32 citations · 88 across the 7 of their papers we have counts for
7 papers
Probing the statistical isotropy of the universe with Planck data of the cosmic microwave background
C. E. Kester, A. Bernui, W. S. Hipólito-Ricaldi
We study the angular distribution of temperature fluctuations in the cosmic microwave background (CMB) to probe the statistical isotropy of the universe by using precise full-sky C…
Cosmography from well-localized Fast Radio Bursts
Jéferson A. S. Fortunato, Wiliam S. Hipólito-Ricaldi, Marcelo V. dos Santos
Fast Radio Bursts (FRBs) are millisecond-duration pulses occurring at cosmological distances that have emerged as prominent cosmological probes due to their dispersion measure (DM)…
Particle Production in Ekpyrotic Scenarios
W. S. Hipolito-Ricaldi, Robert Brandenberger, Elisa G. M. Ferreira +1
We consider Parker particle production in the Ekpyrotic scenario (in particular in the New Ekpyrotic model) and show that the density of particles produced by the end of the phase…
A Jacobian generalization of the pseudo Nambu-Goldstone bosons potential
W. S. Hipólito-Ricaldi, J. R. Villanueva
We enlarge the classes of inflaton and quintessence fields by generalizing the pseudo Nambu--Goldstone boson potential by means of elliptic Jacobian functions, which are characteri…
Interacting dark energy and transient accelerated expansion
W. Zimdahl, C. Z. Vargas, W. S. Hipólito-Ricaldi
We argue that interactions in the dark sector may have a crucial impact on the cosmological dynamics. In particular, the future cosmic evolution may be very different from that pre…
Perturbations for transient acceleration
Cristofher Zuñiga Vargas, Wiliam S. Hipólito-Ricaldi, Winfried Zimdahl
According to the standard CDM model, the accelerated expansion of the Universe will go on forever. Motivated by recent observational results, we explore the possibility of a fin…
Non-adiabatic perturbations in decaying vacuum cosmology
W. Zimdahl, H. A. Borges, S. Carneiro +2
We investigate a spatially flat Friedmann-Lemaître-Robertson-Walker cosmology in which a decaying vacuum term causes matter production at late times. Assuming a decay proportional…