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Thomas Hambye (ULB)05/05/2023, 14:30
Dark Matter particles in the Galactic Center and halo can annihilate or decay into a pair of neutrinos producing a monochromatic flux of neutrinos. The spectral feature of this signal is unique and it is not expected from any astrophysical production mechanism. Its observation would constitute a dark matter smoking gun signal. We performed the first dedicated search with a neutrino telescope...
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Pedro De la Torre Luque05/05/2023, 14:50
The creation of anti-nuclei in the Galaxy has been has been discussed as a possible signal of exotic production mechanisms such as primordial black hole evaporation or dark matter decay/annihilation, in addition to the conventional production from cosmic-ray (CR) interactions. Tentative observations of CR antihelium by the AMS-02 collaboration have re-energized the quest to use antinuclei to...
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Alessandro Greco05/05/2023, 15:10
Cosmic birefringence is the in-vacuo rotation of the linear polarization plane experienced by photons of the Cosmic Microwave Background (CMB) radiation when theoretically well-motivated parity-violating extensions of Maxwell electromagnetism are considered. If the angle parametrizing such a rotation is dependent on the photon's direction, then this phenomenon is called Anisotropic Cosmic...
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Matteo Lucca (ULB)05/05/2023, 15:30
Whether primordial black holes (PBHs) can be the totality of the dark matter has always been a contentious issue. On the one hand they represent one of the best motivated candidates to make up for this dark component, but on the other hand a plethora of constraints significantly limit their abundance over a very wide mass range. Some of the most stringent examples come from cosmological and...
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Dr Felix Mirabel (CEA-France & IAFE-Argentina)05/05/2023, 15:50
I will review the evidences in the local universe for star formation caused by jets from accreting black holes (BHs). These BH “positive feedbacks” take place by the interaction of BH-jets with high-density molecular clouds (Dasyra et al. 2022). Because the global gas density in the universe evolves with redshift z as (1+z)^3, it is expected that this star formation mechanism is very important...
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Bruno Bucciotti (Scuola Normale Superiore di Pisa)05/05/2023, 16:40
We consider the phenomenological nightmare scenario where dark matter is only coupled gravitationally, thinking of black holes as probes. We choose to focus on wave dark matter because an oscillating massive scalar endows a black hole with hair, whose profile we study.
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We examine some assumptions implicit in the existing literature, and we do so by taking a fully analytic approach. We... -
Emily Kendall (The University of Auckland)05/05/2023, 17:00
‘Ultra-Light’ or ‘Fuzzy’ dark matter (ULDM) has been generating interest over recent years as a plausible alternative to weakly interacting CDM. Indeed, the lack of evidence for CDM candidates in direct-detection experiments motivates the exploration of novel dark matter models. Ultra-light scalar fields present a particularly attractive possibility due to their wave-like properties on...
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Alexis Boudon05/05/2023, 17:20
We present a comprehensive study of the dynamics of self-interacting scalar dark matter around a black hole, focusing on the dynamical friction and the impact of such a force on gravitational wave emission.
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Specifically, we explore the large scalar mass limit with quartic self-interactions in both subsonic and supersonic regimes. Our analysis reveals that the scalar field behaves as a perfect... -
Philipp Schicho (Goethe University Frankfurt)05/05/2023, 17:40
Beyond the Standard Model physics is required to explain both dark matter and the baryon asymmetry of the universe, the latter possibly generated during a strong first-order electroweak phase transition. While many proposed models tackle these problems independently, it is interesting to inquire whether the same model can explain both. We focus on a dark matter model featuring an inert...
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Raquel Galazo05/05/2023, 18:00
We study the formation and evolution of solitons supported by repulsive self-interactions inside extended halos, for scalar-field dark matter scenarios. We focus on the semiclassical regime where the quantum pressure is typically much smaller than the self-interactions. We present numerical simulations, with initial condtions where the halo is described by the WKB approximation for its...
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Asmaa Mazoun05/05/2023, 18:20
In this work we derive constraints on interacting dark matter-dark radiation models from a full-shape analysis of BOSS-DR12 galaxy clustering data, combined with Planck legacy cosmic microwave background (CMB) and baryon acoustic oscillation (BAO) measurements. We consider a set of models parameterized within the effective theory of structure formation (ETHOS), quantifying the lifting of the...
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