Properties

Label 208.2.k.b
Level $208$
Weight $2$
Character orbit 208.k
Analytic conductor $1.661$
Analytic rank $0$
Dimension $12$
CM no
Inner twists $4$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [208,2,Mod(31,208)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(208, base_ring=CyclotomicField(4))
 
chi = DirichletCharacter(H, H._module([2, 0, 3]))
 
N = Newforms(chi, 2, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("208.31");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 208 = 2^{4} \cdot 13 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 208.k (of order \(4\), degree \(2\), 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: \(1.66088836204\)
Analytic rank: \(0\)
Dimension: \(12\)
Relative dimension: \(6\) over \(\Q(i)\)
Coefficient field: \(\mathbb{Q}[x]/(x^{12} + \cdots)\)
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{12} + 14x^{10} + 147x^{8} + 662x^{6} + 2233x^{4} + 588x^{2} + 144 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{7}]\)
Coefficient ring index: \( 2^{7} \)
Twist minimal: yes
Sato-Tate group: $\mathrm{SU}(2)[C_{4}]$

$q$-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 \(1,\beta_1,\ldots,\beta_{11}\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + \beta_{2} q^{3} - \beta_{6} q^{5} - \beta_{11} q^{7} + ( - \beta_1 - 2) q^{9}+O(q^{10}) \) Copy content Toggle raw display \( q + \beta_{2} q^{3} - \beta_{6} q^{5} - \beta_{11} q^{7} + ( - \beta_1 - 2) q^{9} - \beta_{8} q^{11} + (\beta_{9} + \beta_{6}) q^{13} + (\beta_{10} - \beta_{7} + \cdots + \beta_{2}) q^{15}+ \cdots + ( - 2 \beta_{11} + \beta_{8} + \cdots + \beta_{2}) q^{99}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 12 q + 4 q^{5} - 20 q^{9}+O(q^{10}) \) Copy content Toggle raw display \( 12 q + 4 q^{5} - 20 q^{9} - 4 q^{13} - 8 q^{21} + 8 q^{29} + 52 q^{37} + 36 q^{41} - 36 q^{45} - 8 q^{53} - 56 q^{57} - 56 q^{61} - 28 q^{65} + 4 q^{73} - 4 q^{81} + 32 q^{85} + 20 q^{89} + 56 q^{93} - 4 q^{97}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{12} + 14x^{10} + 147x^{8} + 662x^{6} + 2233x^{4} + 588x^{2} + 144 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( ( 4\nu^{10} + 42\nu^{8} + 441\nu^{6} + 638\nu^{4} + 168\nu^{2} - 30891 ) / 6531 \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( ( 14\nu^{10} + 147\nu^{8} + 1699\nu^{6} + 6587\nu^{4} + 31066\nu^{2} + 4308 ) / 13062 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( -49\nu^{11} - 670\nu^{9} - 7035\nu^{7} - 30674\nu^{5} - 106865\nu^{3} - 2016\nu ) / 26124 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( ( \nu^{11} + 14\nu^{9} + 147\nu^{7} + 674\nu^{5} + 2317\nu^{3} + 1176\nu ) / 504 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( ( - 391 \nu^{11} + 132 \nu^{10} - 5816 \nu^{9} + 1386 \nu^{8} - 62001 \nu^{7} + 11754 \nu^{6} + \cdots - 221688 ) / 156744 \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( ( - 391 \nu^{11} - 132 \nu^{10} - 5816 \nu^{9} - 1386 \nu^{8} - 62001 \nu^{7} - 11754 \nu^{6} + \cdots + 221688 ) / 156744 \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( ( 343 \nu^{11} - 196 \nu^{10} + 4690 \nu^{9} - 2680 \nu^{8} + 49245 \nu^{7} - 28140 \nu^{6} + \cdots - 60312 ) / 52248 \) Copy content Toggle raw display
\(\beta_{8}\)\(=\) \( ( - 343 \nu^{11} - 196 \nu^{10} - 4690 \nu^{9} - 2680 \nu^{8} - 49245 \nu^{7} - 28140 \nu^{6} + \cdots - 60312 ) / 52248 \) Copy content Toggle raw display
\(\beta_{9}\)\(=\) \( ( 1387\nu^{11} + 20006\nu^{9} + 211929\nu^{7} + 995150\nu^{5} + 3413011\nu^{3} + 1732200\nu ) / 156744 \) Copy content Toggle raw display
\(\beta_{10}\)\(=\) \( ( 609 \nu^{11} - 348 \nu^{10} + 8416 \nu^{9} - 4898 \nu^{8} + 87435 \nu^{7} - 51118 \nu^{6} + \cdots - 104952 ) / 52248 \) Copy content Toggle raw display
\(\beta_{11}\)\(=\) \( ( - 609 \nu^{11} - 348 \nu^{10} - 8416 \nu^{9} - 4898 \nu^{8} - 87435 \nu^{7} - 51118 \nu^{6} + \cdots - 104952 ) / 52248 \) Copy content Toggle raw display
\(\nu\)\(=\) \( ( \beta_{9} + \beta_{6} + \beta_{5} - \beta_{4} + \beta_{3} ) / 2 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( ( \beta_{11} + \beta_{10} - 2\beta_{8} - 2\beta_{7} - \beta_{2} - \beta _1 - 5 ) / 2 \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( \beta_{8} - \beta_{7} - 7\beta_{3} \) Copy content Toggle raw display
\(\nu^{4}\)\(=\) \( ( -7\beta_{11} - 7\beta_{10} + 14\beta_{8} + 14\beta_{7} - 2\beta_{6} + 2\beta_{5} + 13\beta_{2} - 9\beta _1 - 37 ) / 2 \) Copy content Toggle raw display
\(\nu^{5}\)\(=\) \( ( 2 \beta_{11} - 2 \beta_{10} - 55 \beta_{9} - 11 \beta_{8} + 11 \beta_{7} - 49 \beta_{6} + \cdots + 51 \beta_{3} ) / 2 \) Copy content Toggle raw display
\(\nu^{6}\)\(=\) \( 28\beta_{6} - 28\beta_{5} + 77\beta _1 + 285 \) Copy content Toggle raw display
\(\nu^{7}\)\(=\) \( ( 28 \beta_{11} - 28 \beta_{10} + 439 \beta_{9} - 105 \beta_{8} + 105 \beta_{7} + 355 \beta_{6} + \cdots + 383 \beta_{3} ) / 2 \) Copy content Toggle raw display
\(\nu^{8}\)\(=\) \( ( 355 \beta_{11} + 355 \beta_{10} - 794 \beta_{8} - 794 \beta_{7} - 294 \beta_{6} + 294 \beta_{5} + \cdots - 2237 ) / 2 \) Copy content Toggle raw display
\(\nu^{9}\)\(=\) \( -294\beta_{11} + 294\beta_{10} + 943\beta_{8} - 943\beta_{7} - 2947\beta_{3} \) Copy content Toggle raw display
\(\nu^{10}\)\(=\) \( ( - 2653 \beta_{11} - 2653 \beta_{10} + 6188 \beta_{8} + 6188 \beta_{7} - 2768 \beta_{6} + 2768 \beta_{5} + \cdots - 17797 ) / 2 \) Copy content Toggle raw display
\(\nu^{11}\)\(=\) \( ( 2768 \beta_{11} - 2768 \beta_{10} - 28639 \beta_{9} - 8189 \beta_{8} + 8189 \beta_{7} + \cdots + 23103 \beta_{3} ) / 2 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/208\mathbb{Z}\right)^\times\).

