Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1840,4,Mod(1,1840)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1840, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 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("1840.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1840 = 2^{4} \cdot 5 \cdot 23 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1840.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: | \(108.563514411\) |
| Analytic rank: | \(0\) |
| Dimension: | \(3\) |
| Coefficient field: | 3.3.318165.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{3} - x^{2} - 45x + 60 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 230) |
| 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
\( x^{3} - x^{2} - 45x + 60 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} + \nu - 31 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{2} - \beta _1 + 31 \)
|
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 | −6.84916 | 0 | 5.00000 | 0 | 28.6094 | 0 | 19.9110 | 0 | |||||||||||||||||||||||||||
| 1.2 | 0 | 1.34735 | 0 | 5.00000 | 0 | −32.8794 | 0 | −25.1847 | 0 | ||||||||||||||||||||||||||||
| 1.3 | 0 | 6.50182 | 0 | 5.00000 | 0 | −2.73001 | 0 | 15.2736 | 0 | ||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(5\) | \(-1\) |
| \(23\) | \(1\) |
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 | 1840.4.a.j | 3 | |
| 4.b | odd | 2 | 1 | 230.4.a.g | ✓ | 3 | |
| 12.b | even | 2 | 1 | 2070.4.a.ba | 3 | ||
| 20.d | odd | 2 | 1 | 1150.4.a.m | 3 | ||
| 20.e | even | 4 | 2 | 1150.4.b.l | 6 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 230.4.a.g | ✓ | 3 | 4.b | odd | 2 | 1 | |
| 1150.4.a.m | 3 | 20.d | odd | 2 | 1 | ||
| 1150.4.b.l | 6 | 20.e | even | 4 | 2 | ||
| 1840.4.a.j | 3 | 1.a | even | 1 | 1 | trivial | |
| 2070.4.a.ba | 3 | 12.b | even | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(1840))\):
|
\( T_{3}^{3} - T_{3}^{2} - 45T_{3} + 60 \)
|
|
\( T_{7}^{3} + 7T_{7}^{2} - 929T_{7} - 2568 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{3} \)
|
| $3$ |
\( T^{3} - T^{2} + \cdots + 60 \)
|
| $5$ |
\( (T - 5)^{3} \)
|
| $7$ |
\( T^{3} + 7 T^{2} + \cdots - 2568 \)
|
| $11$ |
\( T^{3} + 27 T^{2} + \cdots - 89388 \)
|
| $13$ |
\( T^{3} - 75 T^{2} + \cdots + 275238 \)
|
| $17$ |
\( T^{3} - 127 T^{2} + \cdots + 96550 \)
|
| $19$ |
\( T^{3} - 185 T^{2} + \cdots - 37596 \)
|
| $23$ |
\( (T + 23)^{3} \)
|
| $29$ |
\( T^{3} - 344 T^{2} + \cdots + 291288 \)
|
| $31$ |
\( T^{3} + 397 T^{2} + \cdots - 1547080 \)
|
| $37$ |
\( T^{3} - 978 T^{2} + \cdots - 33005536 \)
|
| $41$ |
\( T^{3} + 575 T^{2} + \cdots - 50953878 \)
|
| $43$ |
\( T^{3} + 812 T^{2} + \cdots - 10161920 \)
|
| $47$ |
\( T^{3} - 270 T^{2} + \cdots - 3184000 \)
|
| $53$ |
\( T^{3} - 510 T^{2} + \cdots + 89503704 \)
|
| $59$ |
\( T^{3} + 142 T^{2} + \cdots + 9906704 \)
|
| $61$ |
\( T^{3} + 49 T^{2} + \cdots - 23572158 \)
|
| $67$ |
\( T^{3} + 1616 T^{2} + \cdots + 111600960 \)
|
| $71$ |
\( T^{3} - 471 T^{2} + \cdots + 75603760 \)
|
| $73$ |
\( T^{3} + 780 T^{2} + \cdots - 672863896 \)
|
| $79$ |
\( T^{3} - 860 T^{2} + \cdots + 8296704 \)
|
| $83$ |
\( T^{3} - 288 T^{2} + \cdots + 106176592 \)
|
| $89$ |
\( T^{3} + \cdots - 1109897568 \)
|
| $97$ |
\( T^{3} - 1321 T^{2} + \cdots + 689377182 \)
|
| show more | |
| show less |