Tag: physics

Einstein’s General Relativity with a Twist: Teleparallelism

It might not be obvious to those of us only grappling with more mundane concerns, but for cosmologists bent on unlocking the universe’s deepest secrets, there’s no shortage of problems keeping them up at night. “Dark matter” is the shorthand explanation for stars and galaxies moving much more quickly than the gravity of their luminous matter should allow. Let’s not forget “dark energy,” too—the preferred solution to the mystery of the universe expanding faster than anyone expected and doing so at an accelerated rate. Meanwhile a hypothesized “evolving” form of dark energy might resolve something called the Hubble tension—the term used for a major disagreement among researchers about the present-day cosmic expansion rate.

Cosmologists have been losing sleep over such quandaries for generations, wondering what missing ingredients they need to add to their models to fix what seem to be glaring gaps in their understanding. But what if the answer to some—maybe even all—of these problems isn’t a radical new theory but rather an old one, devised almost a century ago by none other than Albert Einstein himself? It’s called teleparallel gravity, and according to a loose collection of theorists who study it, this theory deserves a closer look by the wider scientific community.

Dark matter, dark energy, the Hubble tension: underpinning these theories is Einstein’s general theory of relativity, which treats space and time as a unified “spacetime” and considers gravity as spacetime’s curvature. Perhaps, then, the answer is to modify, change or update relativity itself to gain a new understanding of gravity rather than hypothesizing mysterious dark substances and forces. But across the decades, theorists pursuing this general approach have delivered mixed results at best.

The best example may be Modified Newtonian Dynamics (MOND), an effort to banish dark matter that, according to some research, still has to allow for the existence of some dark matter. A more recent addition, dubbed “timescape” cosmology, seeks to account for dark energy by asserting that gigantic, matter-sparse “voids” in the cosmos are much larger than most other measurements say they can be. None of these possible solutions come without their own problems.

So if these new ideas aren’t working out, why not return to the old master? In 1928, about a decade after completing his greatest scientific achievement, general relativity, Einstein began work on an alternative form of this cherished idea. His dream was to find a single set of equations that could describe both gravity and electromagnetism. His idol James Clerk Maxwell achieved such a feat in the early 1860s, using a single set of equations to describe electricity, magnetism and radiation, and Einstein hoped to follow in Maxwell’s footsteps.

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NASA VETERAN’S PROPELLANTLESS PROPULSION DRIVE THAT PHYSICS SAYS SHOULDN’T WORK JUST PRODUCED ENOUGH THRUST TO OVERCOME EARTH’S GRAVITY

Dr. Charles Buhler, a NASA engineer and the co-founder of Exodus Propulsion Technologies, has revealed that his company’s propellantless propulsion drive, which appears to defy the known laws of physics, has produced enough thrust to counteract Earth’s gravity.

A veteran of such storied programs as NASA’s Space Shuttle, the International Space Station (ISS), The Hubble Telescope, and the current NASA Dust Program, Buhler and his colleagues believe their discovery of a fundamental new force represents a historic breakthrough that will impact space travel for the next millennium.

“The most important message to convey to the public is that a major discovery occurred,” Buhler told The Debrief. “This discovery of a New Force is fundamental in that electric fields alone can generate a sustainable force onto an object and allow center-of-mass translation of said object without expelling mass.”

“There are rules that include conservation of energy, but if done correctly, one can generate forces unlike anything humankind has done before,” Buhler added. “It will be this force that we will use to propel objects for the next 1,000 years… until the next thing comes.”

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Research group detects a quantum entanglement wave for the first time using real-space measurements

Triplons are tricky little things. Experimentally, they’re exceedingly difficult to observe. And even then, researchers usually conduct the tests on macroscopic materials, in which measurements are expressed as an average across the whole sample.

That’s where designer quantum materials offer a unique advantage, says Academy Research Fellow Robert Drost, the first author of a paper published in Physical Review Letters. These designer quantum materials let researchers create phenomena not found in natural compounds, ultimately enabling the realization of exotic quantum excitations.

