scholarly journals Conformal symmetry and the Standard Model

2007 ◽  
Vol 648 (4) ◽  
pp. 312-317 ◽  
Author(s):  
Krzysztof A. Meissner ◽  
Hermann Nicolai
Keyword(s):  
Standard Model ◽  
Conformal Symmetry ◽  
The Standard Model

scholarly journals BOSONIC SEESAW AND A SOLUTION TO THE μ PROBLEM IN THE UNPARTICLE PHYSICS

2010 ◽  
Vol 25 (09) ◽  
pp. 691-701
Author(s):  
TATSURU KIKUCHI
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Symmetry Breaking ◽  
Conformal Symmetry ◽  
New Physics ◽  
Electroweak Symmetry Breaking ◽  
Effective Theory ◽  
Electroweak Symmetry ◽  
Hidden Sector ◽  
The Standard Model

Recently, conceptually new physics beyond the Standard Model has been proposed by Georgi, where a new physics sector becomes conformal and provides "unparticle" which couples to the Standard Model sector through higher dimensional operators in low energy effective theory. Among several possibilities, we focus on operators involving the unparticle and Higgs boson. Once the Higgs develops the vacuum expectation value (VEV), the conformal symmetry is broken and as a result, the mixing between the unparticle and the Higgs boson emerges. In the former part of this paper, we consider a natural realization of bosonic seesaw in the context of unparticle physics. In this framework, the negative mass squared or the electroweak symmetry breaking vacuum is achieved as a result of mass matrix diagonalization. So, the bosonic seesaw mechanism for the electroweak symmetry breaking can naturally be understood in the framework of unparticle physics. In the latter part of this paper, we consider the unparticle as a hidden sector of supersymmetry breaking, and give some phenomenological consequences of this scenario. The result shows that there is a possibility for the unparticle as a hidden sector in SUSY breaking sector, and can provide a solution to the μ problem in SUSY models.

scholarly journals CONTINUUM SUPERPARTNERS FROM SUPERSYMMETRIC UNPARTICLES

2010 ◽  
Vol 25 (27n28) ◽  
pp. 5210-5221
Author(s):  
HSIN-CHIA CHENG
Keyword(s):  
Standard Model ◽  
Extra Dimension ◽  
Conformal Symmetry ◽  
Conformal Theory ◽  
The Standard Model ◽  
Soft Wall ◽  
Warped Extra Dimension ◽  
The Continuum

In an exact conformal theory there is no particle. The excitations have continuum spectra and are called "unparticles" by Georgi. We consider supersymmetric extensions of the Standard Model with approximate conformal sectors. The conformal symmetry is softly broken in the infrared which generates a gap. However, the spectrum can still have a continuum above the gap if there is no confinement. Using the AdS/CFT correspondence this can be achieved with a soft wall in the warped extra dimension. When supersymmetry is broken the superpartners of the Standard Model particles may simply be a continuum above gap. The collider signals can be quite different from the standard supersymmetric scenarios and the experimental searches for the continuum superpartners can be very challenging.

scholarly journals Is the standard model saved asymptotically by conformal symmetry?

2015 ◽  
Vol 120 (3) ◽  
pp. 344-353 ◽  
Author(s):  
A. Gorsky ◽  
A. Mironov ◽  
A. Morozov ◽  
T. N. Tomaras
Keyword(s):  
Standard Model ◽  
Conformal Symmetry ◽  
The Standard Model

scholarly journals The fine tuning of the cosmological constant in a conformal model

2015 ◽  
Vol 30 (32) ◽  
pp. 1550171 ◽  
Author(s):  
Pankaj Jain ◽  
Gopal Kashyap ◽  
Subhadip Mitra
Keyword(s):  
Standard Model ◽  
Cosmological Constant ◽  
Conformal Symmetry ◽  
Scalar Fields ◽  
Fine Tuning ◽  
Strongly Coupled ◽  
Conformal Model ◽  
Hidden Sector ◽  
A Value ◽  
The Standard Model

