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Probing the quantum nature of black holes through entropy

In a study published in Physical Review Letters, physicists have demonstrated that black holes satisfy the third law of thermodynamics, which states that entropy remains positive and vanishes at extremely low temperatures, just like ordinary quantum systems. The finding provides strong evidence that black holes possess isolated ground states, a hallmark of quantum mechanical behavior.

Understanding gravity’s quantum behavior is among the biggest open questions facing modern physics. Black holes are used as laboratories for investigating quantum gravity, particularly at low temperatures where quantum effects become visible.

Prior calculations showed that black hole entropy might become negative at low temperatures, a result that appeared physically puzzling. In this work, researchers addressed the paradox by incorporating wormhole effects in the two-dimensional Jackiw-Teitelboim (JT) gravity model.

Humans and artificial neural networks exhibit some similar patterns during learning

Past psychology and behavioral science studies have identified various ways in which people’s acquisition of new knowledge can be disrupted. One of these, known as interference, occurs when humans are learning new information and this makes it harder for them to correctly recall knowledge that they had acquired earlier.

Interestingly, a similar tendency was also observed in artificial neural networks (ANNs), computational models inspired by biological neurons and the connections between them. In ANNs, interference can manifest as so-called catastrophic forgetting, a process via which models “unlearn” specific skills or information after they are trained on a new task.

In some other instances, knowledge acquired in the past can instead help humans or ANNs to learn how to complete a new task. This phenomenon, known as “transfer,” entails the application of existing knowledge of skills to a novel task or problem.

Rapid X-ray pulses enable 100-fold efficiency boost for photoionization

Speed matters. When an X-ray photon excites an atom or ion, making a core electron jump onto a higher energy level, a short-lived window of opportunity opens. For just a few femtoseconds, before an electron fills the void in the lower energy level, a second photon has the chance to be absorbed by another core electron, creating a doubly excited state.

Using 5,000 intense X-ray flashes per second, generated by the European XFEL, an international team of scientists has investigated such double core-hole states in highly ionized krypton, using photons that all had nearly the same energy or color.

For their experiments, scientists from European XFEL and the Max Planck Institute for Nuclear Physics (MPIK) in Heidelberg as well as six other institutions across Germany, Italy, Portugal, and the United States, used highly charged krypton, Kr26+, lacking all but ten of its electrons.

Hepatitis D Virus Classified as Carcinogenic: Implications

The International Agency for Research on Cancer (IARC) of the World Health Organization has classified hepatitis D virus (HDV) as carcinogenic, citing sufficient evidence and placing it alongside hepatitis B virus (HBV) and hepatitis C virus (HCV) as a cause of hepatocellular carcinoma (HCC).

WHO’s classification of hepatitis D virus as carcinogenic raises urgent questions for vaccination, screening, and treatment strategies worldwide.

Why important genes ‘go quiet’ as we get older

The human gut renews itself faster than any other tissue: every few days, new cells are created from specialized stem cells. However, as we get older, epigenetic changes build up in these stem cells. These are chemical markers on the DNA that act like switches, determining which genes remain active.

The study, recently published in Nature Aging, was conducted by an international team led by Prof. Francesco Neri from the University of Turin, Italy, and shows that changes in the gut do not occur randomly. Rather, a specific pattern develops over the course of aging, which the researchers refer to as ACCA (Aging-and Colon Cancer-Associated) drift. “We observe an epigenetic pattern that becomes increasingly apparent with age,” explains Prof. Neri, former group leader at the Leibniz Institute on Aging—Fritz Lipmann Institute in Jena.

Genes that maintain the balance in healthy tissue are particularly affected, including those that control the renewal of the intestinal epithelium via the Wnt signaling pathway. The changes described as “drifting” can be detected not only in the aging gut, but also in almost all colon cancer samples examined. This suggests that the aging of stem cells creates an environment that promotes the development of cancer.

Italian mission adds to growing IRIDE space fleet

The Italian programme IRIDE, which provides public sector services based on data from its fleet of Earth observation constellations, has added eight satellites to its second constellation, Eaglet II.

The Eaglet II satellites lifted off on board a Falcon 9 rocket at 19:44 CET (10:44 local time), 28 November, from Vandenberg Space Force Base in California, US. All satellites were placed into orbit about one hour after launch. Acquisition of signal for all satellites was confirmed several hours later by OHB’s Mission Control Centre in Rome.

The launch was a rideshare carrying numerous other satellites into orbit, including HydroGNSS (ESA’s first Scout mission under its FutureEO programme) and two ICEYE satellites for Greece.

Scientists Restore Aging Blood Stem Cells to a More Youthful State in Mice

Deep within your bone marrow, a specialized set of stem cells is busy pumping out new blood cells to sustain your body. As we age, these hematopoietic stem cells (or HSCs) become less productive, affecting our immune system and increasing our risk of conditions like anemia and cancer.

Now, scientists have found a way to rewind the clock in aging HSCs, which could potentially help to treat age-related blood and immune deficiencies.

Like most of our cells, HSCs contain tiny compartments known as lysosomes. These are the cells’ recycling centers, where complex molecules like proteins and lipids are sent to be broken down into smaller, reusable parts.

Scientists Claim to Detect Dark Matter for the First Time Ever

A team of astronomers say they may have detected dark matter, the invisible substance thought to make up over 85 percent of all matter in the universe, for the first time in history.

The claim is controversial, and the findings, published in a new study in the Journal of Cosmology and Astroparticle Physics, will need to be borne out by further observations. But at least until it gets picked apart by other physicists, it’s one of the most exciting developments in the hunt for this omnipresent specter haunting the cosmos.

“This could be a crucial breakthrough in unraveling the nature of dark matter,” study author Tomonori Totani, an astronomer at the University of Tokyo, told The Guardian.

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