Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [55,4,Mod(1,55)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(55, 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("55.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 55 = 5 \cdot 11 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 55.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: | \(3.24510505032\) |
| Analytic rank: | \(1\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{17}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x - 4 \)
|
| 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 \(\beta = \frac{1}{2}(1 + \sqrt{17})\). 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 |
|
−5.56155 | −3.56155 | 22.9309 | 5.00000 | 19.8078 | 6.05398 | −83.0388 | −14.3153 | −27.8078 | ||||||||||||||||||||||||
| 1.2 | −1.43845 | 0.561553 | −5.93087 | 5.00000 | −0.807764 | −31.0540 | 20.0388 | −26.6847 | −7.19224 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(5\) | \(-1\) |
| \(11\) | \(1\) |
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 | 55.4.a.b | ✓ | 2 |
| 3.b | odd | 2 | 1 | 495.4.a.e | 2 | ||
| 4.b | odd | 2 | 1 | 880.4.a.r | 2 | ||
| 5.b | even | 2 | 1 | 275.4.a.c | 2 | ||
| 5.c | odd | 4 | 2 | 275.4.b.b | 4 | ||
| 11.b | odd | 2 | 1 | 605.4.a.g | 2 | ||
| 15.d | odd | 2 | 1 | 2475.4.a.l | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 55.4.a.b | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 275.4.a.c | 2 | 5.b | even | 2 | 1 | ||
| 275.4.b.b | 4 | 5.c | odd | 4 | 2 | ||
| 495.4.a.e | 2 | 3.b | odd | 2 | 1 | ||
| 605.4.a.g | 2 | 11.b | odd | 2 | 1 | ||
| 880.4.a.r | 2 | 4.b | odd | 2 | 1 | ||
| 2475.4.a.l | 2 | 15.d | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{2} + 7T_{2} + 8 \)
acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(55))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} + 7T + 8 \)
|
| $3$ |
\( T^{2} + 3T - 2 \)
|
| $5$ |
\( (T - 5)^{2} \)
|
| $7$ |
\( T^{2} + 25T - 188 \)
|
| $11$ |
\( (T + 11)^{2} \)
|
| $13$ |
\( T^{2} + 50T + 200 \)
|
| $17$ |
\( T^{2} + 151T + 4472 \)
|
| $19$ |
\( T^{2} + 3T - 8604 \)
|
| $23$ |
\( T^{2} - 48T + 508 \)
|
| $29$ |
\( T^{2} + 221T - 9214 \)
|
| $31$ |
\( T^{2} - 141T - 53208 \)
|
| $37$ |
\( T^{2} + 559T + 70262 \)
|
| $41$ |
\( T^{2} + 144T - 98244 \)
|
| $43$ |
\( T^{2} + 60T - 102528 \)
|
| $47$ |
\( T^{2} + 48T - 41924 \)
|
| $53$ |
\( T^{2} - 117T - 117962 \)
|
| $59$ |
\( T^{2} + 86T - 104248 \)
|
| $61$ |
\( T^{2} + 155T - 54178 \)
|
| $67$ |
\( T^{2} - 266T - 77936 \)
|
| $71$ |
\( T^{2} - 1587 T + 613828 \)
|
| $73$ |
\( T^{2} - 70T - 13072 \)
|
| $79$ |
\( T^{2} + 1294 T + 363376 \)
|
| $83$ |
\( T^{2} + 558T - 231984 \)
|
| $89$ |
\( T^{2} + 1777 T + 781574 \)
|
| $97$ |
\( T^{2} + 334T - 848104 \)
|
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