81 citations · 626 across the 33 of their papers we have counts for
9 papers · 1 filter
Closed String Tachyon: Inflation and Cosmological Collapse
Celia Escamilla-Rivera, Gerardo Garcia-Jimenez, Oscar Loaiza-Brito +1
By compactifying a critical bosonic string theory on an internal non-flat space with a constant volume, we study the role played by the closed string tachyon in the cosmology of th…
Can noncommutative effects account for the present speed up of the cosmic expansion?
Octavio Obregon, Israel Quiros
In this paper we investigate to which extent noncommutativity, a intrinsically quantum property, may influence the Friedmann-Robertson-Walker cosmological dynamics at late times/la…
Supersymmetric classical cosmology
Celia Escamilla-Rivera, Octavio Obregon, L. Arturo Urena-Lopez
In this work a supersymmetric cosmological model is analyzed in which we consider a general superfield action of a homogeneous scalar field supermultiplet interacting with the scal…
WKB-type Approximation to Noncommutative Quantum Cosmology
E. Mena, O. Obregon, M. Sabido
In this work, we develop and apply the WKB approximation to several examples of noncommutative quantum cosmology, obtaining the time evolution of the noncommutative universe, this…
Time and "angular" dependent backgrounds from stationary axisymmetric solutions
Octavio Obregon, Hernando Quevedo, Michael P. Ryan
Backgrounds depending on time and on "angular" variable, namely polarized and unpolarized Gowdy models, are generated as the sector inside the horizons of the mani…
Can primordial wormholes be induced by GUTs at the early Universe?
S. Nojiri, O. Obregon, S. D. Odintsov +1
Using large N, 4d anomaly induced one-loop effective action for conformally invariant matter (typical GUT multiplet) we study the possibility to induce the primordial spherically s…