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Properties

Label 15.3.f.a
Level $15$
Weight $3$
Character orbit 15.f
Analytic conductor $0.409$
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] = [15,3,Mod(7,15)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(15, base_ring=CyclotomicField(4))
 
chi = DirichletCharacter(H, H._module([0, 1]))
 
N = Newforms(chi, 3, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("15.7");
 
S:= CuspForms(chi, 3);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 15 = 3 \cdot 5 \)
Weight: \( k \) \(=\) \( 3 \)
Character orbit: \([\chi]\) \(=\) 15.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: \(0.408720396540\)
Analytic rank: \(0\)
Dimension: \(4\)
Relative dimension: \(2\) over \(\Q(i)\)
Coefficient field: \(\Q(i, \sqrt{6})\)
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{4} + 9 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, a_2, a_3]\)
Coefficient ring index: \( 1 \)
Twist minimal: yes
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 \(1,\beta_1,\beta_2,\beta_3\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + ( - \beta_{2} + \beta_1 - 1) q^{2} + \beta_{3} q^{3} + ( - 2 \beta_{3} + \beta_{2} - 2 \beta_1) q^{4} + (\beta_{3} + 3 \beta_{2} - 2 \beta_1 - 1) q^{5} + ( - \beta_{3} + \beta_1 - 3) q^{6} + (\beta_{2} + 2 \beta_1 + 1) q^{7} + (\beta_{3} - 3 \beta_{2} + 3) q^{8} - 3 \beta_{2} q^{9}+O(q^{10}) \) Copy content Toggle raw display \( q + ( - \beta_{2} + \beta_1 - 1) q^{2} + \beta_{3} q^{3} + ( - 2 \beta_{3} + \beta_{2} - 2 \beta_1) q^{4} + (\beta_{3} + 3 \beta_{2} - 2 \beta_1 - 1) q^{5} + ( - \beta_{3} + \beta_1 - 3) q^{6} + (\beta_{2} + 2 \beta_1 + 1) q^{7} + (\beta_{3} - 3 \beta_{2} + 3) q^{8} - 3 \beta_{2} q^{9} + (4 \beta_{3} - 8 \beta_{2} + 2 \beta_1 + 1) q^{10} + ( - 3 \beta_{3} + 3 \beta_1 + 4) q^{11} + (6 \beta_{2} - \beta_1 + 6) q^{12} + ( - 2 \beta_{3} + 8 \beta_{2} - 8) q^{13} + ( - \beta_{3} + 4 \beta_{2} - \beta_1) q^{14} + ( - \beta_{3} - 3 \beta_{2} - 3 \beta_1 + 6) q^{15} + (4 \beta_{3} - 4 \beta_1 - 5) q^{16} + ( - 10 \beta_{2} - 6 \beta_1 - 10) q^{17} + ( - 3 \beta_{3} + 3 \beta_{2} - 3) q^{18} + (6 \beta_{3} - 6 \beta_{2} + 6 \beta_1) q^{19} + ( - 6 \beta_{3} + 17 \beta_{2} + \cdots - 9) q^{20}+ \cdots + ( - 9 \beta_{3} - 12 \beta_{2} - 9 \beta_1) q^{99}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 4 q - 4 q^{2} - 4 q^{5} - 12 q^{6} + 4 q^{7} + 12 q^{8}+O(q^{10}) \) Copy content Toggle raw display \( 4 q - 4 q^{2} - 4 q^{5} - 12 q^{6} + 4 q^{7} + 12 q^{8} + 4 q^{10} + 16 q^{11} + 24 q^{12} - 32 q^{13} + 24 q^{15} - 20 q^{16} - 40 q^{17} - 12 q^{18} - 36 q^{20} - 24 q^{21} + 20 q^{22} + 56 q^{23} + 16 q^{25} + 88 q^{26} + 44 q^{28} - 24 q^{30} - 16 q^{31} - 76 q^{32} - 36 q^{33} - 40 q^{35} + 12 q^{36} + 64 q^{37} - 96 q^{38} + 48 q^{40} - 56 q^{41} + 12 q^{42} - 8 q^{43} + 36 q^{45} - 136 q^{46} + 128 q^{47} + 48 q^{48} + 164 q^{50} + 72 q^{51} - 80 q^{52} + 56 q^{53} - 124 q^{55} - 72 q^{57} - 12 q^{58} - 84 q^{60} + 200 q^{61} + 88 q^{62} + 12 q^{63} - 112 q^{65} + 24 q^{66} - 200 q^{67} - 104 q^{68} - 60 q^{70} - 272 q^{71} - 36 q^{72} + 76 q^{73} + 24 q^{75} + 312 q^{76} + 88 q^{77} + 120 q^{78} + 164 q^{80} - 36 q^{81} + 128 q^{82} - 16 q^{83} + 232 q^{85} - 224 q^{86} - 84 q^{87} + 12 q^{88} - 96 q^{90} - 16 q^{91} + 104 q^{92} - 72 q^{93} + 144 q^{95} - 84 q^{96} - 20 q^{97} - 188 q^{98}+O(q^{100}) \) Copy content Toggle raw display

