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In today’s enterprise, even just a split second in latency can impact performance and access to data — and, thus, the ability to manage and immediately act on it.
But the physics and costs of multicloud and hybrid cloud environments make near-instantaneous response times all but impossible.
Then a mere scientist pulled it off. Otto von Guericke invented a pump to suck the air from within a hollow copper sphere, establishing perhaps the first high-quality vacuum on Earth. In a theatrical demonstration in 1,654, he showed that not even two teams of horses straining to rip apart the watermelon-size ball could overcome the suction of nothing.
Since then, the vacuum has become a bedrock concept in physics, the foundation of any theory of something. Von Guericke’s vacuum was an absence of air. The electromagnetic vacuum is the absence of a medium that can slow down light. And a gravitational vacuum lacks any matter or energy capable of bending space. In each case the specific variety of nothing depends on what sort of something physicists intend to describe. “Sometimes, it’s the way we define a theory,” said Patrick Draper, a theoretical physicist at the University of Illinois.
As modern physicists have grappled with more sophisticated candidates for the ultimate theory of nature, they have encountered a growing multitude of types of nothing. Each has its own behavior, as if it’s a different phase of a substance. Increasingly, it seems that the key to understanding the origin and fate of the universe may be a careful accounting of these proliferating varieties of absence.
Posted in cosmology, mathematics, open access, physics
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Physicists have many theories for the beginning of our universe: A big bang, a big bounce, a black hole, a network, a collision of membranes, a gas of strings, and the list goes on. What does this mean? It means we don’t know how the universe began. And the reason isn’t just that we’re lacking data, the reason is that science is reaching its limits when we try to understand the initial condition of the entire universe.
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The Poplawski paper about how the universe might have been born from a black hole is here: https://link.springer.com/article/10.1007/s10714-021-02790-7
Orbiting around 420 kilometers (261 miles) above our heads, the astronauts of the Internation Space Station (ISS) get a view of Earth like no other. Sometimes, it’s spectacular auroras, other times it’s something more… curious.
European Space Agency (ESA) astronaut Samantha Cristoforetti – no stranger to having a bit of fun in space – took to Twitter yesterday to share what she called an “intriguing sight”, a bright dot apparently shining in the Negev desert in southern Israel. Related StoriesAfter 175 Years, Two False Conjectures, And The Birth Of Computing, This Theorem Finally Has A ProofExperiment To Find Elusive “Chameleon” Fifth Force Suggests It Doesn’t Actually ExistPerseverance Samples Hold Key To Understanding Water-Rich Martian Past.
Finally, there’s the issue that black holes can destroy information. Once you have crossed the event horizon, it seems you’d need to move faster than light to get back out. But a non-local connection across the horizon would also get information out. Some physicists have even suggested that dark matter, a hypothetical type of matter that supposedly makes up 85% of matter in the universe, is really a misattribution. There may be only normal matter, it’s just that its gravitational attraction is multiplied and spread out because places are non-locally connected to each other.
A non-locally connected universe, hence, would make sense for many reasons. If these speculations are correct, the universe might be full with tiny portals that connect seemingly distant places. The physicists Fotini Markopoulou and Lee Smolin estimated that our universe could contain as much as 10,360 of such non-local connections. And since the connections are non-local anyway, it doesn’t matter that they expand with the universe. The human brain, for comparison, has a measly 1015connections.
Let me be clear that there is absolutely zero evidence that non-local connections exist, or that, if they existed, they’d indeed allow the universe to think. But we cannot rule this possibility out either. Crazy as it sounds, the idea that the universe is intelligent is compatible with all we know so far.
Could one of the biggest puzzles in astrophysics be solved by reworking Albert Einstein’s theory of gravity? A new study co-authored by NASA scientists says not yet.
University of Birmingham researchers have demonstrated how unique vibrations, which are caused by interactions between the two stars’ tidal fields as they approach each other, affect gravitational-wave observations.
Taking these movements into account could significantly improve our understanding of the data collected by the Advanced LIGO and Virgo instruments, according to a press release published on the institute’s official website on Thursday.
“Scientists are now able to get lots of crucial information about neutron stars from the latest gravitational wave detections,” said Dr. Geraint Pratten of the University of Birmingham’s Institute for Gravitational Wave Astronomy. “Details such as the relationship between the star’s mass and its radius, for example, provide crucial insight into fundamental physics behind neutron stars.”
For the first time, scientists have confirmed a major breakthrough in nuclear fusion involving the first successful instance of ignition, the point at which a nuclear fusion reaction becomes self-sustaining.
The achievement, results for which have been published in three peer-reviewed papers, occurred at Lawrence Livermore National Laboratory’s (LLNL) National Ignition Facility on August 8, 2021.
Nuclear fusion involves a reaction where at least two atomic nuclei possessing a low atomic number fuse together, forming heavier atomic nuclei. During such a reaction, differences between the masses of the reactants and products result from the difference in energy that binds atomic nuclei before and after the reaction occurs. This difference will either cause the absorption or the release of energy.
The word ‘universe’ once described everything that exists. But as our horizons have expanded, many scientists have begun to consider what’s beyond our own cosmos, and…
