Abstract:
I propose a phenomenological model for the decay of black holes near
Planck mass. The decay takes place via a quantum state between general
relativity and a grand unified field theory like SO(10). This group is favored
also by a no-scale SUGRA GUT model for Starobinsky inflation by other authors.

Abstract:
The phenomenological model proposed in this note indicates that the black
hole radiation consists of two components: the standard thermal Hawking
radiation and an additional non-thermal baryonic/leptonic component due to
quantum number neutralization by the no-hair theorem. The particle radiation
grows relatively stronger than the Hawking radiation with increasing black hole
mass, and it can be tested in principle.

Abstract:
I propose first a simple model for quantum black holes based on a
harmonic oscillator representing the black hole horizon covered by Planck
length sized squares carrying soft hair. Secondly, I redefine the partition
function sum over horizon squares by a sum over black hole stretched horizon
constituents which are black holes themselves. From this partition function Hawking
radiation and Bekenstein-Hawking entropy law have been predicted. Based on this
model I propose that the structures of black holes and spacetime atoms are the
same. Requiring consistent quantization for both spacetime and matter, black
hole structure is considered for matter particles using a composite model for
quarks and leptons.

I consider a statistical mechanical model for black holes as atoms of
spacetime with the partition function sum taken over area eigenvalues as given
by loop quantum gravity. I propose a unified structure for matter and spacetime
by applying the area eigenvalues to a black hole composite model for quarks and
leptons. Gravitational baryon number’s non-conservation mechanism is predicted.
Argument is given for unified field theory based on gravitational and
electromagnetic interactions only. The standard model of non-Abelian gauge
interactions is briefly discussed.

I consider a preon model
for quarks and leptons based on constituents defined by mass, spin and charge.
The preons form a finite combinatorial system for the standard model fermions.
The color and weak interaction gauge structures can be deduced from the preon
bound states. By applying the area eigenvalues of loop quantum gravity to black
hole preons, one
gets a preon mass spectrum starting from zero. Gravitational baryon number
non-conservation mechanism is obtained. Argument is given for unified field
theory is based only on gravitational and electromagnetic interactions of
preons.

I consider a preon model for quarks and leptons based on
massless constituents having spin 1/2 and
charge 1/3 or 0. The color
and weak interaction gauge structures can be deduced from the three preon
states. Argument is given for unified field theory being based on gravitational
and electromagnetic interactions only. Conformal symmetry is introduced in the action of gravity with
the Weyl tensor. Electromagnetism is geometrized to conform with gravity. Baryon number non-conservation mechanism is obtained.

I consider the standard model, together with a preon version of it, to search for unifying principles between quantum particles and general relativity. Argument is given for unified field theory being based on gravitational and electromagnetic interactions alone. Conformal symmetry is introduced in the action of gravity with the Weyl tensor. Electromagnetism is geometrized to conform with gravity. Conformal symmetry is seen to improve quantization in loop quantum gravity. The Einstein-Cartan theory with torsion is analyzed suggesting structure in spacetime below the Cartan scale. A toy model for black hole constituents is proposed. Higgs metastability hints at cyclic conformal cosmology.

I study the properties of a preon model for the substructure of the standard model quarks and leptons. The goal is to establish both local and global group representations for the particles of the model. Knot theory algebra SLq(2) is shown to be applicable to the model. Teleparallel gravity is discussed with an interesting result to hadronic physics. A tentative glimpse on quantum gravity is indicated.

A previous spin 1/2 preon model for the substructure
of the standard model quarks and leptons is complemented to provide particle
classification group, preon interactions and
a tentative model of black holes. The goal of this study is to analyze a phenomenological theory of all interactions. A minimal amount of
physical assumptions are made and only experimentally verified global and gauge
groups are employed: SLq(2), the three of the standard model and the full
Poincaré group. Gravity theory with torsion is introduced producing an axial-vector field coupled to preons. The mass of the
axial-vector particle is estimated to be near the GUT scale. The boson
can materialize above this scale and gain further mass to become a black hole
at Planck mass while massless preons may form the horizon. A particle-black
hole duality is proposed.

A previous preon model for
the substructure of the standard model quarks and leptons is completed to
provide a model of Planck scale gravity and black holes. Gravity theory with
torsion is introduced in the model. Torsion has been shown to produce an
axial-vector field coupled to spinors, in the present case preons, causing an
attractive preon-preon interaction. This is assumed to be the leading term of
UV gravity. The boson has an estimated mass near the Planck scale. At high
enough density it can materialize and become the center of a black hole. Chiral
phase preons are proposed to form the horizon with thickness of order of Planck
length. Using quantum information theoretic concepts this is seen to lead to an
area law of black hole entropy.