Display 100 coefficients 10 coefficients

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{4} + 9 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( \nu \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( ( \nu^{2} ) / 3 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( \nu^{3} ) / 3 \) Copy content Toggle raw display

Display \(\nu^j\) in terms of \(\beta_i\)

\(\nu\)\(=\) \( \beta_1 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( 3\beta_{2} \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( 3\beta_{3} \) Copy content Toggle raw display

Display \(\beta_i\) in terms of \(\nu^j\)

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/15\mathbb{Z}\right)^\times\).

\(n\) \(7\) \(11\)
\(\chi(n)\) \(\beta_{2}\) \(1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
7.1
−1.22474 − 1.22474i
1.22474 + 1.22474i
−1.22474 + 1.22474i
1.22474 − 1.22474i
−2.22474 − 2.22474i 1.22474 − 1.22474i 5.89898i 2.67423 + 4.22474i −5.44949 −1.44949 − 1.44949i 4.22474 − 4.22474i − 3.00000i 3.44949 − 15.3485i
7.2 0.224745 + 0.224745i −1.22474 + 1.22474i − 3.89898i −4.67423 + 1.77526i −0.550510 3.44949 + 3.44949i 1.77526 − 1.77526i − 3.00000i −1.44949 − 0.651531i
13.1 −2.22474 + 2.22474i 1.22474 + 1.22474i − 5.89898i 2.67423 − 4.22474i −5.44949 −1.44949 + 1.44949i 4.22474 + 4.22474i 3.00000i 3.44949 + 15.3485i
13.2 0.224745 − 0.224745i −1.22474 − 1.22474i 3.89898i −4.67423 − 1.77526i −0.550510 3.44949 − 3.44949i 1.77526 + 1.77526i 3.00000i −1.44949 + 0.651531i
\(n\): e.g. 2-40 or 990-1000
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
5.c odd 4 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 15.3.f.a ✓ 4
3.b odd 2 1 45.3.g.b 4
4.b odd 2 1 240.3.bg.a 4
5.b even 2 1 75.3.f.c 4
5.c odd 4 1 inner 15.3.f.a ✓ 4
5.c odd 4 1 75.3.f.c 4
8.b even 2 1 960.3.bg.i 4
8.d odd 2 1 960.3.bg.h 4
9.c even 3 2 405.3.l.h 8
9.d odd 6 2 405.3.l.f 8
12.b even 2 1 720.3.bh.k 4
15.d odd 2 1 225.3.g.a 4
15.e even 4 1 45.3.g.b 4
15.e even 4 1 225.3.g.a 4
20.d odd 2 1 1200.3.bg.k 4
20.e even 4 1 240.3.bg.a 4
20.e even 4 1 1200.3.bg.k 4
40.i odd 4 1 960.3.bg.i 4
40.k even 4 1 960.3.bg.h 4
45.k odd 12 2 405.3.l.h 8
45.l even 12 2 405.3.l.f 8
60.l odd 4 1 720.3.bh.k 4
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
15.3.f.a ✓ 4 1.a even 1 1 trivial
15.3.f.a ✓ 4 5.c odd 4 1 inner
45.3.g.b 4 3.b odd 2 1
45.3.g.b 4 15.e even 4 1
75.3.f.c 4 5.b even 2 1
75.3.f.c 4 5.c odd 4 1
225.3.g.a 4 15.d odd 2 1
225.3.g.a 4 15.e even 4 1
240.3.bg.a 4 4.b odd 2 1
240.3.bg.a 4 20.e even 4 1
405.3.l.f 8 9.d odd 6 2
405.3.l.f 8 45.l even 12 2
405.3.l.h 8 9.c even 3 2
405.3.l.h 8 45.k odd 12 2
720.3.bh.k 4 12.b even 2 1
720.3.bh.k 4 60.l odd 4 1
960.3.bg.h 4 8.d odd 2 1
960.3.bg.h 4 40.k even 4 1
960.3.bg.i 4 8.b even 2 1
960.3.bg.i 4 40.i odd 4 1
1200.3.bg.k 4 20.d odd 2 1
1200.3.bg.k 4 20.e even 4 1

