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24. The AIDA-TNG project: new insights on alternative dark matter in simulations of galaxy formationGiulia Despali (University of Bologna)15/06/2026, 16:30Oral contribution
One of the foundations of the concordance cosmological model is that approximately 85 per cent of the matter content of the Universe is in the form of some yet unknown component that we can detect only through its gravitational effect: dark matter. While the standard Cold Dark Matter model is very successful at explaining the large scale structure distribution of the universe, it has been...
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Federico Lelli (INAF - Arcetri Astrophysical Observatory)15/06/2026, 16:50Oral contribution
Milgromian dynamics (or Modified Newtonian Dynamics, MOND) is a major alternative to particle dark matter proposed in 1983 by Mordehai Milgrom. MOND modifies the non-relativistic laws of gravity and/or inertia at low accelerations, below a characteristic acceleration scale a0. In this proposed contribution, I will showcase the content of the first "MOND white paper", which results from the...
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Davide Tornotti15/06/2026, 17:10Oral contribution
The existence of filaments connecting galaxies, within which galaxies form, has been a long-standing prediction of structure formation theories in a Universe dominated by cold dark matter. However, direct imaging of these filaments has remained elusive until the advent of large-format integral field spectrographs such as the Multi Unit Spectroscopic Explorer (MUSE) at the Very Large...
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Giada Quadri (University of Milano-Bicocca)15/06/2026, 17:30Oral contribution
Understanding galaxy formation and evolution within the ΛCDM framework remains one of the critical challenges in astrophysics. Recent JWST observations revealed the existance of a massive giant disc within a Cosmic Web node at z~3, namely the Big Wheel. Constraining its origin requires a detailed characterisation of its dark matter halo, whose properties are notoriously difficult to extract...
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Gabriele Coppi16/06/2026, 11:30Invited talk
We present the strategy and hardware development for the POLOCALC drone-deployed calibration system for Cosmic Microwave Background. Achieving the unprecedented precision required for next generation CMB experiments, whose goal is the measurement of the inflationary signal due to the primordial gravitational waves. We have developed and deployed artificial sources capable of emitting in...
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Noemi Mezzanzanica16/06/2026, 11:50Oral contribution
Accurate polarization angle calibration of Cosmic Microwave Background (CMB) telescopes constitutes a critical challenge in modern observational cosmology. A miscalibration of the polarization angle induces spurious leakage from E-modes into B-modes, which contaminates the primordial gravitational wave signal, biases the reconstruction of the CMB lensing potential, and introduces systematic...
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Idil Ezgi Karaaslan (University of Milano-Bicocca)16/06/2026, 12:10Oral contribution
In this talk, I will give an overview of the cosmic birefringence effect, from its theoretical foundations to its imprint on the polarized Cosmic Microwave Background. Cosmic birefringence, the rotation of the linear polarization plane of photons as they travel across the universe, would be a direct manifestation of parity violation in the Universe. It arises naturally when a pseudoscalar...
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Lorenzo Pizzuti (Dipartimento di Fisica G. Occhialini, Università Milano Bicocca)16/06/2026, 14:00Oral contribution
Galaxy clusters are excellent natural laboratories to study the nature of gravity and test possible alternative to the Concordance Model, at the edge between cosmology and astrophysics. I present recent results obtained by using the updated version of MG-MAMPOSSt, a code that reconstructs the mass distribution of clusters with kinematics and lensing analyses in modified gravity/Dark Energy...
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Giovanni Ferron (Università di Milano Bicocca)16/06/2026, 14:20Oral contribution
In this work I aim to characterize the interplay between self-interacting dark matter (SIDM) models with velocity-dependent cross-section and the baryonic component inside galaxy clusters, investigating their combined effects on 3D and projected halo profile shapes and their deviation from collisionless dark matter (CDM) predictions. To this end, I investigate the DIANOGA-SIDM simulations of...
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Valeria Broccolato (Università degli Studi di Torino)16/06/2026, 14:40Oral contribution
While Modified Newtonian Dynamics (MOND) successfully accounts for the observed dynamics of individual galaxies without invoking dark matter, galaxy clusters still require additional mass beyond the observed baryonic buget even in this framework.
I will present recent results on five galaxy clusters from the XCOP survey (A1795, A2029, A2142, A644, A2319) using X-ray data under the...
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Marriam Naeem16/06/2026, 15:00Oral contribution
We investigate whether a minimal effective pressure in the dark matter sector can generate observable deviations from standard cold dark matter ($\Lambda$CDM) predictions at nonlinear scales. We model dark matter as a polytropic fluid with equation of state $P = K \rho^{3/2}$, interpreted as an effective coarse-grained closure of the collisionless Jeans hierarchy in virialized halos.
For...
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Dr Will Barker (Central European Institute for Cosmology and Fundamental Physics, Institute of Physics of the Czech Academy of Sciences)16/06/2026, 15:20Oral contribution
Particle dark matter, along with many ultraviolet scenarios, suggest that additional low-energy degrees of freedom remain to be discovered. Theories of new physics may be understood as statistical models, for which the Lagrangian couplings are model parameters. The net worth of a theory is determined by its Bayesian evidence: the likelihood of precision cosmology data is multiplied by the...
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Mr DEBADRI BHATTACHARJEE (COOCH BEHAR PANCHANAN BARMA UNIVERSITY)16/06/2026, 15:40Oral contribution
This work explores a novel singularity-free relativistic solution to the Einstein field equations, focusing on dark energy stars within the framework of Rastall gravity. The Low-Mass X-ray Binary (LMXB) 4U 1608-52, characterized by a mass of 1.74 $M_{\odot}$ and a radius of 9.3 Km (T. G\"uver et al., Astrophys. J. {\bf 712}, 964 (2010)), is considered as a potential candidate for dark energy...
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Andrea Trost16/06/2026, 16:30Oral contribution
The ultralight dark photon is a well-motivated, hypothetical dark matter candidate. In a dilute plasma, they can resonantly convert into photons and heat up the intergalactic medium between galaxies. In this talk, we explore the dark photon dark matter parameter space by comparing synthetic Lyman-α forest data from cosmological hydrodynamical simulations to observational data from VLT/UVES of...
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Titouan Lazeyras (University of Milano-Bicocca)16/06/2026, 16:50Oral contribution
While the existence of dark matter is well established, its precise properties remain a pivotal question of modern cosmology. In this talk, I will present a new probe to constrain dark matter properties: fluorescent emission from the intergalactic medium around UV-bright quasars in the young universe (z~3). The gas in the intergalactic medium is an optimal tracer of the underlying dark matter,...
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Enrico Maraboli (Università degli Studi di Milano)16/06/2026, 17:10Oral contribution
Galaxy clusters are privileged astrophysical laboratories, tracing the most massive dark matter haloes in the Universe and allowing for accurate studies about their gravitational potential. The high masses (>10^14 Msun) of galaxy clusters make them ideal objects to probe new gravity models through gravitational redshift (GRS), which is recently established among the most important probes to...
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Michele Fulghieri16/06/2026, 17:30Oral contribution
The high-resolution study of the large-scale structures (LSS) of the universe is one of the most intriguing frontiers in computational astrophysics and represents a crucial tool to support recent advancements in observations, especially in emission. In this context, we present the currently ongoing project of implementing cosmology on QUOKKA, a state-
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