Properties

Label 320.4.f.b
Level $320$
Weight $4$
Character orbit 320.f
Analytic conductor $18.881$
Analytic rank $0$
Dimension $8$
CM no
Inner twists $8$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [320,4,Mod(289,320)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(320, base_ring=CyclotomicField(2))
 
chi = DirichletCharacter(H, H._module([0, 1, 1]))
 
N = Newforms(chi, 4, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("320.289");
 
S:= CuspForms(chi, 4);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 320 = 2^{6} \cdot 5 \)
Weight: \( k \) \(=\) \( 4 \)
Character orbit: \([\chi]\) \(=\) 320.f (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: \(18.8806112018\)
Analytic rank: \(0\)
Dimension: \(8\)
Coefficient field: 8.0.11462287360000.3
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} - 17x^{4} + 2401 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{11}]\)
Coefficient ring index: \( 2^{10}\cdot 5^{2} \)
Twist minimal: yes
Sato-Tate group: $\mathrm{SU}(2)[C_{2}]$

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

\(f(q)\) \(=\) \( q - \beta_{5} q^{3} + \beta_{2} q^{5} + \beta_{3} q^{7} + 19 q^{9}+O(q^{10}) \) Copy content Toggle raw display \( q - \beta_{5} q^{3} + \beta_{2} q^{5} + \beta_{3} q^{7} + 19 q^{9} + 17 \beta_1 q^{11} + ( - 2 \beta_{7} + 2 \beta_{2}) q^{13} + (\beta_{4} + 5 \beta_{3}) q^{15} + \beta_{6} q^{17} - 29 \beta_1 q^{19} + (\beta_{7} + 9 \beta_{2}) q^{21} + 3 \beta_{3} q^{23} + (5 \beta_{6} - 105) q^{25} + 8 \beta_{5} q^{27} + (2 \beta_{7} + 18 \beta_{2}) q^{29} + (10 \beta_{4} + 4 \beta_{3}) q^{31} - 17 \beta_{6} q^{33} + (25 \beta_{5} - 25 \beta_1) q^{35} + (11 \beta_{7} - 11 \beta_{2}) q^{37} + (20 \beta_{4} + 8 \beta_{3}) q^{39} + 84 q^{41} - 65 \beta_{5} q^{43} + 19 \beta_{2} q^{45} - 21 \beta_{3} q^{47} + 93 q^{49} - 46 \beta_1 q^{51} + (20 \beta_{7} - 20 \beta_{2}) q^{53} + 17 \beta_{4} q^{55} + 29 \beta_{6} q^{57} + 327 \beta_1 q^{59} + (5 \beta_{7} + 45 \beta_{2}) q^{61} + 19 \beta_{3} q^{63} + (50 \beta_{6} + 200) q^{65} + 57 \beta_{5} q^{67} + (3 \beta_{7} + 27 \beta_{2}) q^{69} + (30 \beta_{4} + 12 \beta_{3}) q^{71} - 87 \beta_{6} q^{73} + (105 \beta_{5} - 230 \beta_1) q^{75} + ( - 17 \beta_{7} + 17 \beta_{2}) q^{77} + ( - 10 \beta_{4} - 4 \beta_{3}) q^{79} - 881 q^{81} - 179 \beta_{5} q^{83} + (5 \beta_{7} - \beta_{2}) q^{85} + 92 \beta_{3} q^{87} + 718 q^{89} - 500 \beta_1 q^{91} + ( - 46 \beta_{7} + 46 \beta_{2}) q^{93} - 29 \beta_{4} q^{95} - 5 \beta_{6} q^{97} + 323 \beta_1 q^{99}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q + 152 q^{9}+O(q^{10}) \) Copy content Toggle raw display \( 8 q + 152 q^{9} - 840 q^{25} + 672 q^{41} + 744 q^{49} + 1600 q^{65} - 7048 q^{81} + 5744 q^{89}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{8} - 17x^{4} + 2401 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( ( 2\nu^{6} + 64\nu^{2} ) / 441 \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( ( 2\nu^{7} + 49\nu^{5} + 686\nu^{4} - 377\nu^{3} - 1519\nu - 5831 ) / 3087 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( -10\nu^{7} + 245\nu^{5} + 1885\nu^{3} - 7595\nu ) / 3087 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( ( 4\nu^{7} + 126\nu^{6} - 98\nu^{5} - 754\nu^{3} - 8316\nu^{2} + 3038\nu ) / 3087 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( ( 16\nu^{7} - 49\nu^{5} + 71\nu^{3} - 4655\nu ) / 3087 \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( ( -32\nu^{7} - 98\nu^{5} - 142\nu^{3} - 9310\nu ) / 3087 \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( ( -18\nu^{7} - 441\nu^{5} + 686\nu^{4} + 3393\nu^{3} + 13671\nu - 5831 ) / 3087 \) Copy content Toggle raw display
\(\nu\)\(=\) \( ( \beta_{7} - 5\beta_{6} - 10\beta_{5} - 2\beta_{3} - \beta_{2} ) / 40 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( ( -5\beta_{4} - 2\beta_{3} + 45\beta_1 ) / 20 \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( ( 8\beta_{7} - 5\beta_{6} + 10\beta_{5} + 16\beta_{3} - 8\beta_{2} ) / 20 \) Copy content Toggle raw display
\(\nu^{4}\)\(=\) \( ( 9\beta_{7} + 81\beta_{2} + 170 ) / 20 \) Copy content Toggle raw display
\(\nu^{5}\)\(=\) \( ( -19\beta_{7} - 31\beta_{6} - 62\beta_{5} + 38\beta_{3} + 19\beta_{2} ) / 8 \) Copy content Toggle raw display
\(\nu^{6}\)\(=\) \( ( 80\beta_{4} + 32\beta_{3} + 1485\beta_1 ) / 10 \) Copy content Toggle raw display
\(\nu^{7}\)\(=\) \( ( -71\beta_{7} - 1885\beta_{6} + 3770\beta_{5} - 142\beta_{3} + 71\beta_{2} ) / 40 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/320\mathbb{Z}\right)^\times\).

