49 citations · 238 across the 13 of their papers we have counts for
14 papers
The interacting multiverse and its effect on the cosmic microwave background
Mariam Bouhmadi-López, Manuel Kraemer, João Morais +1
We study a toy model of a multiverse consisting of canonically quantized universes that interact with each other on a quantum level based on a field-theoretical formulation of the…
Pre-inflation from the multiverse: Can it solve the quadrupole problem in the cosmic microwave background?
João Morais, Mariam Bouhmadi-López, Manuel Kraemer +1
We analyze a quantized toy model of a universe undergoing eternal inflation using a quantum-field-theoretical formulation of the Wheeler-DeWitt equation. This so-called third quant…
What if? - Exploring the Multiverse through Euclidean wormholes
Mariam Bouhmadi-López, Manuel Kraemer, João Morais +1
We present Euclidean wormhole solutions describing possible bridges within the multiverse. The study is carried out in the framework of the third quantization. The matter content i…
What if gravity becomes really repulsive in the future?
Imanol Albarran, Mariam Bouhmadi-López, João Morais
The current acceleration of the Universe is one of the most puzzling issues in theoretical physics nowadays. We are far from giving an answer on this letter to its true nature. Yet…
Cosmic infinity: A dynamical system approach
Mariam Bouhmadi-López, João Marto, João Morais +1
Dynamical system techniques are extremely useful to study cosmology. It turns out that in most of the cases, we deal with finite isolated fixed points corresponding to a given cosm…
Cosmological perturbations in an effective and genuinely phantom dark energy Universe
Imanol Albarran, Mariam Bouhmadi-López, João Morais
We carry out an analysis of the cosmological perturbations in general relativity for three different models which are good candidates to describe the current acceleration of the Un…
Interacting 3-form dark energy models: distinguishing interactions and avoiding the Little Sibling of the Big Rip
João Morais, Mariam Bouhmadi-López, K. Sravan Kumar +2
In this paper we consider 3-form dark energy (DE) models with interactions in the dark sector. We aim to distinguish the phenomenological interactions that are defined through the…
-essence model from the mechanical approach point of view: coupled scalar field and the late cosmic acceleration
Mariam Bouhmadi-López, K. Sravan Kumar, João Marto +2
In this paper, we consider the Universe at the late stage of its evolution and deep inside the cell of uniformity. At these scales, we can consider the Universe to be filled with d…
The late Universe with non-linear interaction in the dark sector: the coincidence problem
Mariam Bouhmadi-López, João Morais, Alexander Zhuk
We study the Universe at the late stage of its evolution and deep inside the cell of uniformity. At such a scale the Universe is highly inhomogeneous and filled with discretely dis…
Coupled scalar fields in the late Universe: The mechanical approach and the late cosmic acceleration
Alvina Burgazli, Alexander Zhuk, João Morais +2
In this paper, we consider the Universe at the late stage of its evolution and deep inside the cell of uniformity. At these scales, we consider the Universe to be filled with dust-…
Can f(R) gravity contribute to (dark) radiation?
Joao Morais, Mariam Bouhmadi-Lopez, Salvatore Capozziello
We discuss the possibility that suitable modifications of gravity could account for some amount of the radiation we observe today, in addition to the possibility of explaining the…
The energy spectrum of gravitational waves in a loop quantum cosmological model
Joao Morais, Mariam Bouhmadi-Lopez, Alfredo B. Henriques
We explore the consequences of loop quantum cosmology (inverse-volume corrections) in the spectrum of the gravitational waves using the method of the Bogoliubov coefficients. These…
The spectrum of gravitational waves in an f(R) model with a bounce
Mariam Bouhmadi-Lopez, Joao Morais, Alfredo B. Henriques
We present an inflationary model preceded by a bounce in a metric theory. In this model, modified gravity affects only the early stages of the universe. We analyse the predi…
Smoking guns of a bounce in modified theories of gravity through the spectrum of the gravitational waves
Mariam Bouhmadi-Lopez, Joao Morais, Alfredo B. Henriques
We present an inflationary model preceded by a bounce in a metric theory a lá where is the scalar curvature of the space-time. The model is asymptotically de Sitter such…