Pulsars with black holes can save the ‘holy grail’
Dec 10, 2014 12:10:33 GMT
sigurdur, scpg02, and 1 more like this
Post by bigbadwolf on Dec 10, 2014 12:10:33 GMT
8th of December by Tara D.
The flashing light emitted by pulsars, the most accurate clocks in the universe, scientists used to verify the theory of relativity Einstein, especially when these objects are paired with another neutron star or a white dwarf and interferes severity. But this theory could look much better if a pulsar with a black, except hole in two specific cases are found, researchers report Spain and India. Pulsars are superdense neutron star the size of a city-its radius round dozen miles-which, like beacons in the universe emit powerful beams of gamma or X radiation when rotated up to hundreds of times per second. These features make them ideal to test the validity of the general theory of relativity, Einstein published between 1915 and 1916.
These deviations may occur if the pulsar near a massive object is, as another neutron star or a white dwarf stellar remnant that remains when stars like our Sun exhaust their nuclear fuel. Compounds binary pulsar systems and a neutron star (including the pulsar pulsar-systems) or with a white dwarf has been used very successfully to verify the theory of gravity.
Last year the rare presence of a -called press SGR J1745-2900- in the vicinity of a supermassive black hole (Sgr A *, millions of solar masses) was also detected, but a combination that has not yet been discovered: orbiting the pulsar ‘normal’ black hole, ie, with a similar mass of stars.
Until now, scientists thought this odd couple as a true holy grail to examine gravity, but there are at least two cases where the other pairings can be more effective. So says the study that Torres and physical Manjari Bagchi, the International Centre for Theoretical Sciences (India) and now a postdoc at the IEEC-CSIC, published in the Journal of Cosmology and Astroparticle Physics. The work has also received an honorable mention in the Essays of Gravitation 2014 award.
The first case is when the so-called strong equivalence principle is violated. This principle of the theory of relativity states that the gravitational motion of a body that we test depends only on its position in space-time and not what is established, implying that the outcome of any experiment in a laboratory free fall is independent of the speed at which the lab and go where you are in space-time.
The other possibility is if a possible variation of the gravitational constant arises, that determines the intensity of the gravitational pull between the bodies. Its value is G = 6.67384 (80) x 10 -11 N m 2 / kg 2 . Despite being a constant, is one that is known less accurately, with only an accuracy of one part in 10,000.
In these two specific cases, the combination pulsar-black hole would be the perfect holy grail, but in any case the scientists are eager to find this couple, because they could be used to analyze the most deviations. In fact, it is one of the objectives pursued by space telescopes such as X-rays and gamma Chandra, NuSTAR or Swift, and the large radio telescopes being built today, as the huge Square Kilometre Array (SKA) in Australia and South Africa.
www.betawired.com/pulsars-with-black-holes-can-save-the-holy-grail-of-gravity/1421224/
www.scienceclarified.com/Mu-Oi/Neutron-Star.html
www.khaleejtimes.com/kt-article-display-1.asp?section=editorschoice&xfile=/data/editorschoice/2014/December/editorschoice_December7.xml
The flashing light emitted by pulsars, the most accurate clocks in the universe, scientists used to verify the theory of relativity Einstein, especially when these objects are paired with another neutron star or a white dwarf and interferes severity. But this theory could look much better if a pulsar with a black, except hole in two specific cases are found, researchers report Spain and India. Pulsars are superdense neutron star the size of a city-its radius round dozen miles-which, like beacons in the universe emit powerful beams of gamma or X radiation when rotated up to hundreds of times per second. These features make them ideal to test the validity of the general theory of relativity, Einstein published between 1915 and 1916.
These deviations may occur if the pulsar near a massive object is, as another neutron star or a white dwarf stellar remnant that remains when stars like our Sun exhaust their nuclear fuel. Compounds binary pulsar systems and a neutron star (including the pulsar pulsar-systems) or with a white dwarf has been used very successfully to verify the theory of gravity.
Last year the rare presence of a -called press SGR J1745-2900- in the vicinity of a supermassive black hole (Sgr A *, millions of solar masses) was also detected, but a combination that has not yet been discovered: orbiting the pulsar ‘normal’ black hole, ie, with a similar mass of stars.
Until now, scientists thought this odd couple as a true holy grail to examine gravity, but there are at least two cases where the other pairings can be more effective. So says the study that Torres and physical Manjari Bagchi, the International Centre for Theoretical Sciences (India) and now a postdoc at the IEEC-CSIC, published in the Journal of Cosmology and Astroparticle Physics. The work has also received an honorable mention in the Essays of Gravitation 2014 award.
The first case is when the so-called strong equivalence principle is violated. This principle of the theory of relativity states that the gravitational motion of a body that we test depends only on its position in space-time and not what is established, implying that the outcome of any experiment in a laboratory free fall is independent of the speed at which the lab and go where you are in space-time.
The other possibility is if a possible variation of the gravitational constant arises, that determines the intensity of the gravitational pull between the bodies. Its value is G = 6.67384 (80) x 10 -11 N m 2 / kg 2 . Despite being a constant, is one that is known less accurately, with only an accuracy of one part in 10,000.
In these two specific cases, the combination pulsar-black hole would be the perfect holy grail, but in any case the scientists are eager to find this couple, because they could be used to analyze the most deviations. In fact, it is one of the objectives pursued by space telescopes such as X-rays and gamma Chandra, NuSTAR or Swift, and the large radio telescopes being built today, as the huge Square Kilometre Array (SKA) in Australia and South Africa.
www.betawired.com/pulsars-with-black-holes-can-save-the-holy-grail-of-gravity/1421224/
www.scienceclarified.com/Mu-Oi/Neutron-Star.html
www.khaleejtimes.com/kt-article-display-1.asp?section=editorschoice&xfile=/data/editorschoice/2014/December/editorschoice_December7.xml
