Properties

Label 768.4.d.r
Level $768$
Weight $4$
Character orbit 768.d
Analytic conductor $45.313$
Analytic rank $0$
Dimension $4$
CM no
Inner twists $2$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [768,4,Mod(385,768)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(768, base_ring=CyclotomicField(2))
 
chi = DirichletCharacter(H, H._module([0, 1, 0]))
 
N = Newforms(chi, 4, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("768.385");
 
S:= CuspForms(chi, 4);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 768 = 2^{8} \cdot 3 \)
Weight: \( k \) \(=\) \( 4 \)
Character orbit: \([\chi]\) \(=\) 768.d (of order \(2\), degree \(1\), not 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: \(45.3134668844\)
Analytic rank: \(0\)
Dimension: \(4\)
Coefficient field: \(\Q(i, \sqrt{7})\)
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{4} - 3x^{2} + 4 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{11}]\)
Coefficient ring index: \( 2^{6} \)
Twist minimal: no (minimal twist has level 384)
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 \(1,\beta_1,\beta_2,\beta_3\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + 3 \beta_1 q^{3} + ( - \beta_{3} - 8 \beta_1) q^{5} + (3 \beta_{2} - 2) q^{7} - 9 q^{9}+O(q^{10}) \) Copy content Toggle raw display \( q + 3 \beta_1 q^{3} + ( - \beta_{3} - 8 \beta_1) q^{5} + (3 \beta_{2} - 2) q^{7} - 9 q^{9} + (2 \beta_{3} - 12 \beta_1) q^{11} + (4 \beta_{3} + 38 \beta_1) q^{13} + (3 \beta_{2} + 24) q^{15} + ( - 2 \beta_{2} - 10) q^{17} + (10 \beta_{3} - 16 \beta_1) q^{19} + (9 \beta_{3} - 6 \beta_1) q^{21} + ( - 2 \beta_{2} - 36) q^{23} + ( - 16 \beta_{2} - 51) q^{25} - 27 \beta_1 q^{27} + ( - 5 \beta_{3} + 220 \beta_1) q^{29} + (5 \beta_{2} + 218) q^{31} + ( - 6 \beta_{2} + 36) q^{33} + ( - 22 \beta_{3} - 320 \beta_1) q^{35} + (6 \beta_{3} + 94 \beta_1) q^{37} + ( - 12 \beta_{2} - 114) q^{39} + (38 \beta_{2} + 2) q^{41} + (2 \beta_{3} + 296 \beta_1) q^{43} + (9 \beta_{3} + 72 \beta_1) q^{45} + ( - 26 \beta_{2} + 212) q^{47} + ( - 12 \beta_{2} + 669) q^{49} + ( - 6 \beta_{3} - 30 \beta_1) q^{51} + ( - 39 \beta_{3} - 204 \beta_1) q^{53} + (4 \beta_{2} + 128) q^{55} + ( - 30 \beta_{2} + 48) q^{57} + ( - 24 \beta_{3} + 116 \beta_1) q^{59} + ( - 10 \beta_{3} + 306 \beta_1) q^{61} + ( - 27 \beta_{2} + 18) q^{63} + (70 \beta_{2} + 752) q^{65} + ( - 8 \beta_{3} - 492 \beta_1) q^{67} + ( - 6 \beta_{3} - 108 \beta_1) q^{69} + ( - 2 \beta_{2} - 284) q^{71} + (36 \beta_{2} - 182) q^{73} + ( - 48 \beta_{3} - 153 \beta_1) q^{75} + ( - 40 \beta_{3} + 696 \beta_1) q^{77} + (61 \beta_{2} - 310) q^{79} + 81 q^{81} + (78 \beta_{3} + 156 \beta_1) q^{83} + (26 \beta_{3} + 304 \beta_1) q^{85} + (15 \beta_{2} - 660) q^{87} + ( - 60 \beta_{2} + 686) q^{89} + (106 \beta_{3} + 1268 \beta_1) q^{91} + (15 \beta_{3} + 654 \beta_1) q^{93} + (64 \beta_{2} + 992) q^{95} + ( - 20 \beta_{2} + 890) q^{97} + ( - 18 \beta_{3} + 108 \beta_1) q^{99}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 4 q - 8 q^{7} - 36 q^{9}+O(q^{10}) \) Copy content Toggle raw display \( 4 q - 8 q^{7} - 36 q^{9} + 96 q^{15} - 40 q^{17} - 144 q^{23} - 204 q^{25} + 872 q^{31} + 144 q^{33} - 456 q^{39} + 8 q^{41} + 848 q^{47} + 2676 q^{49} + 512 q^{55} + 192 q^{57} + 72 q^{63} + 3008 q^{65} - 1136 q^{71} - 728 q^{73} - 1240 q^{79} + 324 q^{81} - 2640 q^{87} + 2744 q^{89} + 3968 q^{95} + 3560 q^{97}+O(q^{100}) \) Copy content Toggle raw display

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

\(\beta_{1}\)\(=\) \( ( \nu^{3} - \nu ) / 2 \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( -2\nu^{3} + 10\nu \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( 8\nu^{2} - 12 \) Copy content Toggle raw display
\(\nu\)\(=\) \( ( \beta_{2} + 4\beta_1 ) / 8 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( ( \beta_{3} + 12 ) / 8 \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( ( \beta_{2} + 20\beta_1 ) / 8 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/768\mathbb{Z}\right)^\times\).

