Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [60,8,Mod(59,60)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(60, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1, 1, 1]))
N = Newforms(chi, 8, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("60.59");
S:= CuspForms(chi, 8);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 60 = 2^{2} \cdot 3 \cdot 5 \) |
| Weight: | \( k \) | \(=\) | \( 8 \) |
| Character orbit: | \([\chi]\) | \(=\) | 60.h (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: | no |
| Analytic conductor: | \(18.7431015290\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\sqrt{-3}, \sqrt{5})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} + 2x^{2} + x + 1 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 2^{2} \) |
| 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 a basis \(1,\beta_1,\beta_2,\beta_3\) 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
\( x^{4} - x^{3} + 2x^{2} + x + 1 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu^{2} - \nu + 1 \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{3} - \nu^{2} + \nu + 1 \)
|
| \(\beta_{3}\) | \(=\) |
\( \nu^{3} - \nu^{2} + 3\nu + 1 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{3} - \beta_{2} ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{3} - \beta_{2} + 2\beta _1 - 2 ) / 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{2} + \beta _1 - 2 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/60\mathbb{Z}\right)^\times\).
| \(n\) | \(31\) | \(37\) | \(41\) |
| \(\chi(n)\) | \(-1\) | \(-1\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 59.1 |
|
−1.11803 | − | 11.2583i | 46.7654i | −125.500 | + | 25.1744i | −279.508 | 526.500 | − | 52.2853i | 0 | 423.735 | + | 1384.77i | −2187.00 | 312.500 | + | 3146.80i | ||||||||||||||||||||
| 59.2 | −1.11803 | + | 11.2583i | − | 46.7654i | −125.500 | − | 25.1744i | −279.508 | 526.500 | + | 52.2853i | 0 | 423.735 | − | 1384.77i | −2187.00 | 312.500 | − | 3146.80i | ||||||||||||||||||||
| 59.3 | 1.11803 | − | 11.2583i | 46.7654i | −125.500 | − | 25.1744i | 279.508 | 526.500 | + | 52.2853i | 0 | −423.735 | + | 1384.77i | −2187.00 | 312.500 | − | 3146.80i | |||||||||||||||||||||
| 59.4 | 1.11803 | + | 11.2583i | − | 46.7654i | −125.500 | + | 25.1744i | 279.508 | 526.500 | − | 52.2853i | 0 | −423.735 | − | 1384.77i | −2187.00 | 312.500 | + | 3146.80i | ||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 15.d | odd | 2 | 1 | CM by \(\Q(\sqrt{-15}) \) |
| 3.b | odd | 2 | 1 | inner |
| 4.b | odd | 2 | 1 | inner |
| 5.b | even | 2 | 1 | inner |
| 12.b | even | 2 | 1 | inner |
| 20.d | odd | 2 | 1 | inner |
| 60.h | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 60.8.h.b | ✓ | 4 |
| 3.b | odd | 2 | 1 | inner | 60.8.h.b | ✓ | 4 |
| 4.b | odd | 2 | 1 | inner | 60.8.h.b | ✓ | 4 |
| 5.b | even | 2 | 1 | inner | 60.8.h.b | ✓ | 4 |
| 12.b | even | 2 | 1 | inner | 60.8.h.b | ✓ | 4 |
| 15.d | odd | 2 | 1 | CM | 60.8.h.b | ✓ | 4 |
| 20.d | odd | 2 | 1 | inner | 60.8.h.b | ✓ | 4 |
| 60.h | even | 2 | 1 | inner | 60.8.h.b | ✓ | 4 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 60.8.h.b | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 60.8.h.b | ✓ | 4 | 3.b | odd | 2 | 1 | inner |
| 60.8.h.b | ✓ | 4 | 4.b | odd | 2 | 1 | inner |
| 60.8.h.b | ✓ | 4 | 5.b | even | 2 | 1 | inner |
| 60.8.h.b | ✓ | 4 | 12.b | even | 2 | 1 | inner |
| 60.8.h.b | ✓ | 4 | 15.d | odd | 2 | 1 | CM |
| 60.8.h.b | ✓ | 4 | 20.d | odd | 2 | 1 | inner |
| 60.8.h.b | ✓ | 4 | 60.h | even | 2 | 1 | inner |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{7} \)
acting on \(S_{8}^{\mathrm{new}}(60, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} + 251 T^{2} + 16384 \)
|
| $3$ |
\( (T^{2} + 2187)^{2} \)
|
| $5$ |
\( (T^{2} - 78125)^{2} \)
|
| $7$ |
\( T^{4} \)
|
| $11$ |
\( T^{4} \)
|
| $13$ |
\( T^{4} \)
|
| $17$ |
\( (T^{2} - 960220820)^{2} \)
|
| $19$ |
\( (T^{2} + 3441019740)^{2} \)
|
| $23$ |
\( (T^{2} + 3782028108)^{2} \)
|
| $29$ |
\( T^{4} \)
|
| $31$ |
\( (T^{2} + 67347060540)^{2} \)
|
| $37$ |
\( T^{4} \)
|
| $41$ |
\( T^{4} \)
|
| $43$ |
\( T^{4} \)
|
| $47$ |
\( (T^{2} + 136130004972)^{2} \)
|
| $53$ |
\( (T^{2} - 3136620967220)^{2} \)
|
| $59$ |
\( T^{4} \)
|
| $61$ |
\( (T - 2774518)^{4} \)
|
| $67$ |
\( T^{4} \)
|
| $71$ |
\( T^{4} \)
|
| $73$ |
\( T^{4} \)
|
| $79$ |
\( (T^{2} + 16072721340)^{2} \)
|
| $83$ |
\( (T^{2} + 102814481167788)^{2} \)
|
| $89$ |
\( T^{4} \)
|
| $97$ |
\( T^{4} \)
|
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