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"Dark matter is conventionally believed to be an integral part of all galaxies — the glue that holds them together and the underlying scaffolding upon which they are built," explains co-author Allison Merritt from Yale University and the Max Planck Institute for Astronomy, Germany...
Merritt remarks: "There is no theory that predicts these types of galaxies — how you actually go about forming one of these things is completely unknown." | ESA/Hubble
#galaxies #GalaxyFormation #DarkMatter
Merritt remarks: "There is no theory that predicts these types of galaxies — how you actually go about forming one of these things is completely unknown." | ESA/Hubble
#galaxies #GalaxyFormation #DarkMatter
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I knew going into the TV show marathon that Dark Matter only had 3 seasons, 39 episodes.
Have now watched all, enjoyed the series, but shouting at Syfy for canceling the show at such a cliffhanger peak!
#DarkMatter
Have now watched all, enjoyed the series, but shouting at Syfy for canceling the show at such a cliffhanger peak!
#DarkMatter
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Scientists have never found a galaxy w/out dark matter. Until Now. | WIRED ~
“Finding a galaxy w/no #DarkMatter is an oxymoron . . . like finding a body w/no skeleton."
#Astrophysics #Universe #physics #cosmology #astronomy #Space #spaceexploration #NASA
“Finding a galaxy w/no #DarkMatter is an oxymoron . . . like finding a body w/no skeleton."
#Astrophysics #Universe #physics #cosmology #astronomy #Space #spaceexploration #NASA
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The Birth of Electron-Positron Pairs in a Vacuum, as a Manifestation of the Instability of Dark Matter - By Stanislav Konstantinov
Read More : https://www.arcjournals.org/pdfs/ijarps/v4-i11/3.pdf
International Journal of Advanced Research in Physical Science
Read More About Journal : https://www.arcjournals.org/international-journal-of-advanced-research-in-physical-science #PhysicalScience #DarkMatter #Electron
Read More : https://www.arcjournals.org/pdfs/ijarps/v4-i11/3.pdf
International Journal of Advanced Research in Physical Science
Read More About Journal : https://www.arcjournals.org/international-journal-of-advanced-research-in-physical-science #PhysicalScience #DarkMatter #Electron
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Gravitational Waves Could Reveal Primordial Black Hole Mergers
What are primordial black holes (PBHs)?
They are a hypothetical type of black holes that could have formed in the very early Universe (less than one second after the Big-Bang), during the so-called radiation dominated era. The essential ingredient for a primordial black hole to form is a fluctuation in the density of the Universe, inducing its gravitational collapse. There are several mechanisms able to produce such inhomogeneities in the context of cosmic inflation (in hybrid inflation models, for example axion inflation, ...), reheating, or cosmological phase transitions.
In summary, some cosmological models suggest that— immediately after the Big Bang, some 13.82 billion years ago— the early quantum density fluctuations may have been dramatic enough to create black holes — known as primordial black holes — and these ancient Big Bang remnants may still exist to this day.
These theoretical models, however, are hard to test as observing the universe immediately after the Big Bang is very difficult. But recent discoveries of gravitational waves from black hole and neutron star mergers have ushered in a new era of astronomy, and astronomers have an observational tool at their disposal.
So, even if the standard theory predicts that black holes are born from supernovae, which implies that they couldn’t have formed any earlier than the first stars, in a new study published in Physical Review Letters, researchers have proposed that if we have the ability to detect gravitational waves produced before the first stars died, we may be able to carry out astronomical archaeological dig of sorts to possibly find evidence of these ancient black holes.
Savvas Koushiappas of Brown University, Rhode Island, and Abraham Loeb of Harvard University came up with a way to test this idea by calculating the earliest epoch in which baryonic black holes—those made of the matter we see in stars and planets—can form.
"The idea is very simple," Koushiappas said. "With future gravitational wave experiments, we'll be able to look back to a time before the formation of the first stars. So if we see black hole merger events before stars existed, then we'll know that those black holes are not of stellar origin."
Cosmologists measure how far back in time an event occurred using redshift -- the stretching of the wavelength of light associated with the expansion of the universe. Events further back in time are associated with larger redshifts. For this study, Koushiappas and Loeb calculated the redshift at which black hole mergers should no longer be detected assuming only stellar origin.
They find that beyond a redshift of about 40 —where observed objects were formed during the first 65 million years following the big bang—the rate of collisions should drop to less than one per year. This epoch should be within reach of the next generation of gravitational-wave observatories.
Finding evidence for primordial black holes could shed light on the nature of dark matter or on the origin of cosmic structure in the early Universe.
