673 citations · 3.6k across the 100 of their papers we have counts for
73 papers · 1 filter
Axionic and nonaxionic electrodynamics in plane and circular geometry
Iver Brevik, Amedeo M. Favitta, Masud Chaichian
Various aspects of axion electrodynamics in the presence of a homogeneous and isotropic dielectric medium are discussed. 1. We consider first the "antenna-like" property of a plana…
Spin-1/2 "bosons'' with mass dimension 3/2 and fermions with mass dimension 1 cannot represent physical particle states
A. R. Aguirre, M. M. Chaichian, B. A. Couto e Silva +1
We delve into the first principles of quantum field theory to prove that the so-called spin-1/2 ''bosons'' and the fermions with mass dimension 1, including ELKO, cannot represent…
Seiberg-Witten Map with Lorentz-Invariance and Gauge-Covariant Star Product
M. Chaichian, M. N. Mnatsakanova, M. Oksanen
We develop the Seiberg-Witten map using the gauge-covariant star product with the noncommutativity tensor . The latter guarantees the Lorentz invariance of the theory. T…
Towards an Axiomatic Formulation of Noncommutative Quantum Field Theory. II
M. Chaichian, M. N. Mnatsakanova, Yu. S. Vernov
Classical results of the axiomatic quantum field theory, namely the irreducibility of the set of field operators, Reeh and Schlieder's theorems and generalized Haag's theorem, are…
Sakharov's induced gravity and the Poincaré gauge theory
Masud Chaichian, Markku Oksanen, Anca Tureanu
We explore Sakharov's seminal idea that gravitational dynamics is induced by the quantum corrections from the matter sector. This was the starting point of the view that gravity ha…
Condition for confinement in non-Abelian gauge theories
Masud Chaichian, Marco Frasca
We show that a criterion for confinement, based on the BRST invariance, holds in four dimensions, by solving a non-Abelian gauge theory with a set of exact solutions. The confineme…
Mimetic dark matter, ghost instability and a mimetic tensor-vector-scalar gravity
Masud Chaichian, Josef Kluson, Markku Oksanen +1
Recently modified gravitational theories which mimic the behaviour of dark matter, the so-called "Mimetic Dark Matter", have been proposed. We study the consistency of such theorie…
Can TeVeS be a viable theory of gravity?
Masud Chaichian, Josef Kluson, Markku Oksanen +1
Among modified gravitational theories, the Tensor-Vector-Scalar (TeVeS) occupies a special place -- it is a covariant theory of gravity that produces the modified Newtonian dynamic…
Electromagnetic interaction in theory with Lorentz invariant CPT violation
Masud Chaichian, Kazuo Fujikawa, Anca Tureanu
An attempt is made to incorporate the electromagnetic interaction in a Lorentz invariant but CPT violating non-local model with particle-antiparticle mass-splitting, which is regar…
Lorentz-invariant CPT violation
Masud Chaichian, Kazuo Fujikawa, Anca Tureanu
A Lorentz-invariant CPT violation, which may be termed as long-distance CPT violation in contrast to the familiar short-distance CPT violation, has been recently proposed. This sch…
Lorentz invariant CPT violation: Particle and antiparticle mass splitting
Masud Chaichian, Kazuo Fujikawa, Anca Tureanu
The interpretation of neutrino oscillation data has led to the question whether, in principle, an antiparticle like antineutrino can have a different mass than its particle. In the…
On entropic gravity: the entropy postulate, entropy content of screens and relation to quantum mechanics
Masud Chaichian, Markku Oksanen, Anca Tureanu
We consider the controversial hypothesis that gravity is an entropic force that has its origin in the thermodynamics of holographic screens. Several key aspects of entropic gravity…
CPT Violation Does Not Lead to Violation of Lorentz Invariance and Vice Versa
Masud Chaichian, Alexander D. Dolgov, Victor A. Novikov +1
We present a class of interacting nonlocal quantum field theories, in which the CPT invariance is violated while the Lorentz invariance is present. This result rules out a previous…
On gravity as an entropic force
Masud Chaichian, Markku Oksanen, Anca Tureanu
We consider E. Verlinde's proposal that gravity is an entropic force -- we shall call this theory entropic gravity (EG) -- and reanalyze a recent claim that this theory is in contr…
Hamiltonian analysis of non-projectable modified F(R) Hořava-Lifshitz gravity
Masud Chaichian, Markku Oksanen, Anca Tureanu
We study a version of the recently proposed modified Hořava-Lifshitz gravity that abandons the projectability condition of the lapse variable. We discovered that the project…
Massless Chiral Supermultiplets of Higher Spins and the -Twistor
M. Chaichian, A. Tureanu, A. A. Zheltukhin
Recently N. Berkovits, motivated by the supertwistor description of super Yang-Mills, considered the generalization of the -twistor constructio…
Modified first-order Horava-Lifshitz gravity: Hamiltonian analysis of the general theory and accelerating FRW cosmology in power-law F(R) model
Sante Carloni, Masud Chaichian, Shin'ichi Nojiri +3
We propose the most general modified first-order Hořava-Lifshitz (HL) gravity, whose action does not contain time derivatives higher than the second order. The Hamiltonian structur…
Modified F(R) Horava-Lifshitz gravity: a way to accelerating FRW cosmology
Masud Chaichian, Shin'ichi Nojiri, Sergei D. Odintsov +2
We propose a general approach for the construction of modified gravity which is invariant under foliation-preserving diffeomorphisms. Special attention is paid to the formulation o…
Can Seiberg-Witten Map Bypass Noncommutative Gauge Theory No-Go Theorem?
M. Chaichian, P. Presnajder, M. M. Sheikh-Jabbari +1
There are strong restrictions on the possible representations and in general on the matter content of gauge theories formulated on noncommutative Moyal spaces, termed as noncommuta…
Gauge field theories with covariant star-product
M. Chaichian, A. Tureanu, G. Zet
A noncommutative gauge theory is developed using a covariant star-product between differential forms defined on a symplectic manifold, considered as the space-time. It is proven th…
Dirac Equation in Noncommutative Space for Hydrogen Atom
T. C. Adorno, M. C. Baldiotti, M. Chaichian +2
We consider the energy levels of a hydrogen-like atom in the framework of -modified, due to space noncommutativity, Dirac equation with Coulomb field. It is shown that on the no…
Noncommutativity and Ramond-Ramond fields
Masud Chaichian, Dimitri Polyakov, Anca Tureanu
We study the properties of the Ramond fields in superstring theory in the presence of a constant B-field and the subsequent implications of space-time noncommutativity for space-ti…
Dirac Quantization Condition for Monopole in Noncommutative Space-Time
Masud Chaichian, Subir Ghosh, Miklos Langvik +1
Since the structure of space-time at very short distances is believed to get modified possibly due to noncommutativity effects and as the Dirac Quantization Condition (DQC), $μe =…
Gauging the twisted Poincare symmetry as noncommutative theory of gravitation
M. Chaichian, M. Oksanen, A. Tureanu +1
Einstein's Theory of General Relativity was formulated as a gauge theory of Lorentz symmetry by Utiyama in 1956, while the Einstein-Cartan gravitational theory was formulated by Ki…