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Inhomogeneous and interacting vacuum energy
Josue De-Santiago, David Wands, Yuting Wang
Vacuum energy is a simple model for dark energy driving an accelerated expansion of the universe. If the vacuum energy is inhomogeneous in spacetime then it must be interacting. We…
Curvaton and the inhomogeneous end of inflation
Hooshyar Assadullahi, Hassan Firouzjahi, Mohammad Hossein Namjoo +1
We study the primordial density perturbations and non-Gaussianities generated from the combined effects of an inhomogeneous end of inflation and curvaton decay in hybrid inflation.…
Loop corrections and a new test of inflation
Gianmassimo Tasinato, Christian T. Byrnes, Sami Nurmi +1
Inflation is the leading paradigm for explaining the origin of primordial density perturbations and the observed temperature fluctuations of the cosmic microwave background. Howeve…
Primordial non-Gaussianity from mixed inflaton-curvaton perturbations
José Fonseca, David Wands
We characterise the primordial perturbations produced due to both inflaton and curvaton fluctuations in models where the curvaton has a quadratic, cosine or hyperbolic potential, a…
Inhomogeneous vacuum energy
David Wands, Josue De-Santiago, Yuting Wang
Vacuum energy remains the simplest model of dark energy which could drive the accelerated expansion of the Universe without necessarily introducing any new degrees of freedom. Inho…
Cosmological phase space analysis of the F (X) - V (phi) scalar field and bouncing solutions
Josue De-Santiago, Jorge L. Cervantes-Cota, David Wands
We analyze the dynamical system defined by a universe filled with a barotropic fluid plus a scalar field with modified kinetic term of the form L = F (X) - V (phi). After a suitabl…