Properties

Label 775.2.f.d
Level $775$
Weight $2$
Character orbit 775.f
Analytic conductor $6.188$
Analytic rank $0$
Dimension $8$
CM discriminant -155
Inner twists $8$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [775,2,Mod(557,775)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(775, base_ring=CyclotomicField(4))
 
chi = DirichletCharacter(H, H._module([1, 2]))
 
N = Newforms(chi, 2, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("775.557");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 775 = 5^{2} \cdot 31 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 775.f (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: \(6.18840615665\)
Analytic rank: \(0\)
Dimension: \(8\)
Relative dimension: \(4\) over \(\Q(i)\)
Coefficient field: 8.0.94568550400.2
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} - 4x^{7} + 20x^{6} - 46x^{5} + 95x^{4} - 118x^{3} + 104x^{2} - 52x + 10 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{9}]\)
Coefficient ring index: \( 2^{6} \)
Twist minimal: yes
Sato-Tate group: $\mathrm{U}(1)[D_{4}]$

$q$-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.

\(f(q)\) \(=\) \( q + \beta_{3} q^{3} + 2 \beta_{4} q^{4} + ( - \beta_{7} - 3 \beta_{4}) q^{9}+O(q^{10}) \) Copy content Toggle raw display \( q + \beta_{3} q^{3} + 2 \beta_{4} q^{4} + ( - \beta_{7} - 3 \beta_{4}) q^{9} + 2 \beta_{2} q^{12} - \beta_{6} q^{13} - 4 q^{16} + (\beta_{5} + \beta_{2}) q^{17} - \beta_{7} q^{19} + (\beta_{6} + 2 \beta_{3}) q^{23} + ( - \beta_{5} - 5 \beta_{2}) q^{27} - \beta_1 q^{31} + ( - 2 \beta_1 + 6) q^{36} + ( - \beta_{5} + 3 \beta_{2}) q^{37} + ( - \beta_{7} - \beta_{4}) q^{39} - 3 q^{41} + (\beta_{6} - 3 \beta_{3}) q^{43} - 4 \beta_{3} q^{48} + 7 \beta_{4} q^{49} + ( - 2 \beta_1 + 7) q^{51} + 2 \beta_{5} q^{52} + ( - 2 \beta_{6} - \beta_{3}) q^{53} + ( - \beta_{5} - 5 \beta_{2}) q^{57} + 9 \beta_{4} q^{59} - 8 \beta_{4} q^{64} + (2 \beta_{6} - 2 \beta_{3}) q^{68} + ( - \beta_{7} - 11 \beta_{4}) q^{69} + 3 \beta_1 q^{71} + (2 \beta_{6} + 3 \beta_{3}) q^{73} - 2 \beta_1 q^{76} + (3 \beta_1 - 22) q^{81} + ( - \beta_{6} - 5 \beta_{3}) q^{83} + ( - 2 \beta_{5} + 4 \beta_{2}) q^{92} + ( - \beta_{6} + 5 \beta_{3}) q^{93}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q+O(q^{10}) \) Copy content Toggle raw display \( 8 q - 32 q^{16} + 48 q^{36} - 24 q^{41} + 56 q^{51} - 176 q^{81}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{8} - 4x^{7} + 20x^{6} - 46x^{5} + 95x^{4} - 118x^{3} + 104x^{2} - 52x + 10 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( ( -\nu^{6} + 3\nu^{5} - 14\nu^{4} + 23\nu^{3} - 25\nu^{2} + 14\nu + 25 ) / 5 \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( ( -7\nu^{7} + 23\nu^{6} - 124\nu^{5} + 239\nu^{4} - 511\nu^{3} + 518\nu^{2} - 418\nu + 125 ) / 15 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( 7\nu^{7} - 26\nu^{6} + 133\nu^{5} - 281\nu^{4} + 580\nu^{3} - 623\nu^{2} + 490\nu - 155 ) / 15 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( ( 14\nu^{7} - 49\nu^{6} + 257\nu^{5} - 520\nu^{4} + 1091\nu^{3} - 1141\nu^{2} + 938\nu - 295 ) / 15 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( ( 26\nu^{7} - 89\nu^{6} + 467\nu^{5} - 922\nu^{4} + 1913\nu^{3} - 1929\nu^{2} + 1524\nu - 450 ) / 5 \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( ( 26\nu^{7} - 93\nu^{6} + 479\nu^{5} - 988\nu^{4} + 2025\nu^{3} - 2159\nu^{2} + 1700\nu - 540 ) / 5 \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( ( -16\nu^{7} + 56\nu^{6} - 292\nu^{5} + 590\nu^{4} - 1228\nu^{3} + 1280\nu^{2} - 1048\nu + 329 ) / 3 \) Copy content Toggle raw display
\(\nu\)\(=\) \( ( \beta_{4} - \beta_{3} + \beta_{2} + 1 ) / 2 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( ( \beta_{4} - 2\beta_{3} + \beta _1 - 6 ) / 2 \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( ( -3\beta_{7} - \beta_{6} - \beta_{5} - 17\beta_{4} + 8\beta_{3} - 14\beta_{2} + 3\beta _1 - 19 ) / 4 \) Copy content Toggle raw display
\(\nu^{4}\)\(=\) \( ( -3\beta_{7} - 2\beta_{6} - 18\beta_{4} + 22\beta_{3} - 2\beta_{2} - 6\beta _1 + 33 ) / 2 \) Copy content Toggle raw display
\(\nu^{5}\)\(=\) \( ( 25\beta_{7} + \beta_{6} + 11\beta_{5} + 137\beta_{4} - 6\beta_{3} + 116\beta_{2} - 35\beta _1 + 197 ) / 4 \) Copy content Toggle raw display
\(\nu^{6}\)\(=\) \( ( 45\beta_{7} + 18\beta_{6} + 5\beta_{5} + 251\beta_{4} - 189\beta_{3} + 55\beta_{2} + 31\beta _1 - 171 ) / 2 \) Copy content Toggle raw display
\(\nu^{7}\)\(=\) \( ( -133\beta_{7} + 37\beta_{6} - 89\beta_{5} - 737\beta_{4} - 394\beta_{3} - 936\beta_{2} + 343\beta _1 - 1909 ) / 4 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/775\mathbb{Z}\right)^\times\).

