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Purely Virtual Particles in Quantum Gravity, Inflationary Cosmology and Collider Physics

Damiano Anselmi
2022 Symmetry  
We review the concept of purely virtual particle and its uses in quantum gravity, primordial cosmology and collider physics.  ...  Quantum gravity propagates the graviton, a massive scalar field (the inflaton) and a massive spin-2 fakeon, and leads to a constrained primordial cosmology, which predicts the tensor-to-scalar ratio r  ...  Conclusions Purely virtual particles have a variety of applications, which range from collider physics, to quantum gravity and primordial cosmology.  ... 
doi:10.3390/sym14030521 fatcat:ou5wh5e6kjeq5lq56il6ig4y6y

HIGH-ENERGY DENSITY IMPLICATIONS OF A GRAVITOWEAK UNIFICATION SCENARIO

ROBERTO ONOFRIO
2014 Modern Physics Letters A  
Furthermore, the quantum vacuum contribution to the cosmological constant is reduced by several orders of magnitude with respect to the current estimates.  ...  Particles with larger Yukawa couplings are not precluded, but should interact only gravitationally, providing a natural candidate for dark matter.  ...  Another longstanding issue of the current interface between cosmology and high-energy physics -the contribution of quantum fluctuations to the cosmological constant -is also mitigated.  ... 
doi:10.1142/s0217732313501873 fatcat:vmlnoyglvvgwboplqvv3jyl2m4

Experimental Search for Quantum Gravity [article]

Sabine Hossenfelder
2010 arXiv   pre-print
First, we outline the questions we wish to address, and then introduce some of the phenomenological models that are currently used in quantum gravity, both with and without a lowered Planck scale.  ...  We offer a brief survey of existent and planned experimental tests for quantum gravity.  ...  I further thank all participants of the workshop on Experimental Search for Quantum Gravity that took place at NORDITA, Stockholm, July 12-16, 2010.  ... 
arXiv:1010.3420v1 fatcat:j3ngyublqrddhl7mcszedehnsu

Quantum gravity: a solution for current problems in cosmology and particle physics [article]

F. Darabi
2008 arXiv   pre-print
Then we show this model is capable of solving the important problems of cosmology and particle physics.  ...  This is based on a new interpretation in which quantum gravity is not an interaction, rather it is just responsible for generation of space-time-matter.  ...  Acknowledgment This work has been supported financially by Research Institute for Astronomy and Astrophysics of Maragha (RIAAM).  ... 
arXiv:0809.1282v3 fatcat:htyd4fbervhpnp2du7cov7zmcu

Introduction to Elementary Particle Physics

C. J. Solano Salinas, K. Hurtado, C. Romero, Carlos Javier Solano Salinas, Jose Bellido, David Wahl, Oscar Saavedra
2009 AIP Conference Proceedings  
This is a short review of Particle Physics and the most widely accepted theory, the Standard Model, with its questions and limitations.  ...  It is based in the introductory talk given the Third School on Cosmic Rays and Astrophysics held in Arequipa, Peru.  ...  ACKNOWLEDGMENTS The authors would like to thank the Centro de Tecnologias de Informacion y Comunicaciones, Lima, Peru, for their support in undertaking this work. C. J. S.  ... 
doi:10.1063/1.3141350 fatcat:wj4workgevgjnltjd4wj3j73ly

The Present Status of Particle Physics with Slow Neutrons

Dirk Dubbers
2014 Physics Procedia  
This overview on the present status of neutron-particle physics is intended to serve as a basis for the ensuing discussion of the potential and future development of neutron-particle physics at the European  ...  Slow neutrons are a privileged tool to explore the low-energy high-precision frontier of particle physics.  ...  Particle physics, the physics of the very small, and cosmology, the physics of the very large, indeed are intimately interwoven in standard big bang theory (or variants thereof).  ... 
doi:10.1016/j.phpro.2013.12.005 fatcat:gqnmitbykjaxxif7yinurprvve

ANTICIPATING A NEW GOLDEN AGE

FRANK WILCZEK
2008 International Journal of Modern Physics A  
Several major questions seem ripe for exploration in the near future. I anticipate that the coming decade will be a Golden Age of discovery in fundamental physics.  ...  Moreover, this process is purely quantum-mechanical, twice over.  ...  For the unification of quantum numbers, though attractive, remains purely formal until it is embedded in a physical model. To do that, one must realize the enhanced symmetry in a local gauge theory.  ... 
doi:10.1142/s0217751x08040391 fatcat:uvaayzedm5emzdwjesgczrfsai

Vanishing dimensions: Review [article]

