Properties

Label 2.53.a_bm
Base field $\F_{53}$
Dimension $2$
$p$-rank $2$
Ordinary yes
Supersingular no
Simple yes
Geometrically simple no
Primitive yes
Principally polarizable yes
Contains a Jacobian yes

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Invariants

Base field:  $\F_{53}$
Dimension:  $2$
L-polynomial:  $1 + 38 x^{2} + 2809 x^{4}$
Frobenius angles:  $\pm0.308354237277$, $\pm0.691645762723$
Angle rank:  $1$ (numerical)
Number field:  \(\Q(i, \sqrt{17})\)
Galois group:  $C_2^2$
Jacobians:  $454$
Cyclic group of points:    no
Non-cyclic primes:   $2$

This isogeny class is simple but not geometrically simple, primitive, ordinary, and not supersingular. It is principally polarizable and contains a Jacobian.

Newton polygon

This isogeny class is ordinary.

$p$-rank:  $2$
Slopes:  $[0, 0, 1, 1]$

Point counts

Point counts of the abelian variety

$r$ $1$ $2$ $3$ $4$ $5$
$A(\F_{q^r})$ $2848$ $8111104$ $22164095776$ $62325593358336$ $174887471173262368$

Point counts of the curve

$r$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$C(\F_{q^r})$ $54$ $2886$ $148878$ $7898830$ $418195494$ $22163830422$ $1174711139838$ $62259687128734$ $3299763591802134$ $174887471981011686$

Jacobians and polarizations

This isogeny class is principally polarizable and contains the Jacobians of 454 curves (of which all are hyperelliptic):

  • $y^2=3 x^5+44 x^4+19 x^3+10 x^2+15 x+16$
  • $y^2=6 x^5+35 x^4+38 x^3+20 x^2+30 x+32$
  • $y^2=6 x^6+27 x^5+x^4+42 x^3+24 x^2+32 x+9$
  • $y^2=12 x^6+x^5+2 x^4+31 x^3+48 x^2+11 x+18$
  • $y^2=36 x^6+19 x^5+17 x^4+26 x^3+23 x^2+13 x+48$
  • $y^2=13 x^6+6 x^5+46 x^4+25 x^3+34 x^2+24 x+13$
  • $y^2=26 x^6+12 x^5+39 x^4+50 x^3+15 x^2+48 x+26$
  • $y^2=40 x^6+15 x^5+43 x^4+28 x^3+17 x^2+11 x+34$
  • $y^2=27 x^6+30 x^5+33 x^4+3 x^3+34 x^2+22 x+15$
  • $y^2=31 x^6+14 x^5+45 x^4+8 x^3+46 x^2+50 x+45$
  • $y^2=9 x^6+28 x^5+37 x^4+16 x^3+39 x^2+47 x+37$
  • $y^2=45 x^6+13 x^5+19 x^4+32 x^3+25 x^2+34 x+4$
  • $y^2=37 x^6+26 x^5+38 x^4+11 x^3+50 x^2+15 x+8$
  • $y^2=38 x^6+46 x^5+2 x^4+3 x^3+35 x^2+14 x+47$
  • $y^2=23 x^6+39 x^5+4 x^4+6 x^3+17 x^2+28 x+41$
  • $y^2=49 x^6+5 x^5+17 x^4+20 x^3+10 x^2+46 x+48$
  • $y^2=45 x^6+10 x^5+34 x^4+40 x^3+20 x^2+39 x+43$
  • $y^2=22 x^6+8 x^5+15 x^4+10 x^3+49 x^2+42 x+33$
  • $y^2=44 x^6+16 x^5+30 x^4+20 x^3+45 x^2+31 x+13$
  • $y^2=27 x^6+49 x^5+9 x^4+38 x^3+43 x^2+42 x+8$
  • and 434 more

Decomposition and endomorphism algebra

All geometric endomorphisms are defined over $\F_{53^{2}}$.

Endomorphism algebra over $\F_{53}$
The endomorphism algebra of this simple isogeny class is \(\Q(i, \sqrt{17})\).
Endomorphism algebra over $\overline{\F}_{53}$
The base change of $A$ to $\F_{53^{2}}$ is 1.2809.bm 2 and its endomorphism algebra is $\mathrm{M}_{2}($\(\Q(\sqrt{-17}) \)$)$

Base change

This is a primitive isogeny class.

Twists

Below are some of the twists of this isogeny class.

TwistExtension degreeCommon base change
2.53.ay_jq$4$(not in LMFDB)
2.53.a_abm$4$(not in LMFDB)
2.53.y_jq$4$(not in LMFDB)

Below is a list of all twists of this isogeny class.

TwistExtension degreeCommon base change
2.53.ay_jq$4$(not in LMFDB)
2.53.a_abm$4$(not in LMFDB)
2.53.y_jq$4$(not in LMFDB)
2.53.am_dn$12$(not in LMFDB)
2.53.m_dn$12$(not in LMFDB)