“These materials are very complex. They give you very exciting physics, but the most exotic ones are also challenging to find and study. So, we are trying a different approach here by building an artificial material using individual components,” says Professor Peter Liljeroth, head of the Atomic Scale physics research group at Aalto University.

Quantum materials are governed by the interactions between electrons at the microscopic level. These electronic correlations lead to unusual phenomena like high-temperature superconductivity or complex magnetic states, and quantum correlations give rise to new electronic states.

In the case of two electrons, there are two entangled states known as singlet and triplet states. Supplying energy to the electron system can excite it from the singlet to the triplet state. In some cases, this excitation can propagate through a material in an entanglement wave known as a triplon. These excitations are not present in conventional magnetic materials, and measuring them has remained an open challenge in quantum materials.

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Scientist Suggests Feasibility of Faster-Than-Light Travel within the Boundaries of Einstein’s Physics

The idea of faster-than-light (FTL) travel has captivated human imagination for decades, fueled by science fiction’s portrayal of interstellar journeys that traverse the vast cosmos in the blink of an eye. While the concept has long been considered implausible due to Albert Einstein’s theory of relativity, recent claims by a daring scientist suggest that FTL travel might not be as far-fetched as previously thought. This potential breakthrough could revolutionize our understanding of the universe and reshape the boundaries of human exploration.

Einstein’s Relativity and the Cosmic Speed Limit

Albert Einstein’s theories of special and general relativity are pillars of modern physics, setting forth the framework for understanding the fundamental behavior of space, time, and gravity. One of the most renowned consequences of these theories is the assertion that the speed of light is the ultimate cosmic speed limit – nothing can travel faster than light in a vacuum. This assertion has not only been supported by countless experiments but has also been instrumental in shaping our understanding of the universe.

The Challenge of Faster-Than-Light Travel

The idea of FTL travel, while popular in science fiction, has been met with skepticism by the scientific community. The energy required to propel an object to or beyond the speed of light using conventional methods seems insurmountable, and the associated implications, including time dilation and causality violations, challenge the very fabric of reality as we know it.

However, recent developments in theoretical physics have sparked new discussions about the feasibility of FTL travel within the framework of Einstein’s theories. Dr. Amelia Rodriguez, a theoretical physicist at the forefront of this debate, claims that there might be loopholes in Einstein’s equations that could potentially allow for FTL travel without violating the laws of physics.

Warp Drives and Alcubierre’s Theory

Dr. Rodriguez’s work draws inspiration from Miguel Alcubierre’s “warp drive” concept proposed in the 1990s. Alcubierre’s theory involves the creation of a “warp bubble” around a spacecraft, effectively contracting space in front of it and expanding space behind it. This manipulation of spacetime would allow the spacecraft to “ride” on the wave created by the bubble, potentially enabling speeds faster than light without the spacecraft itself exceeding the speed of light within its local frame of reference.

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Physicists Have Broken The Speed of Light With Pulses Inside Hot Plasma

Sailing through the smooth waters of vacuum, a photon of light moves at around 300 thousand kilometers (186 thousand miles) a second. This sets a firm limit on how quickly a whisper of information can travel anywhere in the Universe.

While this law isn’t likely to ever be broken, there are features of light which don’t play by the same rules. Manipulating them won’t hasten our ability to travel to the stars, but they could help us clear the way to a whole new class of laser technology.

Physicists have been playing hard and fast with the speed limit of light pulses for a while, speeding them up and even slowing them to a virtual stand-still using various materials like cold atomic gases, refractive crystals, and optical fibers.

This time, researchers from Lawrence Livermore National Laboratory in California and the University of Rochester in New York have managed it inside hot swarms of charged particles, fine-tuning the speed of light waves within plasma to anywhere from around one-tenth of light’s usual vacuum speed to more than 30 percent faster.

This is both more – and less – impressive than it sounds.

To break the hearts of those hoping it’ll fly us to Proxima Centauri and back in time for tea, this superluminal travel is well within the laws of physics. Sorry.

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