► Read the article from Brown University: "Gravitational waves could shed light on the origin of black holes">>
https://news.brown.edu/articles/2017/11/primordial
► The paper "Maximum Redshift of Gravitational Wave Merger Events", published in Physical Review Letters, 2017>>
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.221104
► Image: Black holes collide
Credit: Simulating eXtreme Spacetimes (SXS) Project (http://www.black-holes.org)
Further reading and references
► Gravitational Waves Could Reveal Black Hole Origins>>
https://physics.aps.org/synopsis-for/10.1103/PhysRevLett.119.221104
► Gravitational Waves Might Reveal Primordial Black Hole Mergers Just After the Big Bang>>
https://astroengine.com/2017/11/30/gravitational-waves-might-reveal-primordial-black-hole-mergers-just-after-the-big-bang/
► Primordial black hole>> https://en.wikipedia.org/wiki/Primordial_black_hole
► NASA Scientist Suggests Possible Link Between Primordial Black Holes and Dark Matter>>
https://www.nasa.gov/feature/goddard/2016/nasa-scientist-suggests-possible-link-between-primordial-black-holes-and-dark-matter
#Astronomy, #PrimordialBlackHoles, #Cosmology, #DarkMatter, #GravitationalWaves, #Astrophysics, #Research
What are primordial black holes (PBHs)?
They are a hypothetical type of black holes that could have formed in the very early Universe (less than one second after the Big-Bang), during the so-called radiation dominated era. The essential ingredient for a primordial black hole to form is a fluctuation in the density of the Universe, inducing its gravitational collapse. There are several mechanisms able to produce such inhomogeneities in the context of cosmic inflation (in hybrid inflation models, for example axion inflation, ...), reheating, or cosmological phase transitions.
In summary, some cosmological models suggest that— immediately after the Big Bang, some 13.82 billion years ago— the early quantum density fluctuations may have been dramatic enough to create black holes — known as primordial black holes — and these ancient Big Bang remnants may still exist to this day.
These theoretical models, however, are hard to test as observing the universe immediately after the Big Bang is very difficult. But recent discoveries of gravitational waves from black hole and neutron star mergers have ushered in a new era of astronomy, and astronomers have an observational tool at their disposal.
So, even if the standard theory predicts that black holes are born from supernovae, which implies that they couldn’t have formed any earlier than the first stars, in a new study published in Physical Review Letters, researchers have proposed that if we have the ability to detect gravitational waves produced before the first stars died, we may be able to carry out astronomical archaeological dig of sorts to possibly find evidence of these ancient black holes.
Savvas Koushiappas of Brown University, Rhode Island, and Abraham Loeb of Harvard University came up with a way to test this idea by calculating the earliest epoch in which baryonic black holes—those made of the matter we see in stars and planets—can form.
"The idea is very simple," Koushiappas said. "With future gravitational wave experiments, we'll be able to look back to a time before the formation of the first stars. So if we see black hole merger events before stars existed, then we'll know that those black holes are not of stellar origin."
Cosmologists measure how far back in time an event occurred using redshift -- the stretching of the wavelength of light associated with the expansion of the universe. Events further back in time are associated with larger redshifts. For this study, Koushiappas and Loeb calculated the redshift at which black hole mergers should no longer be detected assuming only stellar origin.
They find that beyond a redshift of about 40 —where observed objects were formed during the first 65 million years following the big bang—the rate of collisions should drop to less than one per year. This epoch should be within reach of the next generation of gravitational-wave observatories.
Finding evidence for primordial black holes could shed light on the nature of dark matter or on the origin of cosmic structure in the early Universe.
► Read the article from Brown University: "Gravitational waves could shed light on the origin of black holes">>
https://news.brown.edu/articles/2017/11/primordial
► The paper "Maximum Redshift of Gravitational Wave Merger Events", published in Physical Review Letters, 2017>>
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.221104
► Image: Black holes collide
Credit: Simulating eXtreme Spacetimes (SXS) Project (http://www.black-holes.org)
Further reading and references
► Gravitational Waves Could Reveal Black Hole Origins>>
https://physics.aps.org/synopsis-for/10.1103/PhysRevLett.119.221104
► Gravitational Waves Might Reveal Primordial Black Hole Mergers Just After the Big Bang>>
https://astroengine.com/2017/11/30/gravitational-waves-might-reveal-primordial-black-hole-mergers-just-after-the-big-bang/
► Primordial black hole>> https://en.wikipedia.org/wiki/Primordial_black_hole
► NASA Scientist Suggests Possible Link Between Primordial Black Holes and Dark Matter>>
https://www.nasa.gov/feature/goddard/2016/nasa-scientist-suggests-possible-link-between-primordial-black-holes-and-dark-matter
#Astronomy, #PrimordialBlackHoles, #Cosmology, #DarkMatter, #GravitationalWaves, #Astrophysics, #Research
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#DARKMATTER #SCIENCE #PHYSICS #DISCLOSURE
The Universe | The Search for WIMPs or Dark Matter Particles -- An Impossible Feat? (Video)
https://stillnessinthestorm.com/2018/03/the-universe-the-search-for-wimps-or-dark-matter-particles-is-dark-matter-theory-is-dying-video/
The Universe | The Search for WIMPs or Dark Matter Particles -- An Impossible Feat? (Video)
https://stillnessinthestorm.com/2018/03/the-universe-the-search-for-wimps-or-dark-matter-particles-is-dark-matter-theory-is-dying-video/
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