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Florian Kühnel20/05/2025, 09:20
In the first part of my talk, I will discuss how recent advances in our understanding of quantum effects in black holes impact PBHs. On the one hand, this concerns deviations from Hawking radiation in the form of the memory-burden effect. On the other hand, I will discuss vorticity, which we recently conjectured to be a new characteristic of (near-extremally rotating) black holes. In the...
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Mr Nayan Das (Indian Institute of Technology Guwahati)20/05/2025, 09:40
We discuss the possibility of producing the observed baryon asymmetry of the Universe (BAU) and dark matter (DM) from evaporating primordial black holes (PBH) incorporating semi-classical and memory burden regime. In the simplest scenario of baryogenesis via vanilla leptogenesis with hierarchical right handed neutrino (RHN), it is possible to generate the observed BAU with PBH being sole...
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Andrea Boccia (Scuola Superiore Meridionale)20/05/2025, 10:00
In this talk I will address how “memory-burdened” primordial black holes (PBHs) of low mass, evaporating today, could in principle be detected via their neutrino emission.
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Using the latest IceCube data, we place novel constraints on the combined parameter space of PBH masses and memory burden effects. Additionally, we explore whether the ultra-high-energy neutrino event recently detected by... -
Sebastian Zell (LMU Munich)20/05/2025, 10:20
Mounting theoretical evidence suggests that the information stored in black holes suppresses their decay rate. This effect of memory burden opens up a new window for small primordial black holes (PBHs) below $10^{15}\,{\rm g}$ as dark matter candidates. In this talk, I show that the smooth transition from semi-classical evaporation to the memory-burdened phase strongly impacts observational...
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Marco Chianese (Scuola Superiore Meridionale)20/05/2025, 11:10
We explore the impact of the back-reaction of evaporation on the quantum state of Primordial Black Holes (PBHs), known as “memory burden”, on the baryon asymmetry production in the Universe through high-scale leptogenesis. Focusing on PBH masses ranging from 1 to 1000 grams, we investigate the interplay between the non-thermal production of heavy sterile neutrinos and the entropy injection...
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Dr Marco Calza (University of Trento)20/05/2025, 11:30
We introduce and describe $\tt GrayHawk$, a publicly available Mathematica-based tool designed for the efficient computation of gray-body factors for spherically symmetric and asymptotically flat black holes. This program provides users with a rapid and reliable means to compute gray-body factors for massless fields with spin (s = 0, 1/2, 1, 2) in modes specified by the angular quantum...
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Lucien Heurtier (King's College London)20/05/2025, 11:50
In this talk, I will give a general overview of how the thermal plasma behaves around evaporating, light, primordial black holes, and the effect this evolution can have on the Hawking radiation emitted by such black holes. In particular, I will present several particle physics frameworks in which the presence of a temperature gradient around evaporating black holes can have important...
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Clelia Altomonte (King's College London)20/05/2025, 12:10
Upon their evaporation via Hawking radiation, primordial black holes (PBHs) may deposit energy in the ambient plasma on scales smaller than the typical distance between two black holes, leading to the formation of hot spots around them.
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In this talk (based on the recent work https://arxiv.org/pdf/2501.05531), I will consider how the corresponding rise of the local temperature during the... -
Satyabrata Datta (Nanjing Normal University)
Blue-tilted Gravitational Waves (BGWs) have emerged as a promising candidate for explaining the cosmic gravitational wave signals observed by Pulsar Timing Arrays (PTA). Within the standard cosmological model, the frequency range of BGWs is restricted by the Big Bang Nucleosynthesis (BBN) limit on gravitational wave amplitude, which prevents their detection at interferometer scales. However,...
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Federico De Lillo (Universiteit Antwerpen)
Primordial black holes (PBHs) are possible sources of a gravitational-wave background (GWB), detectable with LISA and the next observing runs of LIGO--Virgo--KAGRA. In case of a detection, it will be crucial to distinguish the possible sources of this GWB. One possibility is to exploit the duty cycle that quantifies the number of sources present in the time domain signal, which can be very...
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