scholarly journals Note on spin-2 particle interpretation of the 750 GeV diphoton excess

2016 ◽  
Vol 93 (11) ◽  
Author(s):  
Chao-Qiang Geng ◽  
Da Huang
Keyword(s):  
Particle Interpretation

Vacuum polarization and particle creation in the presence of a potential step

2016 ◽  
Vol 31 (02n03) ◽  
pp. 1641031 ◽  
Author(s):  
S. P. Gavrilov ◽  
D. M. Gitman
Keyword(s):  
Electric Potential ◽  
Canonical Quantization ◽  
Particle Creation ◽  
Pair Creation ◽  
Dirac Field ◽  
Potential Step ◽  
Electron Positron ◽  
Physical Impact ◽  
Particle Interpretation ◽  
Electron Positron Pair

We consider QED with strong external backgrounds that are concentrated in restricted space areas. The latter backgrounds represent a kind of spatial x-electric potential steps for charged particles. They can create particles from the vacuum, the Klein paradox being closely related to this process. We describe a canonical quantization of the Dirac field with x-electric potential step in terms of adequate in- and out-creation and annihilation operators that allow one to have consistent particle interpretation of the physical system under consideration and develop a nonperturbative (in the external field) technics to calculate scattering, reflection, and electron-positron pair creation. We resume the physical impact of this development.

LIMITATIONS ON THE STATISTICAL DESCRIPTION OF BLACK HOLES

1991 ◽  
Vol 06 (26) ◽  
pp. 2353-2361 ◽  
Author(s):  
JOHN PRESKILL ◽  
PATRICIA SCHWARZ ◽  
ALFRED SHAPERE ◽  
SANDIP TRIVEDI ◽  
FRANK WILCZEK
Keyword(s):  
Elementary Particle ◽  
Black Holes ◽  
Temperature Limit ◽  
Zero Temperature ◽  
Charged Black Holes ◽  
Thermal Object ◽  
Particle Interpretation

We argue that the description of a block hole as a statistical (thermal) object must break down as the extreme (zero-temperature) limit is a approached, due to uncontrollable thermodynamic fluctuatations. For the recently discovered charged black holes, the analysis is significantly different, but again indicates that a statistical decription of the extreme hole is inappropriate. These holes invite a more normal elementary particle interpretation than is possible for Reissner-Nordström hole.

scholarly journals A backward particle interpretation of Feynman-Kac formulae

2010 ◽  
Vol 44 (5) ◽  
pp. 947-975 ◽  
Author(s):  
Pierre Del Moral ◽  
Arnaud Doucet ◽  
Sumeetpal S. Singh
Keyword(s):  
Particle Interpretation

scholarly journals A simple explanation of the nonappearance of physical gluons and quarks

2002 ◽  
Vol 80 (9) ◽  
pp. 1093-1097 ◽  
Author(s):  
J Hansson
Keyword(s):  
Experimental Evidence ◽  
Quantum Chromodynamics ◽  
Approximation Method ◽  
Perturbative Expansion ◽  
Simple Explanation ◽  
Yang Mills ◽  
Quark Field ◽  
Physical Particle ◽  
Color Field ◽  
Particle Interpretation

We show that the nonappearance of gluons and quarks as physical particles is a rigorous and automatic result of the full, i.e., nonperturbative, nonabelian nature of the color interaction in quantum chromodynamics (QCD). This makes it, in general, impossible to describe the color field as a collection of elementary quanta (gluons). Neither can a quark be an elementary quantum of the quark field, as the color field of which it is the source is itself a source, making isolated noninteracting quarks, crucial for a physical particle interpretation, impossible. In geometrical language, the impossibility of quarks and gluons as physical elementary particles arises due to the fact that the color Yang–Mills space does not have a constant trivial curvature. In QCD, the particles "gluons" and "quarks" are merely artifacts of an approximation method (the perturbative expansion) and are simply absent in the exact theory. This also coincides with the empirical, experimental evidence. PACS Nos.: 12.38Aw, 03.70+k, 11.15-q

scholarly journals PHYSICAL SPECTRUM FROM CONFINED EXCITATIONS IN A YANG–MILLS-INSPIRED TOY MODEL

2013 ◽  
Vol 28 (10) ◽  
pp. 1350034 ◽  
Author(s):  
M. A. L. CAPRI ◽  
D. DUDAL ◽  
M. S. GUIMARAES ◽  
L. F. PALHARES ◽  
S. P. SORELLA
Keyword(s):  
Field Theory ◽  
Bound States ◽  
Gauge Theories ◽  
Spectral Representation ◽  
Complex Conjugate ◽  
Meson Mass ◽  
Yang Mills ◽  
Physical Spectrum ◽  
Real Mass ◽  
Particle Interpretation

We study a toy model for an interacting scalar field theory in which the fundamental excitations are confined in the sense of having unphysical, positivity-violating propagators, a fact tracing back to a decomposition of these in propagators with complex conjugate mass poles (the so-called i-particles). Similar two-point functions show up in certain approaches to gluon or quark propagators in Yang–Mills gauge theories. We investigate the spectrum of our model and show that suitable composite operators may be constructed having a well-defined Källén–Lehmann spectral representation, thus allowing for a particle interpretation. These physical excitations would correspond to the "mesons" of the model, the latter being bound states of two unphysical i-particles. The meson mass is explicitly estimated from the pole emerging in a resummed class of diagrams. The main purpose of this paper is thus to explicitly verify how a real mass pole can and does emerge out of constituent i-particles that have complex masses.

scholarly journals CONFORMAL INVARIANCE AND QUANTUM ASPECTS OF MATTER

2000 ◽  
Vol 15 (07) ◽  
pp. 983-988 ◽  
Author(s):  
H. MOTAVALI ◽  
H. SALEHI ◽  
M. GOLSHANI
Keyword(s):  
Conformal Invariance ◽  
Conformal Transformation ◽  
Gravitational Model ◽  
Particle Interpretation ◽  
Quantum Aspects

The vacuum sector of the Brans–Dicke theory is studied from the viewpoint of a nonconformally invariant gravitational model. We show that, this theory can be conformally symmetrized using an appropriate conformal transformation. The resulting theory allows a particle interpretation, and suggests that the quantum aspects of matter may be geometrized.

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