34 citations · 198 across the 27 of their papers we have counts for
21 papers · 1 filter
Particle Creation in some LRS Bianchi I models
Luis O. Pimentel, Flavio Pineda
In this work we consider particle creation by the expansion of the universe, using two Bianchi type I anisotropic models. The particles studied are of spin 0 and 1/2. The cosmologi…
Cosmologies with scalar fields from higher dimensions applied to Bianchi type model: classical and quantum solutions
J. Socorro, L. Toledo Sesma, Luis O. Pimentel
In this work we construct an effective four-dimensional model by compactifying a ten-dimensional theory of gravity coupled with a real scalar dilaton field on a time-dependent toru…
Some exact solutions in K-essence theory isotropic cosmology
Luis O. Pimentel, Carlos E. Gabarrete
We use a simple form of the K-essence theory and apply it to the classic isotropic cosmological model and seek exact solutions. The particular form of the kinetic term that we choo…
Classical Bianchi type I cosmology in K-essence theory
J. Socorro, Luis O. Pimentel, Abraham Espinoza-García
We use one of the simplest forms of the K-essence theory and we apply it to the classical anisotropic Bianchi type I cosmological model, with a barotropic perfect fluid modeling th…
Quintom potentials from quantum cosmology using the FRW cosmological model
J. Socorro, Priscila Romero, Luis O. Pimentel +1
We construct the quintom potential of dark energy models in the framework of spatially flat Friedmann-Robertson Walker universe in the inflationary epoch, using the Bohm like appro…
Cosmological Bianchi Class A models in Sáez-Ballester theory
J. Socorro, Paulo A. Rodríguez, Abraham Espinoza-García +2
We use the Sáez-Ballester (SB) theory on anisotropic Bianchi Class A cosmological model, with barotropic fluid and cosmological constant, using the Hamilton or Hamilton-Jacobi appr…
Scalar field in the Bianchi I: Non commutative classical and Quantum Cosmology
J. Socorro, Luis O. Pimentel, C. Ortiz +1
Using the ADM formalism in the minisuperspace, we obtain the commutative and noncommutative exact classical solutions and exact wave function to the Wheeler-DeWitt equation with an…
The Einstein-Hamilton-Jacobi equation: Searching the classical solution for barotropic FRW
S. R. Berbena, A. V. Berrocal, J. Socorro +1
The dynamical evolution of the scale factor of FRW cosmological model is presented, when the equation of state of the material content assume the form , ,…
Noncommutative Quantum Cosmology
Luis O. Pimentel, Cesar Mora
We consider noncommutative quantum cosmology in the case of the low-energy string effective theory. Exacts solutions are found and compared with the commutative case.The Noncommuta…
Required Conditions for Late Time Acceleration and Early Time Deceleration in Generalized Scalar-Tensor Theories
L. M. Diaz-Rivera, Luis O. Pimentel
We consider a generalized scalar-tensor theory, where we let the coupling function and the effective cosmological constants undetermined. We obtain general expression…
Bianchi I Quantum cosmology in the Bergmann-Wagoner theory
Luis O. Pimentel
The Wheeler-DeWitt equation is considered in the context of generalized scalar-tensor theories of gravitation for Bianchi type I cosmology. Exact solutions are found for two selfin…
Quantum Cosmology in Bergmann-Wagoner Scalar-tensor Gravitational Theory
Luis O. Pimentel, Cesar Mora
The Wheeler-DeWitt equation is solved for the Bergmann-Wagoner scalar-tensor gravitational theory in the case of Friedmann-Robertson- Walker cosmological model. We present solution…
Third Quantization of Brans-Dicke Cosmology
Luis O. Pimentel, Cesar Mora
We study the third quantization of a Brans-Dicke toy model, we calculate the number density of the universes created from nothing and found that it has a Planckian form. Also, we c…
Cosmological models with dynamical lambda in scalar-tensor theories
L. M. Diaz-Rivera, L. O. Pimentel
In the context of a family os scalar-tensor theories with a dynamical , that is a binomial on the scalar field, the cosmological equations are considered. A general barotropic s…
Inhomogeneous String Cosmology Solutions with Regular Spacetime Curvature
Luis O. Pimentel
In this work cosmological models are considered for the low energy string cosmological effective action (tree level) in the absence of dilaton potential. A two parametric non-diago…
Quantum Cosmology in some Scalar-tensor Theories
Luis O. Pimentel, César Mora
The Wheeler-DeWitt equation is solved for some scalar-tensor theories of gravitation in the case of homogeneous and isotropic cosmological models.We present general solutions corre…
Classical solutions in five dimensional induced matter theory and its relation to an imperfect fluid
J. Socorro, V. M. Villanueva, Luis O. Pimentel
We study five dimensional cosmological models with four dimensional hypersufaces of the Bianchi type I and V. In this way the five dimensional vacuum field equations $\rm G_{AB} =…
Essential self-adjointness in one-loop quantum cosmology
Giampiero Esposito, Hugo A. Morales-Tecotl, Luis O. Pimentel
The quantization of closed cosmologies makes it necessary to study squared Dirac operators on closed intervals and the corresponding quantum amplitudes. This paper proves self-adjo…
Cosmic Strings from N=2, D=5 Supergravity
Pimentel L O
Exact solutions of N=2 supergravity in five dimensions are found in the metric with cylindrical symmetry, a particular case corresponds to the exterior of a cosmic string.
Weyl Equation in GÖdel Type Universes
Pimentel L O, Camacho A, Macias A
The Weyl equation (massless Dirac equation) is studied in a family of metrics of the Gödel type. The field equation is solved exactly for one member of the family.
Quantum Cosmology for a Quadratic Theory of Gravity
Pimentel L O, Obregon O
For pure fourth order () quantum cosmology the Wheeler-DeWitt equation is solved exactly for the closed homogeneous and isotropic model. It is shown that by…