Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [2793,2,Mod(1,2793)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(2793, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 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("2793.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 2793 = 3 \cdot 7^{2} \cdot 19 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 2793.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: | \(22.3022172845\) |
| Analytic rank: | \(1\) |
| Dimension: | \(4\) |
| Coefficient field: | 4.4.1957.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - 4x^{2} - x + 1 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 399) |
| 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 a basis \(1,\beta_1,\beta_2,\beta_3\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.
Basis of coefficient ring in terms of a root \(\nu\) of
\( x^{4} - 4x^{2} - x + 1 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{3} - 4\nu - 1 \)
|
| \(\beta_{3}\) | \(=\) |
\( -\nu^{3} + \nu^{2} + 3\nu - 1 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{3} + \beta_{2} + \beta _1 + 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{2} + 4\beta _1 + 1 \)
|
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 |
|
−2.06150 | 1.00000 | 2.24978 | −3.24978 | −2.06150 | 0 | −0.514916 | 1.00000 | 6.69941 | ||||||||||||||||||||||||||||||
| 1.2 | −0.396339 | 1.00000 | −1.84292 | 0.842916 | −0.396339 | 0 | 1.52310 | 1.00000 | −0.334080 | |||||||||||||||||||||||||||||||
| 1.3 | 0.693822 | 1.00000 | −1.51861 | 0.518610 | 0.693822 | 0 | −2.44129 | 1.00000 | 0.359824 | |||||||||||||||||||||||||||||||
| 1.4 | 1.76401 | 1.00000 | 1.11175 | −2.11175 | 1.76401 | 0 | −1.56689 | 1.00000 | −3.72516 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(3\) | \( -1 \) |
| \(7\) | \( -1 \) |
| \(19\) | \( +1 \) |
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 | 2793.2.a.bd | 4 | |
| 3.b | odd | 2 | 1 | 8379.2.a.bt | 4 | ||
| 7.b | odd | 2 | 1 | 2793.2.a.bc | 4 | ||
| 7.d | odd | 6 | 2 | 399.2.j.d | ✓ | 8 | |
| 21.c | even | 2 | 1 | 8379.2.a.br | 4 | ||
| 21.g | even | 6 | 2 | 1197.2.j.k | 8 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 399.2.j.d | ✓ | 8 | 7.d | odd | 6 | 2 | |
| 1197.2.j.k | 8 | 21.g | even | 6 | 2 | ||
| 2793.2.a.bc | 4 | 7.b | odd | 2 | 1 | ||
| 2793.2.a.bd | 4 | 1.a | even | 1 | 1 | trivial | |
| 8379.2.a.br | 4 | 21.c | even | 2 | 1 | ||
| 8379.2.a.bt | 4 | 3.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(2793))\):
|
\( T_{2}^{4} - 4T_{2}^{2} + T_{2} + 1 \)
|
|
\( T_{5}^{4} + 4T_{5}^{3} - 7T_{5} + 3 \)
|
|
\( T_{11}^{4} + 2T_{11}^{3} - 22T_{11}^{2} + 27T_{11} + 1 \)
|
|
\( T_{13}^{4} + 6T_{13}^{3} - 10T_{13}^{2} - 107T_{13} - 141 \)
|
|
\( T_{17}^{4} - 2T_{17}^{3} - 16T_{17}^{2} + 18T_{17} + 47 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} - 4T^{2} + T + 1 \)
|
| $3$ |
\( (T - 1)^{4} \)
|
| $5$ |
\( T^{4} + 4 T^{3} + \cdots + 3 \)
|
| $7$ |
\( T^{4} \)
|
| $11$ |
\( T^{4} + 2 T^{3} + \cdots + 1 \)
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| $13$ |
\( T^{4} + 6 T^{3} + \cdots - 141 \)
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| $17$ |
\( T^{4} - 2 T^{3} + \cdots + 47 \)
|
| $19$ |
\( (T + 1)^{4} \)
|
| $23$ |
\( T^{4} - 5 T^{3} + \cdots - 9 \)
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| $29$ |
\( T^{4} + 4 T^{3} + \cdots + 303 \)
|
| $31$ |
\( T^{4} + 17 T^{3} + \cdots - 987 \)
|
| $37$ |
\( T^{4} + 3 T^{3} + \cdots + 31 \)
|
| $41$ |
\( T^{4} + 7 T^{3} + \cdots - 43 \)
|
| $43$ |
\( T^{4} + 15 T^{3} + \cdots - 301 \)
|
| $47$ |
\( T^{4} + 16 T^{3} + \cdots - 3527 \)
|
| $53$ |
\( T^{4} - 4 T^{3} + \cdots + 651 \)
|
| $59$ |
\( T^{4} + 17 T^{3} + \cdots - 961 \)
|
| $61$ |
\( T^{4} - 9 T^{3} + \cdots + 487 \)
|
| $67$ |
\( T^{4} + 5 T^{3} + \cdots + 1487 \)
|
| $71$ |
\( T^{4} - 6 T^{3} + \cdots - 47 \)
|
| $73$ |
\( T^{4} + 15 T^{3} + \cdots - 2477 \)
|
| $79$ |
\( T^{4} - 5 T^{3} + \cdots + 17931 \)
|
| $83$ |
\( T^{4} + 34 T^{3} + \cdots + 2733 \)
|
| $89$ |
\( T^{4} - 3 T^{3} + \cdots + 18133 \)
|
| $97$ |
\( T^{4} + 11 T^{3} + \cdots + 1451 \)
|
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