Astronomers have made a groundbreaking discovery that could completely change how we think about dark energy, the mysterious force responsible for accelerating the expansion of the universe. In a new set of findings from one of the most ambitious cosmic surveys ever conducted, dark energy appears to be evolving in ways previously unimagined.

Dark energy, which makes up about 70% of the universe’s total energy, remains one of the biggest enigmas in astrophysics. Despite its immense influence on the cosmos, scientists still don’t fully understand what it is or how it works. According to Mustapha Ishak-Boushaki, a professor of physics and astrophysics at the University of Texas at Dallas, “We have no idea exactly what dark energy is.”

Ishak-Boushaki is part of the Dark Energy Spectroscopic Instrument (DESI) collaboration, a project designed to observe and analyze the universe on a massive scale. DESI, now in its fourth year, has been mapping galaxies and gathering data to help unlock the secrets of dark energy.

DESI is revolutionizing our understanding of the universe. Using the National Science Foundation’s 4-meter telescope in Arizona, the instrument observes light from up to 5,000 galaxies at once. By the time the survey concludes next year, it will have mapped light from around 50 million galaxies—providing an unparalleled view of the universe over the last 11 billion years.

The latest release from DESI, shared on March 19, offers a treasure trove of data, including measurements from nearly 15 million galaxies and quasars. These new findings suggest that dark energy may not be the constant force astronomers once believed it to be. Instead, it appears to be changing—perhaps even weakening over time.

The concept of dark energy was first introduced nearly 30 years ago, and its discovery has since been one of the most shocking revelations in astrophysics. Now, new evidence is pointing toward the idea that dark energy evolves, potentially reshaping our understanding of how the universe works. As David Weinberg, an astronomer at The Ohio State University, puts it, “These new measurements offer the strongest evidence so far that dark energy evolves, which would be another mind-blowing change to our understanding of the universe.”

DESI’s incredible capabilities allow it to build one of the largest 3D maps of the universe. By measuring light from celestial objects at different points in time, DESI is revealing how dark energy has influenced the cosmos throughout history. It uses what’s called the baryon acoustic oscillation (BAO) scale—a standard ruler to measure distances in the universe—to track how the universe has expanded over billions of years.

John Moustakas, a professor at Siena College and co-lead of DESI’s data release, explains, “DESI is unlike any other machine in terms of its ability to observe independent objects simultaneously.”

The findings suggest that dark energy’s effect on the universe may not be as constant as scientists once thought. In fact, when combined with other measurements—from supernova explosions to the cosmic microwave background—DESI data shows that dark energy’s influence could be weakening over time.

If this trend continues, it could mean that dark energy will no longer be the dominant force driving the universe’s expansion. Instead, the expansion could slow down or even reverse. While this is a far-off possibility, taking billions of years, Ishak-Boushaki notes, “If the evidence continues to grow, and it is likely to, this will be huge for cosmology and all of physics.”

While it’s too early to definitively conclude that dark energy is evolving, the data is compelling. Ishak-Boushaki and his colleagues are excited to see how future measurements may help confirm or challenge these findings. Paul Martini, a coordinator of the analysis, adds, “If the evidence becomes overwhelming, our next questions will be: How does dark energy evolve? And what are the physical explanations for it?”

The collaboration is already preparing for the next phase of research, with new experiments like Spec-S5, which will study over 10 times as many galaxies as DESI. These projects, along with upcoming missions like the Euclid and Nancy Grace Roman Space Telescopes, promise to give scientists even more tools to explore dark energy and the universe’s expansion.

What does all this mean for our understanding of the universe? If dark energy is indeed evolving, it could upend current models of cosmology. Jason Rhodes, a cosmologist at NASA, suggests that this could indicate a need for a more complex model of dark energy—one that accounts for its changing nature over time.

As scientists continue to push the boundaries of our knowledge, Ishak-Boushaki reflects on the significance of the work: “Whatever the nature of dark energy is, it will shape the future of our universe.” The answers may still be out of reach, but the quest to understand dark energy is leading us closer to answering some of the biggest questions humanity has ever asked.

Source: CNN – ‘Another mind-blowing change’: New data suggests mysterious dark energy is evolving

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Deep beneath a granite hill in southern China, a groundbreaking project is nearing completion. The Jiangmen Underground Neutrino Observatory (JUNO) is set to begin its mission to uncover the mysteries of neutrinos, tiny yet powerful cosmic particles that have baffled scientists for decades.

As one of three global neutrino detectors, JUNO will offer the most detailed insights into these “ghost particles” yet. While its counterparts in the United States and Japan are still under construction, JUNO is set to begin operations next year, pushing the boundaries of our understanding of the universe.

What Are Neutrinos?

Neutrinos are among the most elusive particles known to science. They were created in the Big Bang and have been streaming through space—and through us—ever since. Trillions of these particles pass through our bodies every second, emitted by the sun, stars, and even nuclear power plants.

Although neutrinos have been known to science for nearly a century, their true nature remains one of the greatest mysteries in particle physics. “It’s the least understood particle in our world,” says Cao Jun, a project manager for the JUNO detector. This is why studying them is so crucial.

