Properties

Label 845.2.f.b
Level $845$
Weight $2$
Character orbit 845.f
Analytic conductor $6.747$
Analytic rank $0$
Dimension $8$
Inner twists $2$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [845,2,Mod(408,845)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(845, base_ring=CyclotomicField(4))
 
chi = DirichletCharacter(H, H._module([3, 3]))
 
N = Newforms(chi, 2, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("845.408");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 845 = 5 \cdot 13^{2} \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 845.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: \(6.74735897080\)
Analytic rank: \(0\)
Dimension: \(8\)
Relative dimension: \(4\) over \(\Q(i)\)
Coefficient field: 8.0.619810816.2
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} - 2x^{5} + 14x^{4} - 8x^{3} + 2x^{2} + 2x + 1 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, a_2, a_3]\)
Coefficient ring index: \( 2 \)
Twist minimal: no (minimal twist has level 65)
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.

\(f(q)\) \(=\) \( q - \beta_{6} q^{2} + (\beta_{3} - \beta_{2} - 1) q^{3} + (\beta_{7} + \beta_{5} - \beta_{4} - 1) q^{4} + ( - \beta_{4} - \beta_1) q^{5} + (\beta_{6} + \beta_{4} - \beta_{2} + 1) q^{6} + (\beta_{7} + \beta_{5} + \cdots + 2 \beta_{3}) q^{7}+ \cdots + ( - \beta_{5} + \beta_{4} + \cdots - \beta_1) q^{9}+O(q^{10}) \) Copy content Toggle raw display \( q - \beta_{6} q^{2} + (\beta_{3} - \beta_{2} - 1) q^{3} + (\beta_{7} + \beta_{5} - \beta_{4} - 1) q^{4} + ( - \beta_{4} - \beta_1) q^{5} + (\beta_{6} + \beta_{4} - \beta_{2} + 1) q^{6} + (\beta_{7} + \beta_{5} + \cdots + 2 \beta_{3}) q^{7}+ \cdots + ( - \beta_{7} - \beta_1) q^{99}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q - 6 q^{3} - 8 q^{4} + 2 q^{5} + 6 q^{6}+O(q^{10}) \) Copy content Toggle raw display \( 8 q - 6 q^{3} - 8 q^{4} + 2 q^{5} + 6 q^{6} + 6 q^{10} - 6 q^{11} - 2 q^{12} - 2 q^{15} - 8 q^{16} + 16 q^{17} - 20 q^{18} + 14 q^{19} + 2 q^{20} + 12 q^{21} + 10 q^{22} - 14 q^{23} + 2 q^{24} - 12 q^{25} + 12 q^{27} + 8 q^{28} - 14 q^{30} - 2 q^{31} - 24 q^{35} + 44 q^{37} - 2 q^{38} + 22 q^{40} - 16 q^{41} + 24 q^{42} - 6 q^{43} + 10 q^{44} - 22 q^{45} - 2 q^{46} - 16 q^{47} - 14 q^{48} + 24 q^{49} - 44 q^{50} - 24 q^{53} - 20 q^{54} + 10 q^{55} - 24 q^{58} + 22 q^{59} + 10 q^{60} + 20 q^{61} - 30 q^{62} + 48 q^{64} - 36 q^{66} + 4 q^{68} + 4 q^{69} + 68 q^{70} + 10 q^{71} + 16 q^{72} + 30 q^{75} - 6 q^{76} - 24 q^{77} + 26 q^{80} - 20 q^{81} + 20 q^{82} - 48 q^{83} + 16 q^{84} - 32 q^{85} + 46 q^{86} + 16 q^{87} - 10 q^{88} - 28 q^{89} - 14 q^{90} + 50 q^{92} + 40 q^{93} + 2 q^{95} - 30 q^{96} - 2 q^{99}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{8} - 2x^{5} + 14x^{4} - 8x^{3} + 2x^{2} + 2x + 1 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( ( 64\nu^{7} + 16\nu^{6} + 4\nu^{5} - 127\nu^{4} + 944\nu^{3} - 276\nu^{2} + 378\nu + 63 ) / 319 \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( ( -63\nu^{7} + 64\nu^{6} + 16\nu^{5} + 130\nu^{4} - 1009\nu^{3} + 1448\nu^{2} - 402\nu - 67 ) / 319 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( -67\nu^{7} + 63\nu^{6} - 64\nu^{5} + 118\nu^{4} - 1068\nu^{3} + 1545\nu^{2} - 1263\nu + 268 ) / 319 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( ( 83\nu^{7} - 59\nu^{6} + 65\nu^{5} - 70\nu^{4} + 1304\nu^{3} - 1614\nu^{2} + 1198\nu + 306 ) / 319 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( ( -172\nu^{7} - 43\nu^{6} + 69\nu^{5} + 441\nu^{4} - 2218\nu^{3} + 662\nu^{2} + 619\nu - 269 ) / 319 \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( ( -196\nu^{7} - 49\nu^{6} - 92\nu^{5} + 369\nu^{4} - 2572\nu^{3} + 1244\nu^{2} - 1038\nu - 173 ) / 319 \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( \nu^{7} - 2\nu^{4} + 14\nu^{3} - 8\nu^{2} + \nu + 2 \) Copy content Toggle raw display
\(\nu\)\(=\) \( ( -\beta_{7} - \beta_{5} + \beta_{4} + \beta_1 ) / 2 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( \beta_{6} - \beta_{5} + \beta_{4} - \beta_{3} + 2\beta_{2} \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( ( 3\beta_{7} + 5\beta_{5} - 5\beta_{4} - 2\beta_{2} + 3\beta _1 + 2 ) / 2 \) Copy content Toggle raw display
\(\nu^{4}\)\(=\) \( -\beta_{7} - \beta_{5} + 5\beta_{4} + 4\beta_{3} - 7 \) Copy content Toggle raw display
\(\nu^{5}\)\(=\) \( ( 11\beta_{7} + 2\beta_{6} + 9\beta_{5} - 11\beta_{4} - 12\beta_{3} + 12\beta_{2} - 11\beta _1 + 12 ) / 2 \) Copy content Toggle raw display
\(\nu^{6}\)\(=\) \( -15\beta_{6} + 16\beta_{5} - 16\beta_{4} + 16\beta_{3} - 28\beta_{2} + 7\beta_1 \) Copy content Toggle raw display
\(\nu^{7}\)\(=\) \( ( -43\beta_{7} + 16\beta_{6} - 89\beta_{5} + 105\beta_{4} + 60\beta_{2} - 43\beta _1 - 60 ) / 2 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/845\mathbb{Z}\right)^\times\).

