Conveners
Cosmology / Astroparticles
- Alex Tapia (University of Medellin)
- Nicolás Bernal (Universidad Antonio Nariño)
- Oscar Alberto ZAPATA NOREÑA
Presentation materials
To date, different alternative theories of gravity involving Proca and SU(2) Proca fields have been proposed. Unfortunately, the procedure to obtain the relevant terms has not been systematic enough or exhaustive, thus resulting in some missing terms or ambiguity in the process carried out. In this talk, we will show a systematic procedure to build the generalized Proca and SU(2) Proca field...
In the context of the dark energy scenario, the Einstein Yang-Mills Higgs model in the SO(3) representation was studied for the first time by M. Rinaldi (see JCAP 1510, 023 (2015)) in a homogeneous and isotropic spacetime. We revisit this model, finding in particular that the interaction between the Higgs field and the gauge fields generates contributions to the momentum density,...
In this work, we study a triplet of inhomogeneous scalar fields, known as “solid”, as a source of anisotropic dark energy. By using a dynamical system approach, we find that anisotropic accelerated solutions can be realized as attractor points for suitable parameters of the model. We compliment the dynamical analysis with a numerical solution whose initial conditions are set in the deep...
The large scale structure bispectrum contains information about the dynamics of the early universe in the squeezed limit since it couples large scales and short scales. Therefore, we compute the dark matter and galaxy bispectrum in a framework that is non-linear and based on General Relativity. To start, we use the weak-field approximation and standard perturbation theory to find the fluid...
The current experimentally measured parameters of the Standard Model (SM) suggest that our universe lies in a metastable electroweak vacuum, where the Higgs field could decay to a lower vacuum state with catastrophic consequences. Our measurements dictate that such an event has not happened yet, despite the many different mechanisms that could have triggered it during our past light-cone. Via...
Presentamos una metodología que permite obtener perfiles atmosféricos mensuales para el estudio del flujo de astropartículas a nivel del suelo, usando el Sistema Global de Asimilación de Datos GDAS. Estos perfiles pueden ser creados para para cualquier ubicación geográfica, y su implementación permitió cuantificar los efectos de las variaciones de densidad, en el flujo de...
Muography is a technique that allows us to estimate the distribution of matter in the inner structure of geophysical formations like volcanoes. This technique is based on the measurement of the absorption of atmospheric muons that go through the structure, so that with a hodoscope instrument it is possible to build a map of density of matter, similar to a medical X-ray image. The MuTe...
Exposure to ionizing radiation during commercial flights has repercussions on human health, in particular for flights pass through the South Atlantic Geomagnetic Anomaly (SAA). This radiation is originated from the interaction of cosmic rays (CR) with Earth's atmosphere. Likewise, the flux of CR with energies around GeV is affected by the Geomagnetic field, this establishes a dependence...
We discuss in this talk several physical principles as well as emerging observational constraints, as the speed of gravitational waves, that any dark energy model has to face in order to ensure its cosmological viability. In particular dark energy models based on modified gravity theories find a major challenge for addressing the late-time dynamics in a consistent way due to the presence of...
