 
         
      Research: 
      Number Theory: Elliptic curves, Hyperelliptic curves,
        Modular curves, Modular Abelian Varieties, Arithmetic progression,
        Diophantine equations. 
      
      
       Papers:
        
      
      
      
      
           - Squares in arithmetic progression over certain non-primitive quartic number fields (joint with Nguyen Xuan Tho). 
              Submitted 
            
- Quadratic points on the Fermat quartic over number fields. Submitted
- Parametrization of isogeny-torsion graphs of
              elliptic curves defined over Q .
 
- Faltings ellipitc curves in twisted Q-isogeny classes,
              (joint with J.C. Lario). 
                          arxiv
          data
          Submitted .
          
 
         
         
         
                  
           - Models of CM elliptic curves with a prescribed l-adic Galois image, (joint with Álvaro Lozano-Robledo and Benjamin York). 
              Journal of
            Number Theory  277 (2025) 19-62. 
            doi
          data
          
- Torsion growth over cubic fields of rational
              elliptic curves with complex multiplication,
              Publicationes Mathematicae Debrecen 97/1-2, 63-76 (2020). pdf
          doi
          data
- Explicit characterization of the torsion
              growth of rational elliptic curves with complex multiplication
              over quadratic fields, Glasnik Matematički 56(76)(2021),
            47-61. pdf
          doi 
          data
- An algorithm for determining torsion growth
              of elliptic curves (joint with F. Najman). Experimental
            Mathematics 32
          (2023) 70-81 doi
          data
          
 
-  Serre's constant of elliptic curves over the
              rationals (joint with H.B. Daniels). Experimental
            Mathematics 31 (2022) 518-532 pdf
          doi
          data
 
- On the torsion of rational elliptic curves
              over sextic fields (joint with H.B. Daniels).
            Mathematics of Computation 89 (2020)
            411-439. pdf
          doi
              data
- Growth of torsion groups of elliptic curves
              upon base changes (joint with F. Najman). Mathematics of
            Computation 89 (2020) 1457-1485 pdf errata
             doi data
- Complete classification of the torsion
              structures of rational elliptic curves over quintic number fields.
          Journal of Algebra 478 (2017) 484–505. pdf
              doi data
- On the torsion of rational elliptic curves
              over quartic fields (joint with Á. Lozano-Robledo).
            Mathematics of Computation 87 (2018) 1457-1478. pdf
               doi
            data 
- On the minimal degree of definition of
                p-primary torsion subgroups of elliptic curves (joint
            with Á. Lozano-Robledo). Mathematical Research Letter 24 (2017)
            1067-1096. pdf
              doi
              data
 
- Elliptic Curves with abelian division fields
          (joint with Á. Lozano-Robledo). Mathematische Zeitschrift 283,
          835-859 (2016). pdf
          doi
          data
- Torsion
                of rational elliptic curves over cubic fields (joint
            with F. Najman and J.M. Tornero). Rocky Mountain Journal of
            Mathematics 46 (2016) 1899-1917. pdf
          doi
 
- Torsion
                of rational elliptic curves over quadratic fields II (joint
            with J.M. Tornero). Revista de la Real Academia de Ciencias Exactas,
            Físicas y Naturales. Serie A. Matemática, 110 (1) (2016), 121-143. pdf.
          doi
 
- Covering
                techniques and rational points on some genus 5 curves.
            Contemporary Mathematics AMS (2015) 649, 89-105 pdf
          doi
          
 
- On
                arithmetic progressions on Edwards curves. Acta
            Arithmetica 167 (2015), 117-132. pdf
          doi
 
- Torsion
                of rational elliptic curves over quadratic fields
          (joint with J.M. Tornero). Revista de la Real Academia de Ciencias
          Exactas, Físicas y Naturales. Serie A. Matemáticas. 108 (2) (2014),
          923-934. pdf
          doi
 
- On a
                conjecture of Rudin on squares in arithmetic progressions 
          (joint with X. Xarles). LMS Journal of Computation and Mathematics
          17 (1) (2014), 58-76. pdf
          doi
          data
 
- Markoff-Rosenberger
                triples in geometric progression. Acta Mathematica
            Hungarica 142 (1) (2014), 231-243. pdf
              doi
 
