Arguably the strongest of all fundamental forces, scientists classify gravity as the weakest of all four fundamental forces of known universe. The gravitational force is approximately 38 orders of magnitude weaker of the strong force, 36 orders of magnitude weaker of the electromagnetic force and 29 orders of magnitude weaker of the weak force.
Gravitation or gravity is a natural phenomenon by which all physical bodies made of ordinary matter attract each other. Gravity gives weight to physical objects and causes them to fall toward the ground when dropped.
The purpose of this study is to define the true reason of gravity by creating a new model named as "New Gravity Model" in an effort of using it as an input to the Unification Theory.
During this study the history of research on gravity is presented in chronological order covering :
Also known as Newtonian Physics, Classical Physics (mechanics) describes the motion of macroscopic objects, from projectiles to parts of machinery, as well as astronomical objects, such as spacecraft, planets, stars, and galaxies.
Newtonian mechanics also provides extremely accurate results as long as the domain of study is restricted to large objects and the speeds involved do not approach the speed of light. Newtonian mechanics is the most accurate branch of physics when compared with Relativistic and Quantum Physics. Assuming that all relevant attributes of the system are known (unlike Quantum mechanics) it provides the exact result (behavior) of the system under study.
According to the Newton's law of universal gravitation, gravitational force of two bodies of mass is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Proposed by Einstein, gravity in relativistic physics is explained by the General Theory of Relativity which describes gravitation as a consequence of the curvature of spacetime.
Gravity is not well defined and understood by Quantum Physics.
Gravity is the only obstacle for the Unification Theory from Quantum mechanics point of view. Hence, modern scientists in the branch of Particle Physics are working to figure out the missing gravity particle to conclude their studies.
It is hypothesized that the gravitational force is mediated by a massless spin-2 particle called the graviton and that gravity would have separated from the electro-nuclear force during the grand unification epoch (creation of universe and physical laws).
Table below summarizes the results of the study on existing models of gravity.
| Gravity Model | Gravity | Results on Gravity | Conclusion |
| Classical Physics | Covered | Correct | Accept |
|---|---|---|---|
| Relativistic Physics | Covered | Partially correct | Update required |
| Quantum Physics | Partially covered | False | Reject |
Please click below for justification.
Please click below for details on research results.
In search for a Unification Theory (also known as Theory of Everything), the merging of Classical Physics, General Relativity and Quantum Mechanics (or Quantum Field Theory) into a more general theory of Quantum Gravity has become an area of active research.
In order to unify all branches of physics a "New Gravity Model" has been developed which explains the following :
| New Gravity Model | Status | Result | Conclusion |
| What is gravity ? | Reviewed | Explained | New Gravity Model |
|---|---|---|---|
| What is gravity field ? | Reviewed | Explained | New Gravity Model |
| How does this gravity field interacts with other matter in our universe ? | Reviewed | Explained | New Gravity Model |
| What is the relation between space-time-gravity ? | Reviewed | Explained | New Gravity Model |
| What is the relation between gravity-matter-dark matter-dark energy ? | Reviewed | Explained | New Gravity Model |
| How should a gravity field be modelled so that it can open door to Unification Theory ? | Reviewed | Explained | New Gravity Model |
Please click below for justification.