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Newspace parameters

Copy content comment:Compute space of new eigenforms
 
Copy content gp:[N,k,chi] = [2448,2,Mod(1871,2448)] mf = mfinit([N,k,chi],0) lf = mfeigenbasis(mf)
 
Copy content magma:// Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code chi := DirichletCharacter("2448.1871"); S:= CuspForms(chi, 2); N := Newforms(S);
 
Copy content sage:from sage.modular.dirichlet import DirichletCharacter H = DirichletGroup(2448, base_ring=CyclotomicField(2)) chi = DirichletCharacter(H, H._module([1, 0, 1, 0])) N = Newforms(chi, 2, names="a")
 
Level: \( N \) \(=\) \( 2448 = 2^{4} \cdot 3^{2} \cdot 17 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 2448.e (of order \(2\), degree \(1\), minimal)

Newform invariants

Copy content comment:select newform
 
Copy content sage:traces = [8] f = next(g for g in N if [g.coefficient(i+1).trace() for i in range(1)] == traces)
 
Copy content gp:f = lf[1] \\ Warning: the index may be different
 
Self dual: no
Analytic conductor: \(19.5473784148\)
Analytic rank: \(0\)
Dimension: \(8\)
Coefficient field: 8.0.18939904.2
Copy content comment:defining polynomial
 
Copy content gp:f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} - 4x^{7} + 14x^{6} - 28x^{5} + 43x^{4} - 44x^{3} + 30x^{2} - 12x + 2 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{11}]\)
Coefficient ring index: \( 2^{6} \)
Twist minimal: yes
Sato-Tate group: $\mathrm{SU}(2)[C_{2}]$

$q$-expansion

Copy content comment:q-expansion
 
Copy content sage:f.q_expansion() # note that sage often uses an isomorphic number field
 
Copy content 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.

\(f(q)\) \(=\) \( q + \beta_{4} q^{5} + (\beta_{7} + \beta_{6}) q^{7} - \beta_1 q^{11} + (2 \beta_{2} - 1) q^{13} - \beta_{4} q^{17} + ( - \beta_{7} + 2 \beta_{6}) q^{19} + (2 \beta_{3} - \beta_1) q^{23} + 4 q^{25} + (2 \beta_{5} + 4 \beta_{4}) q^{29}+ \cdots + (2 \beta_{2} + 4) q^{97}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q - 8 q^{13} + 32 q^{25} - 16 q^{37} - 24 q^{49} - 16 q^{61} + 8 q^{85} + 32 q^{97}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{8} - 4x^{7} + 14x^{6} - 28x^{5} + 43x^{4} - 44x^{3} + 30x^{2} - 12x + 2 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( -\nu^{4} + 2\nu^{3} - 7\nu^{2} + 6\nu - 5 \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( \nu^{6} - 3\nu^{5} + 10\nu^{4} - 15\nu^{3} + 19\nu^{2} - 12\nu + 4 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( -\nu^{6} + 3\nu^{5} - 11\nu^{4} + 17\nu^{3} - 24\nu^{2} + 16\nu - 5 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( -8\nu^{7} + 28\nu^{6} - 98\nu^{5} + 175\nu^{4} - 256\nu^{3} + 223\nu^{2} - 126\nu + 31 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( 10\nu^{7} - 35\nu^{6} + 123\nu^{5} - 220\nu^{4} + 325\nu^{3} - 285\nu^{2} + 166\nu - 42 \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( 10\nu^{7} - 35\nu^{6} + 123\nu^{5} - 220\nu^{4} + 325\nu^{3} - 285\nu^{2} + 168\nu - 43 \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( -28\nu^{7} + 98\nu^{6} - 342\nu^{5} + 610\nu^{4} - 890\nu^{3} + 774\nu^{2} - 440\nu + 109 \) Copy content Toggle raw display
\(\nu\)\(=\) \( ( \beta_{6} - \beta_{5} + 1 ) / 2 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( ( \beta_{6} - \beta_{5} + \beta_{3} + \beta_{2} - \beta _1 - 3 ) / 2 \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( ( -\beta_{7} - 5\beta_{6} + 7\beta_{5} + 6\beta_{4} + 3\beta_{3} + 3\beta_{2} - 3\beta _1 - 10 ) / 4 \) Copy content Toggle raw display
\(\nu^{4}\)\(=\) \( ( -\beta_{7} - 6\beta_{6} + 8\beta_{5} + 6\beta_{4} - 4\beta_{3} - 4\beta_{2} + 2\beta _1 + 7 ) / 2 \) Copy content Toggle raw display
\(\nu^{5}\)\(=\) \( ( 5\beta_{7} + 11\beta_{6} - 13\beta_{5} - 20\beta_{4} - 25\beta_{3} - 25\beta_{2} + 15\beta _1 + 52 ) / 4 \) Copy content Toggle raw display
\(\nu^{6}\)\(=\) \( ( 10\beta_{7} + 32\beta_{6} - 40\beta_{5} - 45\beta_{4} + 6\beta_{3} + 8\beta_{2} - \beta _1 - 6 ) / 2 \) Copy content Toggle raw display
\(\nu^{7}\)\(=\) \( ( -3\beta_{7} + 11\beta_{6} - 19\beta_{5} + 133\beta_{3} + 147\beta_{2} - 63\beta _1 - 236 ) / 4 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/2448\mathbb{Z}\right)^\times\).