- Five
                squares in arithmetic progression over quadratic fields
          (joint with X. Xarles). Revista Matemática Iberoamericana 29, no. 4,
          1211-1238 (2013). pdf
          doi
          data
- Markoff-Rosenberger
                triples in arithmetic progression (joint with J.M.
            Tornero). Journal of Symbolic Computation 53, 53-63 (2013). pdf
          doi
          data
- On
                symmetric square values of quadratic polynomials
          (joint with X. Xarles). Acta Arithmetica 149, 145-159 (2011).
            pdf
            doi data.
- On
                fields of definition of torsion points of elliptic curves with
                complex multiplication (joint with L. Dieulefait and
            J. Jiménez Urroz). Proceedings of the American Mathematical Society
            139, no. 6, 1961-1969 (2011). pdf
              data doi
        
- Three
                cubes in arithmetic progression over quadratic fields.
          Archiv der Mathematik Vol. 95, no. 3, 233-241 (2010). pdf
          doi
- On the
                ubiquity of trivial torsion on elliptic curves 
          (joint with J.M. Tornero). Archiv der Mathematik Vol. 95, no. 2,
          135-141 (2010). pdf
          doi
        
- Arithmetic
                progressions of four squares over quadratic fields     
          (joint with J. Steuding). Publicationes Mathematicae Debrecen 77,
          1-2, 125-138 (2010). pdf
          doi
        
- On the
                modularity level of modular abelian varieties over number fields
          (joint with X. Guitart). Journal of
            Number Theory 130, no. 7, 1560-1570 (2010). pdf
          doi
        
- Galois
                theory, discriminants and torsion subgroup of elliptic curves
          (joint with I.
                García-Selfa and J.M. Tornero). Journal of Pure and Applied
                Algebra 214, 1340-1346 (2010).
            pdf
          doi
        
- Non-hyperelliptic
                modular curves of genus 3 (joint with R. Oyono).
            Journal of Number Theory 130, no. 4, 862-878 (2010). pdf
          doi
          
 
- Right
                triangles with algebraic sides and elliptic curves over number
                fields (joint with E. Girondo, G. González-Diez, R.
            Steuding and J. Steuding). Mathematica Slovaca 59, no. 3, 299-306
            (2009). pdf
          doi
        
- Finiteness
                Results for modular curves of genus at least 2 (joint
            with M. Baker, J. González and B. Poonen). American Journal of
            Mathematics 127, no. 6, 1325-1387, (2005). pdf
          doi
        
- On the
                Brauer class of modular endomorphism algebras (joint
            with E. Ghate and J. Quer). International Mathematics Research
            Notices 2005 no. 12, 701-723, (2005). pdf
          doi
        
- Modular
                curves of genus 2 (joint with J. González).
            Mathematics of Computation 72, no. 241, 397—418, (2003). pdf
          doi
           data
- Computations
                on Modular jacobians surfaces (joint with J. González
            and J. Guàrdia). Algorithmic number theory (Sydney, 2002), 189-197,
            LNCS 2369, Springer, Berlin, (2002). pdf
          doi
        
- Curves of genus 2 parametrized from modular
              curves (joint with J. González). Actas EACA VII, 177-185
            (2001).
 
 
       Books:
      
        - Proceedings of the Segundas Jornadas de Teoría
            de Números  (joint with J. Cilleruelo, A. Quirós, X. Xarles
          (eds.)). Biblioteca
            de la Revista Iberoamericana de Matemáticas vol.
            4 (2008). ISBN 978-84-612-8007-0.
- Curvas Hiperelípticas Modulares.
          Ph.D.thesis (in Spanish), January 2002. Abstract: English,
             Spanish
- Curvas elípticas: Grupo de puntos racionales y
            curvas de rango alto. Master thesis (in Spanish), January
          1998. pdf
       Software:
      
        - Modular Curves of Given Level and Genus. On
          Magma
            ≥ v2.18.
- Modular Curves of Given Level and Genus
            (Documentation) (joint with Michael Harrison). Handbook of
          Magma functions ≥ v.2.18-3 (2012). online
      Tables:
      
      
      Conference Organizer:
      
        - SAGE
            Days 16, Barcelona, 22-27 June 2009
- 40
            años de Algebra en las Autónomas, Madrid, 21-22 November 2008 
- Segundas
            Jornadas de Teoría de Números, Madrid, 16-19 July 2007 
- International
            Conference on Arithmetic Algebraic Geometry, El Escorial
          (Madrid), 4-8 September 2006 
- Décimas
            Jornadas de Teoría de Números, Madrid, 8-12 July 2024