\(n\) \(53\) \(79\) \(145\)
\(\chi(n)\) \(1\) \(-1\) \(-\beta_{4}\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
31.1
−1.43257 2.48129i
−1.17542 + 2.03589i
−0.257153 + 0.445402i
0.257153 + 0.445402i
1.17542 + 2.03589i
1.43257 2.48129i
1.43257 + 2.48129i
1.17542 2.03589i
0.257153 0.445402i
−0.257153 0.445402i
−1.17542 2.03589i
−1.43257 + 2.48129i
0 2.86514i 0 −0.376763 + 0.376763i 0 2.21257 2.21257i 0 −5.20905 0
31.2 0 2.35084i 0 2.79911 2.79911i 0 −2.49735 + 2.49735i 0 −2.52644 0
31.3 0 0.514306i 0 −1.42234 + 1.42234i 0 2.97788 2.97788i 0 2.73549 0
31.4 0 0.514306i 0 −1.42234 + 1.42234i 0 −2.97788 + 2.97788i 0 2.73549 0
31.5 0 2.35084i 0 2.79911 2.79911i 0 2.49735 2.49735i 0 −2.52644 0
31.6 0 2.86514i 0 −0.376763 + 0.376763i 0 −2.21257 + 2.21257i 0 −5.20905 0
47.1 0 2.86514i 0 −0.376763 0.376763i 0 −2.21257 2.21257i 0 −5.20905 0
47.2 0 2.35084i 0 2.79911 + 2.79911i 0 2.49735 + 2.49735i 0 −2.52644 0
47.3 0 0.514306i 0 −1.42234 1.42234i 0 −2.97788 2.97788i 0 2.73549 0
47.4 0 0.514306i 0 −1.42234 1.42234i 0 2.97788 + 2.97788i 0 2.73549 0
47.5 0 2.35084i 0 2.79911 + 2.79911i 0 −2.49735 2.49735i 0 −2.52644 0
47.6 0 2.86514i 0 −0.376763 0.376763i 0 2.21257 + 2.21257i 0 −5.20905 0
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 31.6
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
4.b odd 2 1 inner
13.d odd 4 1 inner
52.f even 4 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 208.2.k.b 12
3.b odd 2 1 1872.2.bf.o 12
4.b odd 2 1 inner 208.2.k.b 12
8.b even 2 1 832.2.k.j 12
8.d odd 2 1 832.2.k.j 12
12.b even 2 1 1872.2.bf.o 12
13.d odd 4 1 inner 208.2.k.b 12
39.f even 4 1 1872.2.bf.o 12
52.f even 4 1 inner 208.2.k.b 12
104.j odd 4 1 832.2.k.j 12
104.m even 4 1 832.2.k.j 12
156.l odd 4 1 1872.2.bf.o 12
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
208.2.k.b 12 1.a even 1 1 trivial
208.2.k.b 12 4.b odd 2 1 inner
208.2.k.b 12 13.d odd 4 1 inner
208.2.k.b 12 52.f even 4 1 inner
832.2.k.j 12 8.b even 2 1
832.2.k.j 12 8.d odd 2 1
832.2.k.j 12 104.j odd 4 1
832.2.k.j 12 104.m even 4 1
1872.2.bf.o 12 3.b odd 2 1
1872.2.bf.o 12 12.b even 2 1
1872.2.bf.o 12 39.f even 4 1
1872.2.bf.o 12 156.l odd 4 1

