scholarly journals Black holes and gravitational waves in models of minicharged dark matter

2016 ◽  
Vol 2016 (05) ◽  
pp. 054-054 ◽  
Author(s):  
Vitor Cardoso ◽  
Caio F.B. Macedo ◽  
Paolo Pani ◽  
Valeria Ferrari
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Gravitational Waves

A Tale of Two Infinities

2021 ◽  
Author(s):  
Gianfranco Bertone
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Gravitational Waves ◽  
Direct Detection ◽  
Traditional Approach ◽  
Fundamental Physics ◽  
Modern Cosmology ◽  
Nobel Prize In Physics ◽  
The Universe ◽  
Modern Astronomy

The spectacular advances of modern astronomy have opened our horizon on an unexpected cosmos: a dark, mysterious Universe, populated by enigmatic entities we know very little about, like black holes, or nothing at all, like dark matter and dark energy. In this book, I discuss how the rise of a new discipline dubbed multimessenger astronomy is bringing about a revolution in our understanding of the cosmos, by combining the traditional approach based on the observation of light from celestial objects, with a new one based on other ‘messengers’—such as gravitational waves, neutrinos, and cosmic rays—that carry information from otherwise inaccessible corners of the Universe. Much has been written about the extraordinary potential of this new discipline, since the 2017 Nobel Prize in physics was awarded for the direct detection of gravitational waves. But here I will take a different angle and explore how gravitational waves and other messengers might help us break the stalemate that has been plaguing fundamental physics for four decades, and to consolidate the foundations of modern cosmology.

Erratum: Black holes and gravitational waves in models of minicharged dark matter

2020 ◽  
Vol 2020 (04) ◽  
pp. E01-E01 ◽  
Author(s):  
Vitor Cardoso ◽  
Caio F.B Macedo ◽  
Paolo Pani ◽  
Valeria Ferrari
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Gravitational Waves

scholarly journals Improved constraints from ultra-faint dwarf galaxies on primordial black holes as dark matter

2020 ◽  
Vol 492 (4) ◽  
pp. 5247-5260 ◽  
Author(s):  
Jakob Stegmann ◽  
Pedro R Capelo ◽  
Elisa Bortolas ◽  
Lucio Mayer
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Gravitational Waves ◽  
Lognormal Distribution ◽  
Dwarf Galaxies ◽  
Relaxation Processes ◽  
Primordial Black Holes ◽  
Stellar Component ◽  
Stellar Velocity ◽  
Velocity Dispersions

ABSTRACT Soon after the recent first ever detection of gravitational waves from merging black holes it has been suggested that their origin is primordial. Appealingly, a sufficient number of primordial black holes (PBHs) could also partially or entirely constitute the dark matter (DM) in our Universe. However, recent studies on PBHs in ultra-faint dwarf galaxies (UFDGs) suggest that they would dynamically heat up the stellar component due to two-body relaxation processes. From the comparison with the observed stellar velocity dispersions and the stellar half-light radii, it was claimed that only PBHs with masses $\lesssim 10\, {\rm M}_\odot$ can significantly contribute to the DM. In this work, we improve the latter constraints by considering the largest observational sample of UFDGs and by allowing the PBH masses to follow an extended (lognormal) distribution. By means of collisional Fokker–Planck simulations, we explore a wide parameter space of UFDGs containing PBHs. The analysis of the half-light radii and velocity dispersions resulting from the simulations leads to three general findings that exclude PBHs with masses $\sim \mathcal {O}(1\operatorname{-}100)\, {\rm M}_\odot {}$ from constituting all of the DM: (i) we identify a critical sub-sample of UFDGs that only allows for $\sim \mathcal {O}(1)\, {\rm M}_\odot$ PBH masses; (ii) for any PBH mass, there is an UFDG in our sample that disfavours it; (iii) the spatial extensions of a majority of simulated UFDGs containing PBHs are too large to match the observed.

scholarly journals Prospective sensitivities of atom interferometers to gravitational waves and ultralight dark matter

2021 ◽  
Vol 380 (2216) ◽  
Author(s):  
Leonardo Badurina ◽  
Oliver Buchmueller ◽  
John Ellis ◽  
Marek Lewicki ◽  
Christopher McCabe ◽  
...  
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Gravitational Waves ◽  
Early Universe ◽  
Particle Physics ◽  
Cold Atom ◽  
Space Mission ◽  
Primordial Black Holes ◽  
Theme Issue ◽  
Atom Interferometers

We survey the prospective sensitivities of terrestrial and space-borne atom interferometers to gravitational waves generated by cosmological and astrophysical sources, and to ultralight dark matter. We discuss the backgrounds from gravitational gradient noise in terrestrial detectors, and also binary pulsar and asteroid backgrounds in space-borne detectors. We compare the sensitivities of LIGO and LISA with those of the 100 m and 1 km stages of the AION terrestrial AI project, as well as two options for the proposed AEDGE AI space mission with cold atom clouds either inside or outside the spacecraft, considering as possible sources the mergers of black holes and neutron stars, supernovae, phase transitions in the early Universe, cosmic strings and quantum fluctuations in the early Universe that could have generated primordial black holes. We also review the capabilities of AION and AEDGE for detecting coherent waves of ultralight scalar dark matter. AION-REPORT/2021-04 KCL-PH-TH/2021-61, CERN-TH-2021-116 This article is part of the theme issue ‘Quantum technologies in particle physics’.

