On a Geometrical Description of Quantum Mechanics (2009)
Novello, M., Salim, J. M., Falciano, F. T.
We show that Quantum Mechanics can be interpreted as a modification of the Euclidean nature of 3-d space into a particular Weyl affine space which we call Q-wis. This is proved using the Bohm-de...
Cyclic Magnetic Universe (2008)
Novello, M., Araujo, Aline N., Salim, J. M.
Recent works have shown the important role Nonlinear Electrodynamics (NLED) can have in two crucial questions of Cosmology, concerning particular moments of its evolution for very large and for...
Novello, M., Bergliaffa, S. E. Perez
We review the general features of nonsingular universes ({\em i.e.} those that go from an era of accelerated collapse to an expanding era without displaying a singularity) as well as cyclic...
The Static Gravitational Field Of A Spherically Symmetric Body (2007)
Novello Centro, M. Novello, Centro Brasileiro, Pesquisas Fisicas
We continue here the exam [1] of a theory of gravity that satisfies the Einstein Equivalence Principle (EEP) for any kind of matter/energy, except for the gravitational energy. This is part of a...
Laborat'orio de Cosmologia e F'isica Experimental de Altas Energias. (2007)
M. Novello, Centro Brasileiro, Rua Dr, Xavier Sigaud
General relativity can be formulated either as in its original geometrical version (Einstein, 1915) or as a field theory (Feynman, 1962). In the Feynman presentation of Einstein theory an hypothesis...
Cuesta, Herman J. Mosquera, Salim, Jose M., Novello, M.
By-now photons are the unique universal messengers. Cosmological sources like far-away galaxies or quasars are well-known light-emitters. Here we demonstrate that the nonlinear electrodynamics (NLED)...
Constructing Dirac linear fermions in terms of non-linear Heisenberg spinors (2007)
We show that the massive (or massless) neutrinos can be described as special states of Heisenberg nonlinear spinors. As a by-product of this decomposition a particularly attractive consequence...
A Spinor Theory of Gravity and the Cosmological Framework (2007)
Recently we have presented a new formulation of the theory of gravity based on an implementation of the Einstein Equivalence Principle distinct from General Relativity. The kinetic part of the theory...
Ivashchuk, V. D., Kononogov, S. A., Melnikov, V. N., Novello, M.
Exact solutions with an exponential behaviour of the scale factors are considered in a multidimensional cosmological model describing the dynamics of n+1 Ricci-flat factor spaces M_i in the presence...
Cosmological Effects of Nonlinear Electrodynamics (2006)
Novello, M., Goulart, E., Salim, J. M., Bergliaffa, S. E. Perez
It will be shown that a given realization of nonlinear electrodynamics, used as source of Einstein's equations, generates a cosmological model with interesting features, namely a phase of current...
Spinor Theory of Gravity (2006)
The proposal of this work is to provide an answer to the following question: is it possible to treat the metric of space-time - that in General Relativity (GR) describes the gravitational interaction...
Nonlinear electrodynamics and the Pioneer 10/11 spacecraft anomaly (2006)
Mbelek, Jean Paul, Cuesta, Herman J. Mosquera, Novello, M., Salim, Jose M.
The occurrence of the phenomenon known as photon acceleration is a natural prediction of nonlinear electrodynamics (NLED). This would appear as an anomalous frequency shift in any modeling of the...
A toy model for fake inflation (2006)
Novello, M., Huguet, E., Queva, J.
Discontinuities in non linear field theories propagate through null geodesics in an effective metric that depends on its dynamics and on the background geometry. Once information of the geometry of...
A toy model of a fake inflation (2006)
Novello, M., Huguet, E., Queva, J.
Discontinuities in non linear field theories propagate through null geodesics in an effective metric that depends on its dynamics and on the background geometry. Once information of the geometry of...
A toy model for fake inflation (2006)
Novello, M., Huguet, E., Queva, J.
Discontinuities in non linear field theories propagate through null geodesics in an effective metric that depends on its dynamics and on the background geometry. Once information of the geometry of...
The mass of the graviton and the cosmological constant puzzle (2005)
We propose an interpretation of the cosmological constant puzzle - i.e., the enormous value of the ratio $\rho_{Pl}/\rho_{vac} \approx 10^{120} $- in terms of the total number of gravitons in the...
Extended Born-Infeld Dynamics and Cosmology (2005)
Novello, M., Makler, M., Werneck, L. S., Romero, C. A.
We introduce an extension of the Born-Infeld action for a scalar field and show that it can act as unifying-dark-matter, providing an explanation for both structure formation and the accelerated...
Analysis of the static and spherically-symmetric solution in NDL theory of gravitation (2004)
Novello, M., Perez Bergliaffa, S. E., Hibberd, K. E.
