Properties

Label 308.2.t.b
Level $308$
Weight $2$
Character orbit 308.t
Analytic conductor $2.459$
Analytic rank $0$
Dimension $8$
CM discriminant -7
Inner twists $4$

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Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [308,2,Mod(27,308)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(308, base_ring=CyclotomicField(10))
 
chi = DirichletCharacter(H, H._module([5, 5, 4]))
 
N = Newforms(chi, 2, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("308.27");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 308 = 2^{2} \cdot 7 \cdot 11 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 308.t (of order \(10\), degree \(4\), 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: \(2.45939238226\)
Analytic rank: \(0\)
Dimension: \(8\)
Relative dimension: \(2\) over \(\Q(\zeta_{10})\)
Coefficient field: 8.0.37515625.1
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} - x^{7} - x^{6} + 3x^{5} - x^{4} + 6x^{3} - 4x^{2} - 8x + 16 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{7}]\)
Coefficient ring index: \( 1 \)
Twist minimal: yes
Sato-Tate group: $\mathrm{U}(1)[D_{10}]$

$q$-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 \(1,\beta_1,\ldots,\beta_{7}\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q - \beta_{2} q^{2} + ( - \beta_{7} - \beta_{6} + \beta_{5} + \cdots + 1) q^{4}+ \cdots + ( - 3 \beta_{7} + 3 \beta_{5} + \cdots + 3) q^{9}+O(q^{10}) \) Copy content Toggle raw display \( q - \beta_{2} q^{2} + ( - \beta_{7} - \beta_{6} + \beta_{5} + \cdots + 1) q^{4}+ \cdots + (6 \beta_{6} + 3) q^{99}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q + q^{2} + 3 q^{4} - 5 q^{8} + 6 q^{9}+O(q^{10}) \) Copy content Toggle raw display \( 8 q + q^{2} + 3 q^{4} - 5 q^{8} + 6 q^{9} + 4 q^{11} - 7 q^{14} - q^{16} + 12 q^{18} + 5 q^{22} - 10 q^{25} - 28 q^{28} + 4 q^{29} - 44 q^{32} - 9 q^{36} + 18 q^{37} - 13 q^{44} - 14 q^{46} + 14 q^{49} + 5 q^{50} - 30 q^{53} + 7 q^{56} + 73 q^{58} - 9 q^{64} + 80 q^{71} + 15 q^{72} + 6 q^{74} - 14 q^{77} - 40 q^{79} - 18 q^{81} + 9 q^{86} + 3 q^{88} + 39 q^{92} - 7 q^{98} + 48 q^{99}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{8} - x^{7} - x^{6} + 3x^{5} - x^{4} + 6x^{3} - 4x^{2} - 8x + 16 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( \nu \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( ( \nu^{7} - \nu^{6} - \nu^{5} + 3\nu^{4} - \nu^{3} + 6\nu^{2} - 4\nu - 8 ) / 8 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( -\nu^{7} - \nu^{6} + 3\nu^{5} - \nu^{4} + 3\nu^{3} - 4\nu^{2} - 8\nu + 16 ) / 8 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( ( -\nu^{7} - 3\nu^{2} ) / 4 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( ( -\nu^{7} - 7\nu^{2} ) / 4 \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( -\nu^{5} - 5 \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( ( -3\nu^{7} + 3\nu^{6} + 3\nu^{5} - \nu^{4} + 3\nu^{3} - 18\nu^{2} + 12\nu + 24 ) / 8 \) Copy content Toggle raw display
\(\nu\)\(=\) \( \beta_1 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( -\beta_{5} + \beta_{4} \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( \beta_{7} + \beta_{6} - \beta_{5} - \beta_{4} + 2\beta_{3} + \beta_{2} + \beta _1 - 1 \) Copy content Toggle raw display
\(\nu^{4}\)\(=\) \( \beta_{7} + 3\beta_{2} \) Copy content Toggle raw display
\(\nu^{5}\)\(=\) \( -\beta_{6} - 5 \) Copy content Toggle raw display
\(\nu^{6}\)\(=\) \( 2\beta_{7} - 2\beta_{5} - 2\beta_{3} - 5\beta _1 - 2 \) Copy content Toggle raw display
\(\nu^{7}\)\(=\) \( 3\beta_{5} - 7\beta_{4} \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/308\mathbb{Z}\right)^\times\).

