10 citations · 37 across the 13 of their papers we have counts for
13 papers
A Buchdahl solution generator for Einstein-sigma gravity and multiscalar-tensor gravity
David S. Pereira, Francisco S. N. Lobo, José Pedro Mimoso
Buchdahl transformations provide a geometric route from vacuum spacetimes to scalar-field solutions. We formulate this mechanism as a target-covariant solution generator for Einste…
Differential Obstructions to Curvature-Dependent Conformal Transformations
David S. Pereira, Francisco S. N. Lobo, José Pedro Mimoso
Curvature-dependent conformal rules are local forward assignments on known metrics, but they are not generically local changes of metric variables. We study the nondegenerate class…
Thermal channels of scalar and tensor waves in Jordan-frame scalar--tensor gravity
David S. Pereira, Francisco S. N Lobo, José Pedro Mimoso
We study first-order scalar and tensor perturbations of Jordan-frame scalar--tensor gravity about a spatially flat FLRW background using the Einstein-like effective-fluid decomposi…
Novel scalar degrees of freedom emerging from hybrid metric-Palatini gravity
David S. Pereira, Salvatore Capozziello, Francisco S. N Lobo +1
Hybrid metric-Palatini gravity unifies the metric and Palatini formalisms while preserving a propagating scalar degree of freedom, offering a compelling route to modified gravity c…
Big Bang Nucleosynthesis constraints on gravity
Daniel F. P. Cruz, David S. Pereira, Francisco S. N. Lobo +1
We investigate Big Bang Nucleosynthesis (BBN) in the framework of gravity, where the gravitational Lagrangian depends on the torsion scalar and the matter Lagrangian…
Gravitational baryogenesis in gravity
Daniel F. P. Cruz, David S. Pereira, Francisco S. N. Lobo
The observed matter-antimatter asymmetry of the Universe remains a fundamental challenge in modern physics. In this work, we explore gravitational baryogenesis within the framework…