Why Are Neutrinos So Hard to Detect?

Neutrinos interact so weakly with matter that they pass through most substances without leaving a trace. To detect them, scientists rely on what happens when neutrinos collide with other particles, causing flashes of light or charged particles. However, these interactions are rare, so researchers need large-scale detectors to increase the likelihood of capturing them.

As Andre de Gouvea, a theoretical physicist at Northwestern University, explains, “The solution for how we measure these neutrinos is to build very, very big detectors.”

A Giant Detector to Catch Tiny Particles

The JUNO detector, located in Kaiping, China, is one of the largest and most sophisticated neutrino detectors ever constructed. At a cost of $300 million, the project took over nine years to complete. Situated 2,297 feet (700 meters) underground, the location shields the detector from cosmic rays and other interference that could disrupt its delicate measurements.

Workers recently reached a key milestone, beginning the final phase of construction. The spherical detector will be filled with a special liquid that emits light when neutrinos pass through it. This will allow scientists to track and study the particles in unprecedented detail. The entire setup will be submerged in purified water to further reduce noise from background radiation.

Studying Antineutrinos to Unlock New Insights

JUNO will focus on antineutrinos, the opposite of neutrinos, which are produced by two nuclear power plants located over 31 miles (50 kilometers) away. When antineutrinos interact with particles inside the detector, they generate flashes of light, which can then be studied to learn more about their behavior. This will help scientists understand one of the biggest questions in neutrino research: how do neutrinos change between three distinct “flavors” as they travel through space?

Kate Scholberg, a physicist at Duke University, calls the project “a daring thing to even go after” because of the complexity of detecting these subtle shifts.

Looking Ahead: The Quest to Understand the Universe

JUNO is expected to begin operations in the second half of 2024. After that, it will take time to collect and analyze the data, but the potential breakthroughs are worth the wait. Scientists hope the results from JUNO will help answer fundamental questions about the universe’s origins and evolution.

Neutrinos hold the key to understanding the universe’s earliest moments. They are believed to have played a role in the imbalance between matter and antimatter that shaped the cosmos as we know it. As Wang Yifang, chief scientist of the JUNO project, puts it, “In the end, we have a better understanding of the nature of physics.”

In addition to JUNO, two other neutrino detectors—Japan’s Hyper-Kamiokande and the Deep Underground Neutrino Experiment (DUNE) in the United States—are under construction. These projects, scheduled to begin operations around 2027 and 2031, will complement JUNO’s findings and offer new perspectives on neutrino behavior.

By studying these mysterious particles, scientists hope to uncover secrets not only about how the universe formed, but also about the fundamental forces that govern everything from the smallest particles to the largest cosmic structures. Neutrinos may be tiny, but their impact on our understanding of the universe could be immense.

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Google has unveiled a groundbreaking quantum computing chip, named “Willow”, claiming it can solve complex problems in just five minutes—tasks that would take the world’s fastest supercomputers an astonishing 10 septillion years to complete. This development marks a significant step in the quest for ultra-powerful computing based on quantum mechanics.

What Makes Willow Revolutionary?

Google describes Willow as a chip that incorporates key breakthroughs in quantum computing and believes it is a milestone on the path to a functional, large-scale quantum computer. Hartmut Neven, head of Google’s Quantum AI lab and self-proclaimed “chief optimist,” expressed confidence that Willow would contribute to practical applications in the near future.

While still experimental, Willow is a glimpse into a future where quantum computers could revolutionize industries by simulating intricate systems and solving previously insurmountable problems.

How Quantum Computing Works

Quantum computers differ fundamentally from traditional ones. Instead of using bits (binary values of 0 or 1), they process data in qubits, which can exist in multiple states simultaneously. This ability, stemming from the bizarre nature of quantum mechanics, allows quantum computers to tackle calculations exponentially faster than conventional systems.

Key features of quantum particles include:

• Superposition: The ability to exist in two places or states at once.
• Entanglement: A mysterious connection between particles that persists even across vast distances.

Credits CNET: Google Quantum AI Reveals Willow Quantum Computing Chip

Potential Applications and Implications

Quantum computing holds immense promise for solving problems across various fields, such as:

• Healthcare: Accelerating drug discovery and understanding complex biological processes.
• Energy: Designing nuclear fusion reactors and improving battery technology.
• Security: Developing or breaking encryption systems.

However, this power also raises concerns. Quantum computers could potentially bypass modern encryption techniques, prompting companies like Apple to introduce “quantum-proof” encryption to protect sensitive data.

When Will Quantum Computing Become Practical?

Neven predicts that commercial-grade quantum computers capable of real-world applications won’t emerge until the end of the decade. Initial use cases are likely to involve simulations where quantum effects are crucial, such as pharmaceutical development, energy systems, and advanced materials research.

A Quantum Future Awaits

While Willow is not yet a universal solution, it represents a significant step toward the quantum era. The ability to simulate and solve real-world challenges using quantum mechanics could revolutionize science, industry, and technology.

Quantum computing is still years—and billions of dollars—away from full maturity, but Google’s new chip gives us a tantalizing glimpse of a future that could redefine what computers are capable of achieving.

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