Black holes are vacuum solutions of the Einstein equation. Hence, the energy-momentum tensor for a black hole is null at every point of space. The only place where its mass can be located is where there is no space, i.e., at the singularity. Hence, for a Schwarzschild black hole, the mass is located at the […]
Condensed matter • Materials • Nanotechnology • Quantum physics • Theoretical physics
Controlling electron waves by harnessing phase-coherence and interference effects is a cornerstone for future nanoelectronics or quantum computing. To this end, design of platforms with well-defined, narrow, and low-loss propagation channels is essential. Nanoporous graphene (NPG) holds great potential for distributing and controlling currents on the nanoscale. But the effects derived from the wave nature […]
The division of past and future In Part 1 of this series, we presented the empirical fact that under extreme circumstances, a certain observer’s past can be in another observer’s future. To explain this, we introduced the network of cause and consequence relations as the fixed background structure of reality. This network constitutes Spacetime. Causality […]
Chemistry • Condensed matter • Materials • Nanotechnology • Quantum physics
Every year the amount of data produced is of the order of magnitude of the Avogadro’s constant, thus 6.028×1023. This trend is supposed to increase even more in the next future. This implies that more and more special metals will be needed. The point is: what might happen if the resources used for manufacturing common […]
Wildfires are a major problem with a strong impact on human life, property and the environment, Global warming and a legacy of poor management are the forces behind the increase in their occurrence and in their magnitude measured in extension. In 2017, an unusual number of extensive and severe wildfires occurred in many parts of […]
The needs imposed by a globalized society that maintains activity 24 hours a day and 7 days a week are being addressed by increasing working hours and extending work activity into the weekend. Karoshi, which can be translated literally as “overwork death” in Japanese, is occupational sudden mortality. In Asian countries, the risk of karoshi […]
One of the ultimate goals in surface science is to comprehend the fundamental processes that make that surface reactions need less than a picosecond (10-12 s) to occur. This means understanding what is happening at the scale of femtoseconds, that is, measuring things that take some tens or hundreds of 10-15 seconds to occur. To […]
Chemo-resistance remains a leading cause of mortality in cancer. Two recent discoveries demonstrate that some bacteria strains induce chemo-resistance, and can be targeted to increase the efficacy of therapeutic agents. The emerging relationship between the microorganisms and tumor progression has led many research groups to investigate whether the existence of a particular pattern of bacteria […]
Topological materials have special universal properties, which are protected against perturbations. Such properties are theoretically described by topology, a branch of mathematics concerned with the properties of geometrical objects that are unchanged by continuous deformations. Topological materials behave like an ordinary insulator in the bulk but have conducting states on their boundaries, i.e., edges or […]
Health • Microbiology • Neurobiology • Neuroscience • Physiology
Gut microbiota has a surprising importance in processes related to the development of the nervous system, its functioning and to psychology and behavior, both in people and in animals. The microorganisms produce substances that after crossing the intestinal epithelium reach the blood and through it and after crossing the blood-brain barrier they reach the brain […]