3 papers
hep-ph2026
Cosmological Constraints on Long-Lived Particles Using Dimension-Six Effective Operators
Mickael V. S. de Farias, Rodrigo Holanda, Matheus M. A. Paixao +2
Long-lived particles (LLPs) provide an interesting window into physics beyond the Standard Model, offering characteristic signatures at colliders and in cosmology. In this work, we…
hep-ph2025
Updated BBN Bounds on Hadronic Injection in the Early Universe: The Gravitino Problem
Lucia Angel, Giorgio Arcadi, Matheus M. A. Paixão +1
Late-decaying particles naturally arise in many extensions of the Standard Model, directly impacting key cosmological processes in the early universe, such as Big Bang Nucleosynthe…
hep-ph2024
The Hubble Tension: Relativistic Dark Matter Production from Long-lived Particles
Alvaro S. de Jesus, Matheus M. A. Paixão, Dêivid R. da Silva +2
The tension between direct measurements of the Hubble constant and those stemming from Cosmic Microwave Background probes has triggered a multitude of studies. The connection betwe…