scholarly journals PROBING RELATIVITY USING SPACE-BASED EXPERIMENTS

2007 ◽  
Vol 16 (12b) ◽  
pp. 2469-2480 ◽  
Author(s):  
NEIL RUSSELL
Keyword(s):  
Standard Model ◽  
Special Relativity ◽  
Planck Scale ◽  
Lorentz Violation ◽  
High Sensitivity ◽  
Standard Model Extension ◽  
Full Spectrum ◽  
Small Deviations ◽  
Model Extension ◽  
The Standard Model

An overview of space tests searching for small deviations from special relativity arising at the Planck scale is given. Potential high-sensitivity space-based experiments include ones with atomic clocks, masers, and electromagnetic cavities. We show that a significant portion of the coefficient space in the Standard Model extension, a framework that covers the full spectrum of possible effects, can be accessed using space tests. Some remarks on Lorentz violation in the gravitational sector are also given.

scholarly journals Lorentz Violation of the Photon Sector in Field Theory Models

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Lingli Zhou ◽  
Bo-Qiang Ma
Keyword(s):  
Field Theory ◽  
Standard Model ◽  
Degrees Of Freedom ◽  
Lorentz Violation ◽  
Detailed Structure ◽  
Standard Model Extension ◽  
Model Extension ◽  
The Standard Model ◽  
Minimal Standard

We compare the Lorentz violation terms of the pure photon sector between two field theory models, namely, the minimal standard model extension (SME) and the standard model supplement (SMS). From the requirement of the identity of the intersection for the two models, we find that the free photon sector of the SMS can be a subset of the photon sector of the minimal SME. We not only obtain some relations between the SME parameters but also get some constraints on the SMS parameters from the SME parameters. The CPT-odd coefficients(kAF)αof the SME are predicted to be zero. There are 15 degrees of freedom in the Lorentz violation matrixΔαβof free photons of the SMS related with the same number of degrees of freedom in the tensor coefficients(kF)αβμν, which are independent from each other in the minimal SME but are interrelated in the intersection of the SMS and the minimal SME. With the related degrees of freedom, we obtain the conservative constraints(2σ)on the elements of the photon Lorentz violation matrix. The detailed structure of the photon Lorentz violation matrix suggests some applications to the Lorentz violation experiments for photons.

scholarly journals Effects of Lorentz violation through the γe → Wνe process in the Standard Model extension

2014 ◽  
Vol 41 (5) ◽  
pp. 055003 ◽  
Author(s):  
J I Aranda ◽  
F Ramírez-Zavaleta ◽  
D A Rosete ◽  
F J Tlachino ◽  
J J Toscano ◽  
...  
Keyword(s):  
Standard Model ◽  
Lorentz Violation ◽  
Standard Model Extension ◽  
Model Extension ◽  
The Standard Model

scholarly journals NEW CHANCE FOR RESEARCHES ON LORENTZ VIOLATION

2012 ◽  
Vol 10 ◽  
pp. 195-206 ◽  
Author(s):  
BO-QIANG MA
Keyword(s):  
Field Theory ◽  
Standard Model ◽  
Effective Field Theory ◽  
Lorentz Violation ◽  
Phenomenological Analysis ◽  
Effective Field ◽  
Standard Model Extension ◽  
Model Extension ◽  
The Standard Model

I present a brief review on the motivation for the study on Lorentz violation and on some of our studies with phenomenological analysis of Lorentz violation effects. I also discuss three effective field theory frameworks for Lorentz violation: the Coleman-Glashow model, the standard model extension (SME), and the standard model supplement (SMS). The situation of the OPERA "anomaly" is also briefly reviewed, together with some discussion on the superluminality of neutrinos within the effective field theory frameworks.

scholarly journals Constraints on Space-Time-Matter Theory in the Framework of the Standard-Model Extension

Galaxies ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 26
Author(s):  
James Overduin ◽  
Hamna Ali ◽  
Francis Walz
Keyword(s):  
Standard Model ◽  
Rest Mass ◽  
Lorentz Violation ◽  
Space Time ◽  
Standard Model Extension ◽  
Matter Theory ◽  
Model Extension ◽  
The Standard Model ◽  
Klein Theory ◽  
Kaluza Klein

We use experimental limits on Lorentz violation within the framework of the Standard-Model Extension to derive quantitative constraints on Space-Time-Matter theory, a version of Kaluza–Klein theory in which the cylinder condition is relaxed so that four-dimensional physics can in principle depend on the extra coordinates. The extra dimensions are not necessarily compact or length-like. We find that the associated variation in fundamental quantities such as rest mass must occur slowly, on cosmological scales.

scholarly journals Lorentz violation and gravity

2009 ◽  
Vol 5 (S261) ◽  
pp. 409-413
Author(s):  
Quentin G. Bailey
Keyword(s):  
Standard Model ◽  
Lorentz Violation ◽  
Laser Ranging ◽  
Unified Theory ◽  
Standard Model Extension ◽  
Lunar Laser Ranging ◽  
Lunar Laser ◽  
Model Extension ◽  
The Standard Model

AbstractIn the last decade, a variety of high-precision experiments have searched for miniscule violations of Lorentz symmetry. These searches are largely motivated by the possibility of uncovering experimental signatures from a fundamental unified theory. Experimental results are reported in the framework called the Standard-Model Extension (SME), which describes general Lorentz violation for each particle species in terms of its coefficients for Lorentz violation. Recently, the role of gravitational experiments in probing the SME has been explored in the literature. In this talk, I will summarize theoretical and experimental aspects of these works. I will also discuss recent lunar laser ranging and atom interferometer experiments, which place stringent constraints on gravity coefficients for Lorentz violation.

scholarly journals Is There Any Symmetry Left in Gravity Theories with Explicit Lorentz Violation?

