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UrduThe holographic principle is used to describe the expanding universe in de Sitter space. It provides a solution to Einstein’s general relativity equation with a positive cosmological constant. The proposed model uses a negative cosmological constant to account for gravity on anti-de Sitter space.
Tag: Black Hole
‘Black Hole Police’ Discover a Dormant Black Hole Outside of the Milky Way Galaxy
It is the first dormant stellar-mass black hole to be detected outside of the Milky Way galaxy, the team claims.
Black Hole Activity Not Evolving in Central Cluster Galaxies
University of Kentucky postdoc presents important new findings about black holes and their host galaxies at American Astronomical Society meeting
Milky Way’s Black Hole Was “Birth Cry” of Radio Astronomy
The new image of the black hole at the center of our Milky Way galaxy provides the closest look yet at the region from which radio waves from beyond the Earth were first detected in 1932 — by Karl Jansky, the father of radio astronomy.
Gamma ray discovery could advance understanding of UFOs’ role in the evolution of galaxies
Researchers detected gamma rays from ultra-fast outflows (UFOs) in several nearby galaxies for the first time, providing a basis for scientists to understand what happened in our own Milky Way galaxy.
Black hole size revealed by its eating pattern
The feeding patterns of black holes offer insight into their size, researchers report. A new study revealed that the flickering in the brightness observed in actively feeding supermassive black holes is related to their mass.
First Detection of Light From Behind a Black Hole
Watching X-rays flung out into the universe by the supermassive black hole at the center of a galaxy 800 million light-years away, Stanford University astrophysicist Dan Wilkins noticed an intriguing pattern.
Quantum machine learning hits a limit
A new theorem from the field of quantum machine learning has poked a major hole in the accepted understanding about information scrambling.
VLA Helps Astronomers Make New Discoveries About Star-Shredding Events
New studies using the VLA and other telescopes have added to our knowledge of what happens when a black hole shreds a star, but also have raised new questions that astronomers must tackle.
Astronomers find possible hints of gravitational waves
An international team of astronomers report they have found the first faint, low-frequency whispers that may be gravitational waves from gigantic, colliding black holes in distant galaxies.
VLA Sky Survey Reveals Newborn Jets in Distant Galaxies
Comparing data from VLA sky surveys made some two decades apart revealed that the black hole-powered “engines” at the cores of some distant galaxies have launched new, superfast jets of material during the interval between the surveys.
IMAGE RELEASE: Galaxies in the Perseus Cluster
New VLA images show how the crowded environment of a cluster of galaxies affects the individual galaxies, helping astronomers better understand some of the complex details of such an environment.
NOvA turns its eyes to the skies
The NOvA experiment, best known for its measurements of neutrino oscillations using particle beams from Fermilab accelerators, has been turning its attention to measurements of cosmic phenomena. In a series of results, NOvA reports on neutrinos from supernovae, gravitational-wave events from black hole mergers, muons from cosmic rays, and its search for the elusive monopole.
NRAO Contest Winners Illustrate Diverse Cosmic Phenomena
Winners in NRAO’s VLA 40th Anniversary Image Contest are from around the world, and their works illustrate a fascinating variety of celestial objects. Entries combined observational data from the VLA with data from optical, infrared, and X-ray telescopes, and from computer simulations.
Astronomers Take a Closer Look at the Centers of Galaxies
New study recently published in The Astrophysical Journal reveals a diverse range of types and locations of clouds across various active galactic nuclei and their host galaxies.
IMAGE RELEASE: A Galaxy’s Stop-and-Start Young Radio Jets
VLBA image shows details of a young jet emitted from the core of an active galaxy, revealing that the jet activity stopped, then restarted only a decade ago.
ALMA Finds Possible Sign of Neutron Star in Supernova 1987A
Based on ALMA observations and a theoretical follow-up study, scientists suggest that a neutron star might be hiding deep inside the remains of Supernova 1987A.
Uncovering the invisible universe
Physicist Sean McWilliams has created an exact mathematical formula to explain the gravitational wave signals that have been observed from colliding black holes, which serve as a key validation of Albert Einstein’s Theory of General Relativity.
Monster Black Hole Found in the Early Universe
Astronomers have discovered the second most distant quasar ever found, using the international Gemini Observatory and Cerro Tololo Inter-American Observatory (CTIO), Programs of NSF’s NOIRLab. It is also the first quasar to receive an indigenous Hawaiian name, Pōniuāʻena. The quasar contains a monster black hole, twice the mass of the black hole in the only other quasar found at the same epoch, challenging the current theories of supermassive black hole formation and growth in the early Universe.
UAH has significant role in LEAP, a mission selected for NASA flight review
In collaboration with Marshall Space Flight Center (MSFC), the Center for Space Plasma and Aeronomic Research (CSPAR) at The University of Alabama in Huntsville (UAH) has a significant role in LEAP – the LargE Area burst Polarimeter – a mission that is one of four proposals approved by NASA for further review.
The Turbulent Life of Two Supermassive Black Holes Caught in a Galaxy Crash
An international team of astronomers used the Atacama Large Millimeter/submillimeter Array (ALMA) to create the most detailed image yet of the gas surrounding two supermassive black holes in a merging galaxy.
Astronomers Find Wandering Massive Black Holes in Dwarf Galaxies
Studies with the VLA indicate that roughly half of the massive black holes in dwarf galaxies are not in the centers of those galaxies. This gives astronomers new insights into the conditions in which similar black holes formed and grew in the early history of the Universe.
Black Hole Eats Star
Join Melissa Hoffman of the National Radio Astronomy Observatory for a tour of one of the most disruptive events in Universe.
Here’s how a Vanderbilt astrophysicist plans to observe a ‘black hole symphony’ using gravitational wave astronomy
New research led by Vanderbilt astrophysicist Karan Jani presents a compelling roadmap for capturing intermediate-mass black hole activity.
Going Against the Flow Around a Supermassive Black Hole
At the center of a galaxy called NGC 1068, a supermassive black hole hides within a thick doughnut-shaped cloud of dust and gas. When astronomers used the Atacama Large Millimeter/submillimeter Array (ALMA)
to study this cloud in more detail, they made an unexpected discovery that could explain why supermassive black holes grew so rapidly in the early Universe.
“Thanks to the spectacular resolution of ALMA, we measured the movement of gas in the inner orbits around the black hole,” explains Violette Impellizzeri of the National Radio Astronomy Observatory (NRAO), working at ALMA in Chile and lead author on a paper published in the Astrophysical Journal. “Surprisingly, we found two disks of gas rotating in opposite directions.”