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{3}^{6} + 14T_{3}^{4} + 49T_{3}^{2} + 12 \) acting on \(S_{2}^{\mathrm{new}}(208, [\chi])\). Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{12} \) Copy content Toggle raw display
$3$ \( (T^{6} + 14 T^{4} + \cdots + 12)^{2} \) Copy content Toggle raw display
$5$ \( (T^{6} - 2 T^{5} + 2 T^{4} + \cdots + 18)^{2} \) Copy content Toggle raw display
$7$ \( T^{12} + 566 T^{8} + \cdots + 4691556 \) Copy content Toggle raw display
$11$ \( (T^{4} + 36)^{3} \) Copy content Toggle raw display
$13$ \( (T^{6} + 2 T^{5} + \cdots + 2197)^{2} \) Copy content Toggle raw display
$17$ \( (T^{6} + 34 T^{4} + \cdots + 576)^{2} \) Copy content Toggle raw display
$19$ \( T^{12} + 1796 T^{8} + \cdots + 9216 \) Copy content Toggle raw display
$23$ \( (T^{6} - 132 T^{4} + \cdots - 62208)^{2} \) Copy content Toggle raw display
$29$ \( (T^{3} - 2 T^{2} + \cdots - 108)^{4} \) Copy content Toggle raw display
$31$ \( T^{12} + 1220 T^{8} + \cdots + 746496 \) Copy content Toggle raw display
$37$ \( (T^{6} - 26 T^{5} + \cdots + 32258)^{2} \) Copy content Toggle raw display
$41$ \( (T^{6} - 18 T^{5} + \cdots + 2592)^{2} \) Copy content Toggle raw display
$43$ \( (T^{6} - 50 T^{4} + \cdots - 432)^{2} \) Copy content Toggle raw display
$47$ \( T^{12} + \cdots + 82809270756 \) Copy content Toggle raw display
$53$ \( (T^{3} + 2 T^{2} - 18 T + 12)^{4} \) Copy content Toggle raw display
$59$ \( T^{12} + \cdots + 78364164096 \) Copy content Toggle raw display
$61$ \( (T^{3} + 14 T^{2} + \cdots - 456)^{4} \) Copy content Toggle raw display
$67$ \( T^{12} + 61868 T^{8} + \cdots + 576 \) Copy content Toggle raw display
$71$ \( T^{12} + \cdots + 82809270756 \) Copy content Toggle raw display
$73$ \( (T^{6} - 2 T^{5} + \cdots + 512)^{2} \) Copy content Toggle raw display
$79$ \( (T^{6} + 248 T^{4} + \cdots + 88752)^{2} \) Copy content Toggle raw display
$83$ \( (T^{4} + 2916)^{3} \) Copy content Toggle raw display
$89$ \( (T^{6} - 10 T^{5} + \cdots + 2592)^{2} \) Copy content Toggle raw display
$97$ \( (T^{6} + 2 T^{5} + \cdots + 7688)^{2} \) Copy content Toggle raw display
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