50 citations · 230 across the 14 of their papers we have counts for
7 papers · 1 filter
Inflation from IIB Superstrings with Fluxes
Erandy Ramirez, Tonatiuh Matos
We study the conditions needed to have an early epoch of inflationary expansion with a potential coming from IIB superstring theory with fluxes involving two moduli fields. The phe…
Flow equations in generalized braneworld scenarios
Gianluca Calcagni, Andrew R. Liddle, Erandy Ramirez
We discuss the flow equations in the context of general braneworld cosmologies with a modified Friedmann equation, for either an ordinary scalar field or a Dirac-Born-Infeld tachyo…
Stochastic approaches to inflation model building
Erandy Ramirez, Andrew R Liddle
While inflation gives an appealing explanation of observed cosmological data, there are a wide range of different inflation models, providing differing predictions for the initial…
Braneworld flow equations
Erandy Ramirez, Andrew R Liddle
We generalize the flow equations approach to inflationary model building to the Randall-Sundrum Type II braneworld scenario. As the flow equations are quite insensitive to the expa…
Inflationary slow-roll formalism and perturbations in the Randall-Sundrum Type II braneworld
Erandy Ramirez, Andrew R. Liddle
We formalize the Hubble slow-roll formalism for inflationary dynamics in Randall-Sundrum Type II braneworld cosmologies, defining Hubble slow-roll parameters which can be used alon…
Geometric Conditions on the Type of Matter Determining the Flat Behavior of the Rotational Curves in Galaxies
Tonatiuh Matos, Dario Nunez, F. Siddhartha Guzman +1
In an arbitrary axisymmetric stationary spacetime, we determine the expression for the tangential velocity of test objects following a circular stable geodesic motion in the equato…