Symmetry ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 433 ◽  
Author(s):  
Yuri Bonder ◽  
Cristóbal Corral
Keyword(s):  
Standard Model ◽  
Lorentz Violation ◽  
The Other ◽  
Standard Model Extension ◽  
Robust Algorithm ◽  
First Order ◽  
Other Hand ◽  
Model Extension ◽  
The Standard Model ◽  
Theories Of Gravity

It is well known that a theory with explicit Lorentz violation is not invariant under diffeomorphisms. On the other hand, for geometrical theories of gravity, there are alternative transformations, which can be best defined within the first-order formalism and that can be regarded as a set of improved diffeomorphisms. These symmetries are known as local translations, and among other features, they are Lorentz covariant off shell. It is thus interesting to study if theories with explicit Lorentz violation are invariant under local translations. In this work, an example of such a theory, known as the minimal gravity sector of the Standard Model Extension, is analyzed. Using a robust algorithm, it is shown that local translations are not a symmetry of the theory. It remains to be seen if local translations are spontaneously broken under spontaneous Lorentz violation, which are regarded as a more natural alternative when spacetime is dynamic.

scholarly journals Lorentz violation, gravitoelectromagnetic field and Bhabha scattering

2018 ◽  
Vol 33 (02) ◽  
pp. 1850015 ◽  
Author(s):  
A. F. Santos ◽  
Faqir C. Khanna
Keyword(s):  
General Relativity ◽  
Standard Model ◽  
Cross Section ◽  
Particle Physics ◽  
Planck Scale ◽  
Lorentz Violation ◽  
Lorentz Symmetry ◽  
Standard Model Extension ◽  
Bhabha Scattering ◽  
The Standard Model

Lorentz symmetry is a fundamental symmetry in the Standard Model (SM) and in General Relativity (GR). This symmetry holds true for all models at low energies. However, at energies near the Planck scale, it is conjectured that there may be a very small violation of Lorentz symmetry. The Standard Model Extension (SME) is a quantum field theory that includes a systematic description of Lorentz symmetry violations in all sectors of particle physics and gravity. In this paper, SME is considered to study the physical process of Bhabha Scattering in the Gravitoelectromagnetism (GEM) theory. GEM is an important formalism that is valid in a suitable approximation of general relativity. A new nonminimal coupling term that violates Lorentz symmetry is used in this paper. Differential cross-section for gravitational Bhabha scattering is calculated. The Lorentz violation contributions to this GEM scattering cross-section are small and are similar in magnitude to the case of the electromagnetic field.

The Mansouri–Sexl formalism for the Michelson–Morley experiment in nonvacuum media

2008 ◽  
Vol 86 (12) ◽  
pp. 1417-1419
Author(s):  
A Sfarti
Keyword(s):  
Standard Model ◽  
Special Relativity ◽  
Lower Number ◽  
The Other ◽  
The Novel ◽  
Standard Model Extension ◽  
Model Extension ◽  
The Standard Model ◽  
Refractive Medium ◽  
Morley Experiment

In the present paper, we construct the complete Mansouri–Sexl formalism for the Michelson–Morley and Kennedy–Thorndike experiments executed in a refractive medium by extending their previous formalism derived for vacuum-based experiments. This is an important step since we will show that the experiments executed in a refractive medium give new possibilities for testing for Lorentz violations. In a previous paper, we developed the correct nonparametric treatment under the framework of special relativity, so no violation testing was possible. On the other hand, a parameterized theory, like that of Mansouri–Sexl is the standard way of testing for Lorentz symmetry violations. While other parameterized theories, like the Standard Model extension (SME) emerged in the late 1990s The Mansouri–Sexl formalism is still very much employed in experiments due to its relative simplicity and its lower number of parameters (three) versus the 19 parameters used in SME. This is why we are undertaking the novel step of constructing the corresponding Mansouri–Sexl formalism. Yet another novel attempt is to describe an unprecedented variation of the Kennedy–Thorndike experiment employing different refractive media for the interferometer arms. We will also demonstrate the advantages of deferring the expansion of the Mansouri–Sexl parameters a, b, and d as long as possible, thus obtaining a higher level of precision in deriving the violations.PACS No.: 03.30.+p

scholarly journals Gravity effects on antimatter in the standard-model extension

2014 ◽  
Vol 30 ◽  
pp. 1460273 ◽  
Author(s):  
Jay D. Tasson
Keyword(s):  
Field Theory ◽  
Standard Model ◽  
Lorentz Violation ◽  
Cpt Violation ◽  
Standard Model Extension ◽  
Model Extension ◽  
The Standard Model ◽  
General Field ◽  
Gravity Effects ◽  
Antimatter Gravity

The gravitational Standard-Model Extension (SME) is the general field-theory based framework for the analysis of CPT and Lorentz violation. In this work we summarize the implications of Lorentz and CPT violation for antimatter gravity in the context of the SME. Implications of various attempts to place indirect limits on anomalous antimatter gravity are considered in the context of SME-based models.

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