We investigate the static solution with spherical symmetry of a member of a recently proposed class of field theories of gravitation. In this so-called NDL theory, matter interacts with gravity in...
Analysis of the static and spherically-symmetric solution in NDL theory of gravitation (2004)
Novello, M., Perez Bergliaffa, S. E., Hibberd, K. E.
We investigate the static solution with spherical symmetry of a member of a recently proposed class of field theories of gravitation. In this so-called NDL theory, matter interacts with gravity in...
Non-linear electrodynamics and the acceleration of the universe (2003)
Novello, M., Bergliaffa, S. E. Perez, Salim, J.
It is shown that the addition of a non-linear term to the Lagrangian of the electromagnetic field yields a fluid with an asymptotically super-negative equation of state, causing an accelerated...
The stability of a bouncing universe (2003)
We investigate the stability of a spatially homogeneous and isotropic non-singular cosmological model. We show that the complete set of independent perturbations (the electric part of the perturbed...
Reply to "Acausality of Massive Charged Spin 2 Fields" (2003)
Novello, M., Bergliaffa, S. E. Perez, Neves, R. P.
We show that, contrary to the claim in hep-th/0304050, the propagation of a spin-2 field in an electromagnetic background is {\em causal}.
Causality and charged spin-2 fields in an electromagnetic background (2003)
Novello, M., Bergliaffa, S. E. Perez, Neves, R. P.
We show that, contrary to common belief, the propagation of a spin-2 field in an electromagnetic background is {\em causal}. The proof will be given in the Fierz formalism which, as we shall see, is...
Novello, M., Bergliaffa, S. E. Perez
We introduce the concept of effective geometry by studying several systems in which it arises naturally. As an example of the power and conciseness of the method, it is shown that a flowing...
Geometrical description of spin-2 fields (2002)
We show that the torsion of a Cartan geometry can be associated to two spin-2 fields. This structure allows a new approach to deal with the proposal of geometrization of spin-2 fields besides the...
The cosmological dependence of weak interactions (2002)
A model for the cosmological time dependence of weak interactions is discused and some experimental tests suggested.
The mass of the graviton and the cosmological constant (2002)
We show that the graviton acquires a mass in a de Sitter background given by $m_{g}^{2}=-{2/3}\Lambda.$ This is precisely the fine-tuning value required for the perturbed gravitational field to...
Analysis of static and spherically-symmetric solutions in NDL theory of gravitation (2002)
Novello, M., Bergliaffa, S. E. Perez, Hibberd, K. E.
We investigate a static solution with spherical symmetry of a recently proposed field theory of gravitation. In this so-called NDL theory, matter interacts with gravity in accordance with the Weak...
Time-dependent cosmological constant in the Jackiw-Teitelboim cosmology (2002)
Alves, M., Barcelos-Neto, J., Novello, M., Salim, J. M.
We study the obtainment of a time-dependent cosmological constant at D=2 in a model based on the Jackiw-Teitelboim cosmology. We show that the cosmological term goes to zero asymptotically and can...
Spin-2 field theory in curved spacetime (2002)
We present a new formulation to deal with the consistency problem of a massive spin-2 field in a curved spacetime. Using Fierz variables to represent the spin-2 field, we show how to avoid the...
Novello, M., Barcelos-Neto, J., Salim, J. M.
We use a model where the cosmological term can be related to the chiral gauge anomaly of a possible quantum scenario of the initial evolution of the universe. We show that this term is compatible...
Analog black holes in flowing dielectrics (2002)
Novello, M., Bergliaffa, S. Perez, Salim, J., De Lorenci, V., Klippert, R.
We show that a flowing dielectric medium with a linear response to an external electric field can be used to generate an analog geometry that has many of the formal properties of a Schwarzschild...
New constraints on ultrashort-ranged Yukawa interactions from atomic force microscopy (2001)
Fischbach, E., Krause, D. E., Mostepanenko, V. M., Novello, M.
Models in which the gravitational and gauge interactions are unified at ~1 TeV lead to the possibility that large extra dimensions would produce Yukawa-type corrections to the Newtonian gravitational...
Dyadosphere bending of light (2001)
De Lorenci, V. A., Figueiredo, N., Fliche, H. H., Novello, M.
In the context of the static and spherically symmetric solution of a charged compact object, we present the expression for the bending of light in the region just outside the event horizon (the...
Mostepanenko, V. M., Novello, M.
Constraints on the Yukawa-type corrections to Newtonian gravitational law are obtained resulting from the measurement of the Casimir force between two crossed cylinders. The new constraints are...
Mostepanenko, V. M., Novello, M.
The recent ideas that the gravitational and gauge interactions become united at the weak scale lead to Yukawa-type corrections to the Newtonian gravitational law at small distances. We briefly...
