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: | \(0\) |
| 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 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 \(\beta = \frac{1}{2}(1 + \sqrt{17})\). 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 | 3.00000 | −5.56155 | −5.00000 | −4.68466 | 10.2462 | 21.1771 | 9.00000 | 7.80776 | ||||||||||||||||||||||||
| 1.2 | 2.56155 | 3.00000 | −1.43845 | −5.00000 | 7.68466 | −6.24621 | −24.1771 | 9.00000 | −12.8078 | |||||||||||||||||||||||||
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.n | 2 | |
| 11.b | odd | 2 | 1 | 165.4.a.c | ✓ | 2 | |
| 33.d | even | 2 | 1 | 495.4.a.d | 2 | ||
| 55.d | odd | 2 | 1 | 825.4.a.m | 2 | ||
| 55.e | even | 4 | 2 | 825.4.c.j | 4 | ||
| 165.d | even | 2 | 1 | 2475.4.a.n | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 165.4.a.c | ✓ | 2 | 11.b | odd | 2 | 1 | |
| 495.4.a.d | 2 | 33.d | even | 2 | 1 | ||
| 825.4.a.m | 2 | 55.d | odd | 2 | 1 | ||
| 825.4.c.j | 4 | 55.e | even | 4 | 2 | ||
| 1815.4.a.n | 2 | 1.a | even | 1 | 1 | trivial | |
| 2475.4.a.n | 2 | 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 \(S_{4}^{\mathrm{new}}(\Gamma_0(1815))\):
|
\( T_{2}^{2} - T_{2} - 4 \)
|
|
\( T_{7}^{2} - 4T_{7} - 64 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} - T - 4 \)
|
| $3$ |
\( (T - 3)^{2} \)
|
| $5$ |
\( (T + 5)^{2} \)
|
| $7$ |
\( T^{2} - 4T - 64 \)
|
| $11$ |
\( T^{2} \)
|
| $13$ |
\( T^{2} - 90T + 2008 \)
|
| $17$ |
\( T^{2} - 16T - 8164 \)
|
| $19$ |
\( T^{2} - 170T + 5168 \)
|
| $23$ |
\( T^{2} + 124T - 11456 \)
|
| $29$ |
\( T^{2} - 158T + 1328 \)
|
| $31$ |
\( T^{2} - 60T + 288 \)
|
| $37$ |
\( T^{2} + 372T - 18716 \)
|
| $41$ |
\( T^{2} + 38T - 100432 \)
|
| $43$ |
\( T^{2} - 516T + 1216 \)
|
| $47$ |
\( T^{2} - 224T - 185744 \)
|
| $53$ |
\( T^{2} - 472T - 107572 \)
|
| $59$ |
\( T^{2} - 248T - 229424 \)
|
| $61$ |
\( T^{2} + 72T - 561812 \)
|
| $67$ |
\( T^{2} + 744T + 137296 \)
|
| $71$ |
\( T^{2} - 2060 T + 1052672 \)
|
| $73$ |
\( T^{2} - 486T + 44752 \)
|
| $79$ |
\( T^{2} + 642T - 294912 \)
|
| $83$ |
\( T^{2} - 286T - 750824 \)
|
| $89$ |
\( T^{2} - 244T - 54748 \)
|
| $97$ |
\( T^{2} + 168T - 771476 \)
|
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