Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [255,4,Mod(1,255)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(255, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 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("255.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 255 = 3 \cdot 5 \cdot 17 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 255.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: | \(15.0454870515\) |
| Analytic rank: | \(1\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{41}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x - 10 \)
|
| 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 \(\beta = \frac{1}{2}(1 + \sqrt{41})\). 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 |
|
−3.70156 | 3.00000 | 5.70156 | −5.00000 | −11.1047 | −9.29844 | 8.50781 | 9.00000 | 18.5078 | ||||||||||||||||||||||||
| 1.2 | 2.70156 | 3.00000 | −0.701562 | −5.00000 | 8.10469 | −15.7016 | −23.5078 | 9.00000 | −13.5078 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(3\) | \( -1 \) |
| \(5\) | \( +1 \) |
| \(17\) | \( +1 \) |
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 | 255.4.a.e | ✓ | 2 |
| 3.b | odd | 2 | 1 | 765.4.a.g | 2 | ||
| 5.b | even | 2 | 1 | 1275.4.a.n | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 255.4.a.e | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 765.4.a.g | 2 | 3.b | odd | 2 | 1 | ||
| 1275.4.a.n | 2 | 5.b | even | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{2} + T_{2} - 10 \)
acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(255))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} + T - 10 \)
|
| $3$ |
\( (T - 3)^{2} \)
|
| $5$ |
\( (T + 5)^{2} \)
|
| $7$ |
\( T^{2} + 25T + 146 \)
|
| $11$ |
\( T^{2} + T - 256 \)
|
| $13$ |
\( T^{2} + 12T - 128 \)
|
| $17$ |
\( (T + 17)^{2} \)
|
| $19$ |
\( T^{2} + 117T + 3412 \)
|
| $23$ |
\( T^{2} - 40T - 2224 \)
|
| $29$ |
\( T^{2} - 13T - 12514 \)
|
| $31$ |
\( T^{2} + 120T - 2304 \)
|
| $37$ |
\( T^{2} + 157T - 20498 \)
|
| $41$ |
\( T^{2} + 469T + 14308 \)
|
| $43$ |
\( T^{2} + 134T - 34912 \)
|
| $47$ |
\( T^{2} - 181T + 1784 \)
|
| $53$ |
\( T^{2} + 297T - 2558 \)
|
| $59$ |
\( T^{2} - 24T - 19700 \)
|
| $61$ |
\( T^{2} + 422T - 211360 \)
|
| $67$ |
\( T^{2} + 888T + 169420 \)
|
| $71$ |
\( T^{2} + 174T - 394272 \)
|
| $73$ |
\( T^{2} - 383T - 1468 \)
|
| $79$ |
\( T^{2} + 1282 T + 371480 \)
|
| $83$ |
\( T^{2} + 896T - 61696 \)
|
| $89$ |
\( T^{2} + 1388 T + 244820 \)
|
| $97$ |
\( T^{2} - 458 T - 1443280 \)
|
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