Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [175,5,Mod(76,175)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(175, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 1]))
N = Newforms(chi, 5, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("175.76");
S:= CuspForms(chi, 5);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 175 = 5^{2} \cdot 7 \) |
| Weight: | \( k \) | \(=\) | \( 5 \) |
| Character orbit: | \([\chi]\) | \(=\) | 175.d (of order \(2\), degree \(1\), minimal) |
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: | \(18.0897435397\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{21}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x - 5 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| Coefficient ring index: | \( 3 \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{U}(1)[D_{2}]$ |
$q$-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 \(\beta = \frac{1}{2}(1 + 3\sqrt{21})\). We also show the integral \(q\)-expansion of the trace form.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/175\mathbb{Z}\right)^\times\).
| \(n\) | \(101\) | \(127\) |
| \(\chi(n)\) | \(-1\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 76.1 |
|
−7.37386 | 0 | 38.3739 | 0 | 0 | 49.0000 | −164.982 | 81.0000 | 0 | ||||||||||||||||||||||||
| 76.2 | 6.37386 | 0 | 24.6261 | 0 | 0 | 49.0000 | 54.9818 | 81.0000 | 0 | |||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 7.b | odd | 2 | 1 | CM by \(\Q(\sqrt{-7}) \) |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 175.5.d.b | ✓ | 2 |
| 5.b | even | 2 | 1 | 175.5.d.d | yes | 2 | |
| 5.c | odd | 4 | 2 | 175.5.c.b | 4 | ||
| 7.b | odd | 2 | 1 | CM | 175.5.d.b | ✓ | 2 |
| 35.c | odd | 2 | 1 | 175.5.d.d | yes | 2 | |
| 35.f | even | 4 | 2 | 175.5.c.b | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 175.5.c.b | 4 | 5.c | odd | 4 | 2 | ||
| 175.5.c.b | 4 | 35.f | even | 4 | 2 | ||
| 175.5.d.b | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 175.5.d.b | ✓ | 2 | 7.b | odd | 2 | 1 | CM |
| 175.5.d.d | yes | 2 | 5.b | even | 2 | 1 | |
| 175.5.d.d | yes | 2 | 35.c | odd | 2 | 1 | |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{2} + T_{2} - 47 \)
acting on \(S_{5}^{\mathrm{new}}(175, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} + T - 47 \)
|
| $3$ |
\( T^{2} \)
|
| $5$ |
\( T^{2} \)
|
| $7$ |
\( (T - 49)^{2} \)
|
| $11$ |
\( T^{2} - 206T - 1487 \)
|
| $13$ |
\( T^{2} \)
|
| $17$ |
\( T^{2} \)
|
| $19$ |
\( T^{2} \)
|
| $23$ |
\( T^{2} - 734T - 300767 \)
|
| $29$ |
\( T^{2} + 1234 T - 599087 \)
|
| $31$ |
\( T^{2} \)
|
| $37$ |
\( T^{2} - 1294 T - 3948047 \)
|
| $41$ |
\( T^{2} \)
|
| $43$ |
\( T^{2} - 334 T - 10144847 \)
|
| $47$ |
\( T^{2} \)
|
| $53$ |
\( (T + 5582)^{2} \)
|
| $59$ |
\( T^{2} \)
|
| $61$ |
\( T^{2} \)
|
| $67$ |
\( T^{2} + 4946 T - 35990447 \)
|
| $71$ |
\( T^{2} + 2914 T - 67743647 \)
|
| $73$ |
\( T^{2} \)
|
| $79$ |
\( T^{2} - 3646 T - 103556927 \)
|
| $83$ |
\( T^{2} \)
|
| $89$ |
\( T^{2} \)
|
| $97$ |
\( T^{2} \)
|
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