\(n\) \(251\) \(652\)
\(\chi(n)\) \(-1\) \(-\beta_{4}\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
557.1
0.500000 + 1.90497i
0.500000 0.0351153i
0.500000 0.964885i
0.500000 2.90497i
0.500000 1.90497i
0.500000 + 0.0351153i
0.500000 + 0.964885i
0.500000 + 2.90497i
0 −2.40497 2.40497i 2.00000i 0 0 0 0 8.56776i 0
557.2 0 −0.464885 0.464885i 2.00000i 0 0 0 0 2.56776i 0
557.3 0 0.464885 + 0.464885i 2.00000i 0 0 0 0 2.56776i 0
557.4 0 2.40497 + 2.40497i 2.00000i 0 0 0 0 8.56776i 0
743.1 0 −2.40497 + 2.40497i 2.00000i 0 0 0 0 8.56776i 0
743.2 0 −0.464885 + 0.464885i 2.00000i 0 0 0 0 2.56776i 0
743.3 0 0.464885 0.464885i 2.00000i 0 0 0 0 2.56776i 0
743.4 0 2.40497 2.40497i 2.00000i 0 0 0 0 8.56776i 0
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 557.4
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
155.c odd 2 1 CM by \(\Q(\sqrt{-155}) \)
5.b even 2 1 inner
5.c odd 4 2 inner
31.b odd 2 1 inner
155.f even 4 2 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 775.2.f.d 8
5.b even 2 1 inner 775.2.f.d 8
5.c odd 4 2 inner 775.2.f.d 8
31.b odd 2 1 inner 775.2.f.d 8
155.c odd 2 1 CM 775.2.f.d 8
155.f even 4 2 inner 775.2.f.d 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
775.2.f.d 8 1.a even 1 1 trivial
775.2.f.d 8 5.b even 2 1 inner
775.2.f.d 8 5.c odd 4 2 inner
775.2.f.d 8 31.b odd 2 1 inner
775.2.f.d 8 155.c odd 2 1 CM
775.2.f.d 8 155.f even 4 2 inner

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(775, [\chi])\):

\( T_{2} \) Copy content Toggle raw display
\( T_{3}^{8} + 134T_{3}^{4} + 25 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{8} \) Copy content Toggle raw display
$3$ \( T^{8} + 134T^{4} + 25 \) Copy content Toggle raw display
$5$ \( T^{8} \) Copy content Toggle raw display
$7$ \( T^{8} \) Copy content Toggle raw display
$11$ \( T^{8} \) Copy content Toggle raw display
$13$ \( T^{8} + 2344 T^{4} + 32400 \) Copy content Toggle raw display
$17$ \( T^{8} + 2374 T^{4} + 1265625 \) Copy content Toggle raw display
$19$ \( (T^{2} + 31)^{4} \) Copy content Toggle raw display
$23$ \( T^{8} + 5224 T^{4} + 2624400 \) Copy content Toggle raw display
$29$ \( T^{8} \) Copy content Toggle raw display
$31$ \( (T^{2} - 31)^{4} \) Copy content Toggle raw display
$37$ \( T^{8} + 11014 T^{4} + 29648025 \) Copy content Toggle raw display
$41$ \( (T + 3)^{8} \) Copy content Toggle raw display
$43$ \( T^{8} + 22294 T^{4} + 13286025 \) Copy content Toggle raw display
$47$ \( T^{8} \) Copy content Toggle raw display
$53$ \( T^{8} + 44854 T^{4} + 2025 \) Copy content Toggle raw display
$59$ \( (T^{2} + 81)^{4} \) Copy content Toggle raw display
$61$ \( T^{8} \) Copy content Toggle raw display
$67$ \( T^{8} \) Copy content Toggle raw display
$71$ \( (T^{2} - 279)^{4} \) Copy content Toggle raw display
$73$ \( T^{8} + 65014 T^{4} + 102515625 \) Copy content Toggle raw display
$79$ \( T^{8} \) Copy content Toggle raw display
$83$ \( T^{8} + 62614 T^{4} + 566678025 \) Copy content Toggle raw display
$89$ \( T^{8} \) Copy content Toggle raw display
$97$ \( T^{8} \) Copy content Toggle raw display
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