\(n\) \(171\) \(677\)
\(\chi(n)\) \(-\beta_{2}\) \(-\beta_{2}\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
408.1
1.18254 + 1.18254i
−0.252709 0.252709i
−1.49094 1.49094i
0.561103 + 0.561103i
0.561103 0.561103i
−1.49094 + 1.49094i
−0.252709 + 0.252709i
1.18254 1.18254i
2.31627i −0.240275 0.240275i −3.36509 1.55654 1.60536i −0.556540 + 0.556540i −3.95872 3.16190i 2.88454i −3.71844 3.60536i
408.2 1.57942i 0.725850 + 0.725850i −0.494582 −0.146426 + 2.23127i 1.14643 1.14643i 4.24997 2.37769i 1.94628i 3.52412 + 0.231269i
408.3 0.134632i −2.15558 2.15558i 1.98187 1.29021 + 1.82630i −0.290209 + 0.290209i −1.90970 0.536087i 6.29303i 0.245878 0.173703i
408.4 2.03032i −1.33000 1.33000i −2.12221 −1.70032 1.45220i 2.70032 2.70032i 1.61845 0.248119i 0.537789i 2.94844 3.45220i
437.1 2.03032i −1.33000 + 1.33000i −2.12221 −1.70032 + 1.45220i 2.70032 + 2.70032i 1.61845 0.248119i 0.537789i 2.94844 + 3.45220i
437.2 0.134632i −2.15558 + 2.15558i 1.98187 1.29021 1.82630i −0.290209 0.290209i −1.90970 0.536087i 6.29303i 0.245878 + 0.173703i
437.3 1.57942i 0.725850 0.725850i −0.494582 −0.146426 2.23127i 1.14643 + 1.14643i 4.24997 2.37769i 1.94628i 3.52412 0.231269i
437.4 2.31627i −0.240275 + 0.240275i −3.36509 1.55654 + 1.60536i −0.556540 0.556540i −3.95872 3.16190i 2.88454i −3.71844 + 3.60536i
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 408.4
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
65.f even 4 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 845.2.f.b 8
5.c odd 4 1 845.2.k.b 8
13.b even 2 1 65.2.f.b 8
13.c even 3 2 845.2.t.d 16
13.d odd 4 1 65.2.k.b yes 8
13.d odd 4 1 845.2.k.b 8
13.e even 6 2 845.2.t.c 16
13.f odd 12 2 845.2.o.c 16
13.f odd 12 2 845.2.o.d 16
39.d odd 2 1 585.2.n.e 8
39.f even 4 1 585.2.w.e 8
52.b odd 2 1 1040.2.cd.n 8
52.f even 4 1 1040.2.bg.n 8
65.d even 2 1 325.2.f.b 8
65.f even 4 1 325.2.f.b 8
65.f even 4 1 inner 845.2.f.b 8
65.g odd 4 1 325.2.k.b 8
65.h odd 4 1 65.2.k.b yes 8
65.h odd 4 1 325.2.k.b 8
65.k even 4 1 65.2.f.b 8
65.o even 12 2 845.2.t.c 16
65.q odd 12 2 845.2.o.c 16
65.r odd 12 2 845.2.o.d 16
65.t even 12 2 845.2.t.d 16
195.j odd 4 1 585.2.n.e 8
195.s even 4 1 585.2.w.e 8
260.p even 4 1 1040.2.bg.n 8
260.s odd 4 1 1040.2.cd.n 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
65.2.f.b 8 13.b even 2 1
65.2.f.b 8 65.k even 4 1
65.2.k.b yes 8 13.d odd 4 1
65.2.k.b yes 8 65.h odd 4 1
325.2.f.b 8 65.d even 2 1
325.2.f.b 8 65.f even 4 1
325.2.k.b 8 65.g odd 4 1
325.2.k.b 8 65.h odd 4 1
585.2.n.e 8 39.d odd 2 1
585.2.n.e 8 195.j odd 4 1
585.2.w.e 8 39.f even 4 1
585.2.w.e 8 195.s even 4 1
845.2.f.b 8 1.a even 1 1 trivial
845.2.f.b 8 65.f even 4 1 inner
845.2.k.b 8 5.c odd 4 1
845.2.k.b 8 13.d odd 4 1
845.2.o.c 16 13.f odd 12 2
845.2.o.c 16 65.q odd 12 2
845.2.o.d 16 13.f odd 12 2
845.2.o.d 16 65.r odd 12 2
845.2.t.c 16 13.e even 6 2
845.2.t.c 16 65.o even 12 2
845.2.t.d 16 13.c even 3 2
845.2.t.d 16 65.t even 12 2
1040.2.bg.n 8 52.f even 4 1
1040.2.bg.n 8 260.p even 4 1
1040.2.cd.n 8 52.b odd 2 1
1040.2.cd.n 8 260.s odd 4 1