Black Holes

2021 ◽  
pp. 53-65
Author(s):  
Gianfranco Bertone
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Dark Energy ◽  
Gravitational Waves ◽  
Nuclear Fuel ◽  
Big Bang ◽  
The Sun ◽  
Modern Physics ◽  
The Big Bang ◽  
The Universe

In the second part of the book, I argue that the four biggest mysteries of modern physics and astronomy—dark matter, dark energy, black holes, and the Big Bang—sink their roots into the physics of the infinitely small. And I argue that gravitational waves may shed new light on, and possibly solve, each of these four mysteries. I start here by introducing the problem of dark matter, the mysterious substance that permeates the Universe at all scales and describe the gravitational waves observations that might soon elucidate its nature. The next time you see the Sun shining in the sky, consider this: what blinds your eyes and warms your skin is an immense nuclear furnace, which transforms millions of tons of nuclear fuel into energy every second. And when you contemplate the night sky, try to visualize it for what it essentially is: an endless expanse of colossal natural reactors, forging the atoms that we, and everything that surrounds us, are made of.

scholarly journals Gravitational waves from superradiant instabilities of rotating black holes

2021 ◽  
Vol 36 (33) ◽  
Author(s):  
Shrobana Ghosh
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Standard Model ◽  
Gravitational Waves ◽  
Direct Detection ◽  
New Era ◽  
Compact Binary ◽  
The Standard Model ◽  
Rotating Black Holes ◽  
Shed Light

Direct detection of gravitational waves from several compact binary coalescences has ushered in a new era of astronomy. It has opened up the possibility of detecting ultralight bosons, predicted by extensions of the Standard Model, from their gravitational signatures. This is of particular interest as some of these hypothetical particles could be components of dark matter that are expected to interact very weakly with Standard Model particles, if at all, but they would gravitate as usual. Ultralight bosons can trigger superradiant instabilities of rotating black holes and form bosonic clouds that would emit gravitational waves. In this paper, we present an overview of such instabilities as gravitational wave sources and assess the ability of current and future detectors to shed light on potential dark matter candidates.

scholarly journals A Status Report on the Phenomenology of Black Holes in Loop Quantum Gravity: Evaporation, Tunneling to White Holes, Dark Matter and Gravitational Waves

2018 ◽  
Author(s):  
Aurélien Barrau ◽  
Killian Martineau ◽  
Flora Moulin
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Quantum Gravity ◽  
Gravitational Waves ◽  
Loop Quantum Gravity ◽  
Space Time ◽  
Status Report ◽  
Hawking Evaporation

The understanding of black holes in loop quantum gravity is becoming increasingly accurate. This review focuses on the possible experimental or observational consequences of the underlying spinfoam structure of space-time. It adresses both the aspects associated with the Hawking evaporation and the ones due to the possible existence of a bounce. Finally, consequences for dark matter and gravitational waves are considered.

scholarly journals Gravitational waves: A review on the future astronomy

2022 ◽  
pp. 38-50
Author(s):  
Rabinarayan Swain ◽  
Priyasmita Panda ◽  
Hena Priti Lima ◽  
Bijayalaxmi Kuanar ◽  
Biswajit Dalai
Keyword(s):  
Black Holes ◽  
Dark Matter ◽  
Dark Energy ◽  
Neutron Stars ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Binary Systems ◽  
Hubble Constant ◽  
New Approach ◽  
Different Sources

Detection of Gravitational waves opened a new path for cosmological study in a new approach. From the detection of gravitational waves signal by advanced LIGO, its research climbed the peak. After the collaboration of LIGO and Virgo, several observations get collected from different sources of binary systems like black holes, binary neutron stars even both binary black hole and neutron star. The rigorous detection of gravitational signals may provide an additional thrust in the study of complex binary systems, dark matter, dark energy, Hubble constant, etc. In this review paper, we went through multiple research manuscripts to analyze gravitational wave signals. Here we have reviewed the history and current situation of gravitational waves detection, and we explained the concept and process of detection. Also, we go through different parts of a detector and their working. Then multiple gravitational wave signals are focused, originated from various sources and then found correlation between them. From this, the contribution of gravitational waves in different fields like complex binary systems (black holes, neutron stars), dark matter, dark energy and Hubble Constant have been discussed in this manuscript.

scholarly journals Gravitational Waves from Mirror World

Physics ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 67-75
Author(s):  
Revaz Beradze ◽  
Merab Gogberashvili
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Dark Matter ◽  
Star Formation ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Binary Systems ◽  
Laser Interferometer ◽  
Matter Density ◽  
Mirror Matter

In this paper we consider the properties of the 10 confirmed by the LIGO (Laser Interferometer Gravitational-Wave Observatory) Collaboration gravitational wave signals from the black hole mergers. We want to explain non-observation of electromagnetic counterpart and higher then expected merging rates of these events, assuming the existence of their sources in the hidden mirror universe. Mirror matter, which interacts with our world only through gravity, is a candidate of dark matter and its density can exceed ordinary matter density five times. Since mirror world is considered to be colder, star formation there started earlier and mirror black holes had more time to pick up the mass and to create more binary systems within the LIGO reachable zone. In total, we estimate factor of 15 amplification of black holes merging rate in mirror world with respect to our world, which is consistent with the LIGO observations.

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