Archivo de etiquetas: física
Nuevo catálogo con decenas de nuevas ondas gravitacionales detectadas por Virgo y LIGO
Los detectores Virgo y LIGO de ondas gravitacionales registraron 39 eventos entre abril y octubre de 2019. Estas numerosas observaciones se corresponden con colisiones de agujeros negros o estrellas de neutrones y abren la puerta a nuevos estudios sobre poblaciones de objetos astrofísicos y de física fundamental.
The universe teems with weird black holes, gravitational-wave hunters find
Less than 5 years ago, physicists rocked the scientific world when they first spotted gravitational waves—fleeting ripples in space and time—set off when two gargantuan black holes billions of light-years away swirled into each other. Since then, scientists have detected a scad of similar events, mostly reported event by event. Today, however, researchers with a global network of gravitational wave detectors announced the first major statistical analyses of their data so far, 50 events in all. Posted online in four papers, the analyses show that black holes—ghostly ultraintense gravitational fields left behind when massive stars collapse—are both more common and stranger than expected. They also shed light on mysteries such as how such black holes pair up before merging.
Confirmado un nuevo fenómeno eléctrico en la atmósfera: destellos azules por descargas eléctricas frías
Con ayuda de un instrumento de la estación espacial internacional y sensores terrestres, investigadores del Instituto de Astrofísica de Andalucía han detectado por primera vez la emisión simultánea de destellos azules y pulsos de radio en nubes de tormenta. Estos raros eventos se producen por descargas eléctricas formadas por filamentos de plasma o aire ionizado que, en lugar de ser calientes como las de los rayos, son frías.
Quantum Time Twist Offers a Way to Create Schrödinger’s Clock
Physicists describe a way to merge quantum theory with Einstein’s special theory of relativity—and even a method to test it experimentally
Cryo–electron microscopy breaks the atomic resolution barrier at last
If you want to map the tiniest parts of a protein, you only have a few options: You can coax millions of individual protein molecules to align into crystals and analyze them using x-ray crystallography. Or you can flash-freeze copies of the protein and bombard them with electrons, a lower resolution method called cryo–electron microscopy (cryo-EM). Now, for the first time, scientists have sharpened cryo-EM’s resolution to the atomic level, allowing them to pinpoint the positions of individual atoms in a variety of proteins at a resolution that rivals x-ray crystallography’s.
Quantum Tunnels Show How Particles Can Break the Speed of Light
Recent experiments show that particles should be able to go faster than light when they quantum mechanically “tunnel” through walls.
Do We Live in a Simulation? Chances Are about 50–50
Gauging whether or not we dwell inside someone else’s computer may come down to advanced AI research—or measurements at the frontiers of cosmology
¿Hay universos en expansión dentro de los agujeros negros?
Se trataría de grotescas miniaturas de un universo en expansión, donde el espacio puede estirarse y deformarse a diferentes velocidades y en diferentes direcciones
A Physicist’s Approach to Biology Brings Ecological Insights
The physicist Jeff Gore tests theories about microbe communities experimentally and finds new rules governing ecological stability.