Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [245,4,Mod(1,245)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(245, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([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("245.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 245 = 5 \cdot 7^{2} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 245.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: | \(14.4554679514\) |
| Analytic rank: | \(1\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{11}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - 11 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| Coefficient ring index: | \( 1 \) |
| 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 \(\beta = \sqrt{11}\). 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 |
|
−2.31662 | −5.00000 | −2.63325 | −5.00000 | 11.5831 | 0 | 24.6332 | −2.00000 | 11.5831 | ||||||||||||||||||||||||
| 1.2 | 4.31662 | −5.00000 | 10.6332 | −5.00000 | −21.5831 | 0 | 11.3668 | −2.00000 | −21.5831 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(5\) | \(1\) |
| \(7\) | \(-1\) |
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 | 245.4.a.i | ✓ | 2 |
| 3.b | odd | 2 | 1 | 2205.4.a.x | 2 | ||
| 5.b | even | 2 | 1 | 1225.4.a.q | 2 | ||
| 7.b | odd | 2 | 1 | 245.4.a.j | yes | 2 | |
| 7.c | even | 3 | 2 | 245.4.e.k | 4 | ||
| 7.d | odd | 6 | 2 | 245.4.e.j | 4 | ||
| 21.c | even | 2 | 1 | 2205.4.a.w | 2 | ||
| 35.c | odd | 2 | 1 | 1225.4.a.p | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 245.4.a.i | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 245.4.a.j | yes | 2 | 7.b | odd | 2 | 1 | |
| 245.4.e.j | 4 | 7.d | odd | 6 | 2 | ||
| 245.4.e.k | 4 | 7.c | even | 3 | 2 | ||
| 1225.4.a.p | 2 | 35.c | odd | 2 | 1 | ||
| 1225.4.a.q | 2 | 5.b | even | 2 | 1 | ||
| 2205.4.a.w | 2 | 21.c | even | 2 | 1 | ||
| 2205.4.a.x | 2 | 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 \(S_{4}^{\mathrm{new}}(\Gamma_0(245))\):
|
\( T_{2}^{2} - 2T_{2} - 10 \)
|
|
\( T_{3} + 5 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} - 2T - 10 \)
|
| $3$ |
\( (T + 5)^{2} \)
|
| $5$ |
\( (T + 5)^{2} \)
|
| $7$ |
\( T^{2} \)
|
| $11$ |
\( T^{2} - 66T + 913 \)
|
| $13$ |
\( T^{2} + 10T - 4375 \)
|
| $17$ |
\( T^{2} + 70T - 3175 \)
|
| $19$ |
\( T^{2} + 140T + 500 \)
|
| $23$ |
\( T^{2} + 16T - 8560 \)
|
| $29$ |
\( T^{2} + 258T - 8703 \)
|
| $31$ |
\( T^{2} - 20T - 39500 \)
|
| $37$ |
\( T^{2} - 328T + 5600 \)
|
| $41$ |
\( T^{2} + 300T - 87500 \)
|
| $43$ |
\( T^{2} + 116T + 1780 \)
|
| $47$ |
\( T^{2} - 30T - 17375 \)
|
| $53$ |
\( T^{2} - 540T - 85500 \)
|
| $59$ |
\( T^{2} + 380T + 18500 \)
|
| $61$ |
\( T^{2} + 1080 T + 252000 \)
|
| $67$ |
\( T^{2} - 468T - 46620 \)
|
| $71$ |
\( T^{2} + 1056 T + 233728 \)
|
| $73$ |
\( T^{2} - 860T - 255100 \)
|
| $79$ |
\( T^{2} - 158 T - 1325903 \)
|
| $83$ |
\( T^{2} + 40T - 439600 \)
|
| $89$ |
\( T^{2} - 240 T - 1574000 \)
|
| $97$ |
\( T^{2} + 1630 T + 307825 \)
|
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