Gravitoelectromagnetism (GEM) is an approach based on describing gravity in an analogous way to electromagnetism. Vector and tensor formalisms for GEM have been developed in the last years. We will review them by presenting their theoretical background, experimental motivation, and some applications. Recently, this approach has received relevant attention due in part to its analogy to the...
We use Minkowski Functionals (MF) to explore the possible presence of
non-Gaussian signatures in the recently released cosmic microwave background
(CMB) Planck maps. In particular, we investigate MF outcomes for two sets of
simulated CMB maps: one seeded by the $\Lambda$CDM concordance model, another
seeded by the 'best-fit' CMB angular power spectrum. By 'best-fit' we mean
a simulated...
We present a detailed analysis of the thermodynamics of exact asymptotically
flat hairy black holes in Einstein-Maxwell-dilaton theory. We compute the regularized
action, quasilocal stress tensor, and conserved charges by using a ‘counterterm method’
similar to the one extensively used in the AdS-CFT duality. In the presence of a non-trivial
dilaton potential that vanishes at the boundary we...
In this work, we make the first step to derive non-radial pulsation equations in extra dimensions and investigate how the $f$- and $p_1$-mode frequencies of strange quark stars, within the Cowling approximation, change with the number of dimensions. In this regard, the study is performed by solving numerically the non-radial pulsation equations, adjusted for a $d$-dimensional space-time...
We can obtain the cosmic growth rate of structures, $f(z)$, when we compare the gravitational acceleration of a galaxy distribution in the local group with its peculiar velocity measured using the earth relative motion with respect to the Cosmic Background Radiation. The quantity $f(z)$, expected to be $f(z) \approx \Omega_{m}(z)^{\gamma}$ in the $\Lambda$CDM model, can distinguish...
We investigate a possible inflationary scenario where the expantion is driven by a slow evolution homogeneous single scalar field, whose potential V(φ) is given by a generalized exponential function taken from the κ-deformed theories. Within the slow-roll approximation, we obtained some the main predictions of the model, as scalar spectral index (ns), tensor to scalar ratio (r), number...
Understanding distributions of black holes is crucial to both astrophysics and quantum gravity. Studying astrophysical population statistics has even been suggested as a channel to constrain black hole formation from the quantum vacuum. Here we propose a Gedankenexperiment to show that the non-linear properties of binary mergers (simulated with accurate surrogate models) generate an attractor...
We perform a Bayesian model selection analysis for interacting scenarios of dark matter and modified holographic Ricci dark energy (MHRDE) with linear interacting terms.We use a combination of some of the latest cosmological data such as type Ia supernovae, cosmic chronometers, cosmic microwave background and baryon acoustic oscillations measurements. We find strong evidence against all the...
En base a todas las observaciones y estudios por los astrofísicos, sabemos que los Núcleos Galácticos Activos o AGNs son los objetos más luminosos del universo que emiten radiación en casi todo el espectro electromagnético. Estos objetos presentan una estructura muy compleja por lo que estudiar cada una de sus componentes es un gran desafío y de gran aporte para la astrofísica...
The regularized four-dimensional Einstein-Gauss-Bonnet model has been recently proposed in [D. Glavan and C. Lin, Phys. Rev. Lett. \textbf{124}, 081301 (2020)] whose formulation is different of the Einstein theory, allowing us to bypass the Lovelock theorem. The action is formulated in higher dimensions ($D>4$) by adding the Gauss-Bonnet correction to the conventional Einstein-Hilbert action...
Modifications of the non-linear Schr\"odinger model (MNLS) $ i \partial_{t} \psi(x,t) + \partial^2_{x} \psi(x,t) - [\frac{\delta V}{\delta |\psi|^2} ] \psi(x,t) = 0,$ where $\psi \in C$ and $V: R_{+} \rightarrow R$, are considered. We show that the quasi-integrable MNLS models possess infinite towers of quasi-conservation laws for soliton-type configurations with a special complex conjugation,...