Hecke kernels

This newform subspace is the entire newspace \(S_{3}^{\mathrm{new}}(15, [\chi])\).

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{4} + 4 T^{3} + \cdots + 1 \) Copy content Toggle raw display
$3$ \( T^{4} + 9 \) Copy content Toggle raw display
$5$ \( T^{4} + 4 T^{3} + \cdots + 625 \) Copy content Toggle raw display
$7$ \( T^{4} - 4 T^{3} + \cdots + 100 \) Copy content Toggle raw display
$11$ \( (T^{2} - 8 T - 38)^{2} \) Copy content Toggle raw display
$13$ \( T^{4} + 32 T^{3} + \cdots + 13456 \) Copy content Toggle raw display
$17$ \( T^{4} + 40 T^{3} + \cdots + 8464 \) Copy content Toggle raw display
$19$ \( T^{4} + 504 T^{2} + 32400 \) Copy content Toggle raw display
$23$ \( T^{4} - 56 T^{3} + \cdots + 144400 \) Copy content Toggle raw display
$29$ \( T^{4} + 1236T^{2} + 900 \) Copy content Toggle raw display
$31$ \( (T^{2} + 8 T - 200)^{2} \) Copy content Toggle raw display
$37$ \( T^{4} - 64 T^{3} + \cdots + 211600 \) Copy content Toggle raw display
$41$ \( (T^{2} + 28 T - 20)^{2} \) Copy content Toggle raw display
$43$ \( T^{4} + 8 T^{3} + \cdots + 1420864 \) Copy content Toggle raw display
$47$ \( T^{4} - 128 T^{3} + \cdots + 3055504 \) Copy content Toggle raw display
$53$ \( T^{4} - 56 T^{3} + \cdots + 1600 \) Copy content Toggle raw display
$59$ \( T^{4} + 14124 T^{2} + 19980900 \) Copy content Toggle raw display
$61$ \( (T^{2} - 100 T + 556)^{2} \) Copy content Toggle raw display
$67$ \( T^{4} + 200 T^{3} + \cdots + 24522304 \) Copy content Toggle raw display
$71$ \( (T + 68)^{4} \) Copy content Toggle raw display
$73$ \( T^{4} - 76 T^{3} + \cdots + 38316100 \) Copy content Toggle raw display
$79$ \( (T^{2} + 600)^{2} \) Copy content Toggle raw display
$83$ \( T^{4} + 16 T^{3} + \cdots + 309136 \) Copy content Toggle raw display
$89$ \( T^{4} + 15624 T^{2} + 59907600 \) Copy content Toggle raw display
$97$ \( T^{4} + 20 T^{3} + \cdots + 515524 \) Copy content Toggle raw display
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