\(n\) \(613\) \(1361\) \(1873\) \(2143\)
\(\chi(n)\) \(1\) \(-1\) \(1\) \(-1\)

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.

Copy content comment:embeddings in the coefficient field
 
Copy content gp:mfembed(f)
 
Label   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
1871.1
0.500000 − 0.691860i
0.500000 + 0.0297061i
0.500000 − 1.44392i
0.500000 + 2.10607i
0.500000 − 2.10607i
0.500000 + 1.44392i
0.500000 − 0.0297061i
0.500000 + 0.691860i
0 0 0 − 1.00000i 0 − 3.95687i 0 0 0
1871.2 0 0 0 − 1.00000i 0 − 2.08402i 0 0 0
1871.3 0 0 0 − 1.00000i 0 2.08402i 0 0 0
1871.4 0 0 0 − 1.00000i 0 3.95687i 0 0 0
1871.5 0 0 0 1.00000i 0 − 3.95687i 0 0 0
1871.6 0 0 0 1.00000i 0 − 2.08402i 0 0 0
1871.7 0 0 0 1.00000i 0 2.08402i 0 0 0
1871.8 0 0 0 1.00000i 0 3.95687i 0 0 0
\(n\): e.g. 2-40 or 80-90
Embeddings: e.g. 1-3 or 1871.8
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
3.b odd 2 1 inner
4.b odd 2 1 inner
12.b even 2 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 2448.2.e.a ✓ 8
3.b odd 2 1 inner 2448.2.e.a ✓ 8
4.b odd 2 1 inner 2448.2.e.a ✓ 8
12.b even 2 1 inner 2448.2.e.a ✓ 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
2448.2.e.a ✓ 8 1.a even 1 1 trivial
2448.2.e.a ✓ 8 3.b odd 2 1 inner
2448.2.e.a ✓ 8 4.b odd 2 1 inner
2448.2.e.a ✓ 8 12.b even 2 1 inner

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{5}^{2} + 1 \) acting on \(S_{2}^{\mathrm{new}}(2448, [\chi])\). Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{8} \) Copy content Toggle raw display
$3$ \( T^{8} \) Copy content Toggle raw display
$5$ \( (T^{2} + 1)^{4} \) Copy content Toggle raw display
$7$ \( (T^{4} + 20 T^{2} + 68)^{2} \) Copy content Toggle raw display
$11$ \( (T^{4} - 14 T^{2} + 17)^{2} \) Copy content Toggle raw display
$13$ \( (T^{2} + 2 T - 7)^{4} \) Copy content Toggle raw display
$17$ \( (T^{2} + 1)^{4} \) Copy content Toggle raw display
$19$ \( (T^{4} + 62 T^{2} + 833)^{2} \) Copy content Toggle raw display
$23$ \( (T^{4} - 46 T^{2} + 17)^{2} \) Copy content Toggle raw display
$29$ \( (T^{4} + 48 T^{2} + 64)^{2} \) Copy content Toggle raw display
$31$ \( (T^{4} + 92 T^{2} + 68)^{2} \) Copy content Toggle raw display
$37$ \( (T^{2} + 4 T - 46)^{4} \) Copy content Toggle raw display
$41$ \( (T^{4} + 162 T^{2} + 289)^{2} \) Copy content Toggle raw display
$43$ \( (T^{4} + 14 T^{2} + 17)^{2} \) Copy content Toggle raw display
$47$ \( (T^{4} - 92 T^{2} + 68)^{2} \) Copy content Toggle raw display
$53$ \( (T^{4} + 68 T^{2} + 4)^{2} \) Copy content Toggle raw display
$59$ \( (T^{4} - 248 T^{2} + 13328)^{2} \) Copy content Toggle raw display
$61$ \( (T^{2} + 4 T - 94)^{4} \) Copy content Toggle raw display
$67$ \( (T^{4} + 80 T^{2} + 1088)^{2} \) Copy content Toggle raw display
$71$ \( (T^{4} - 320 T^{2} + 17408)^{2} \) Copy content Toggle raw display
$73$ \( (T^{2} - 18)^{4} \) Copy content Toggle raw display
$79$ \( (T^{4} + 248 T^{2} + 13328)^{2} \) Copy content Toggle raw display
$83$ \( (T^{4} - 380 T^{2} + 35972)^{2} \) Copy content Toggle raw display
$89$ \( (T^{4} + 44 T^{2} + 196)^{2} \) Copy content Toggle raw display
$97$ \( (T^{2} - 8 T + 8)^{4} \) Copy content Toggle raw display
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