scholarly journals Probing noncommutative gravity with gravitational wave and binary pulsar observations

2020 ◽  
Vol 102 (8) ◽  
Author(s):  
Leah Jenks ◽  
Kent Yagi ◽  
Stephon Alexander
Keyword(s):  
Gravitational Wave ◽  
Binary Pulsar ◽  
Noncommutative Gravity

The Discovery of Gravitational Wave Emission

2018 ◽  
pp. 103-105
Author(s):  
Alvaro De Rújula
Keyword(s):  
General Relativity ◽  
Neutron Stars ◽  
Gravitational Wave ◽  
Binary Stars ◽  
Binary Pulsar ◽  
Wave Emission

Neutron stars, binary stars and pulsars. The Arecibo radio antenna. The discovery of the first binary pulsar (PS1913+16) by Husle and Taylor. This pulsar’s understanding in general relativity: A fantastic success.

scholarly journals Timing of Binary Pulsars at Kalyazin, Russia

2004 ◽  
Vol 218 ◽  
pp. 433-434 ◽  
Author(s):  
Yu. P. Ilyasov ◽  
V. V. Oreshko ◽  
V. A. Potapov ◽  
A. E. Rodin
Keyword(s):  
Energy Density ◽  
Gravitational Wave ◽  
High Precision ◽  
Radio Telescope ◽  
Orbital Period ◽  
Binary Pulsar ◽  
Binary Pulsars ◽  
Upper Limits ◽  
Gravitational Wave Background

Regular high-precision timing of the binary pulsars J0613−0200, J1012+5307, J1022+1001, J1640+2224, J1643−1224, J1713+0747, J2145−0750 and the pulsar B1937+21 has been conducted at the Kalyazin (Russia) radio telescope RT-64 at 0.6 GHz over more than 6 years. Several of the pulsars monitored have been found to be good probes for gravitational wave background (GWB) tests, while others, having a shorter orbital period, can be used for establishing a dynamical binary pulsar timescale. Upper limits for the GWB energy density were estimated.

4. Gravitational waves

2017 ◽  
pp. 46-57
Author(s):  
Timothy Clifton
Keyword(s):  
Gravitational Field ◽  
Neutron Stars ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Laser Interferometer ◽  
Space Time ◽  
Binary Pulsar ◽  
Set Up ◽  
The Waves

As stars collapse they eject huge amounts of mass and energy; their gravitational field changes rapidly and, therefore, so does the curvature of the space-time around them. If the curvature of space-time is pushed out of equilibrium, by the motion of mass or energy, this disturbance travels outwards as waves. ‘Gravitational waves’ explains the effect of a gravitational wave: in a binary pulsar, the waves carry energy away from the system so that the two neutron stars slowly circle in towards each other. Gravitational waves were first detected in 2015 by the Laser Interferometer Gravitational-Wave Observatory in America. There are also plans to set up a detector in space.

Problems on the Gravitational Wave and the Repulsive Gravitation

2016 ◽  
pp. 4422-4429
Author(s):  
C. Y. Lo
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Einstein Equation ◽  
Wave Solution ◽  
Dynamic Solution ◽  
Pure Mathematics ◽  
Non Linear

It is exciting that the gravitational wave has been confirmed, according to the announcement of LIGO. This would be the time to fix the Einstein equation for the gravitational wave and the nonexistence of the dynamic solution. As a first step, theorists should improve their pure mathematics on non-linear mathematics and related physical considerations beyond Einstein. Then, it is time to rectify the Einstein equation that has no gravitational wave solution which Einstein has recognized, and no dynamic solution that Einstein failed to see. A problem is that physicists in LIGO did not know their shortcomings. Also, in view of the far distance of the sources, it is very questionable that the physicists can determine they are from black holes. Moreover, since the repulsive gravitation can also generate a gravitational wave, the problem of gravitational wave is actually far more complicated than we have known. A useful feature of the gravitational wave based on repulsive gravitation is that it can be easily generated on earth. Thus this can be a new tool for communication because it can penetrate any medium.

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