\(n\) \(45\) \(57\) \(155\)
\(\chi(n)\) \(-1\) \(\beta_{5}\) \(-1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
27.1
−1.41264 0.0667372i
1.10362 0.884319i
−0.373058 1.36412i
1.18208 + 0.776336i
−1.41264 + 0.0667372i
1.10362 + 0.884319i
−0.373058 + 1.36412i
1.18208 0.776336i
−1.41264 + 0.0667372i 0 1.99109 0.188551i 0 0 −1.55513 2.14046i −2.80011 + 0.399234i −0.927051 2.85317i 0
27.2 1.10362 + 0.884319i 0 0.435959 + 1.95191i 0 0 1.55513 + 2.14046i −1.24498 + 2.53969i −0.927051 2.85317i 0
223.1 −0.373058 + 1.36412i 0 −1.72166 1.01779i 0 0 2.51626 + 0.817582i 2.03067 1.96885i 2.42705 1.76336i 0
223.2 1.18208 0.776336i 0 0.794604 1.83538i 0 0 −2.51626 0.817582i −0.485587 2.78643i 2.42705 1.76336i 0
251.1 −1.41264 0.0667372i 0 1.99109 + 0.188551i 0 0 −1.55513 + 2.14046i −2.80011 0.399234i −0.927051 + 2.85317i 0
251.2 1.10362 0.884319i 0 0.435959 1.95191i 0 0 1.55513 2.14046i −1.24498 2.53969i −0.927051 + 2.85317i 0
279.1 −0.373058 1.36412i 0 −1.72166 + 1.01779i 0 0 2.51626 0.817582i 2.03067 + 1.96885i 2.42705 + 1.76336i 0
279.2 1.18208 + 0.776336i 0 0.794604 + 1.83538i 0 0 −2.51626 + 0.817582i −0.485587 + 2.78643i 2.42705 + 1.76336i 0
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 27.2
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
7.b odd 2 1 CM by \(\Q(\sqrt{-7}) \)
44.h odd 10 1 inner
308.t even 10 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 308.2.t.b yes 8
4.b odd 2 1 308.2.t.a 8
7.b odd 2 1 CM 308.2.t.b yes 8
11.c even 5 1 308.2.t.a 8
28.d even 2 1 308.2.t.a 8
44.h odd 10 1 inner 308.2.t.b yes 8
77.j odd 10 1 308.2.t.a 8
308.t even 10 1 inner 308.2.t.b yes 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
308.2.t.a 8 4.b odd 2 1
308.2.t.a 8 11.c even 5 1
308.2.t.a 8 28.d even 2 1
308.2.t.a 8 77.j odd 10 1
308.2.t.b yes 8 1.a even 1 1 trivial
308.2.t.b yes 8 7.b odd 2 1 CM
308.2.t.b yes 8 44.h odd 10 1 inner
308.2.t.b yes 8 308.t even 10 1 inner

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(308, [\chi])\):

\( T_{3} \) Copy content Toggle raw display
\( T_{71}^{8} - 80 T_{71}^{7} + 2887 T_{71}^{6} - 61440 T_{71}^{5} + 842534 T_{71}^{4} - 7566480 T_{71}^{3} + \cdots + 257570401 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{8} - T^{7} + \cdots + 16 \) Copy content Toggle raw display
$3$ \( T^{8} \) Copy content Toggle raw display
$5$ \( T^{8} \) Copy content Toggle raw display
$7$ \( T^{8} - 7 T^{6} + \cdots + 2401 \) Copy content Toggle raw display
$11$ \( T^{8} - 4 T^{7} + \cdots + 14641 \) Copy content Toggle raw display
$13$ \( T^{8} \) Copy content Toggle raw display
$17$ \( T^{8} \) Copy content Toggle raw display
$19$ \( T^{8} \) Copy content Toggle raw display
$23$ \( T^{8} + 202 T^{6} + \cdots + 43681 \) Copy content Toggle raw display
$29$ \( T^{8} - 4 T^{7} + \cdots + 13256881 \) Copy content Toggle raw display
$31$ \( T^{8} \) Copy content Toggle raw display
$37$ \( T^{8} - 18 T^{7} + \cdots + 2193361 \) Copy content Toggle raw display
$41$ \( T^{8} \) Copy content Toggle raw display
$43$ \( T^{8} + 402 T^{6} + \cdots + 16072081 \) Copy content Toggle raw display
$47$ \( T^{8} \) Copy content Toggle raw display
$53$ \( T^{8} + 30 T^{7} + \cdots + 6027025 \) Copy content Toggle raw display
$59$ \( T^{8} \) Copy content Toggle raw display
$61$ \( T^{8} \) Copy content Toggle raw display
$67$ \( T^{8} + 418 T^{6} + \cdots + 2337841 \) Copy content Toggle raw display
$71$ \( T^{8} - 80 T^{7} + \cdots + 257570401 \) Copy content Toggle raw display
$73$ \( T^{8} \) Copy content Toggle raw display
$79$ \( T^{8} + 40 T^{7} + \cdots + 23338561 \) Copy content Toggle raw display
$83$ \( T^{8} \) Copy content Toggle raw display
$89$ \( T^{8} \) Copy content Toggle raw display
$97$ \( T^{8} \) Copy content Toggle raw display
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