Properties

Label 91.2.k.a
Level $91$
Weight $2$
Character orbit 91.k
Analytic conductor $0.727$
Analytic rank $0$
Dimension $2$
CM no
Inner twists $2$

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Newspace parameters

Level: \( N \) \(=\) \( 91 = 7 \cdot 13 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 91.k (of order \(6\), degree \(2\), minimal)

Newform invariants

Self dual: no
Analytic conductor: \(0.726638658394\)
Analytic rank: \(0\)
Dimension: \(2\)
Coefficient field: \(\Q(\sqrt{-3}) \)
Defining polynomial: \(x^{2} - x + 1\)
Coefficient ring: \(\Z[a_1, a_2, a_3]\)
Coefficient ring index: \( 1 \)
Twist minimal: yes
Sato-Tate group: $\mathrm{SU}(2)[C_{6}]$

$q$-expansion

Coefficients of the \(q\)-expansion are expressed in terms of a primitive root of unity \(\zeta_{6}\). We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + ( 1 - 2 \zeta_{6} ) q^{2} + \zeta_{6} q^{3} - q^{4} + ( 2 - \zeta_{6} ) q^{5} + ( 2 - \zeta_{6} ) q^{6} + ( -3 + 2 \zeta_{6} ) q^{7} + ( 1 - 2 \zeta_{6} ) q^{8} + ( 2 - 2 \zeta_{6} ) q^{9} +O(q^{10})\) \( q + ( 1 - 2 \zeta_{6} ) q^{2} + \zeta_{6} q^{3} - q^{4} + ( 2 - \zeta_{6} ) q^{5} + ( 2 - \zeta_{6} ) q^{6} + ( -3 + 2 \zeta_{6} ) q^{7} + ( 1 - 2 \zeta_{6} ) q^{8} + ( 2 - 2 \zeta_{6} ) q^{9} -3 \zeta_{6} q^{10} + ( -6 + 3 \zeta_{6} ) q^{11} -\zeta_{6} q^{12} + ( -3 + 4 \zeta_{6} ) q^{13} + ( 1 + 4 \zeta_{6} ) q^{14} + ( 1 + \zeta_{6} ) q^{15} -5 q^{16} + 6 q^{17} + ( -2 - 2 \zeta_{6} ) q^{18} + ( -1 - \zeta_{6} ) q^{19} + ( -2 + \zeta_{6} ) q^{20} + ( -2 - \zeta_{6} ) q^{21} + 9 \zeta_{6} q^{22} + ( 2 - \zeta_{6} ) q^{24} + ( -2 + 2 \zeta_{6} ) q^{25} + ( 5 + 2 \zeta_{6} ) q^{26} + 5 q^{27} + ( 3 - 2 \zeta_{6} ) q^{28} + ( -3 + 3 \zeta_{6} ) q^{29} + ( 3 - 3 \zeta_{6} ) q^{30} + ( -1 - \zeta_{6} ) q^{31} + ( -3 + 6 \zeta_{6} ) q^{32} + ( -3 - 3 \zeta_{6} ) q^{33} + ( 6 - 12 \zeta_{6} ) q^{34} + ( -4 + 5 \zeta_{6} ) q^{35} + ( -2 + 2 \zeta_{6} ) q^{36} + ( -3 + 3 \zeta_{6} ) q^{38} + ( -4 + \zeta_{6} ) q^{39} -3 \zeta_{6} q^{40} + ( -3 - 3 \zeta_{6} ) q^{41} + ( -4 + 5 \zeta_{6} ) q^{42} -11 \zeta_{6} q^{43} + ( 6 - 3 \zeta_{6} ) q^{44} + ( 2 - 4 \zeta_{6} ) q^{45} + ( 10 - 5 \zeta_{6} ) q^{47} -5 \zeta_{6} q^{48} + ( 5 - 8 \zeta_{6} ) q^{49} + ( 2 + 2 \zeta_{6} ) q^{50} + 6 \zeta_{6} q^{51} + ( 3 - 4 \zeta_{6} ) q^{52} + ( 9 - 9 \zeta_{6} ) q^{53} + ( 5 - 10 \zeta_{6} ) q^{54} + ( -9 + 9 \zeta_{6} ) q^{55} + ( 1 + 4 \zeta_{6} ) q^{56} + ( 1 - 2 \zeta_{6} ) q^{57} + ( 3 + 3 \zeta_{6} ) q^{58} + ( -2 + 4 \zeta_{6} ) q^{59} + ( -1 - \zeta_{6} ) q^{60} + ( -7 + 7 \zeta_{6} ) q^{61} + ( -3 + 3 \zeta_{6} ) q^{62} + ( -2 + 6 \zeta_{6} ) q^{63} - q^{64} + ( -2 + 7 \zeta_{6} ) q^{65} + ( -9 + 9 \zeta_{6} ) q^{66} + ( 10 - 5 \zeta_{6} ) q^{67} -6 q^{68} + ( 6 + 3 \zeta_{6} ) q^{70} + ( 2 - \zeta_{6} ) q^{71} + ( -2 - 2 \zeta_{6} ) q^{72} + ( 5 + 5 \zeta_{6} ) q^{73} -2 q^{75} + ( 1 + \zeta_{6} ) q^{76} + ( 12 - 15 \zeta_{6} ) q^{77} + ( -2 + 7 \zeta_{6} ) q^{78} + 5 \zeta_{6} q^{79} + ( -10 + 5 \zeta_{6} ) q^{80} -\zeta_{6} q^{81} + ( -9 + 9 \zeta_{6} ) q^{82} + ( 2 - 4 \zeta_{6} ) q^{83} + ( 2 + \zeta_{6} ) q^{84} + ( 12 - 6 \zeta_{6} ) q^{85} + ( -22 + 11 \zeta_{6} ) q^{86} -3 q^{87} + 9 \zeta_{6} q^{88} + ( 4 - 8 \zeta_{6} ) q^{89} -6 q^{90} + ( 1 - 10 \zeta_{6} ) q^{91} + ( 1 - 2 \zeta_{6} ) q^{93} -15 \zeta_{6} q^{94} -3 q^{95} + ( -6 + 3 \zeta_{6} ) q^{96} + ( -6 + 3 \zeta_{6} ) q^{97} + ( -11 - 2 \zeta_{6} ) q^{98} + ( -6 + 12 \zeta_{6} ) q^{99} +O(q^{100})\)
\(\operatorname{Tr}(f)(q)\) \(=\) \( 2q + q^{3} - 2q^{4} + 3q^{5} + 3q^{6} - 4q^{7} + 2q^{9} + O(q^{10}) \) \( 2q + q^{3} - 2q^{4} + 3q^{5} + 3q^{6} - 4q^{7} + 2q^{9} - 3q^{10} - 9q^{11} - q^{12} - 2q^{13} + 6q^{14} + 3q^{15} - 10q^{16} + 12q^{17} - 6q^{18} - 3q^{19} - 3q^{20} - 5q^{21} + 9q^{22} + 3q^{24} - 2q^{25} + 12q^{26} + 10q^{27} + 4q^{28} - 3q^{29} + 3q^{30} - 3q^{31} - 9q^{33} - 3q^{35} - 2q^{36} - 3q^{38} - 7q^{39} - 3q^{40} - 9q^{41} - 3q^{42} - 11q^{43} + 9q^{44} + 15q^{47} - 5q^{48} + 2q^{49} + 6q^{50} + 6q^{51} + 2q^{52} + 9q^{53} - 9q^{55} + 6q^{56} + 9q^{58} - 3q^{60} - 7q^{61} - 3q^{62} + 2q^{63} - 2q^{64} + 3q^{65} - 9q^{66} + 15q^{67} - 12q^{68} + 15q^{70} + 3q^{71} - 6q^{72} + 15q^{73} - 4q^{75} + 3q^{76} + 9q^{77} + 3q^{78} + 5q^{79} - 15q^{80} - q^{81} - 9q^{82} + 5q^{84} + 18q^{85} - 33q^{86} - 6q^{87} + 9q^{88} - 12q^{90} - 8q^{91} - 15q^{94} - 6q^{95} - 9q^{96} - 9q^{97} - 24q^{98} + O(q^{100}) \)

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/91\mathbb{Z}\right)^\times\).

