Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1815,4,Mod(1,1815)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1815, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 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("1815.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1815 = 3 \cdot 5 \cdot 11^{2} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1815.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: | \(107.088466660\) |
| Analytic rank: | \(1\) |
| Dimension: | \(3\) |
| Coefficient field: | 3.3.23612.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{3} - x^{2} - 20x + 26 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 165) |
| 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 \(1,\beta_1,\beta_2\) 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
\( x^{3} - x^{2} - 20x + 26 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} + \nu - 14 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{2} - \beta _1 + 14 \)
|
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 |
|
−3.59056 | −3.00000 | 4.89212 | −5.00000 | 10.7717 | 16.1465 | 11.1590 | 9.00000 | 17.9528 | |||||||||||||||||||||||||||
| 1.2 | 2.32906 | −3.00000 | −2.57547 | −5.00000 | −6.98719 | −22.4672 | −24.6309 | 9.00000 | −11.6453 | ||||||||||||||||||||||||||||
| 1.3 | 5.26150 | −3.00000 | 19.6833 | −5.00000 | −15.7845 | 10.3207 | 61.4719 | 9.00000 | −26.3075 | ||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(3\) | \(1\) |
| \(5\) | \(1\) |
| \(11\) | \(-1\) |
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 | 1815.4.a.s | 3 | |
| 11.b | odd | 2 | 1 | 165.4.a.d | ✓ | 3 | |
| 33.d | even | 2 | 1 | 495.4.a.l | 3 | ||
| 55.d | odd | 2 | 1 | 825.4.a.s | 3 | ||
| 55.e | even | 4 | 2 | 825.4.c.l | 6 | ||
| 165.d | even | 2 | 1 | 2475.4.a.s | 3 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 165.4.a.d | ✓ | 3 | 11.b | odd | 2 | 1 | |
| 495.4.a.l | 3 | 33.d | even | 2 | 1 | ||
| 825.4.a.s | 3 | 55.d | odd | 2 | 1 | ||
| 825.4.c.l | 6 | 55.e | even | 4 | 2 | ||
| 1815.4.a.s | 3 | 1.a | even | 1 | 1 | trivial | |
| 2475.4.a.s | 3 | 165.d | even | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(1815))\):
|
\( T_{2}^{3} - 4T_{2}^{2} - 15T_{2} + 44 \)
|
|
\( T_{7}^{3} - 4T_{7}^{2} - 428T_{7} + 3744 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{3} - 4 T^{2} + \cdots + 44 \)
|
| $3$ |
\( (T + 3)^{3} \)
|
| $5$ |
\( (T + 5)^{3} \)
|
| $7$ |
\( T^{3} - 4 T^{2} + \cdots + 3744 \)
|
| $11$ |
\( T^{3} \)
|
| $13$ |
\( T^{3} - 3560T + 34144 \)
|
| $17$ |
\( T^{3} - 218 T^{2} + \cdots + 235104 \)
|
| $19$ |
\( T^{3} + 146 T^{2} + \cdots + 30960 \)
|
| $23$ |
\( T^{3} + 200 T^{2} + \cdots + 1664 \)
|
| $29$ |
\( T^{3} + 68 T^{2} + \cdots - 3163056 \)
|
| $31$ |
\( T^{3} + 68 T^{2} + \cdots - 1812096 \)
|
| $37$ |
\( T^{3} + 390 T^{2} + \cdots + 618952 \)
|
| $41$ |
\( T^{3} - 196 T^{2} + \cdots + 4364208 \)
|
| $43$ |
\( T^{3} - 524 T^{2} + \cdots + 31273920 \)
|
| $47$ |
\( T^{3} + 60 T^{2} + \cdots - 20966976 \)
|
| $53$ |
\( T^{3} + 158 T^{2} + \cdots + 39574952 \)
|
| $59$ |
\( T^{3} + 1044 T^{2} + \cdots - 84227264 \)
|
| $61$ |
\( T^{3} + 642 T^{2} + \cdots - 22757384 \)
|
| $67$ |
\( T^{3} + 236 T^{2} + \cdots + 87537664 \)
|
| $71$ |
\( T^{3} + 544 T^{2} + \cdots + 6553600 \)
|
| $73$ |
\( T^{3} + 900 T^{2} + \cdots + 5609344 \)
|
| $79$ |
\( T^{3} - 1586 T^{2} + \cdots + 14694992 \)
|
| $83$ |
\( T^{3} - 1582 T^{2} + \cdots + 924645384 \)
|
| $89$ |
\( T^{3} + 2122 T^{2} + \cdots + 293444632 \)
|
| $97$ |
\( T^{3} - 618 T^{2} + \cdots - 223543736 \)
|
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