Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [40,10,Mod(1,40)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(40, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 0]))
N = Newforms(chi, 10, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("40.1");
S:= CuspForms(chi, 10);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 40 = 2^{3} \cdot 5 \) |
| Weight: | \( k \) | \(=\) | \( 10 \) |
| Character orbit: | \([\chi]\) | \(=\) | 40.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: | \(20.6014334466\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{46}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - 46 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 2^{3}\cdot 3 \) |
| 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 \(\beta = 24\sqrt{46}\). 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 |
|
0 | −108.776 | 0 | −625.000 | 0 | −2570.09 | 0 | −7850.80 | 0 | ||||||||||||||||||||||||
| 1.2 | 0 | 216.776 | 0 | −625.000 | 0 | 1662.09 | 0 | 27308.8 | 0 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(5\) | \(1\) |
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 | 40.10.a.c | ✓ | 2 |
| 3.b | odd | 2 | 1 | 360.10.a.g | 2 | ||
| 4.b | odd | 2 | 1 | 80.10.a.g | 2 | ||
| 5.b | even | 2 | 1 | 200.10.a.c | 2 | ||
| 5.c | odd | 4 | 2 | 200.10.c.d | 4 | ||
| 8.b | even | 2 | 1 | 320.10.a.n | 2 | ||
| 8.d | odd | 2 | 1 | 320.10.a.q | 2 | ||
| 20.d | odd | 2 | 1 | 400.10.a.r | 2 | ||
| 20.e | even | 4 | 2 | 400.10.c.m | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 40.10.a.c | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 80.10.a.g | 2 | 4.b | odd | 2 | 1 | ||
| 200.10.a.c | 2 | 5.b | even | 2 | 1 | ||
| 200.10.c.d | 4 | 5.c | odd | 4 | 2 | ||
| 320.10.a.n | 2 | 8.b | even | 2 | 1 | ||
| 320.10.a.q | 2 | 8.d | odd | 2 | 1 | ||
| 360.10.a.g | 2 | 3.b | odd | 2 | 1 | ||
| 400.10.a.r | 2 | 20.d | odd | 2 | 1 | ||
| 400.10.c.m | 4 | 20.e | even | 4 | 2 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{2} - 108T_{3} - 23580 \)
acting on \(S_{10}^{\mathrm{new}}(\Gamma_0(40))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} \)
|
| $3$ |
\( T^{2} - 108T - 23580 \)
|
| $5$ |
\( (T + 625)^{2} \)
|
| $7$ |
\( T^{2} + 908 T - 4271708 \)
|
| $11$ |
\( T^{2} - 25120 T - 318008576 \)
|
| $13$ |
\( T^{2} + \cdots - 2558426108 \)
|
| $17$ |
\( T^{2} + \cdots + 7111617700 \)
|
| $19$ |
\( T^{2} + \cdots - 273876705776 \)
|
| $23$ |
\( T^{2} + \cdots + 363587809732 \)
|
| $29$ |
\( T^{2} + \cdots + 480965491876 \)
|
| $31$ |
\( T^{2} + \cdots + 20138081829520 \)
|
| $37$ |
\( T^{2} + \cdots - 155824381229436 \)
|
| $41$ |
\( T^{2} + \cdots - 149515623312732 \)
|
| $43$ |
\( T^{2} + \cdots + 69358444830148 \)
|
| $47$ |
\( T^{2} + \cdots - 11\!\cdots\!84 \)
|
| $53$ |
\( T^{2} + \cdots - 31\!\cdots\!84 \)
|
| $59$ |
\( T^{2} + \cdots - 58\!\cdots\!52 \)
|
| $61$ |
\( T^{2} + \cdots - 10\!\cdots\!60 \)
|
| $67$ |
\( T^{2} + \cdots - 32\!\cdots\!48 \)
|
| $71$ |
\( T^{2} + \cdots - 23\!\cdots\!40 \)
|
| $73$ |
\( T^{2} + \cdots + 12\!\cdots\!12 \)
|
| $79$ |
\( T^{2} + \cdots + 36\!\cdots\!80 \)
|
| $83$ |
\( T^{2} + \cdots - 33\!\cdots\!32 \)
|
| $89$ |
\( T^{2} + \cdots - 11\!\cdots\!36 \)
|
| $97$ |
\( T^{2} + \cdots + 98\!\cdots\!96 \)
|
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