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9 papers · 2 filters
Cosmological Constant and Local Gravity
Jose Bernabeu, Catalina Espinoza, Nick E. Mavromatos
We discuss the linearization of Einstein equations in the presence of a cosmological constant, by expanding the solution for the metric around a flat Minkowski space-time. We demon…
Positioning systems in Minkowski space-time: from emission to inertial coordinates
Bartolomé Coll, Joan Josep Ferrando, Juan Antonio Morales-Lladosa
The coordinate transformation between emission coordinates and inertial coordinates in Minkowski space-time is obtained for arbitrary configurations of the emitters. It appears tha…
Inflation, quantum fields, and CMB anisotropies
Ivan Agullo, Jose Navarro-Salas, Gonzalo J. Olmo +1
Inflationary cosmology has proved to be the most successful at predicting the properties of the anisotropies observed in the cosmic microwave background (CMB). In this essay we sho…
Dynamical Aspects of Generalized Palatini Theories of Gravity
Gonzalo J. Olmo, Helios Sanchis-Alepuz, Swapnil Tripathi
We study the field equations of modified theories of gravity in which the lagrangian is a general function of the Ricci scalar and Ricci-squared terms in Palatini formalism. We sho…
Cosmological Horizon Modes and Linear Response in de Sitter Spacetime
Paul R. Anderson, Carmen Molina-Paris, Emil Mottola
Linearized fluctuations of quantized matter fields and the spacetime geometry around de Sitter space are considered in the case that the matter fields are conformally invariant. Ta…
Bouncing Cosmologies in Palatini Gravity
Carlos Barragan, Gonzalo J. Olmo, Helios Sanchis-Alepuz
We consider the early time cosmology of f(R) theories in Palatini formalism and study the conditions that guarantee the existence of homogeneous and isotropic models that avoid the…