Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [423,2,Mod(1,423)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(423, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("423.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 423 = 3^{2} \cdot 47 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 423.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: | \(3.37767200550\) |
| Analytic rank: | \(0\) |
| 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: | no (minimal twist has level 141) |
| 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 |
|
−1.56155 | 0 | 0.438447 | −2.56155 | 0 | 2.56155 | 2.43845 | 0 | 4.00000 | ||||||||||||||||||||||||
| 1.2 | 2.56155 | 0 | 4.56155 | 1.56155 | 0 | −1.56155 | 6.56155 | 0 | 4.00000 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(3\) | \(-1\) |
| \(47\) | \(1\) |
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 | 423.2.a.h | 2 | |
| 3.b | odd | 2 | 1 | 141.2.a.f | ✓ | 2 | |
| 4.b | odd | 2 | 1 | 6768.2.a.y | 2 | ||
| 12.b | even | 2 | 1 | 2256.2.a.s | 2 | ||
| 15.d | odd | 2 | 1 | 3525.2.a.q | 2 | ||
| 21.c | even | 2 | 1 | 6909.2.a.m | 2 | ||
| 24.f | even | 2 | 1 | 9024.2.a.ca | 2 | ||
| 24.h | odd | 2 | 1 | 9024.2.a.cf | 2 | ||
| 141.c | even | 2 | 1 | 6627.2.a.k | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 141.2.a.f | ✓ | 2 | 3.b | odd | 2 | 1 | |
| 423.2.a.h | 2 | 1.a | even | 1 | 1 | trivial | |
| 2256.2.a.s | 2 | 12.b | even | 2 | 1 | ||
| 3525.2.a.q | 2 | 15.d | odd | 2 | 1 | ||
| 6627.2.a.k | 2 | 141.c | even | 2 | 1 | ||
| 6768.2.a.y | 2 | 4.b | odd | 2 | 1 | ||
| 6909.2.a.m | 2 | 21.c | even | 2 | 1 | ||
| 9024.2.a.ca | 2 | 24.f | even | 2 | 1 | ||
| 9024.2.a.cf | 2 | 24.h | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(423))\):
|
\( T_{2}^{2} - T_{2} - 4 \)
|
|
\( T_{5}^{2} + T_{5} - 4 \)
|
|
\( T_{7}^{2} - T_{7} - 4 \)
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Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} - T - 4 \)
|
| $3$ |
\( T^{2} \)
|
| $5$ |
\( T^{2} + T - 4 \)
|
| $7$ |
\( T^{2} - T - 4 \)
|
| $11$ |
\( T^{2} + 7T + 8 \)
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| $13$ |
\( T^{2} + 6T - 8 \)
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| $17$ |
\( T^{2} + 2T - 16 \)
|
| $19$ |
\( (T - 6)^{2} \)
|
| $23$ |
\( T^{2} - 3T - 36 \)
|
| $29$ |
\( T^{2} - 15T + 52 \)
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| $31$ |
\( T^{2} - 6T - 8 \)
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| $37$ |
\( T^{2} - 11T + 26 \)
|
| $41$ |
\( T^{2} + 6T - 8 \)
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| $43$ |
\( T^{2} - 14T + 32 \)
|
| $47$ |
\( (T + 1)^{2} \)
|
| $53$ |
\( T^{2} - 8T - 52 \)
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| $59$ |
\( T^{2} + 6T - 8 \)
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| $61$ |
\( (T - 2)^{2} \)
|
| $67$ |
\( T^{2} - 2T - 16 \)
|
| $71$ |
\( T^{2} - 2T - 16 \)
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| $73$ |
\( T^{2} - 10T + 8 \)
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| $79$ |
\( T^{2} + 15T + 52 \)
|
| $83$ |
\( T^{2} + 6T - 8 \)
|
| $89$ |
\( T^{2} - 68 \)
|
| $97$ |
\( T^{2} + 5T - 202 \)
|
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