Stimulated-emission effects in particle creation near black holes

1976 ◽  
Vol 13 (12) ◽  
pp. 3176-3182 ◽  
Author(s):  
Robert M. Wald
Keyword(s):  
Black Holes ◽  
Particle Creation ◽  
Stimulated Emission

scholarly journals Particle creation by black holes

1976 ◽  
Vol 46 (2) ◽  
pp. 206-206 ◽  
Author(s):  
S. W. Hawking
Keyword(s):  
Black Holes ◽  
Particle Creation

scholarly journals Molecules as tracers of galaxy evolution

2012 ◽  
Vol 8 (S292) ◽  
pp. 199-208 ◽  
Author(s):  
Susanne Aalto
Keyword(s):  
Black Holes ◽  
Star Formation ◽  
High Resolution ◽  
Galaxy Evolution ◽  
Large Scale ◽  
Short Review ◽  
Stimulated Emission ◽  
Molecular Gas ◽  
Infrared Galaxies ◽  
Luminous Infrared Galaxies

AbstractStudying the molecular phase of the interstellar medium in galaxies is fundamental for the understanding of the onset and evolution of star formation and the growth of supermassive black holes. We can use molecules as observational tools exploiting them as tracers of chemical, physical and dynamical conditions. In this short review, key molecules (e.g. HCN, HCO+, HNC, HC3N, CN, H3O+) in identifying the nature of buried activity and its evolution are discussed including some standard astrochemical scenarios. Furthermore, we can use IR excited molecular emission to probe the very inner regions of luminous infrared galaxies (LIRGs) allowing us to get past the optically thick dust barrier of the compact obscured nuclei, e.g. in the dusty LIRG NGC4418. High resolution studies are often necessary to separate effects of excitation and radiative transport from those of chemistry - one example is absorption and effects of stimulated emission in the ULIRG Arp220. Finally, molecular gas in large scale galactic outflows is briefly discussed.

scholarly journals New sources of gravitational wave signals: The black hole graviton laser

2018 ◽  
Vol 27 (14) ◽  
pp. 1847009
Author(s):  
Éric Dupuis ◽  
M. B. Paranjape
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Gravitational Wave ◽  
Path Length ◽  
Stimulated Emission ◽  
Laser Beams ◽  
Lasing Medium ◽  
Path Lengths ◽  
The Universe ◽  
Very High

A graviton laser works, in principle, by the stimulated emission of coherent gravitons from a lasing medium. For significant amplification, we must have a very long path length and/or very high densities. Black holes and the existence of weakly interacting sub-eV dark matter particles (WISPs) solve both of these obstacles. Orbiting trajectories for massless particles around black holes are well understood [C. Misner, K. Thorne and J. Wheeler, Gravitation (W. H Freeman, 1973)]1 and allow for arbitrarily long graviton path lengths. Superradiance from Kerr black holes of WISPs can provide the sufficiently high density [A. Arvanitaki, M. Baryakhtar and X. Huang, Phys. Rev. D 91 (2015) 084011, arXiv:1411.2263 ]2. This suggests that black holes can act as efficient graviton lasers. Thus directed graviton laser beams have been emitted since the beginning of the universe and give rise to new sources of gravitational wave signals. To be in the path of particularly harmfully amplified graviton death rays will not be pleasant.

scholarly journals Spinor particle creation in near extremal Reissner–Nordström black holes

2015 ◽  
Vol 32 (19) ◽  
pp. 195003 ◽  
Author(s):  
Chiang-Mei Chen ◽  
Jia-Rui Sun ◽  
Fu-Yi Tang ◽  
Ping-Yen Tsai
Keyword(s):  
Black Holes ◽  
Particle Creation ◽  
Spinor Particle

Quantum particle creation (Hawking effect) in nonstationary black holes

1976 ◽  
Vol 29 (2) ◽  
pp. 1012-1021 ◽  
Author(s):  
I. V. Volovich ◽  
V. A. Zagrebnov ◽  
V. P. Frolov
Keyword(s):  
Black Holes ◽  
Quantum Particle ◽  
Particle Creation ◽  
Hawking Effect
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