Scientists have found a way to achieve negative refraction, using carefully arranged atomic arrays instead of engineered metamaterials. VERY GOOD!
Ask the researchers: Do you understand the spacetime background of atomic arrays interactions?
Scientific research guided by correct theories can enable researchers to think more.
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Hello and welcome! My name is Anton and in this video, we will talk about the discovery of the most massive superstructure in the nearby universe — Quipu.
https://arxiv.org/abs/2501.19236
Bohringer et al., Astronomy and Astrophysics, 2025
https://en.wikipedia.org/wiki/Sachs%E2%80%93Wolfe_effect.
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How does a star’s activity influence exoplanet data obtained by scientists? This is what a recent study published in The Astrophysical Journal Supplement Series hopes to address as a team of researchers at University College London (UCL) investigated how stellar activity, specifically star spots, could be “contaminating” exoplanet data, specifically exoplanet atmospheric data. This study has the potential to help astronomers develop more efficient methods for studying exoplanets and their atmospheres, specifically with the number of confirmed exoplanets increasing regularly.
For the study, the researchers used NASA’s Hubble Space Telescope to analyze data from 20 gas giant exoplanets ranging in size between Neptune-like and hot-Jupiter that transited their respective parent stars. To obtain a more complete dataset, the team observed the exoplanets from optical to near-infrared wavelengths. In the end, they discovered a broad range of “stellar contamination”, meaning stellar activity was influencing the exoplanet data, specifically regarding the atmospheric compositions and temperatures. For example, the results indicated that the number of specific molecules had errors as high as 6 orders of magnitude while temperatures had errors as high as 145 percent.
“Hotter, brighter regions (faculae) emit more light and so, for instance, if a planet passes in front of the hottest part of the star, this might lead researchers to over-estimate how large the planet is, as it will seem to block out more of the star’s light, or they might infer the planet is hotter than it is or has a denser atmosphere. The reverse is true if the planet passes in front of a cold starspot, making the planet appear ‘smaller’,” said Alexandra (Alex) Thompson, who is a PhD student in UCL’s Department of Physics & Astronomy and a co-author on the study.
A study published in the Journal of Cosmology and Astroparticle Physics (JCAP) presents a methodology to test the assumption of cosmic homogeneity and isotropy, known as the Cosmological Principle, by leveraging weak gravitational lensing—a light distortion effect described by general relativity—in astronomical images collected by new observatories such as the Euclid Space Telescope. Finding evidence of anomalies in the Cosmological Principle could have profound implications for our current understanding of the universe.
“The Cosmological Principle is like an ultimate kind of statement of humility,” explains James Adam, astrophysicist at the University of the Western Cape, Cape Town, South Africa, and lead author of the new paper. According to the Cosmological Principle, not only are we not at the center of the universe, but a true center does not exist.
A further assumption, similar to but distinct and independent from homogeneity, is that the universe is also isotropic, meaning it has no preferred directions. These assumptions underlie the Standard Model of Cosmology, the theoretical framework used to explain the origin, evolution, and current state of the universe. It is currently the most robust and consistent model, verified by numerous scientific observations, though not yet perfect.
Researchers at the University of Houston’s Texas Center for Superconductivity have achieved another first in their quest toward ambient-pressure high-temperature superconductivity, bringing us one step closer to finding superconductors that work in everyday conditions—and potentially unlocking a new era of energy-efficient technologies.
In their study titled “Creation, stabilization, and investigation at ambient pressure of pressure-induced superconductivity in Bi0.5 Sb1.5 Te3,” published in the Proceedings of the National Academy of Sciences, professors Liangzi Deng and Paul Ching-Wu Chu of the UH Department of Physics set out to see if they could push Bi0.5 Sb1.5 Te3 (BST) into a superconducting state under pressure—without altering its chemistry or structure.
“In 2001, scientists suspected that applying high pressure to BST changed its Fermi surface topology, leading to improved thermoelectric performance,” Deng said. “That connection between pressure, topology and superconductivity piqued our interest.”
The simulation hypothesis suggests that our entire universe and reality could just be hyper-enhanced reality illusions.
He believes recent developments in the field of information physics ‘appear to support this possibility’ in that the physical world is made up of bits of information.
Vopson goes even further by claiming that information might have physical weight and could be a key part of the universe.
