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…
Baryon asymmetry from higher-order matter contributions in gravity
David S. Pereira, Francisco S. N. Lobo, José Mimoso
We investigate the observed asymmetry between matter and antimatter by incorporating higher-order matter contributions in gravity, specifically analyzing gravitational baryogenesis…
Thermodynamics of the Primordial Universe
David S. Pereira, João Ferraz, Francisco S. N. Lobo +1
This review delves into the pivotal primordial stage of the universe, a period that holds the key to understanding its current state. To fully grasp this epoch, it is essential to…
Gravitational Baryogenesis in Energy-Momentum Squared~Gravity
David S. Pereira, Francisco S. N. Lobo, José Pedro Mimoso
We demonstrate that the matter sector itself can drive baryogenesis in energy-momentum squared gravity, with . High-density mat…
Extension of Buchdahl's Theorem on Reciprocal Solutions
David S. Pereira, José Pedro Mimoso, Francisco S. N. Lobo
Since the development of Brans-Dicke gravity, it has become well-known that a conformal transformation of the metric can reformulate this theory, transferring the coupling of the s…
Time-reversed information flow through a wormhole in scalar-tensor gravity
Hoang Ky Nguyen, Francisco S. N. Lobo
This Letter aims to advance unexplored properties of a new class of Closed Timelike Curves recently discovered in scalar-tensor gravity, reported in Universe 9, 467 (2023) and Eur.…
Baryogenesis: A Symmetry Breaking in the Primordial Universe Revisited
David S. Pereira, João Ferraz, Francisco S. N. Lobo +1
In this review article, we revisit the topic of baryogenesis, which is the physical process that generated the observed baryon asymmetry during the first stages of the primordial U…
Closed Timelike Curves Induced by a Buchdahl-inspired Vacuum Spacetime in Gravity
Hoang Ky Nguyen, Francisco S. N. Lobo
The recently obtained Buchdahl-inspired metric [Phys. Rev. D 107, 104008 (2023)] describes asymptotically flat spacetimes in pure Ricci-squared gravity. The metr…