\(n\) \(257\) \(511\) \(517\)
\(\chi(n)\) \(1\) \(1\) \(-1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
385.1
−1.32288 0.500000i
1.32288 0.500000i
1.32288 + 0.500000i
−1.32288 + 0.500000i
0 3.00000i 0 2.58301i 0 −33.7490 0 −9.00000 0
385.2 0 3.00000i 0 18.5830i 0 29.7490 0 −9.00000 0
385.3 0 3.00000i 0 18.5830i 0 29.7490 0 −9.00000 0
385.4 0 3.00000i 0 2.58301i 0 −33.7490 0 −9.00000 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
8.b even 2 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 768.4.d.r 4
4.b odd 2 1 768.4.d.s 4
8.b even 2 1 inner 768.4.d.r 4
8.d odd 2 1 768.4.d.s 4
16.e even 4 1 384.4.a.i 2
16.e even 4 1 384.4.a.p yes 2
16.f odd 4 1 384.4.a.l yes 2
16.f odd 4 1 384.4.a.m yes 2
48.i odd 4 1 1152.4.a.n 2
48.i odd 4 1 1152.4.a.x 2
48.k even 4 1 1152.4.a.m 2
48.k even 4 1 1152.4.a.w 2
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
384.4.a.i 2 16.e even 4 1
384.4.a.l yes 2 16.f odd 4 1
384.4.a.m yes 2 16.f odd 4 1
384.4.a.p yes 2 16.e even 4 1
768.4.d.r 4 1.a even 1 1 trivial
768.4.d.r 4 8.b even 2 1 inner
768.4.d.s 4 4.b odd 2 1
768.4.d.s 4 8.d odd 2 1
1152.4.a.m 2 48.k even 4 1
1152.4.a.n 2 48.i odd 4 1
1152.4.a.w 2 48.k even 4 1
1152.4.a.x 2 48.i odd 4 1

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(768, [\chi])\):

\( T_{5}^{4} + 352T_{5}^{2} + 2304 \) Copy content Toggle raw display
\( T_{7}^{2} + 4T_{7} - 1004 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{4} \) Copy content Toggle raw display
$3$ \( (T^{2} + 9)^{2} \) Copy content Toggle raw display
$5$ \( T^{4} + 352T^{2} + 2304 \) Copy content Toggle raw display
$7$ \( (T^{2} + 4 T - 1004)^{2} \) Copy content Toggle raw display
$11$ \( T^{4} + 1184 T^{2} + 92416 \) Copy content Toggle raw display
$13$ \( T^{4} + 6472 T^{2} + 121104 \) Copy content Toggle raw display
$17$ \( (T^{2} + 20 T - 348)^{2} \) Copy content Toggle raw display
$19$ \( T^{4} + 22912 T^{2} + 119771136 \) Copy content Toggle raw display
$23$ \( (T^{2} + 72 T + 848)^{2} \) Copy content Toggle raw display
$29$ \( T^{4} + \cdots + 2079360000 \) Copy content Toggle raw display
$31$ \( (T^{2} - 436 T + 44724)^{2} \) Copy content Toggle raw display
$37$ \( T^{4} + 25736 T^{2} + 23078416 \) Copy content Toggle raw display
$41$ \( (T^{2} - 4 T - 161724)^{2} \) Copy content Toggle raw display
$43$ \( T^{4} + \cdots + 7598260224 \) Copy content Toggle raw display
$47$ \( (T^{2} - 424 T - 30768)^{2} \) Copy content Toggle raw display
$53$ \( T^{4} + \cdots + 16572957696 \) Copy content Toggle raw display
$59$ \( T^{4} + \cdots + 2606715136 \) Copy content Toggle raw display
$61$ \( T^{4} + \cdots + 6795694096 \) Copy content Toggle raw display
$67$ \( T^{4} + \cdots + 55176130816 \) Copy content Toggle raw display
$71$ \( (T^{2} + 568 T + 80208)^{2} \) Copy content Toggle raw display
$73$ \( (T^{2} + 364 T - 112028)^{2} \) Copy content Toggle raw display
$79$ \( (T^{2} + 620 T - 320652)^{2} \) Copy content Toggle raw display
$83$ \( T^{4} + \cdots + 431743613184 \) Copy content Toggle raw display
$89$ \( (T^{2} - 1372 T + 67396)^{2} \) Copy content Toggle raw display
$97$ \( (T^{2} - 1780 T + 747300)^{2} \) Copy content Toggle raw display
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