Dejan Stojkovic
2014 arXiv   pre-print
A convincing evidence for dimensional reduction may be found in future in collider experiments and gravity waves observatories.  ...  theories, the Wheeler-DeWitt equation and phenomenon of "asymptotic silence".  ...  The concrete action S = S free + S mass allows us to address explicitly the problems in cosmology, gravity and high energy physics.  ... 
arXiv:1406.2696v1 fatcat:kjmvo3a36bgd7korngxd5mzugy

Black holes, quantum information, and the foundations of physics

Steven B. Giddings
2013 Physics today  
When particles collide at ultrahigh energies, 3 as in the key thought experiment introduced earlier, a two-particle pure state scatters and produces a multiparticle state that is, in Hawking's proposal  ...  An important thought experiment for quantum gravity-perhaps the key thought experiment-is to imagine two quantum particles colliding at sufficiently high energy and small impact parameter to make a quantum  ... 
doi:10.1063/pt.3.1946 fatcat:p43ag7bt6bfcjmc7k36nlxyvwa

Stephen William Hawking CH CBE. 8 January 1942—14 March 2018

Bernard J. Carr, George F. R. Ellis, Gary W. Gibbons, James B. Hartle, Thomas Hertog, Roger Penrose, Malcolm J. Perry, Kip S. Thorne
2019 Biographical Memoirs of Fellows of the Royal Society  
Stephen Hawking's contributions to the understanding of gravity, black holes and cosmology were truly immense.  ...  His organisation of and contributions to the Nuffield Workshop in 1982 consolidated the picture that the large-scale structure of the universe originated as quantum fluctuations during the inflationary  ...  Malcolm Perry and Anna N.Żytkow were particularly helpful in editing the memoir and clarifying parts of the story.  ... 
doi:10.1098/rsbm.2019.0001 fatcat:56w5f5j3s5ai7ktw5sfoz5hj4m

In search of symmetry lost

Frank Wilczek
2005 Nature  
But soon the theory will undergo a critical test depending on whether the quanta of this symmetry-breaking field, the so-called Higgs particles, are produced at the Large Hadron Collider (due to begin  ...  operation in 2007).  ...  This effect is purely quantum-year of physics review articles mechanical.  ... 
doi:10.1038/nature03281 pmid:15662411 fatcat:u7csoxbgjnc2vawaqfdwcbuwem

The cyclic model simplified

Paul J. Steinhardt, Neil Turok
2005 New astronomy reviews (Print)  
At one stroke, this shows how the model is different from inflation and why it may work just as well as inflation in resolving cosmological problems.  ...  In particular, we show that the contraction phase has equation of state w>1 and that contraction with w>1 has a surprisingly similar properties to inflation with w < -1/3.  ...  Tolley, and D. Wesley, for their important contributions to the work discussed herein, and, also, M. Kleban, R. Bousso, E. Flanagan, and L. Susskind for valuable discussions.  ... 
doi:10.1016/j.newar.2005.01.003 fatcat:d5kvzky2hfaovinaxxfhshenzm

Fourth quantization

Mir Faizal
2013 Physics Letters B  
We also analyse the effect of interactions in this fourth quantized theory.  ...  In this paper we will analyse the creation of the multiverse. We will first calculate the wave function for the multiverse using third quantization. Then we will fourth quantize this theory.  ...  Virtual black holes in third quantized f (R) gravity has also been studied [19] . In doing so a solution to the problem of time has also been proposed.  ... 
doi:10.1016/j.physletb.2013.10.069 fatcat:66awscwxxjhethy2vzztuzlvla

SUPERSYMMETRY AND OTHER SCENARIOS

E. WITTEN
2004 International Journal of Modern Physics A  
In this talk, I survey the merits and demerits of Supersymmetry, as well as other approaches to the gauge hierarchy problem.  ...  Its elegance in incorporating the physics we know, reconciling quantum mechanics with gravity, and giving new insights about familiar theories convinces me of that.  ...  ) interpreted in terms of an inflationary epoch close to the GUT scale.  ... 
doi:10.1142/s0217751x04019160 fatcat:7tueizhkzzczzi3iurvglsyo24

Signals of a Quantum Universe

Daniel Green, Rafael A. Porto
2020 Physical Review Letters  
Unlike in quantum mechanics, vacuum fluctuations cannot arise in classical theories and therefore long-range classical correlations must result from (real) particles in the initial state.  ...  Following this observation, and assuming fluctuations are (i) correlated over large scales and (ii) generated by local evolution during an inflationary phase, we demonstrate that the absence of a pole  ...  -The origin of structure as a result of vacuum fluctuations is a purely quantum mechanical phenomena, for classical effects can only arise when states contain (many) physical particles.  ... 
doi:10.1103/physrevlett.124.251302 pmid:32639787 fatcat:hbeqjuimxrb67le5an6lt3eb5q
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