Epistemology of Experimental Gravity - Scientific Rationality

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MultiMedia Publishing - 216 pagini

The evolution of gravitational tests from an epistemological perspective framed in the concept of rational reconstruction of Imre Lakatos, based on his methodology of research programmes. Unlike other works on the same subject, the evaluated period is very extensive, starting with Newton's natural philosophy and up to the quantum gravity theories of today. In order to explain in a more rational way the complex evolution of the gravity concept of the last century, I propose a natural extension of the methodology of the research programmes of Lakatos that I then use during the paper. I believe that this approach offers a new perspective on how evolved over time the concept of gravity and the methods of testing each theory of gravity, through observations and experiments. I argue, based on the methodology of the research programmes and the studies of scientists and philosophers, that the current theories of quantum gravity are degenerative, due to the lack of experimental evidence over a long period of time and of self-immunization against the possibility of falsification. Moreover, a methodological current is being developed that assigns a secondary, unimportant role to verification through observations and/or experiments. For this reason, it will not be possible to have a complete theory of quantum gravity in its current form, which to include to the limit the general relativity, since physical theories have always been adjusted, during their evolution, based on observational or experimental tests, and verified by the predictions made. Also, contrary to a widespread opinion and current active programs regarding the unification of all the fundamental forces of physics in a single final theory, based on string theory, I argue that this unification is generally unlikely, and it is not possible anyway for a unification to be developed based on current theories of quantum gravity, including string theory. In addition, I support the views of some scientists and philosophers that currently too much resources are being consumed on the idea of developing quantum gravity theories, and in particular string theory, to include general relativity and to unify gravity with other forces, as long as science does not impose such research programs.




    Gravitational tests

    Methodology of Lakatos - Scientific rationality

    The natural extension of the Lakatos methodology

       Bifurcated programs

       Unifying programs

 1. Newtonian gravity

    1.1 Heuristics of Newtonian gravity

    1.2 Proliferation of post-Newtonian theories

    1.3 Tests of post-Newtonian theories

       1.3.1 Newton's proposed tests

       1.3.2 Tests of post-Newtonian theories

    1.4 Newtonian gravity anomalies

    1.5 Saturation point in Newtonian gravity

 2. General relativity

    2.1 Heuristics of the general relativity

    2.2 Proliferation of post-Einsteinian gravitational theories

    2.3 Post-Newtonian parameterized formalism (PPN)

    2.4 Tests of general relativity and post-Einsteinian theories

       2.4.1 Tests proposed by Einstein

       2.4.2 Tests of post-Einsteinian theories

       2.4.3 Classic tests

 Precision of Mercury's perihelion

 Light deflection

 Gravitational redshift

       2.4.4 Modern tests

 Shapiro Delay

 Gravitational dilation of time

 Frame dragging and geodetic effect

 Testing of the principle of equivalence

 Solar system tests

       2.4.5 Strong field gravitational tests

 Gravitational lenses

 Gravitational waves

 Synchronization binary pulsars

 Extreme environments

       2.4.6 Cosmological tests

 The expanding universe

 Cosmological observations

 Monitoring of weak gravitational lenses

    2.5 Anomalies of general relativity

    2.6 The saturation point of general relativity

 3. Quantum gravity

    3.1 Heuristics of quantum gravity

    3.2 The tests of quantum gravity

    3.3 Canonical quantum gravity

       3.3.1 Tests proposed for the CQG

       3.3.2. Loop quantum gravity

    3.4 String theory

       3.4.1 Heuristics of string theory

       3.4.2. Anomalies of string theory

    3.5 Other theories of quantum gravity

    3.6 Unification (The Final Theory)

 4. Cosmology




 DOI: 10.13140/RG.2.2.35350.70724


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Owner and manager with MultiMedia SRL and MultiMedia Publishing House.

 Project Coordinator for European Teleworking Development Romania (ETD)

 Member of Rotary Club Bucuresti Atheneum

 Cofounder and ex-president of the Mehedinti Branch of Romanian Association for Electronic Industry and Software

 Initiator, cofounder and president of Romanian Association for Telework and Teleactivities

 Member of Internet Society

 Initiator, cofounder and ex-president of Romanian Teleworking Society

 Cofounder and ex-president of the Mehedinti Branch of the General Association of Engineers in Romania

 Physicist engineer - Bachelor of Science (Physics, Major Nuclear Physics). Master of Philosophy.

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