26 citations · 144 across the 10 of their papers we have counts for
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T-dual cosmological solutions in double field theory
Robert Brandenberger, Renato Costa, Guilherme Franzmann +1
We investigate the cosmological solutions coming from the double field theory equations of motion after coupling a matter source to them. Assuming constant dilaton and imposing the…
Dual Space-Time and Nonsingular String Cosmology
Robert Brandenberger, Renato Costa, Guilherme Franzmann +1
Making use of the T-duality symmetry of superstring theory, and of the double geometry from Double Field Theory, we argue that cosmological singularities of a homogeneous and isotr…
Conformal inflation with chameleon coupling
Heliudson Bernardo, Renato Costa, Horatiu Nastase +1
We investigate the possibility that the inflaton, in particular in conformal inflation models, is also a chameleon, i.e. that it couples to the energy density of some heavy non-rel…
Point Particle Motion in DFT and a Singularity-Free Cosmological Solution
Robert Brandenberger, Renato Costa, Guilherme Franzmann +1
We generalize the action for point particle motion to a double field theory background. After deriving the general equations of motion for these particle geodesics, we specialize t…
On higher spin symmetries in de Sitter QFTs
Renato Costa, Ian A. Morrison
We consider the consequences of global higher-spin symmetries in quantum field theories on a fixed de Sitter background of spacetime dimension . These symmetries enhance t…
Can Back-Reaction Prevent Eternal Inflation?
Robert Brandenberger, Renato Costa, Guilherme Franzmann
We study the effects which the back-reaction of long wavelength fluctuations exert on stochastic inflation. In the cases of power-law and Starobinsky inflation these effects are to…