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Anna Chiara Ferri (Sapienza University of Rome)19/11/2025 13:30
Recent cosmological analyses combining Planck CMB data with baryon acoustic oscillation (BAO) measurements from the DESI collaboration have revealed a statistically significant preference for evolving dark energy (DE) models over the standard cosmological constant. In particular, fits using the Chevallier–Polarski–Linder (CPL) parameterization indicate a $\sim\!4\sigma$ deviation from a...
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Amaury Micheli (RIKEN iTHEMS)19/11/2025 13:45
The statistical properties of the CMB anisotropies, reflecting the curvature inhomogeneities in the early Universe, are very well accounted for by assuming that they emerged from amplified vacuum fluctuations.
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Being the result of a genuine quantum process, it is natural to wonder which properties of these primordial inhomogeneities are quantum, and which, if any, persisted until their... -
Takuro Fujino (High energy accelerator research organization)19/11/2025 14:00
Although the cosmic microwave background (CMB) is assumed to be only linearly polarized due to the Thomson scattering, some exotic theories predict the generation of circular polarization in the CMB during its propagation. E.g., Faraday conversion due to the supernovae remnants of first stars[1], the scattering by cosmic neutrino background[2], and Lorentz violation[3]. Thus, the circular...
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Sandip Biswas (Indian Institute of Technology Kanpur)19/11/2025 14:15
Testing the limits of the inflationary paradigm can be achieved by moving beyond the standard slow-roll conditions. One approach is to constrain the dynamics of the inflaton field with a constant rate of roll, known as the constant-roll scenario, where the acceleration of the inflaton field satisfies $\ddot{\phi} \propto H \dot{\phi}$. This scenario has been studied extensively in the context...
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Baptiste Jost (IPMU)19/11/2025 14:30
The Simons Observatory (SO) is a new generation CMB experiment located in the Atacama Desert and is currently taking data. One of the main scientific goals of the SO Small Aperture Telescopes (SATs) is to measure traces of inflation in the primordial B-modes in the CMB polarization, whose amplitude is parameterized by r.
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This signal would be extremely faint, and its detection depends on... -
Simone D'Onofrio (ICE-CSIC)19/11/2025 14:45
The thermodynamics of black holes inspired the concept of black hole entropy, linking gravity and thermodynamics. When applied to cosmology, this leads to the standard Friedmann equations, which face challenges in explaining the universe’s evolution. Modified entropies have been proposed to resolve these issues. A recently introduced four-parameter generalized entropy unifies several known...
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MATTEO PERONACI19/11/2025 15:00
The quest to understand the cosmos has led to the remarkable discovery that the universe is expanding at an accelerating rate. This revelation necessitated the integration of dark energy into the standard cosmological model, known as ΛCDM. While ΛCDM model has achieved remarkable success in explaining various observations, it still faces challenges and uncertainties related to dark energy and...
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ELISA FAZZARI (Sapienza University of Rome)19/11/2025 15:15
In this work we introduce a high-redshift cosmographic framework based on a new Padé expansion, providing improved accuracy at $z \gtrsim 1$. We estimate the cosmographic parameters $ H(z), \,q(z),\, j(z),\,s(z) $ at different fixed redhsift values by combining DESI BAO data (calibrated with Planck’s sound horizon scale $r_d$), the Pantheon Plus and DESy5 Type Ia supernova samples, and...
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Prof. Josquin Errard (APC)19/11/2025 16:00
FURAX is a python framework created to utilize the functionality of JAX in modern cosmological
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analysis with its ever increasing complexity and resource requirements. In particular, the ability
to run on GPU clusters, hardware acceleration, Just-In-Time compilation, and automatic differen-
tiation. This framework has already found its application in MEGATOP, a component-separation
pipeline... -
Abhijeet Singh (Indian Institute of Science)19/11/2025 16:15
The James Webb Space Telescope (JWST) has opened up new vistas to the very distant universe hitherto inaccessible. We make use of the UV Luminosity Functions deduced from JWST high-redshift observations to put constraints on the cross section of dark matter interacting with radiation. We find that though we only have little data from JWST as of now, the constraints are already competitive with...
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Ranjini Mondol19/11/2025 16:30
James Webb Space Telescope (JWST) has revealed a surprisingly high number of UV-bright galaxies at $z \geq 10$. The UV luminosity function at these high redshifts is an excellent probe for studying structure formation on small scales and at high redshifts. Dark matter (DM) and baryon interactions have been tested through direct detection experiments, as well as astrophysical and cosmological...
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Radek Stompor (CNRS, AstroParticule et Cosmologie)19/11/2025 16:45
I will discuss current and future observational probes which could bring new clues about the first moments of the Universe and the physics at the extreme energies, emphasizing their uniqueness and complementarity. The first part of the talk will cover the still-unexplored scientific potential of the cosmic microwave background polarized anisotropy observations. I will discuss the prospects...
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M. Kiyoshi Ikuma (Okayama University)19/11/2025 17:00
The B-mode polarization of the cosmic microwave background (CMB) is a sensitive probe of primordial gravitational waves. A precise measurement of the tensor-to-scalar ratio $r$ enables stringent tests of inflation, yet the B-mode signal is hidden beneath Galactic foregrounds. Delta-map approximates the line-of-sight dependence of the foreground spectral energy distribution to first order,...
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Bhaskar arya (IIT Kanpur)19/11/2025 17:15
We present a machine learning framework that uses neural networks to predict Lyman-$\alpha$ forest spectra from dark matter density fields. Trained on simulations with varying cosmological parameters, our network learns the complex, non-linear transformation from the underlying matter distribution and velocity fields to transmitted flux. We demonstrate that the network accurately reconstructs...
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Dr Le TD (Dong Nai Technology University)19/11/2025 17:30
We investigate potential variations in fundamental constants—such as the fine-structure constant (α), the proton-to-electron mass ratio (μ), and Newton’s gravitational constant (G)—as a probe of physics beyond the Standard Model. Using high-resolution ultraviolet spectra of Fe V in the white dwarf G191-B2B from HST/STIS, combined with precise laboratory data, we constrain the time variation of...
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Prof. Graziano Rossi (Sejong University)19/11/2025 17:45
Determining the absolute mass of neutrinos remains a major challenge in cosmology and particle physics. Recent DESI DR1/DR2 results suggest potential deviations from the standard ΛCDM model and indicate that conventional two-point statistics may be insufficient to robustly detect Mν – sparking controversial hints of a negative neutrino mass. To overcome these limitations, we introduce robust,...
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Artem BASYROV (APC, CNRS)
FURAX is a python framework created to utilize the functionality of JAX in modern cosmological analysis with its ever increasing complexity and resource requirements. In particular, the ability to run on GPU clusters, hardware acceleration, Just-In-Time compilation, and automatic differentiation. This framework has already found its application in MEGATOP, a component-separation pipeline for...
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Rajeev Kumar Jain (Indian Institute of Science, Bangalore, India)
Primordial black holes (PBH) have recently emerged as a very interesting candidate for the cold dark matter in the universe. We study their generation in a single field inflationary model with an inflection point potential and found that PBHs can be produced in our scenario in the asteroid-mass window with a nearly monochromatic mass fraction, accounting for the total dark matter in the...
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