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Juan Garcia-Bellido21/05/2025, 14:00
I will review the formation of PBH clusters due to large exponential tails in the curvature perturbation distribution and study the strong non-linear dynamics of PBH in clusters, which produce PBH binaries that could have been detected via their GW emission in LVK.
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Antonio Junior Iovino (New York University Abu Dhabi)21/05/2025, 14:30
Primordial Black Holes (PBHs) are fascinating astrophysical objects that could provide valuable insights into the early universe, cosmology, and gravitational physics.
The standard formation scenario assumes that PBHs originate from the gravitational collapse of large curvature fluctuations generated during inflation. These same large scalar fluctuations, which can lead to PBH formation...
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Andrew Miller21/05/2025, 14:50
Gravitational waves from sub-solar mass inspiraling compact objects would provide almost smoking-gun evidence for primordial black holes (PBHs). We perform the first search for inspiraling planetary-mass compact objects in equal-mass and highly asymmetric mass-ratio binaries using data from the first half of the LIGO-Virgo-KAGRA third observing run. Though we do not find any significant...
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Andrea Ianniccari (University of Geneva)21/05/2025, 15:10
The physics of Primordial Black Holes has garnered significant interest in recent years, largely due to the numerous detections of gravitational
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waves originating from BH binary mergers and the hypothesis that some of
these may be of primordial origin.
We show that in realistic models where primordial black holes are formed due to the collapse of sizeable inflationary perturbations, their... -
Anjali Abirami Kugarajh (Gran Sasso Science Institute)21/05/2025, 16:00
The detection of gravitational waves (GWs) from binary black hole mergers has opened an exciting new avenue for cosmological research. Because GWs interact very weakly with matter, there is potential to observe primordial GWs among the signals captured by current and future detectors. This provides a unique opportunity to probe the early universe physics. Primordial GWs are typically generated...
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Benjamin Gladwyn (University of Oxford (GB))21/05/2025, 16:20
Mounting evidence suggests that the semi-classical description of a black hole breaks down at the latest after losing an~$O(1)$ fraction of its mass. As a result, effects such as memory burden can slow down evaporation so that small primordial black holes (PBHs), in particular those in the mass range~$10^{6}\, \text{g}$ to~$10^{9}\, \text{g}$, become viable dark matter candidates. I will...
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21/05/2025, 16:40
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Mrs Gabriele Franciolini22/05/2025, 09:00
Primordial black holes (PBHs) can form in the early universe and represent an intriguing dark matter candidate as well as a unique probe of the physics governing the early universe. Focusing on subsolar mass PBHs, we will discuss avenues to constrain their abundance with gravitational waves (GWs). These include i) direct searches for mergers using LIGO/Virgo/Kagra detectors; and ii) indirect...
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Ameek Malhotra22/05/2025, 09:30
The formation of primordial black holes (PBHs) from amplified density fluctuations in the early universe may also generate scalar-induced gravitational waves (GW), carrying vital information about the primordial power spectrum and the universe's expansion history. We present a Bayesian approach to reconstruct both the scalar power spectrum and the equation of state from GW observations, using...
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Simon Biot (ULB)22/05/2025, 09:50
The dynamics of early primordial black hole (PBH) binaries with an extended mass distribution are investigated. Specifically, we examine the perturbations and disruptions from the low-mass background population induced by such mass functions. Using dedicated Monte-Carlo simulations, new calculations of the so-called merger rate suppression factors are presented. Our results suggest that the...
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Frans van Die (Technion)22/05/2025, 10:10
The discovery of subsolar mass black holes would provide compelling evidence
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for the primordial origin of these objects. In this talk, I explore
how gravitational wave (GW) signals from a Galactic population of (sub)solar
mass primordial black hole (PBH) binaries could be identified by LISA (arXiv:
2410.04522). By modeling the formation and evolution of PBH binaries that
end up in the... -
Jan Tränkle (ITP Leibniz University Hanover)22/05/2025, 11:00
Although there is substantial observational evidence for an
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early period of exponential expansion of the Universe, known as
inflation, followed by a subsequent era of radiation domination, the
intermediate period connecting these two epochs, referred to as
reheating, remains challenging to constrain. In this talk, I will
present the primordial black hole (PBH) reheating scenario,... -
Ao Wang (Institute of Theoretical Physics，Chinese Academy of Sciences; Institute for Theoretical Physics, Leibniz University Hannover)22/05/2025, 11:20
Primordial black holes (PBHs) serve as a compelling candidate for dark matter and a potential probe of early universe physics. One promising avenue for constraining their abundance is through the stochastic gravitational wave background (SGWB) induced by primordial curvature perturbations. In this talk, I will present how current and future gravitational wave observatories—including Pulsar...
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22/05/2025, 11:40
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