Unified Field Theory (UFT)  -  considers that gravity is the result of space-time distortion by energy. It supports the gravity equation as follow:
In recent test results  -  , the final mass of the combined mass of merged black hole is 62 solar masses. If V = C, the frequency calculated based on the above equations will be: 521 Hz.
For the twin black holes, the frequency is doubled: 1042 Hz.
The actual test result  (Figure 1) is that the max frequency is 336 Hz.
Assume that the rotation speed is:
The frequency is changed to:
According to the test result, the twin black hole failed to maintain the orbit. In 4 cycles, they collided.
When two black holes merge, the circulation speed is:
Figure 1. Gravitational wave experiment results.
When particles circling around the black hole:
2.1. Black Hole Internal Structure
The structural formula  for proton is (in unit of electron mass):
In order to resist gravitational pressure in a black hole shell, the particle has to be stable. When the mass of the particle in unit of electron mass is divisible by strong interaction energy 137 instead of (2 × 3 × 5)2, the particle is perfectly in resonance with strong force and most stable (in unit of electron mass). The known particles do not have such characteristics. Since the know particles have three axes in Figure 2, the formula will start with:
A stable strong interacted axis is neutral. Since component with mass of 137 is charged. To make it both divisible and neutral, X can be:
2n × 137(2m−1) or n × 137(2m)
n, m = 1, 2, 3, …
3 × X:
3 × (2n × 137(2m−1)) or 3 × (n × 137(2m))
3 × (4 × 1372)
3 × (3 × 1372)
3 × (2 × 1372)
3 × (1372)
3 × (128 × 137)
3 × (64 × 137)
3 × (32 × 137)
3 × (16 × 137)
3 × (8 × 137)
3 × (4 × 137)
3 × (2 × 137)
2.2. Dark Matter
Any structure in following formula (in unit of electron mass):
Can silently interact with any structure in above formula without releasing energy:
Three different particles:
The interaction without releasing energy leads to the “dark” character of the above structures.
When the neighboring particles share the same structure, they are in resonance. The neighbor particles in a shell should have the same structure.
The particles do not bind together with strong force. They form perfect crystal layers with no friction between layers. In Figure 3, the crystal planes are parallel to the surface of the black hole.
2.3. Particle Orientation and Sphere
When a particle moves down toward the core of a black hole, the gravity accelerates the particle. It will collide with a particle and stops. If one of the axis of the octahedron dark particle is parallel to the axis of the black hole, the collision does not cause particles to spin. Therefore, one of the axis of the octahedron dark particle is parallel to the axis of the black hole.
Two neighboring particles vertical to the black hole axis are colliding due to the heat. For the same reason, their axes are lined up, one axis along Longitude, and one axis along Latitude.
We predict that the movements vertical to the axis are heat movements. A simple movement can be in form of vibration along axes. Such heat vibration vertical to the axis create spheres. The heat vibration generates pressure in the spheres and cancels out gravity introduced pressure within a sphere.
A stable black hole has no pressure between shells in the stable areas.
Figure 2. Particles in black hole.
Figure 3. Black hole crystal.
2.4. Particle Speed in the Sphere and Heat
The internal collision of the sphere at the equator should cancel out the gravity of half sphere.
rp: 0.84 × 10−16 m, radius of particle.
r: radius of sphere.
If the Sun becomes a black hole, it will be the smallest black hole ever found. The radius:
The smallest radius is the radius of proton, or:
V reaches to the maximum speed:
Black holes are very cold indeed.
3.1. Unreachable Event Horizon
The spheres in the black hole create a stable system. Such system stops further crashing from happening and there will be no path to reach the event horizon. Instead, the escape energy is one half of the inertia energy, a stable black hole follows:
3.2. Transparent Crystal
are octahedron shaped.
Topologically, octahedron particle formed sphere Figure 4 has two poles. An octahedron on the sphere has one axis vertical to the sphere, one axis along Longitude, and one axis along Latitude.
The Longitude effects are less in the areas close to two poles. The particles are mainly aligned with the axis of the black hole and the other two axes are aligned by external forces and form a perfect crystal.
The areas further away from the poles have disproportional crystal dislocations that lead to pressures between the shells and form unstable fault structures shaped as squared cylinders/cones. The pressure causes movements along the fault surface. The energy will be released continuously from fault surface as particles crash down toward the core of black hole along the fault surface.
For a single black hole  Figure 5, it has both cross shaped bright arms and circular features.
Due to the gravity, photons release from the deep fault surface are red shifted, while photons from the upper level of black hole are blue (less red shifted).
Figure 4. Octahedron particle sphere and fault cone.
Figure 5. Quasar 1 and defect cones near a pole.
Figure 6. Squared quasar and defect cones near a pole.
Figure 7. Black hole jet.
3.3. Black Hole Jet
When there is an accretion disk, circling matter will touch the surface of black hole, where the vibration movements along a longitude convert the circling matter into layers of spheres wrapping around the black hole. The newly formed spheres twist upwards. When these particles reach a pole, they are accelerated by out-going black hole energy at the poles. The particles are continuously pulled into the new sphere from the rotating disk and ejected at the top of pole. This dynamic process forms a black hole jet Figure 7.
We predict that:
1) A black hole is composed of dark particles structured as follows:
2) The black hole radius is;
3) A black hole has a stable octahedron dark particle formed cold spheres. There is no pressure between the spheres;
4) These octahedron dark particles formed spheres have two poles and fault cones which emit black hole energy;
5) Particles circling a black hole wrap around the black hole and form spheres which are ejected out at the poles to form black hole jets.
Additional studies are warranted regarding fault cones, black hole jet, and interactions between two neighboring black holes.
 Cao, Z.L. and Cao, H.G. (2014) Unified Field Theory and Topology of Nuclei. International Journal of Physics, 2, 15-22.
 Cao, Z.L. and Cao, H.G. (2013) Unified Field Theory. American Journal of Modern Physics, 2, 292-298.
 Cao, H.G., Cao, Z.L. and Qiang, W. (2015) Nuclear Lattices, Mass and Stability. Open Access Library Journal, 2, e1504.
 Cao, Z.L., Cao, H.G. and Qiang, W. (2015) Theory of Everything. Frontiers of Astronomy Astrophysics and Cosmology, 1, 31-36.
 (2016) Gravitational Waves Discovered at Long Last. Quanta Magazine.
 Abbott, B.P., (LIGO Scientific Collaboration and Virgo Collaboration) et al. (2016) Observation of Gravitational Waves from a Binary Black Hole Merger. Physical Review Letters, 116, 061102.
 Glikman, E., et al. (2015) Major Mergers Host the Most-Luminous Red Quasars at z ~ 2: A Hubble Space Telescope WFC3/IR Study. Astrophysical Journal, 806, 218.