Black holes really are holes - objects without a surface - say Drs Christine Done and Marek Gierlinski in a paper accepted for publication in the Monthly Notices of the Royal Astronomical Society. Having an "event horizon" rather than a surface is the property that makes something a black hole but, by definition, its impossible ever to see one directly. However, these new results give direct evidence of the existence of such holes in spacetime.
Drs Done and Gierlinski set out to track down the signatures of event horizons by looking for differences between objects thought to be black holes and collapsed bodies of a different kind that are only slightly less extreme - neutron stars. Any material captured by the strong gravity of either type of object will spiral inwards in much the same way, reaching speeds of up to half the speed of light and transforming some of the immense gravitational energy into X-ray emission. The crucial difference is that, in the case of a black hole, material should simply pour into the hole, taking its remaining energy with it and disappearing forever, whereas with a neutron star material smashes onto the surface, releasing whatever energy is left. As a consequence, the X-ray emissions from neutron stars and black holes should look different.
"The idea is simple in theory, and has been known for a long time, but until now it has been hard to put into practice because the X-ray emission even from a single type of object can show a bewildering variety of properties that are not well understood," says Chris Done.
Dr Chris Done | alfa
Scientists discover particles similar to Majorana fermions
25.10.2016 | Chinese Academy of Sciences Headquarters
Light-driven atomic rotations excite magnetic waves
24.10.2016 | Max-Planck-Institut für Struktur und Dynamik der Materie
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
25.10.2016 | Earth Sciences
25.10.2016 | Power and Electrical Engineering
25.10.2016 | Process Engineering