\(n\) \(15\) \(66\)
\(\chi(n)\) \(\zeta_{6}\) \(-\zeta_{6}\)

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 \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
4.1
0.500000 + 0.866025i
0.500000 0.866025i
1.73205i 0.500000 + 0.866025i −1.00000 1.50000 0.866025i 1.50000 0.866025i −2.00000 + 1.73205i 1.73205i 1.00000 1.73205i −1.50000 2.59808i
23.1 1.73205i 0.500000 0.866025i −1.00000 1.50000 + 0.866025i 1.50000 + 0.866025i −2.00000 1.73205i 1.73205i 1.00000 + 1.73205i −1.50000 + 2.59808i
\(n\): e.g. 2-40 or 990-1000
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
91.k even 6 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 91.2.k.a 2
3.b odd 2 1 819.2.bm.a 2
7.b odd 2 1 637.2.k.b 2
7.c even 3 1 91.2.u.a yes 2
7.c even 3 1 637.2.q.c 2
7.d odd 6 1 637.2.q.b 2
7.d odd 6 1 637.2.u.a 2
13.e even 6 1 91.2.u.a yes 2
13.f odd 12 2 1183.2.e.e 4
21.h odd 6 1 819.2.do.c 2
39.h odd 6 1 819.2.do.c 2
91.k even 6 1 inner 91.2.k.a 2
91.l odd 6 1 637.2.k.b 2
91.p odd 6 1 637.2.q.b 2
91.t odd 6 1 637.2.u.a 2
91.u even 6 1 637.2.q.c 2
91.x odd 12 2 8281.2.a.s 2
91.ba even 12 2 8281.2.a.w 2
91.bd odd 12 2 1183.2.e.e 4
273.bp odd 6 1 819.2.bm.a 2
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
91.2.k.a 2 1.a even 1 1 trivial
91.2.k.a 2 91.k even 6 1 inner
91.2.u.a yes 2 7.c even 3 1
91.2.u.a yes 2 13.e even 6 1
637.2.k.b 2 7.b odd 2 1
637.2.k.b 2 91.l odd 6 1
637.2.q.b 2 7.d odd 6 1
637.2.q.b 2 91.p odd 6 1
637.2.q.c 2 7.c even 3 1
637.2.q.c 2 91.u even 6 1
637.2.u.a 2 7.d odd 6 1
637.2.u.a 2 91.t odd 6 1
819.2.bm.a 2 3.b odd 2 1
819.2.bm.a 2 273.bp odd 6 1
819.2.do.c 2 21.h odd 6 1
819.2.do.c 2 39.h odd 6 1
1183.2.e.e 4 13.f odd 12 2
1183.2.e.e 4 91.bd odd 12 2
8281.2.a.s 2 91.x odd 12 2
8281.2.a.w 2 91.ba even 12 2

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{2}^{2} + 3 \) acting on \(S_{2}^{\mathrm{new}}(91, [\chi])\).

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( 3 + T^{2} \)
$3$ \( 1 - T + T^{2} \)
$5$ \( 3 - 3 T + T^{2} \)
$7$ \( 7 + 4 T + T^{2} \)
$11$ \( 27 + 9 T + T^{2} \)
$13$ \( 13 + 2 T + T^{2} \)
$17$ \( ( -6 + T )^{2} \)
$19$ \( 3 + 3 T + T^{2} \)
$23$ \( T^{2} \)
$29$ \( 9 + 3 T + T^{2} \)
$31$ \( 3 + 3 T + T^{2} \)
$37$ \( T^{2} \)
$41$ \( 27 + 9 T + T^{2} \)
$43$ \( 121 + 11 T + T^{2} \)
$47$ \( 75 - 15 T + T^{2} \)
$53$ \( 81 - 9 T + T^{2} \)
$59$ \( 12 + T^{2} \)
$61$ \( 49 + 7 T + T^{2} \)
$67$ \( 75 - 15 T + T^{2} \)
$71$ \( 3 - 3 T + T^{2} \)
$73$ \( 75 - 15 T + T^{2} \)
$79$ \( 25 - 5 T + T^{2} \)
$83$ \( 12 + T^{2} \)
$89$ \( 48 + T^{2} \)
$97$ \( 27 + 9 T + T^{2} \)
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