3 papers
astro-ph.CO2025
Fréchet Vectors as sensitive tools for blind tests of CMB anomalies
Ricardo G. Rodrigues, Thiago S. Pereira, Miguel Quartin
Cosmological data collected on a sphere, such as CMB anisotropies, are typically represented by the spherical harmonic coefficients, denoted as . The angular power spec…
gr-qc2025
Spatial anisotropies from long wavelength scalar and tensor modes
Jorge Noreña, Thiago S. Pereira, Sean K. Reynolds
We investigate the dominant physical effects of superhorizon fluctuations in a flat FLRW universe, focusing on whether the combined evolution of scalar and tensor adiabatic modes i…
astro-ph.CO2024
Multifield curved solid: Early dark energy and perturbation instabilities
Juan P. Beltrán Almeida, Alejandro Guarnizo, Thiago S. Pereira +1
We introduce a multifield dark energy model with a nonflat field-space metric, in which one field is dynamical while the others have constant spatial gradients. The model is predic…