↑

Properties

Label 1638.2.x.b
Level $1638$
Weight $2$
Character orbit 1638.x
Analytic conductor $13.079$
Analytic rank $0$
Dimension $8$
CM no
Inner twists $2$

Related objects

Downloads

Learn more

Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [1638,2,Mod(307,1638)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(1638, base_ring=CyclotomicField(4))
 
chi = DirichletCharacter(H, H._module([0, 2, 1]))
 
N = Newforms(chi, 2, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("1638.307");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 1638 = 2 \cdot 3^{2} \cdot 7 \cdot 13 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 1638.x (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: \(13.0794958511\)
Analytic rank: \(0\)
Dimension: \(8\)
Relative dimension: \(4\) over \(\Q(i)\)
Coefficient field: 8.0.7442857984.4
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} + 26x^{6} + 205x^{4} + 540x^{2} + 324 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{5}]\)
Coefficient ring index: \( 1 \)
Twist minimal: no (minimal twist has level 546)
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 \(1,\beta_1,\ldots,\beta_{7}\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q - \beta_{4} q^{2} - \beta_{6} q^{4} + (\beta_{7} - \beta_{3} - \beta_1 - 1) q^{5} + ( - \beta_{7} - \beta_{5} + \beta_1 + 1) q^{7} - \beta_{2} q^{8}+O(q^{10}) \) Copy content Toggle raw display \( q - \beta_{4} q^{2} - \beta_{6} q^{4} + (\beta_{7} - \beta_{3} - \beta_1 - 1) q^{5} + ( - \beta_{7} - \beta_{5} + \beta_1 + 1) q^{7} - \beta_{2} q^{8} + ( - \beta_{7} - \beta_{5} + \cdots + \beta_1) q^{10}+ \cdots + (6 \beta_{6} + \beta_{5} + \cdots - \beta_1) q^{98}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q - 4 q^{5} + 4 q^{7}+O(q^{10}) \) Copy content Toggle raw display \( 8 q - 4 q^{5} + 4 q^{7} - 4 q^{10} + 8 q^{11} - 16 q^{13} - 8 q^{16} - 12 q^{17} - 4 q^{19} - 4 q^{20} + 4 q^{22} + 12 q^{29} - 20 q^{31} + 24 q^{34} - 32 q^{35} - 8 q^{37} + 12 q^{38} + 16 q^{41} + 8 q^{44} - 20 q^{46} - 16 q^{47} + 4 q^{49} - 24 q^{50} + 24 q^{52} + 24 q^{53} - 4 q^{56} - 16 q^{58} + 28 q^{59} + 20 q^{65} + 8 q^{67} + 24 q^{70} - 52 q^{71} + 8 q^{73} + 4 q^{74} - 4 q^{76} + 32 q^{77} - 48 q^{79} + 4 q^{80} - 40 q^{82} + 32 q^{83} + 20 q^{85} + 20 q^{86} + 4 q^{89} - 8 q^{91} - 20 q^{92} + 36 q^{97}+O(q^{100}) \) Copy content Toggle raw display

Display 100 coefficients 10 coefficients

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{8} + 26x^{6} + 205x^{4} + 540x^{2} + 324 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( \nu \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( ( 2\nu^{7} + 3\nu^{6} + 52\nu^{5} + 60\nu^{4} + 374\nu^{3} + 219\nu^{2} + 612\nu - 162 ) / 432 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( -\nu^{7} + 3\nu^{6} - 8\nu^{5} + 24\nu^{4} + 155\nu^{3} - 249\nu^{2} + 774\nu - 810 ) / 432 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( ( 2\nu^{7} - 3\nu^{6} + 52\nu^{5} - 60\nu^{4} + 374\nu^{3} - 219\nu^{2} + 612\nu + 162 ) / 432 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( ( -\nu^{7} - 3\nu^{6} - 8\nu^{5} - 24\nu^{4} + 155\nu^{3} + 249\nu^{2} + 1206\nu + 810 ) / 432 \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( ( -5\nu^{7} - 112\nu^{5} - 665\nu^{3} - 954\nu ) / 432 \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( ( \nu^{6} + 20\nu^{4} + 97\nu^{2} + 114 ) / 24 \) Copy content Toggle raw display

Display \(\nu^j\) in terms of \(\beta_i\)

\(\nu\)\(=\) \( \beta_1 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( \beta_{7} + 3\beta_{4} - 3\beta_{2} - 7 \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( -6\beta_{6} + 3\beta_{5} - 6\beta_{4} + 3\beta_{3} - 6\beta_{2} - 10\beta_1 \) Copy content Toggle raw display
\(\nu^{4}\)\(=\) \( -13\beta_{7} + 6\beta_{5} - 45\beta_{4} - 6\beta_{3} + 45\beta_{2} - 6\beta _1 + 73 \) Copy content Toggle raw display
\(\nu^{5}\)\(=\) \( 114\beta_{6} - 45\beta_{5} + 120\beta_{4} - 45\beta_{3} + 120\beta_{2} + 118\beta_1 \) Copy content Toggle raw display
\(\nu^{6}\)\(=\) \( 187\beta_{7} - 120\beta_{5} + 609\beta_{4} + 120\beta_{3} - 609\beta_{2} + 120\beta _1 - 895 \) Copy content Toggle raw display
\(\nu^{7}\)\(=\) \( -1842\beta_{6} + 609\beta_{5} - 1890\beta_{4} + 609\beta_{3} - 1890\beta_{2} - 1504\beta_1 \) Copy content Toggle raw display

Display \(\beta_i\) in terms of \(\nu^j\)

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/1638\mathbb{Z}\right)^\times\).

