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- Felipe Ruiz
- 2000

It is argued that the quadratic and linear non-commutative IR divergences that occur in U(1) theory on non-commutative Minkowski spacetime for small non-commutativity matrices θ are gauge-fixing… (More)

- Felipe Ruiz
- 2000

U(1) gauge theory on non-commutative Minkowski space-time in the Feynman-'t Hooft background gauge is studied. In particular, UV divergences and non-commutative IR divergent contributions to the two,… (More)

- Felipe Ruiz
- 2002

Noncommutative IR singularities and UV/IR mixing in relation with the Goldstone theorem for complex scalar field theory are investigated. The classical model has two coupling constants, λ1 and λ2 ,… (More)

- V. Gayral, J. M. Gracia-Bond́ıa, Felipe Ruiz
- 2004

It is argued that the one-loop effective action for space-like noncommutative (i) λϕ 4 scalar field theory and (ii) U (1) gauge theory does not exist. This indicates that such theories are not… (More)

- V. Gayral, J. M. Gracia-Bond́ıa, Felipe Ruiz
- 2005

We look in Euclidean R4 for associative star products realizing the commutation relation [xμ, xν ] = iΘμν(x), where the noncommutativity parameters Θμν depend on the position coordinates x. We do… (More)

- J. M. Gracia-Bond́ıa, Felipe Ruiz, Fedele Lizzi, Patrizia Vitale
- 2006

We prove that the Moyal product is covariant under linear affine spacetime transformations. From the covariance law, by introducing an x; -space where the spacetime coordinates and the… (More)

- Jose R. Rodriguez, Felipe Ruiz, Domingo Biel, Francesc Guinjoan
- Proceedings of 2010 IEEE International Symposium…
- 2010

Power quality of electric networks with high penetration of photovoltaic systems has been analyzed in different publications. It has been noted that inverters may increase their harmonic emissions… (More)

- J Dydak, Felipe Ruiz, Del Portal
- 2004

A morphism of a category which is simultaneously an epi-morphism and a monomorphism is called a bimorphism. In [11] we gave characterizations of monomorphisms (resp. epimorphisms) in arbitrary… (More)

- Felipe Ruiz
- J. Comb. Theory, Ser. A
- 1974

A method of sum composition for construction of orthogona Latin squares was introduced by A. Hedayat and E. Seiden [l]. In this paper we exhibit procedures for constructing a pair of orthogonal Latin… (More)

- G. Giavarini, Christopher Phillip Martin, Felipe Ruiz
- 1992

where A is the gauge connection on P → M and Tr represents a G -invariant bilinear form on g , the Lie algebra of G . In the following we shall assume G = SU(N) and A taking values in the fundamental… (More)