Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [4928,2,Mod(1,4928)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(4928, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 0, 0]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("4928.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 4928 = 2^{6} \cdot 7 \cdot 11 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 4928.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: | \(39.3502781161\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | 4.4.11348.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} - 5x^{2} + x + 2 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 2^{2} \) |
| Twist minimal: | no (minimal twist has level 616) |
| 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 \(1,\beta_1,\beta_2,\beta_3\) 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
\( x^{4} - x^{3} - 5x^{2} + x + 2 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu^{3} - \nu^{2} - 3\nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{3} - \nu^{2} - 5\nu + 1 \)
|
| \(\beta_{3}\) | \(=\) |
\( 2\nu^{2} - 2\nu - 5 \)
|
| \(\nu\) | \(=\) |
\( ( -\beta_{2} + \beta _1 + 1 ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{3} - \beta_{2} + \beta _1 + 6 ) / 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( \beta_{3} - 4\beta_{2} + 6\beta _1 + 9 ) / 2 \)
|
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 | −2.76342 | 0 | −3.31593 | 0 | 1.00000 | 0 | 4.63646 | 0 | ||||||||||||||||||||||||||||||
| 1.2 | 0 | −0.757235 | 0 | 2.52514 | 0 | 1.00000 | 0 | −2.42659 | 0 | |||||||||||||||||||||||||||||||
| 1.3 | 0 | 1.12631 | 0 | −4.42512 | 0 | 1.00000 | 0 | −1.73143 | 0 | |||||||||||||||||||||||||||||||
| 1.4 | 0 | 3.39434 | 0 | 0.215911 | 0 | 1.00000 | 0 | 8.52156 | 0 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \( -1 \) |
| \(7\) | \( -1 \) |
| \(11\) | \( -1 \) |
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 | 4928.2.a.ch | 4 | |
| 4.b | odd | 2 | 1 | 4928.2.a.cc | 4 | ||
| 8.b | even | 2 | 1 | 1232.2.a.s | 4 | ||
| 8.d | odd | 2 | 1 | 616.2.a.h | ✓ | 4 | |
| 24.f | even | 2 | 1 | 5544.2.a.bm | 4 | ||
| 56.e | even | 2 | 1 | 4312.2.a.z | 4 | ||
| 56.h | odd | 2 | 1 | 8624.2.a.cy | 4 | ||
| 88.g | even | 2 | 1 | 6776.2.a.bb | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 616.2.a.h | ✓ | 4 | 8.d | odd | 2 | 1 | |
| 1232.2.a.s | 4 | 8.b | even | 2 | 1 | ||
| 4312.2.a.z | 4 | 56.e | even | 2 | 1 | ||
| 4928.2.a.cc | 4 | 4.b | odd | 2 | 1 | ||
| 4928.2.a.ch | 4 | 1.a | even | 1 | 1 | trivial | |
| 5544.2.a.bm | 4 | 24.f | even | 2 | 1 | ||
| 6776.2.a.bb | 4 | 88.g | even | 2 | 1 | ||
| 8624.2.a.cy | 4 | 56.h | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(4928))\):
|
\( T_{3}^{4} - T_{3}^{3} - 10T_{3}^{2} + 4T_{3} + 8 \)
|
|
\( T_{5}^{4} + 5T_{5}^{3} - 6T_{5}^{2} - 36T_{5} + 8 \)
|
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\( T_{13}^{4} + 4T_{13}^{3} - 32T_{13}^{2} - 80T_{13} + 256 \)
|
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\( T_{17}^{4} - 10T_{17}^{3} + 16T_{17}^{2} + 32T_{17} - 32 \)
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\( T_{19}^{4} - 6T_{19}^{3} - 48T_{19}^{2} + 320T_{19} - 448 \)
|
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\( T_{23}^{4} - 3T_{23}^{3} - 52T_{23}^{2} - 48T_{23} + 64 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} - T^{3} - 10 T^{2} + \cdots + 8 \)
|
| $5$ |
\( T^{4} + 5 T^{3} + \cdots + 8 \)
|
| $7$ |
\( (T - 1)^{4} \)
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| $11$ |
\( (T - 1)^{4} \)
|
| $13$ |
\( T^{4} + 4 T^{3} + \cdots + 256 \)
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| $17$ |
\( T^{4} - 10 T^{3} + \cdots - 32 \)
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| $19$ |
\( T^{4} - 6 T^{3} + \cdots - 448 \)
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| $23$ |
\( T^{4} - 3 T^{3} + \cdots + 64 \)
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| $29$ |
\( T^{4} - 4 T^{3} + \cdots + 304 \)
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| $31$ |
\( T^{4} + T^{3} + \cdots + 152 \)
|
| $37$ |
\( T^{4} + 13 T^{3} + \cdots + 56 \)
|
| $41$ |
\( T^{4} - 10 T^{3} + \cdots - 32 \)
|
| $43$ |
\( T^{4} + 8 T^{3} + \cdots + 1792 \)
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| $47$ |
\( T^{4} - 6 T^{3} + \cdots - 256 \)
|
| $53$ |
\( (T + 2)^{4} \)
|
| $59$ |
\( T^{4} - 3 T^{3} + \cdots + 3032 \)
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| $61$ |
\( T^{4} + 2 T^{3} + \cdots - 224 \)
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| $67$ |
\( T^{4} - 3 T^{3} + \cdots + 128 \)
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| $71$ |
\( T^{4} + 7 T^{3} + \cdots - 64 \)
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| $73$ |
\( T^{4} - 2 T^{3} + \cdots + 5408 \)
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| $79$ |
\( T^{4} - 46 T^{3} + \cdots + 12032 \)
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| $83$ |
\( T^{4} - 32 T^{3} + \cdots - 3584 \)
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| $89$ |
\( T^{4} - 7 T^{3} + \cdots - 1816 \)
|
| $97$ |
\( T^{4} + 11 T^{3} + \cdots - 2872 \)
|
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