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(845, [\chi])\):

\( T_{2}^{8} + 12T_{2}^{6} + 46T_{2}^{4} + 56T_{2}^{2} + 1 \) Copy content Toggle raw display
\( T_{7}^{4} - 20T_{7}^{2} - 4T_{7} + 52 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{8} + 12 T^{6} + \cdots + 1 \) Copy content Toggle raw display
$3$ \( T^{8} + 6 T^{7} + \cdots + 4 \) Copy content Toggle raw display
$5$ \( T^{8} - 2 T^{7} + \cdots + 625 \) Copy content Toggle raw display
$7$ \( (T^{4} - 20 T^{2} + \cdots + 52)^{2} \) Copy content Toggle raw display
$11$ \( T^{8} + 6 T^{7} + \cdots + 4 \) Copy content Toggle raw display
$13$ \( T^{8} \) Copy content Toggle raw display
$17$ \( T^{8} - 16 T^{7} + \cdots + 13456 \) Copy content Toggle raw display
$19$ \( T^{8} - 14 T^{7} + \cdots + 100 \) Copy content Toggle raw display
$23$ \( T^{8} + 14 T^{7} + \cdots + 40804 \) Copy content Toggle raw display
$29$ \( T^{8} + 44 T^{6} + \cdots + 10000 \) Copy content Toggle raw display
$31$ \( T^{8} + 2 T^{7} + \cdots + 16900 \) Copy content Toggle raw display
$37$ \( (T^{4} - 22 T^{3} + \cdots + 580)^{2} \) Copy content Toggle raw display
$41$ \( T^{8} + 16 T^{7} + \cdots + 13456 \) Copy content Toggle raw display
$43$ \( T^{8} + 6 T^{7} + \cdots + 8836 \) Copy content Toggle raw display
$47$ \( (T^{4} + 8 T^{3} + \cdots - 164)^{2} \) Copy content Toggle raw display
$53$ \( T^{8} + 24 T^{7} + \cdots + 19600 \) Copy content Toggle raw display
$59$ \( T^{8} - 22 T^{7} + \cdots + 119716 \) Copy content Toggle raw display
$61$ \( (T^{4} - 10 T^{3} + \cdots - 3628)^{2} \) Copy content Toggle raw display
$67$ \( T^{8} + 100 T^{6} + \cdots + 21904 \) Copy content Toggle raw display
$71$ \( T^{8} - 10 T^{7} + \cdots + 1223236 \) Copy content Toggle raw display
$73$ \( T^{8} + 116 T^{6} + \cdots + 547600 \) Copy content Toggle raw display
$79$ \( T^{8} + 292 T^{6} + \cdots + 13719616 \) Copy content Toggle raw display
$83$ \( (T^{4} + 24 T^{3} + \cdots - 7372)^{2} \) Copy content Toggle raw display
$89$ \( T^{8} + 28 T^{7} + \cdots + 1795600 \) Copy content Toggle raw display
$97$ \( T^{8} + 292 T^{6} + \cdots + 13719616 \) Copy content Toggle raw display
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