Formation of Primordial Black Hole Clusters from Phase Transitions in the Early Universe

2019 ◽  
Vol 46 (3) ◽  
pp. 97-99
Author(s):  
V. V. Nikulin ◽  
S. G. Rubin ◽  
A. A. Kirillov ◽  
L. A. Khromykh
Keyword(s):  
Black Hole ◽  
Phase Transitions ◽  
Early Universe ◽  
Primordial Black Hole

The Conservative Side of the Natural Science

2019 ◽  
Author(s):  
Adib Rifqi Setiawan
Keyword(s):  
Black Hole ◽  
Free Will ◽  
Early Universe ◽  
Natural Science ◽  
Molecular Basis ◽  
Evolutionary Tree ◽  
Primordial Black Hole ◽  
Natural Scientist ◽  
Classical Physics ◽  
Modern Physics

Natural scientist — like physicist and biologist — may think themselves as liberal. They seem, however, to have a strong conservative that impacts diversity in research and unity in thinking. I explored why this conservative in direction exists in the literature and the implications that it has on our — as human — choices for research and thinking about nature. My exploration revealed that the directional conservative expressed by ‘conserved from species X to human’ that indicate from lower to higher organism. In physics, as well, the directional conservative expressed by ‘make a Y or Z from modern physics theory analogous to the classical one’ that indicate we are still working to figure out the details of how classical physics emerge from the modern domain. It implications on our choices for research is make us feel confusion to answer questions like: ‘Can one have atoms in which the nucleus is a tiny primordial black hole formed in the early universe?’ in physics, nor ‘If human have free will, where in the evolutionary tree did it develop?’ in biology. The conservative also implicates on our thinking about nature that hard to imagine how free will can operate if our behavior — as ‘higher’ organism — is determined by physical law based on our understanding of the molecular basis of biology.

scholarly journals Upper limits on the amplitude of ultra-high-frequency gravitational waves from graviton to photon conversion

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
A. Ejlli ◽  
D. Ejlli ◽  
A. M. Cruise ◽  
G. Pisano ◽  
H. Grote
Keyword(s):  
Magnetic Field ◽  
Black Hole ◽  
Gravitational Waves ◽  
Early Universe ◽  
Confidence Level ◽  
High Frequency ◽  
Primordial Black Hole ◽  
Black Hole Evaporation ◽  
Upper Limits ◽  
Photon Conversion

AbstractIn this work, we present the first experimental upper limits on the presence of stochastic gravitational waves in a frequency band with frequencies above 1 THz. We exclude gravitational waves in the frequency bands from $$\left( 2.7 - 14\right) \times 10^{14}$$2.7-14×1014 Hz and $$\left( 5 - 12\right) \times 10^{18}$$5-12×1018 Hz down to a characteristic amplitude of $$h_c^{\mathrm{min}}\approx 6\times 10^{-26}$$hcmin≈6×10-26 and $$h_c^{\mathrm{min}}\approx 5\times 10^{-28}$$hcmin≈5×10-28 at 95% confidence level, respectively. To obtain these results, we used data from existing facilities that have been constructed and operated with the aim of detecting weakly interacting slim particles, pointing out that these facilities are also sensitive to gravitational waves by graviton to photon conversion in the presence of a magnetic field. The principle applies to all experiments of this kind, with prospects of constraining (or detecting), for example, gravitational waves from light primordial black-hole evaporation in the early universe.

scholarly journals Formation and evolution of primordial black hole binaries in the early universe

2019 ◽  
Vol 2019 (02) ◽  
pp. 018-018 ◽  
Author(s):  
Martti Raidal ◽  
Christian Spethmann ◽  
Ville Vaskonen ◽  
Hardi Veermäe
Keyword(s):  
Black Hole ◽  
Early Universe ◽  
Primordial Black Hole ◽  
Black Hole Binaries ◽  
Formation And Evolution

scholarly journals The primordial black hole mass range

2016 ◽  
Vol 31 (12) ◽  
pp. 1650064 ◽  
Author(s):  
Paul H. Frampton
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Dark Matter ◽  
Early Universe ◽  
Parametric Resonance ◽  
Mass Range ◽  
Primordial Black Hole ◽  
Black Hole Mass ◽  
Arbitrary Mass ◽  
Hybrid Inflation

We investigate Primordial Black Hole (PBH) formation by which we mean black holes produced in the early Universe during radiation domination. After discussing the range of PBH mass permitted in the original mechanism of Carr and Hawking, hybrid inflation with parametric resonance is presented as an existence theorem for PBHs of arbitrary mass. As proposed in arXiv:1510.00400, PBHs with many solar masses can provide a solution to the dark matter problem in galaxies. PBHs can also explain dark matter observed in clusters and suggest a primordial origin for Supermassive Black Holes (SMBHs) in galactic cores.

scholarly journals Primordial black hole production during first-order phase transitions

2022 ◽  
Vol 105 (2) ◽  
Author(s):  
Jing Liu ◽  
Ligong Bian ◽  
Rong-Gen Cai ◽  
Zong-Kuan Guo ◽  
Shao-Jiang Wang
Keyword(s):  
Black Hole ◽  
Phase Transitions ◽  
Primordial Black Hole ◽  
First Order ◽  
First Order Phase
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