Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [261,4,Mod(1,261)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(261, 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("261.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 261 = 3^{2} \cdot 29 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 261.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: | \(15.3994985115\) |
| 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: | no (minimal twist has level 87) |
| 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 |
|
−2.70156 | 0 | −0.701562 | 10.1047 | 0 | −18.4031 | 23.5078 | 0 | −27.2984 | ||||||||||||||||||||||||
| 1.2 | 3.70156 | 0 | 5.70156 | −9.10469 | 0 | −5.59688 | −8.50781 | 0 | −33.7016 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(3\) | \(-1\) |
| \(29\) | \(1\) |
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 | 261.4.a.a | 2 | |
| 3.b | odd | 2 | 1 | 87.4.a.b | ✓ | 2 | |
| 12.b | even | 2 | 1 | 1392.4.a.k | 2 | ||
| 15.d | odd | 2 | 1 | 2175.4.a.f | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 87.4.a.b | ✓ | 2 | 3.b | odd | 2 | 1 | |
| 261.4.a.a | 2 | 1.a | even | 1 | 1 | trivial | |
| 1392.4.a.k | 2 | 12.b | even | 2 | 1 | ||
| 2175.4.a.f | 2 | 15.d | odd | 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 \(S_{4}^{\mathrm{new}}(\Gamma_0(261))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} - T - 10 \)
|
| $3$ |
\( T^{2} \)
|
| $5$ |
\( T^{2} - T - 92 \)
|
| $7$ |
\( T^{2} + 24T + 103 \)
|
| $11$ |
\( T^{2} + 25T + 146 \)
|
| $13$ |
\( T^{2} + 71T - 472 \)
|
| $17$ |
\( T^{2} - 98T + 2237 \)
|
| $19$ |
\( T^{2} + 21T - 720 \)
|
| $23$ |
\( T^{2} - 62T + 920 \)
|
| $29$ |
\( (T + 29)^{2} \)
|
| $31$ |
\( T^{2} - 66T + 1048 \)
|
| $37$ |
\( T^{2} + 539T + 72538 \)
|
| $41$ |
\( T^{2} - 101T - 18206 \)
|
| $43$ |
\( T^{2} + 155T - 144064 \)
|
| $47$ |
\( T^{2} + 526T + 45553 \)
|
| $53$ |
\( T^{2} - 698T + 77152 \)
|
| $59$ |
\( T^{2} + 455T + 45350 \)
|
| $61$ |
\( T^{2} - 44T - 65116 \)
|
| $67$ |
\( T^{2} + 1551 T + 563260 \)
|
| $71$ |
\( T^{2} + 126T - 335552 \)
|
| $73$ |
\( T^{2} + 760T + 131116 \)
|
| $79$ |
\( T^{2} + 158T - 904000 \)
|
| $83$ |
\( T^{2} - 934T - 151936 \)
|
| $89$ |
\( T^{2} - 691 T - 1612070 \)
|
| $97$ |
\( T^{2} - 532T - 1568 \)
|
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