\(n\) \(191\) \(257\) \(261\)
\(\chi(n)\) \(1\) \(-1\) \(-1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
289.1
−0.905013 2.48615i
−0.905013 + 2.48615i
−2.48615 + 0.905013i
−2.48615 0.905013i
2.48615 0.905013i
2.48615 + 0.905013i
0.905013 + 2.48615i
0.905013 2.48615i
0 −6.78233 0 −3.16228 10.7238i 0 15.8114i 0 19.0000 0
289.2 0 −6.78233 0 −3.16228 + 10.7238i 0 15.8114i 0 19.0000 0
289.3 0 −6.78233 0 3.16228 10.7238i 0 15.8114i 0 19.0000 0
289.4 0 −6.78233 0 3.16228 + 10.7238i 0 15.8114i 0 19.0000 0
289.5 0 6.78233 0 −3.16228 10.7238i 0 15.8114i 0 19.0000 0
289.6 0 6.78233 0 −3.16228 + 10.7238i 0 15.8114i 0 19.0000 0
289.7 0 6.78233 0 3.16228 10.7238i 0 15.8114i 0 19.0000 0
289.8 0 6.78233 0 3.16228 + 10.7238i 0 15.8114i 0 19.0000 0
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 289.8
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
4.b odd 2 1 inner
5.b even 2 1 inner
8.b even 2 1 inner
8.d odd 2 1 inner
20.d odd 2 1 inner
40.e odd 2 1 inner
40.f even 2 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 320.4.f.b 8
4.b odd 2 1 inner 320.4.f.b 8
5.b even 2 1 inner 320.4.f.b 8
8.b even 2 1 inner 320.4.f.b 8
8.d odd 2 1 inner 320.4.f.b 8
20.d odd 2 1 inner 320.4.f.b 8
40.e odd 2 1 inner 320.4.f.b 8
40.f even 2 1 inner 320.4.f.b 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
320.4.f.b 8 1.a even 1 1 trivial
320.4.f.b 8 4.b odd 2 1 inner
320.4.f.b 8 5.b even 2 1 inner
320.4.f.b 8 8.b even 2 1 inner
320.4.f.b 8 8.d odd 2 1 inner
320.4.f.b 8 20.d odd 2 1 inner
320.4.f.b 8 40.e odd 2 1 inner
320.4.f.b 8 40.f even 2 1 inner

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{3}^{2} - 46 \) acting on \(S_{4}^{\mathrm{new}}(320, [\chi])\). Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{8} \) Copy content Toggle raw display
$3$ \( (T^{2} - 46)^{4} \) Copy content Toggle raw display
$5$ \( (T^{4} + 210 T^{2} + 15625)^{2} \) Copy content Toggle raw display
$7$ \( (T^{2} + 250)^{4} \) Copy content Toggle raw display
$11$ \( (T^{2} + 1156)^{4} \) Copy content Toggle raw display
$13$ \( (T^{2} - 4000)^{4} \) Copy content Toggle raw display
$17$ \( (T^{2} + 184)^{4} \) Copy content Toggle raw display
$19$ \( (T^{2} + 3364)^{4} \) Copy content Toggle raw display
$23$ \( (T^{2} + 2250)^{4} \) Copy content Toggle raw display
$29$ \( (T^{2} + 46000)^{4} \) Copy content Toggle raw display
$31$ \( (T^{2} - 46000)^{4} \) Copy content Toggle raw display
$37$ \( (T^{2} - 121000)^{4} \) Copy content Toggle raw display
$41$ \( (T - 84)^{8} \) Copy content Toggle raw display
$43$ \( (T^{2} - 194350)^{4} \) Copy content Toggle raw display
$47$ \( (T^{2} + 110250)^{4} \) Copy content Toggle raw display
$53$ \( (T^{2} - 400000)^{4} \) Copy content Toggle raw display
$59$ \( (T^{2} + 427716)^{4} \) Copy content Toggle raw display
$61$ \( (T^{2} + 287500)^{4} \) Copy content Toggle raw display
$67$ \( (T^{2} - 149454)^{4} \) Copy content Toggle raw display
$71$ \( (T^{2} - 414000)^{4} \) Copy content Toggle raw display
$73$ \( (T^{2} + 1392696)^{4} \) Copy content Toggle raw display
$79$ \( (T^{2} - 46000)^{4} \) Copy content Toggle raw display
$83$ \( (T^{2} - 1473886)^{4} \) Copy content Toggle raw display
$89$ \( (T - 718)^{8} \) Copy content Toggle raw display
$97$ \( (T^{2} + 4600)^{4} \) Copy content Toggle raw display
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