\(n\) \(379\) \(703\) \(911\)
\(\chi(n)\) \(-\beta_{6}\) \(-1\) \(1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
307.1
− 1.91681i
0.916813i
− 3.73923i
2.73923i
1.91681i
− 0.916813i
3.73923i
− 2.73923i
−0.707107 − 0.707107i 0 1.00000i −2.56510 + 2.56510i 0 2.56510 + 0.648285i 0.707107 − 0.707107i 0 3.62760
307.2 −0.707107 − 0.707107i 0 1.00000i 2.27220 − 2.27220i 0 −2.27220 − 1.35539i 0.707107 − 0.707107i 0 −3.21338
307.3 0.707107 + 0.707107i 0 1.00000i −1.80230 + 1.80230i 0 1.80230 − 1.93693i −0.707107 + 0.707107i 0 −2.54884
307.4 0.707107 + 0.707107i 0 1.00000i 0.0951965 − 0.0951965i 0 −0.0951965 + 2.64404i −0.707107 + 0.707107i 0 0.134628
811.1 −0.707107 + 0.707107i 0 − 1.00000i −2.56510 − 2.56510i 0 2.56510 − 0.648285i 0.707107 + 0.707107i 0 3.62760
811.2 −0.707107 + 0.707107i 0 − 1.00000i 2.27220 + 2.27220i 0 −2.27220 + 1.35539i 0.707107 + 0.707107i 0 −3.21338
811.3 0.707107 − 0.707107i 0 − 1.00000i −1.80230 − 1.80230i 0 1.80230 + 1.93693i −0.707107 − 0.707107i 0 −2.54884
811.4 0.707107 − 0.707107i 0 − 1.00000i 0.0951965 + 0.0951965i 0 −0.0951965 − 2.64404i −0.707107 − 0.707107i 0 0.134628
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 307.4
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
91.i even 4 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 1638.2.x.b 8
3.b odd 2 1 546.2.o.d yes 8
7.b odd 2 1 1638.2.x.d 8
13.d odd 4 1 1638.2.x.d 8
21.c even 2 1 546.2.o.a ✓ 8
39.f even 4 1 546.2.o.a ✓ 8
91.i even 4 1 inner 1638.2.x.b 8
273.o odd 4 1 546.2.o.d yes 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
546.2.o.a ✓ 8 21.c even 2 1
546.2.o.a ✓ 8 39.f even 4 1
546.2.o.d yes 8 3.b odd 2 1
546.2.o.d yes 8 273.o odd 4 1
1638.2.x.b 8 1.a even 1 1 trivial
1638.2.x.b 8 91.i even 4 1 inner
1638.2.x.d 8 7.b odd 2 1
1638.2.x.d 8 13.d odd 4 1

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{5}^{8} + 4T_{5}^{7} + 8T_{5}^{6} - 4T_{5}^{5} + 113T_{5}^{4} + 424T_{5}^{3} + 800T_{5}^{2} - 160T_{5} + 16 \) acting on \(S_{2}^{\mathrm{new}}(1638, [\chi])\). Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( (T^{4} + 1)^{2} \) Copy content Toggle raw display
$3$ \( T^{8} \) Copy content Toggle raw display
$5$ \( T^{8} + 4 T^{7} + \cdots + 16 \) Copy content Toggle raw display
$7$ \( T^{8} - 4 T^{7} + \cdots + 2401 \) Copy content Toggle raw display
$11$ \( T^{8} - 8 T^{7} + \cdots + 64 \) Copy content Toggle raw display
$13$ \( (T^{2} + 4 T + 13)^{4} \) Copy content Toggle raw display
$17$ \( (T^{4} + 6 T^{3} - 35 T^{2} + \cdots - 92)^{2} \) Copy content Toggle raw display
$19$ \( T^{8} + 4 T^{7} + \cdots + 777924 \) Copy content Toggle raw display
$23$ \( T^{8} + 102 T^{6} + \cdots + 135424 \) Copy content Toggle raw display
$29$ \( (T^{4} - 6 T^{3} + \cdots + 356)^{2} \) Copy content Toggle raw display
$31$ \( T^{8} + 20 T^{7} + \cdots + 5184 \) Copy content Toggle raw display
$37$ \( T^{8} + 8 T^{7} + \cdots + 777924 \) Copy content Toggle raw display
$41$ \( T^{8} - 16 T^{7} + \cdots + 3936256 \) Copy content Toggle raw display
$43$ \( T^{8} + 254 T^{6} + \cdots + 14961424 \) Copy content Toggle raw display
$47$ \( T^{8} + 16 T^{7} + \cdots + 65536 \) Copy content Toggle raw display
$53$ \( (T^{4} - 12 T^{3} + \cdots + 128)^{2} \) Copy content Toggle raw display
$59$ \( T^{8} - 28 T^{7} + \cdots + 73984 \) Copy content Toggle raw display
$61$ \( T^{8} + 106 T^{6} + \cdots + 8464 \) Copy content Toggle raw display
$67$ \( T^{8} - 8 T^{7} + \cdots + 16 \) Copy content Toggle raw display
$71$ \( T^{8} + 52 T^{7} + \cdots + 1327104 \) Copy content Toggle raw display
$73$ \( T^{8} - 8 T^{7} + \cdots + 777924 \) Copy content Toggle raw display
$79$ \( (T^{4} + 24 T^{3} + \cdots - 20744)^{2} \) Copy content Toggle raw display
$83$ \( T^{8} - 32 T^{7} + \cdots + 541696 \) Copy content Toggle raw display
$89$ \( T^{8} - 4 T^{7} + \cdots + 45050944 \) Copy content Toggle raw display
$97$ \( T^{8} - 36 T^{7} + \cdots + 485409024 \) Copy content Toggle raw display
show more
show less