Properties

Label 640.2.f.f
Level $640$
Weight $2$
Character orbit 640.f
Analytic conductor $5.110$
Analytic rank $0$
Dimension $4$
CM discriminant -20
Inner twists $8$

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Newspace parameters

Level: \( N \) \(=\) \( 640 = 2^{7} \cdot 5 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 640.f (of order \(2\), degree \(1\), minimal)

Newform invariants

Self dual: no
Analytic conductor: \(5.11042572936\)
Analytic rank: \(0\)
Dimension: \(4\)
Coefficient field: \(\Q(\sqrt{-2}, \sqrt{-5})\)
Defining polynomial: \(x^{4} - 4 x^{2} + 9\)
Coefficient ring: \(\Z[a_1, \ldots, a_{7}]\)
Coefficient ring index: \( 2 \)
Twist minimal: yes
Sato-Tate group: $\mathrm{U}(1)[D_{2}]$

$q$-expansion

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.

\(f(q)\) \(=\) \( q -\beta_{3} q^{3} -\beta_{2} q^{5} -3 \beta_{1} q^{7} + 7 q^{9} +O(q^{10})\) \( q -\beta_{3} q^{3} -\beta_{2} q^{5} -3 \beta_{1} q^{7} + 7 q^{9} + 5 \beta_{1} q^{15} + 6 \beta_{2} q^{21} -\beta_{1} q^{23} -5 q^{25} -4 \beta_{3} q^{27} -4 \beta_{2} q^{29} -3 \beta_{3} q^{35} -12 q^{41} -\beta_{3} q^{43} -7 \beta_{2} q^{45} + 7 \beta_{1} q^{47} -11 q^{49} + 6 \beta_{2} q^{61} -21 \beta_{1} q^{63} + 5 \beta_{3} q^{67} + 2 \beta_{2} q^{69} + 5 \beta_{3} q^{75} + 19 q^{81} -3 \beta_{3} q^{83} + 20 \beta_{1} q^{87} -6 q^{89} +O(q^{100})\)
\(\operatorname{Tr}(f)(q)\) \(=\) \( 4q + 28q^{9} + O(q^{10}) \) \( 4q + 28q^{9} - 20q^{25} - 48q^{41} - 44q^{49} + 76q^{81} - 24q^{89} + O(q^{100}) \)

Basis of coefficient ring in terms of a root \(\nu\) of \(x^{4} - 4 x^{2} + 9\):

\(\beta_{0}\)\(=\)\( 1 \)
\(\beta_{1}\)\(=\)\((\)\( \nu^{3} - \nu \)\()/3\)
\(\beta_{2}\)\(=\)\( \nu^{2} - 2 \)
\(\beta_{3}\)\(=\)\((\)\( -\nu^{3} + 7 \nu \)\()/3\)
\(1\)\(=\)\(\beta_0\)
\(\nu\)\(=\)\((\)\(\beta_{3} + \beta_{1}\)\()/2\)
\(\nu^{2}\)\(=\)\(\beta_{2} + 2\)
\(\nu^{3}\)\(=\)\((\)\(\beta_{3} + 7 \beta_{1}\)\()/2\)

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/640\mathbb{Z}\right)^\times\).

\(n\) \(257\) \(261\) \(511\)
\(\chi(n)\) \(-1\) \(-1\) \(1\)

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.

Label \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
449.1
1.58114 + 0.707107i
1.58114 0.707107i
−1.58114 0.707107i
−1.58114 + 0.707107i
0 −3.16228 0 2.23607i 0 4.24264i 0 7.00000 0
449.2 0 −3.16228 0 2.23607i 0 4.24264i 0 7.00000 0
449.3 0 3.16228 0 2.23607i 0 4.24264i 0 7.00000 0
449.4 0 3.16228 0 2.23607i 0 4.24264i 0 7.00000 0
\(n\): e.g. 2-40 or 990-1000
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
20.d odd 2 1 CM by \(\Q(\sqrt{-5}) \)
4.b odd 2 1 inner
5.b even 2 1 inner
8.b even 2 1 inner
8.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 640.2.f.f 4
4.b odd 2 1 inner 640.2.f.f 4
5.b even 2 1 inner 640.2.f.f 4
5.c odd 4 2 3200.2.d.i 4
8.b even 2 1 inner 640.2.f.f 4
8.d odd 2 1 inner 640.2.f.f 4
16.e even 4 2 1280.2.c.f 4
16.f odd 4 2 1280.2.c.f 4
20.d odd 2 1 CM 640.2.f.f 4
20.e even 4 2 3200.2.d.i 4
40.e odd 2 1 inner 640.2.f.f 4
40.f even 2 1 inner 640.2.f.f 4
40.i odd 4 2 3200.2.d.i 4
40.k even 4 2 3200.2.d.i 4
80.i odd 4 2 6400.2.a.cv 4
80.j even 4 2 6400.2.a.cv 4
80.k odd 4 2 1280.2.c.f 4
80.q even 4 2 1280.2.c.f 4
80.s even 4 2 6400.2.a.cv 4
80.t odd 4 2 6400.2.a.cv 4
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
640.2.f.f 4 1.a even 1 1 trivial
640.2.f.f 4 4.b odd 2 1 inner
640.2.f.f 4 5.b even 2 1 inner
640.2.f.f 4 8.b even 2 1 inner
640.2.f.f 4 8.d odd 2 1 inner
640.2.f.f 4 20.d odd 2 1 CM
640.2.f.f 4 40.e odd 2 1 inner
640.2.f.f 4 40.f even 2 1 inner
1280.2.c.f 4 16.e even 4 2
1280.2.c.f 4 16.f odd 4 2
1280.2.c.f 4 80.k odd 4 2
1280.2.c.f 4 80.q even 4 2
3200.2.d.i 4 5.c odd 4 2
3200.2.d.i 4 20.e even 4 2
3200.2.d.i 4 40.i odd 4 2
3200.2.d.i 4 40.k even 4 2
6400.2.a.cv 4 80.i odd 4 2
6400.2.a.cv 4 80.j even 4 2
6400.2.a.cv 4 80.s even 4 2
6400.2.a.cv 4 80.t odd 4 2

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(640, [\chi])\):

\( T_{3}^{2} - 10 \)
\( T_{7}^{2} + 18 \)
\( T_{13} \)
\( T_{37} \)

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{4} \)
$3$ \( ( -10 + T^{2} )^{2} \)
$5$ \( ( 5 + T^{2} )^{2} \)
$7$ \( ( 18 + T^{2} )^{2} \)
$11$ \( T^{4} \)
$13$ \( T^{4} \)
$17$ \( T^{4} \)
$19$ \( T^{4} \)
$23$ \( ( 2 + T^{2} )^{2} \)
$29$ \( ( 80 + T^{2} )^{2} \)
$31$ \( T^{4} \)
$37$ \( T^{4} \)
$41$ \( ( 12 + T )^{4} \)
$43$ \( ( -10 + T^{2} )^{2} \)
$47$ \( ( 98 + T^{2} )^{2} \)
$53$ \( T^{4} \)
$59$ \( T^{4} \)
$61$ \( ( 180 + T^{2} )^{2} \)
$67$ \( ( -250 + T^{2} )^{2} \)
$71$ \( T^{4} \)
$73$ \( T^{4} \)
$79$ \( T^{4} \)
$83$ \( ( -90 + T^{2} )^{2} \)
$89$ \( ( 6 + T )^{4} \)
$97$ \( T^{4} \)
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