139 citations · 232 across the 8 of their papers we have counts for
8 papers
Scalar Field Oscillations Contributing to Dark Energy
Eduard Masso, Francesc Rota, Gabriel Zsembinszki
We use action-angle variables to describe the basic physics of coherent scalar field oscillations in the expanding universe. These analytical mechanics methods have some advantages…
On the Gravitational Field of Antimatter
Eduard Masso, Francesc Rota
The gravitational field of matter and that of antimatter could differ. This might be one signature of quantum gravity. We show that primordial Big Bang Nucleosynthesis restricts su…
Planck-Scale Effects on Global Symmetries: Cosmology of Pseudo-Goldstone Bosons
Eduard Masso, Francesc Rota, Gabriel Zsembinszki
We consider a model with a small explicit breaking of a global symmetry, as suggested by gravitational arguments. Our model has one scalar field transforming under a non-anomalous…
Primordial Nucleosynthesis as a Test of the Friedmann Equation in the Early Universe
Eduard Massó, Francesc Rota
In the standard hot big bang model, the expansion of the early universe is given by the Friedmann equation with an energy density dominated by relativistic particles. Since in a va…
On Axion Thermalization in the Early Universe
Eduard Masso, Francesc Rota, Gabriel Zsembinszki
We reanalyze the conditions under which we have a primordial thermal population of axions. Compared with previous studies, we find other processes, involving gluons and quarks, tha…
Primordial Helium Production in a Charged Universe
Eduard Masso, Francesc Rota
We use the constraints arising from primordial nucleosynthesis to bound a putative electric charge density of the universe. We find , four ord…
Summing the derivative expansion of the effective action
Eduard Masso, Francesc Rota
The derivative expansion of the effective action is a perturbative development in derivatives of the fields. The expansion breaks down when some of the derivatives are too large. W…
Neutrino-photon reactions for energies above
Eduard Masso, Francesc Rota
We show that neutrino-photon reactions above are dominated by the reaction . We calculate its cross-section and see that it is larger by several orders of mag…