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Gabriel Gomez (Universidad Mayor)20/05/2026, 09:00
The stochastic gravitational-wave background (SGWB) provides a powerful probe of fundamental physics across a broad frequency range, accessible to ground-based interferometers such as the LIGO–Virgo Collaboration and pulsar timing arrays like NANOGrav. In this talk, I explore how SGWB observations can test extensions of the standard cosmological model involving dark vector fields.
After a...
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Lina Castiblanco (Newcastle University)20/05/2026, 10:45
Next-generation galaxy surveys will provide vast datasets that can significantly improve our understanding of the Universe, provided that we fully exploit their cosmological information content. However, the late-time matter distribution is intrinsically non-Gaussian, limiting the information captured by standard two-point statistics. To recover this information, it is essential to incorporate...
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Damianos Iosifidis (Scuola Superiore Meridionale (SSM), Napoli)20/05/2026, 14:00
I will discuss how the inclusion of a fluid's microstructure, namely the spin, dilation and shear parts of hypermomentum influence the Cosmological dynamics. In particular, imposing isotropy and homogeneity, I will introduce the concept of a Cosmological Hyperfluid; a generalization of the perfect fluid notion in Metric-Affine (Non-Riemannian) Geometries. Finally, I will discuss some...
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Elena Giusarma (Michigan Technological University)21/05/2026, 09:00
The current era of precision cosmology has established the ΛCDM model as a remarkably successful framework for describing observations ranging from the Cosmic Microwave Background to the large-scale structure of the Universe. At the same time, persistent tensions among cosmological probes and unresolved questions, including the nature of dark energy, modified gravity scenarios, and the...
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Prof. Antonio De Felice (Yukawa Institute for Theoretical Physics, Kyoto University)21/05/2026, 10:45
Current cosmological observations have established the accelerated expansion of the Universe, yet the physical nature of dark energy remains elusive. We summarize the current status of cosmology as inferred from observational data and discuss the implications for the nature of dark energy. We review the main observational probes, highlight existing tensions between datasets within the standard...
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Jorge Noreña (Pontificia Universidad Catolica de Valparaiso)21/05/2026, 14:00
We study the effect of superhorizon scalar and tensor perturbations on local observers. We will show that constant perturbations and constant gradients don't have physical effects if they were sourced by single-field inflation (they are so-called adiabatic modes). The leading physical effect of superhorizon perturbations comes at second order in derivatives. At this order, they induce a small...
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Mauricio Reyes (Michigan Technological University)22/05/2026, 09:00
Next-generation surveys like DESI, Euclid, and LSST demand fast emulation of nonlinear structure across extended cosmological scenarios, but N-body simulations of modified gravity and massive neutrinos remain computationally prohibitive. I present a solution using denoising diffusion probabilistic models (DDPMs) trained directly on matter density fields from f(R) gravity...
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Dr Alexander Bonilla Rivera (Instituto de Física, Universidade Federal Fluminense)22/05/2026, 10:45
In this study, we investigate deviations from the Planck-$\Lambda$CDM model in the late universe ($z \lesssim 2.5$) using the Gaussian Processes method, with minimal assumptions. Our goal is to understand where exploring new physics in the late universe is most relevant. We analyze recent Cosmic Chronometers (CC), Type Ia Supernovae (SN), and Baryon Acoustic Oscillations (BAO) data. By...
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David Ricardo Moreno Diaz (Universidad Industrial de Santander)22/05/2026, 11:10
Dark matter bulk viscosity is frequently proposed as a unified phenomenological mechanism to drive the late-time accelerated expansion of the Universe without a cosmological constant. In this work, we employ a general, parameter-independent dynamical systems approach to rigorously assess the macroscopic viability of such dissipative models across the entire cosmic history. We establish a...
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Jhan Nicolás Martínez Lobo (Universidad Industrial de Santander)22/05/2026, 11:35
Our purpose is to give a step forward in the search of nature's options to describe classical gravity. Two reasonable hypotheses are invoked: the spacetime is described by a smooth manifold, which might or might not be Riemannian, and the classical gravitational dynamics is intimately related to the laws of thermodynamics (Jacobson's programme). We have found that the Einstein-Hilbert's action...
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Mr PEDRO MARTIN IBARBO PERLAZA (Universidad del Valle)22/05/2026, 12:00
We investigate the cosmological implications of Tsallis entropy in two widely discussed frameworks: the Cai–Kim thermodynamic derivation of the Friedmann equations and the Tsallis holographic dark energy (HDE) scenario, considering both the Hubble scale and the Granda–Oliveros (GO) cutoff as infrared regulators. In both cases, the dynamics introduce a nonextensivity parameter $\delta$, with...
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