We consider a conformal model involving two real scalar fields in which the conformal symmetry is broken by a soft mechanism and is not anomalous. One of these scalar fields is representative of the standard model Higgs. The model predicts exactly zero cosmological constant. In the simplest version of the model, some of the couplings need to be fine-tuned to very small values. We formulate the problem of fine tuning of these couplings. We argue that the problem arises since we require a soft mechanism to break conformal symmetry. The symmetry breaking is possible only if the scalar fields do not evolve significantly over the time scale of the Universe. Ignoring contributions due to quantum gravity, we present two solutions to this fine tuning problem. We argue that the problem is solved if the classical value of one of the scalar fields is super-Planckian, i.e. takes a value much larger than the Planck mass. The second solution involves introduction of a strongly coupled hidden sector that we call hypercolor. In this case, the conformal invariance is broken dynamically and triggers the breakdown of the electroweak symmetry. We argue that our analysis applies also to the case of the standard model Higgs multiplet.

scholarly journals Radiative breaking of conformal symmetry in the Standard Model

2016 ◽  
Vol 113 (3) ◽  
pp. 31001 ◽  
Author(s):  
A. B. Arbuzov ◽  
R. G. Nazmitdinov ◽  
A. E. Pavlov ◽  
V. N. Pervushin ◽  
A. F. Zakharov
Keyword(s):  
Standard Model ◽  
Conformal Symmetry ◽  
The Standard Model

Local conformal symmetry in black holes, standard model, and quantum gravity

2017 ◽  
Vol 26 (03) ◽  
pp. 1730006 ◽  
Author(s):  
Gerard ’t Hooft
Keyword(s):  
Black Holes ◽  
Standard Model ◽  
Conformal Symmetry ◽  
Local Symmetry ◽  
Coupling Constants ◽  
Indefinite Metric ◽  
The Standard Model ◽  
Exact Symmetry ◽  
Black Hole Information ◽  
Information Problem

The black hole information problem and the firewall problem can be addressed by assuming an extra local symmetry: conformal invariance. It must be an exact symmetry, spontaneously broken by the vacuum, in a way similar to the Brout–Englert–Higgs (BEH) mechanism. We note how this symmetry formally removes the horizon and the singularity inside black holes. For the Standard Model this symmetry is severely restrictive, demanding all coupling constants, masses and even the cosmological constant to be computable, in principle. Finally, this symmetry suggests that the Weyl action (the square of the Weyl curvature) should be added to the Einstein–Hilbert action. The ensuing indefinite metric states are briefly studied, and we conclude with some remarks concerning the interpretation of quantum mechanics.

Indirect measurements in micro-space with the EM

1995 ◽  
Vol 53 ◽  
pp. 598-599
Author(s):  
Sterling P. Newberry
Keyword(s):  
Electron Microscope ◽  
Standard Model ◽  
Particle Physics ◽  
Information Storage ◽  
Storage Space ◽  
Indirect Measurements ◽  
Storage And Retrieval ◽  
Adequate Information ◽  
Compelling Reason ◽  
The Standard Model

At the 1958 meeting of our society, then known as EMSA, the author introduced the concept of microspace and suggested its use to provide adequate information storage space and the use of electron microscope techniques to provide storage and retrieval access. At this current meeting of MSA, he wishes to suggest an additional use of the power of the electron microscope.The author has been contemplating this new use for some time and would have suggested it in the EMSA fiftieth year commemorative volume, but for page limitations. There is compelling reason to put forth this suggestion today because problems have arisen in the “Standard Model” of particle physics and funds are being greatly reduced just as we need higher energy machines to resolve these problems. Therefore, any techniques which complement or augment what we can accomplish during this austerity period with the machines at hand is worth exploring.

An Interview with the Physicist that Her Head in the Universe and Both Feet on the Earth

2019 ◽  
Author(s):  
Adib Rifqi Setiawan
Keyword(s):  
Standard Model ◽  
Particle Physics ◽  
Space Time ◽  
Additional Dimension ◽  
The Earth ◽  
The Standard Model ◽  
The Universe

Put simply, Lisa Randall’s job is to figure out how the universe works, and what it’s made of. Her contributions to theoretical particle physics include two models of space-time that bear her name. The first Randall–Sundrum model addressed a problem with the Standard Model of the universe, and the second concerned the possibility of a warped additional dimension of space. In this work, we caught up with Randall to talk about why she chose a career in physics, where she finds inspiration, and what advice she’d offer budding physicists. This article has been edited for clarity. My favourite quote in this interview is, “Figure out what you enjoy, what your talents are, and what you’re most curious to learn about.” If you insterest in her work, you can contact her on Twitter @lirarandall.

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