A5029477150- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Biofield Effects and Biophysics
King's College London
2017-2021
University College London
2017-2019
University of London
2017-2019
Max Planck Institute for Astrophysics
2019
Astrophysical observations of spinning BHs, which span $ 5M_\odot\lesssim M_{\rm BH}\lesssim 5\times 10^8 M_\odot$, can be used to exclude the existence certain massive bosons via superradiance phenomenon. In this work, we explore for first time how these measurements constrain properties statistical distributions masses multiple bosonic fields. Quite generally, our methodology excludes $N_{\rm ax}\gtrsim 30$ scalar fields with a range mass distribution widths and central values spanning...
We perform an extensive analysis of the statistics axion masses and interactions in compactifications type IIB string theory, we show that black hole superradiance excludes some regions Calabi-Yau moduli space. Regardless cosmological model, a theory with whose mass falls superradiant band can be probed by measured properties astrophysical holes, unless self-interaction is large enough to disrupt formation condensate. study ensemble on hypersurfaces, $1 \leq h^{1,1} 491$ closed axions,...
Axions arise in many theoretical extensions of the Standard Model particle physics, particular ``string axiverse.'' If axion masses, ${m}_{a}$, and (effective) decay constants, ${f}_{a}$, lie specific ranges, then axions contribute to cosmological dark matter energy densities. We compute background (quasi)observables for models with a large number fields, ${n}_{\text{ax}}\ensuremath{\sim}\mathcal{O}(10--100)$, masses constants drawn from statistical distributions. This reduces parameters...
Black Hole measurements have grown significantly in the new age of gravitation wave astronomy from LIGO observations binary black hole mergers. As yet unobserved massive ultralight bosonic fields represent one most exciting features Standard Model extensions, capable providing solutions to numerous paradigmatic issues particle physics and cosmology. In this work we explore bounds spinning astrophysical holes their angular momentum energy transfer condensates which can form surrounding via...
We obtain constraints from black hole superradiance in an ensemble of compactifications type IIB string theory. The require knowing only the axion masses and self-interactions, are insensitive to cosmological model. study more than $2 \cdot 10^5$ Calabi-Yau manifolds with Hodge numbers $1\leq h^{1,1}\leq 491$ compute spectrum at two reference points moduli space for each geometry. Our computation classical theory is explicit, while instanton-generated potential we use a conservative measured...
We study the relative contribution of cusps and pseudocusps, on cosmic (super)strings, to emitted bursts gravitational waves. The wave emission in vicinity highly relativistic points string follows, for a high enough frequency, logarithmic decrease. slope has been analytically found be $\ensuremath{-}4/3$ reaching exactly speed light limit $c=1$. investigate variations this high-frequency behavior with respect velocity considered, strings formed through numerical simulation, we then compute...
Consistent frameworks of quantum gravity often predict the existence large numbers ultralight pseudoscalar degrees freedom, forming phenomenological landscape String Axiverse. The complexity extra-dimensional compactification manifolds and vacua determine that these fields could possess parameters with cosmologically significant scales, which span many decades. Astrophysical observations stellar binary supermassive black hole systems can be used to exclude certain massive bosons, via...
Consistent frameworks of quantum gravity often predict the existence large numbers ultralight pseudoscalar degrees freedom, forming phenomenological landscape String Axiverse. The complexity extra-dimensional compactification manifolds and vacua determine that these fields could possess parameters with cosmologically significant scales, which span many decades. Astrophysical observations stellar binary supermassive black hole systems can be used to exclude certain massive bosons, via...