The planet Earth will die – if not before, then when the Sun collapses. This is going to happen in approximately seven billion years. In the universe however the death of suns and planets is an everyday occurance and our solar system partly consists of their remnants.
The end of stars – suns – rich in mass is often a neutron star. These “stars' liches“ demonstrate a high density, in which atoms are extremely compressed. Such neutron stars are no bigger than a small town, but heavier than our sun, as physicist PD Dr. Axel Maas of the Jena University (Germany) points out. He adds: “The atomic nuclei are very densely packed.“ Compared to atoms, like water, the nuclei of neutron stars are as tightly packed as a bus with 1.000 passengers crowded together in comparison to a bus with only the driver on board. In these densely packed atomic nuclei, so-called “nuclear forces“ are at work. They keep the neutron star together and are responsible for its “eternal life“ – and for the last 35 years the strong nuclear interactions were amongst the greatest challenges of theoretical physics.
Together with colleagues from the Universities of Jena and Darmstadt (both Germany) Axel Maas has succeeded in simulating the strong atomic nuclear interactions to enable its calculability while at the same time preserving the typical characteristics of a neutron star. “It is the first theory for such a tight package,“ the Jena Physicist says. Previously simulations trying to specify the matter inside of neutron stars collapsed far too much in size and yielded the wrong properties time and again – even on the most powerful computers. “These simulations didn't work because there are too many atomic nuclei,“ Maas explains the problem, whose solution the world of physics has come closer to due to the calculations of the Jena researchers. To get there, the scientists did so many calculations at the Loewe Center for Science Computing (CSC) in Frankfurt, that it would have taken a single PC approximately 2.500 years to do the same.
“We weren't able to solve the initial problem either,“ Axel Maas concedes, as algorithms are not (yet) powerful enough. However, the Jena physicist who had been researching this problem since 2007 and his colleagues “reached a new level of quality“. They found a “modification of the theory for such a tight package“, Maas says. And thus they enabled nuclear material to be simulated. Most characteristics of the neutron star are being preserved with the Jena method, but now they enabled its calculability.The team accomplished this big step forward by intelligently modifying the nuclear forces and by solving the stacking problem of the atoms. That they were at the same time ’cheating a bit‘, the physicists freely admit. However, Maas firmly believes: “We found the best possible shortcut“. Now they know “what is relevant for the original simulation“.
'Frequency combs' ID chemicals within the mid-infrared spectral region
16.03.2018 | American Institute of Physics
Fraunhofer HHI have developed a novel single-polarization Kramers-Kronig receiver scheme
16.03.2018 | Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, HHI
Animal photoreceptors capture light with photopigments. Researchers from the University of Göttingen have now discovered that these photopigments fulfill an...
On 15 March, the AWI research aeroplane Polar 5 will depart for Greenland. Concentrating on the furthest northeast region of the island, an international team...
The world’s second-largest ice shelf was the destination for a Polarstern expedition that ended in Punta Arenas, Chile on 14th March 2018. Oceanographers from...
At the 2018 ILA Berlin Air Show from April 25–29, the Fraunhofer Institute for Laser Technology ILT is showcasing extreme high-speed Laser Material Deposition (EHLA): A video documents how for metal components that are highly loaded, EHLA has already proved itself as an alternative to hard chrome plating, which is now allowed only under special conditions.
When the EU restricted the use of hexavalent chromium compounds to special applications requiring authorization, the move prompted a rethink in the surface...
At the ILA Berlin, hall 4, booth 202, Fraunhofer FHR will present two radar sensors for navigation support of drones. The sensors are valuable components in the implementation of autonomous flying drones: they function as obstacle detectors to prevent collisions. Radar sensors also operate reliably in restricted visibility, e.g. in foggy or dusty conditions. Due to their ability to measure distances with high precision, the radar sensors can also be used as altimeters when other sources of information such as barometers or GPS are not available or cannot operate optimally.
Drones play an increasingly important role in the area of logistics and services. Well-known logistic companies place great hope in these compact, aerial...
16.03.2018 | Event News
13.03.2018 | Event News
08.03.2018 | Event News
16.03.2018 | Earth Sciences
16.03.2018 | Physics and Astronomy
16.03.2018 | Life Sciences