A model for time-dependent cosmological constant (2000)
Novello, M., Barcelos-Neto, J., Salim, J. M.
We present a model for a spacetime dependent cosmological {\it constant}. We make a realization of this model based on a possible quantum aspects of the initial stage of the universe and relate the...
Light propagation in non linear electrodynamics (2000)
De Lorenci, V. A., Klippert, R., Novello, M., Salim, J. M.
Working on the approximation of low frequency, we present the light cone conditions for a class of theories constructed with the two gauge invariants of the Maxwell field without making use of...
Closed Lightlike Curves in Non-linear Electrodynamics (2000)
Novello, M., De Lorenci, V. A., Elbaz, E., Salim, J. M.
We show that non-linear electrodynamics may induce a photon to follow a closed path in spacetime. We exhibit a specific case in which such closed lightlike curve (CLC) appears
A nongravitational wormhole (2000)
Baldovin, F., Novello, M., Bergliaffa, S. E. Perez, Salim, J. M.
Using the effective metric formalism for photons in a nonlinear electromagnetic theory, we show that a certain field configuration in Born-Infeld electromagnetism in flat spacetime can be interpreted...
Singularities in General Relativity coupled to nonlinear electrodynamics (2000)
Novello, M., Bergliaffa, S. E. Perez, Salim, J. M.
We study here some consequences of the nonlinearities of the electromagnetic field acting as a source of Einstein's equations on the propagation of photons. We restrict to the particular case of a...
The Velocity of Gravitational Waves (2000)
Novello, M., De Lorenci, V. A., De Freitas, Luciane R., Aguiar, O. D.
We examine the propagation of gravitational waves in the new field theory of gravitation recently proposed by Novello-De Lorenci-Luciane (NDL). This examination is done on a solvable case...
Geometrical aspects of light propagation in nonlinear electrodynamics (1999)
Novello, M., De Lorenci, V. A., Salim, J. M., Klippert, R.
We analyze the propagation of light in the context of nonlinear electrodynamics, as it occurs in modified QED vacua. We show that the corresponding characteristic equation can be described in terms...
On the self-consistence of electrodynamics in the early universe (1998)
Klippert, R., De Lorenci, V. A., Novello, M., Salim, J. M.
The issue of a self-consistent solution of Maxwell-Einstein equations achieves a very simple form when all quantum effects are neglected but a weak vacuum polarization due to an external magnetic...
Nonlinear electrodynamics and FRW cosmology (1998)
De Lorenci, V. A., Klippert, R., Novello, M., Salim, J. M.
Maxwell electrodynamics, considered as a source of the classical Einstein field equations, leads to the singular isotropic Friedmann solutions. We show that this singular behavior does not occur for...
The velocity of gravitational waves (1998)
Novello, M, De Lorenci, V A, Luciane, R, De Freitas, R, Aguiar, O D
The Binary Pulsar Is Not the Ultimate Test for the Theory of Gravity (1997)
Novello, M., De Lorenci, V. A.
General relativity can be formulated either as in its original geometrical version (Einstein, 1915) or as a field theory (Feynman, 1962). In the Feynman presentation of Einstein theory an hypothesis...
Novello, M., De Lorenci, V. A., Elbaz, E.
In this paper we present a new model for a gauge field theory such that self-interacting spin-one particles can be confined in a compact domain. The necessary conditions to produce the confinement...
Can Non Gravitational Black Holes Exists? (1997)
Novello, M., De Lorenci, V. A., Elbaz, E.
We claim that the existence of a mechanism such that photons may be trapped in a compact domain is not an exclusive property of gravitational forces. We show the case in which a non-linear...
Hamiltonian formulation of FRW equations of cosmology (1996)
Elbaz, E, Novello, M, Salim, J M, Motta Da Silva, M C, Klippert, R
The Static Gravitational Field of a Spherically Symmetric Body (1995)
Novello, M., Freitas, L. R., De Lorenci, V. A.
We continue here the exam \cite{LuMa} of a theory of gravity that satisfies the Einstein Equivalence Principle (EEP) for any kind of matter/energy, except for the gravitational energy. This is part...
What is the Velocity of Gravitational Waves? (1995)
De Freitas, Luciane R., Novello, M.
We present a new field theory of gravity. It incorporates a great part of General Relativity (GR) and can be interpreted in the standard geometrical way like GR as far as the interaction of matter to...
Minimal Closed Set of Observables in the Theory of Cosmological Perturbations (1994)
Novello, M., Salim, J. M., Joras, S. E., Klippert, R.
The theory of perturbation of Friedman-Robertson-Walker (FRW) cosmology is analysed exclusively in terms of observable quantities. Although this can be a very complete and general procedure we limit...