 490.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: | \(28.9109359028\) |
| Analytic rank: | \(1\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{2}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - 2 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{11}]\) |
| 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 \(\beta = \sqrt{2}\). 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 |
|
−2.00000 | −5.24264 | 4.00000 | 5.00000 | 10.4853 | 0 | −8.00000 | 0.485281 | −10.0000 | ||||||||||||||||||||||||
| 1.2 | −2.00000 | 3.24264 | 4.00000 | 5.00000 | −6.48528 | 0 | −8.00000 | −16.4853 | −10.0000 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(1\) |
| \(5\) | \(-1\) |
| \(7\) | \(1\) |
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 | 490.4.a.q | ✓ | 2 |
| 5.b | even | 2 | 1 | 2450.4.a.by | 2 | ||
| 7.b | odd | 2 | 1 | 490.4.a.s | yes | 2 | |
| 7.c | even | 3 | 2 | 490.4.e.w | 4 | ||
| 7.d | odd | 6 | 2 | 490.4.e.v | 4 | ||
| 35.c | odd | 2 | 1 | 2450.4.a.bu | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 490.4.a.q | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 490.4.a.s | yes | 2 | 7.b | odd | 2 | 1 | |
| 490.4.e.v | 4 | 7.d | odd | 6 | 2 | ||
| 490.4.e.w | 4 | 7.c | even | 3 | 2 | ||
| 2450.4.a.bu | 2 | 35.c | odd | 2 | 1 | ||
| 2450.4.a.by | 2 | 5.b | even | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(490))\):
|
\( T_{3}^{2} + 2T_{3} - 17 \)
|
|
\( T_{11}^{2} + 26T_{11} + 41 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T + 2)^{2} \)
|
| $3$ |
\( T^{2} + 2T - 17 \)
|
| $5$ |
\( (T - 5)^{2} \)
|
| $7$ |
\( T^{2} \)
|
| $11$ |
\( T^{2} + 26T + 41 \)
|
| $13$ |
\( T^{2} - 102T + 2439 \)
|
| $17$ |
\( T^{2} + 186T + 8071 \)
|
| $19$ |
\( T^{2} + 36T - 188 \)
|
| $23$ |
\( T^{2} + 44T - 19918 \)
|
| $29$ |
\( T^{2} + 46T - 9839 \)
|
| $31$ |
\( T^{2} + 140T - 20638 \)
|
| $37$ |
\( T^{2} - 132T - 73262 \)
|
| $41$ |
\( T^{2} - 132T - 37694 \)
|
| $43$ |
\( T^{2} - 324T + 22372 \)
|
| $47$ |
\( T^{2} + 242T + 7679 \)
|
| $53$ |
\( T^{2} - 208T - 92242 \)
|
| $59$ |
\( T^{2} + 780T + 118818 \)
|
| $61$ |
\( T^{2} + 216T - 28664 \)
|
| $67$ |
\( T^{2} + 256T - 539074 \)
|
| $71$ |
\( T^{2} + 692T + 97244 \)
|
| $73$ |
\( T^{2} + 832T + 170168 \)
|
| $79$ |
\( T^{2} + 1962 T + 903193 \)
|
| $83$ |
\( T^{2} + 1712 T + 386624 \)
|
| $89$ |
\( T^{2} + 1960 T + 808048 \)
|
| $97$ |
\( T^{2} + 102 T - 1371881 \)
|
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