From the standpoint of gravitomagnetism theory, does energy loss of binary pulsar PSR1913+16 require the system to have an orbital velocity around the center of our galaxy?
"rotation speed is diminishing"
Amrit: I understand rotation speed is increasing. - Edit: Sorry, maybe I was wrong with term "rotation speed" which I understood as angular velocity.
It seems likely that collapsed bodies like black holes and neutron stars will spin rapidly at least until they are very old. Rapid rotation tends to centrifuge the contents and induce an electric charge separation either real electrons or virtual space polarization near the surface or event horizon. Either way the rapid movement of an electric potential suggests that magnetic fields will accompany nearly all collapsed objects, even if the fields are not oriented toward our detectors. It the close pair both have magnetic fields, then eventually they should align their fields opposite polarity, which has not apparently happened yet with PSR1913+16 since one neutron star Is pulsar to us and the companion neutron star is not. I would guess that gravitomagnetism is not large in the system, because of unfavorable spin directions.
On a second topic, the spin rotation slows down gradually, and the orbit period speeds up gradually, both because of energy lost from the system.
Jerry: Thanks for your comments. By "gravitomagnetism" I mean the concept of extending Newtons gravitational laws as devised and published in1893 by Oliver Heaviside in analogy to Maxwell's theory on electromagnetism. My question relates to the gravitational energy loss and associated orbital acceleration (*) as discovered in the late 1970s by Hulse and Taylor on the PSR1913+16 binary system irrespective of individual spin of the components.
(*) Edit: Should better read "increase of angular velocity".
Johan: Thanks for the clarification. Peter Bergmann gave an introduction to the 1974 discovery of PSR1913+16 binary in his book on gravitation, in connection with a chapter that claimed polarization of gravity waves very much like is proven to occur in electromagnetic waves. It leads to the arguments for transverse gravity waves rather then longitudinal gravity waves. The history as you pointed out predates relativity. Much of the scientific community but not all have adopted the views of Bergmann mostly on theory.
I suggest we consider the consequence of gravity transverse components in the one reoccurring gravity wave that is most accessible to us, the Moon tides of Earth. Then the oceans are the detectors although imperfect biased by land masses and influenced by Sun tides contributing to uncertainties. If the Earth Moon gravity wave is transverse then the tides should move North and South from the sub lunar points, and back again as the Earth rotates relative to the Moon, something like the right hand rule of electric motors. I haven't seen any scientific data of that sort. The large amount of data seems to indicate East West longitudinal progression of harmonic waves, with secondary high latitude effects associated with land mass interferences.
Gravitomagnetism in the form you indicated has doubtful validity. The equations say that there should be a right hand rule of force connected to gravitational energy flux. Where is the rule and the data supporting it?
More toward your question, the plane of orbit for the pair of neutron stars doesn't appear to be oscillating or rotating around the connecting line between them as would occur if electrodynamics were governing the system. I would guess that gravitomagnetism is not large in the system, because of apparent longitudinal wave dominance in the dynamics.
Jerry: Thanks for your interesting comment which apparently raises lots of further questions. In fact, I'm not so much familiar with gravitational theories and therefore just try to prove their significance in view of reliable experimental findings. In particular, I'm looking for some plausible explanation of a tiny drag observed on a high-speed steel rotor. The rotor material may in fact be regarded as an assembly of point masses (atomic nuclei) at relative distances comparable to the ones observed in binary sytems of orbiting neutron stars at a much reduced scale. See references cited below.
https://www.researchgate.net/deref/http%3A%2F%2Frmf.smf.mx%2Fpdf%2Frmf%2F12%2F1%2F12_1_1.pdf
Research A second look at experimental data suggesting gravity speed ...
Johan: Thanks again for the conversation. It applies directly to debates that are occurring on other pages. I look up the references before answering a question and often don't answer when the topic is well covered by others.
My encyclopedia of physics written by famous people, gives longitudinal harmonics as proven result of gravitational waves, and transverse (like right hand rule) as theoretical possibility as a solution to wave equations.
I agree there is a transverse component to Earth Moon tides, having lived some years at high latitude overlooking a tidal flats estuary. Also in civil engineering there is a rule of stress strain where a strain in one direction causes a lesser strain in the perpendicular direction. For Earth Moon system the stress and strain of the gravity wave causes longitudinal harmonics, which further cause the latitudinal component. I guess it satisfies the quadrupole form of gravitons, but in an unusual description.
The binaries and merging systems have a lot to teach us, hopefully over the next decade or two, as the powerful events are observed to disrupt their local neighborhoods, making optical confirmations possible for the coordinates of host systems.
About the high speed steel rotor, electric and magnetic fields tend to build up in many cases, causing a small power loss. Electrons are pushed to the edges by centrifugal force. Moving electrons drive a magnetic field. The fields are opposed by surroundings, causing the power loss. Some times electrons leak from one surface and are picked up by another. Centrifugal force provides the voltages current and power. Sometimes corrosion results from moving electrons. In one case my team found half a volt generated across rotating machinery. On other occasions grounding brushes or reverse voltage were applied to remedy a problem.
Jerry: Thanks for your detailed comments on wave polarization and possible electro magnetic cause of the drag observed on high-speed steel rotors. Due to lack of knowledge I cannot adequately comment on the wave issue. In view of electro magnetic interference, however, I can state that in our experiments we have identified and fully accounted for the effect of eddy currents induced inside and outside the spinning rotor, most of it being due to Coriolis forces. It can further be shown that drag effects due to dipole radiation, both, electric and magnetic, is many orders of magnitude smaller than the extra drag observed. Therefore, we at least don't see any reason to doubt or even disprove the ideas and theoretical predictions by J.C. Keith on the effect of retarded gravitational force interaction and associated drag as observed in our high-speed experiments.
Frame dragging is a part of general relativity made popular by Peter Bergmann, and generally accepted in the main stream. Lack of frame dragging in Polarizable Vacuum theory is one of the main reasons for rejection by specialists. I made a modification to PV that probably does provide frame dragging, but haven't pursued that aspect of it.
Some older text books claim that in laboratories dragging of one isolated and freely suspended mass is observed caused by another moving mass near by.
In my modification to PV theory I develop a proposal for space curvature caused by kinetic energy of rapid movement from fairly simple but rigorous methods. Maybe a coincidence, the LIGO data published for event GW120914 is in fairly good agreement with my prediction of mass energy converted to momentum energy, viXra:1602.0170 and viXra:1512.0397 generally written for the level of advanced high school students.
Curvature is just a gravity field attractive or repulsive, of which the repulsive components in GR for several different metric solutions usually derive from electromagnetics.
I guess the response this time is that electrodynamics in special cases of interference patterns can create at least in theory a local gravitational field. The other choice is that frame dragging especially at high speed may affect space and time in the vicinity and be measurable as a power drain on the moving object. These are rather old parts of general relativity, and not much disputed by specialists.
"... frame dragging especially at high speed may affect space and time in the vicinity and be measurable as a power drain on the moving object."
Jerry:
Your above statement seems to relate in some way to my question posted yesterday, see link below.
Comments on questions of this kind appear interesting in view of understanding the drag observed on freely spinning high-speed rotors, see publications cited above.
https://www.researchgate.net/post/Is_there_something_similar_to_synchrotron_radiation_in_gravitoelectromagnetism_GEM
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