Further results on fibre products of Kummer covers and curves with many points over finite fields

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February 2016, 10(1): 151-162. doi: 10.3934/amc.2016.10.151

Further results on fibre products of Kummer covers and curves with many points over finite fields

Ferruh Özbudak ^1, , Burcu Gülmez Temür ^2, and Oǧuz Yayla ^3,

1.	Department of Mathematics and Institute of Applied Mathematics, Middle East Technical University, Dumlupnar Bulvar, 06800, Ankara, Turkey
2.	Department of Mathematics, Atlm University, Incek, Golbas, 06836, Ankara, Turkey
3.	Department of Mathematics, Hacettepe University, Beytepe, 06800, Ankara, Turkey

Received December 2014 Revised December 2015 Published March 2016

Abstract
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We study fibre products of an arbitrary number of Kummer covers of the projective line over $\mathbb{F}_q$ under suitable weak assumptions. If $q-1 = r^a$ for some prime $r$, then we completely determine the number of rational points over a rational point of the projective line. Using this result we obtain explicit examples of fibre products of three Kummer covers supplying new entries for the current table of curves with many points (http://www.manypoints.org, October 31 2015).

Keywords: fibre products, Kummer covers, rational points, Curves with many points over finite fields, algebraic function fields..

Mathematics Subject Classification: Primary: 11G20, 14G15; Secondary: 14H2.

Citation: Ferruh Özbudak, Burcu Gülmez Temür, Oǧuz Yayla. Further results on fibre products of Kummer covers and curves with many points over finite fields. Advances in Mathematics of Communications, 2016, 10 (1) : 151-162. doi: 10.3934/amc.2016.10.151

References:

[1]	A. Garcia and A. Garzon, On Kummer covers with many rational points over finite fields, J. Pure Appl. Algebra, 185 (2003), 177-192. doi: 10.1016/S0022-4049(03)00110-5.
[2]	G. van der Geer and M. van der Vlugt, Tables of curves with many points, Math. Comput., 69 (2000), 797-810. doi: 10.1090/S0025-5718-99-01143-6.
[3]	J. W. P. Hirschfeld, Projective Geometries over Finite Fields, 2nd edition, The Clarendon Press, New York, 1998.
[4]	J. W. P. Hirschfeld, G. Korchmáros and F. Torres, Algebraic Curves over a Finite Field, Princeton Univ. Press, Princeton, 2008.
[5]	B. Huppert and N. Blackburn, Finite Groups II Springer-Verlag, New York, 1981.
[6]	M. Q. Kawakita, Kummer curves and their fibre products with many rational points, Appl. Algebra Engrg. Comm. Comput., 14 (2003), 55-64.
[7]	H. Niederreiter and C. Xing, Rational Points on Curves over Finite Fields, Cambridge Univ. Press, Cambridge, 2001. doi: 10.1017/CBO9781107325951.
[8]	H. Niederreiter and C. Xing, Algebraic Geometry in Coding Theory and Cryptography, Princeton Univ. Press, Princeton, 2009.
[9]	F. Özbudak and H. Stichtenoth, Curves with many points and configurations of hyperplanes over finite fields, Finite Fields Appl., 5 (1999), 436-449. doi: 10.1006/ffta.1999.0262.
[10]	F. Özbudak and B. G. Temür, Finite number of fibre products of Kummer covers and curves with many points over finite fields, Des. Codes Crypt., 70 (2014), 385-404. doi: 10.1007/s10623-012-9706-2.
[11]	H. Stichtenoth, Algebraic Function Fields and Codes, Springer, Berlin, 1993.
[12]	M. A. Tsfasman, S. G. Vlădut and D. Nogin, Algebraic Geometric Codes: Basic Notions, Amer. Math. Soc., Providence, 2007. doi: 10.1090/surv/139.
[13]	, Manypoints-Table of Curves with Many Points, available online at http://www.manypoints.org

show all references

References:

[1]	A. Garcia and A. Garzon, On Kummer covers with many rational points over finite fields, J. Pure Appl. Algebra, 185 (2003), 177-192. doi: 10.1016/S0022-4049(03)00110-5.
[2]	G. van der Geer and M. van der Vlugt, Tables of curves with many points, Math. Comput., 69 (2000), 797-810. doi: 10.1090/S0025-5718-99-01143-6.
[3]	J. W. P. Hirschfeld, Projective Geometries over Finite Fields, 2nd edition, The Clarendon Press, New York, 1998.
[4]	J. W. P. Hirschfeld, G. Korchmáros and F. Torres, Algebraic Curves over a Finite Field, Princeton Univ. Press, Princeton, 2008.
[5]	B. Huppert and N. Blackburn, Finite Groups II Springer-Verlag, New York, 1981.
[6]	M. Q. Kawakita, Kummer curves and their fibre products with many rational points, Appl. Algebra Engrg. Comm. Comput., 14 (2003), 55-64.
[7]	H. Niederreiter and C. Xing, Rational Points on Curves over Finite Fields, Cambridge Univ. Press, Cambridge, 2001. doi: 10.1017/CBO9781107325951.
[8]	H. Niederreiter and C. Xing, Algebraic Geometry in Coding Theory and Cryptography, Princeton Univ. Press, Princeton, 2009.
[9]	F. Özbudak and H. Stichtenoth, Curves with many points and configurations of hyperplanes over finite fields, Finite Fields Appl., 5 (1999), 436-449. doi: 10.1006/ffta.1999.0262.
[10]	F. Özbudak and B. G. Temür, Finite number of fibre products of Kummer covers and curves with many points over finite fields, Des. Codes Crypt., 70 (2014), 385-404. doi: 10.1007/s10623-012-9706-2.
[11]	H. Stichtenoth, Algebraic Function Fields and Codes, Springer, Berlin, 1993.
[12]	M. A. Tsfasman, S. G. Vlădut and D. Nogin, Algebraic Geometric Codes: Basic Notions, Amer. Math. Soc., Providence, 2007. doi: 10.1090/surv/139.
[13]	, Manypoints-Table of Curves with Many Points, available online at http://www.manypoints.org

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