4 papers
Curvature-induced phantom behavior and cosmological bounces without violating the Dominant Energy Condition
Miguel Cruz, Samuel Lepe
We show that a spatially closed universe can exhibit effective phantom dynamics () and reach a finite-time cosmological event without violating the Dominant Energy Condition…
Torsional pseudo-inflation beyond Einstein-Cartan
Fernando Izaurieta, Samuel Lepe, Cristian Quinzacara
Torsion entered early-universe cosmology twice: through the nonsingular Einstein--Cartan bounce, where the quantum spin of fermions halts the contraction, and through the proposal…
No late-time role for adiabatic torsion: a no-go result for Hubble-cutoff holographic dark energy in Einstein--Cartan cosmology
Fernando Izaurieta, Samuel Lepe, Cristian Quinzacara
In Friedmann cosmology with Einstein--Cartan torsion, the homogeneous torsion mode compatible with a separately conserved matter sector scales as and enters the F…
Gravitational Faraday Effect induced by Dark Matter Spin
F. Barriga, F. Izaurieta, S. Lepe +4
We show that the spin of dark matter induces a gravitational analog of the electromagnetic Faraday effect, where the polarization of gravitational waves undergoes a rotation as the…