scholarly journals Preferred-frame effects, the $$H_0$$ tension, and probes of Hořava–Lifshitz gravity

2020 ◽  
Vol 135 (4) ◽  
Author(s):  
Nils A. Nilsson
Keyword(s):  
Preferred Frame

scholarly journals CONSTRAINING THE PREFERRED-FRAME α1, α2 PARAMETERS FROM SOLAR SYSTEM PLANETARY PRECESSIONS

2014 ◽  
Vol 23 (01) ◽  
pp. 1450006 ◽  
Author(s):  
L. IORIO
Keyword(s):  
Binary System ◽  
Solar System ◽  
Relative Motion ◽  
A Priori ◽  
The Other ◽  
Preferred Frame ◽  
General Relativistic ◽  
Ppn Parameters ◽  
Invariable Plane ◽  
Analytical Expressions

Analytical expressions for the orbital precessions affecting the relative motion of the components of a local binary system induced by Lorentz-violating Preferred Frame Effects (PFE) are explicitly computed in terms of the Parametrized Post-Newtonian (PPN) parameters α1, α2. Preliminary constraints on α1, α2 are inferred from the latest determinations of the observationally admitted ranges [Formula: see text] for any anomalous Solar System planetary perihelion precessions. Other bounds existing in the literature are critically reviewed, with particular emphasis on the constraint [Formula: see text] based on an interpretation of the current close alignment of the Sun's equator with the invariable plane of the Solar System in terms of the action of a α2-induced torque throughout the entire Solar System's existence. Taken individually, the supplementary precessions [Formula: see text] of Earth and Mercury, recently determined with the INPOP10a ephemerides without modeling PFE, yield α1 = (0.8±4) × 10-6 and α2 = (4±6) × 10-6, respectively. A linear combination of the supplementary perihelion precessions of all the inner planets of the Solar System, able to remove the a priori bias of unmodeled/mismodeled standard effects such as the general relativistic Lense–Thirring precessions and the classical rates due to the Sun's oblateness J2, allows to infer α1 = (-1 ± 6) × 10-6, α2 = (-0.9 ± 3.5) × 10-5. Such figures are obtained by assuming that the ranges of values for the anomalous perihelion precessions are entirely due to the unmodeled effects of α1 and α2. Our bounds should be improved in the near-mid future with the MESSENGER and, especially, BepiColombo spacecrafts. Nonetheless, it is worthwhile noticing that our constraints are close to those predicted for BepiColombo in two independent studies. In further dedicated planetary analyses, PFE may be explicitly modeled to estimate α1, α2 simultaneously with the other PPN parameters as well.

scholarly journals Testing for preferred-frame effects in gravity with artificial earth satellites

1994 ◽  
Vol 49 (4) ◽  
pp. 1693-1706 ◽  
Author(s):  
Thibault Damour ◽  
Gilles Esposito-Farèse
Keyword(s):  
Preferred Frame ◽  
Artificial Earth Satellites ◽  
Artificial Earth

The Earth's Surface Is a Preferred Frame in Zeeman's Experiments

1994 ◽  
Vol 7 (4) ◽  
pp. 396-402
Author(s):  
Józef Wilczyński
Keyword(s):  
Preferred Frame

Time dilation in the GPS invalidates the relativity principle

2020 ◽  
Vol 33 (3) ◽  
pp. 302-305 ◽  
Author(s):  
Stephan J. G. Gift
Keyword(s):  
Special Relativity ◽  
Global Positioning System ◽  
Time Dilation ◽  
Positioning System ◽  
Relativity Principle ◽  
Preferred Frame ◽  
Global Positioning

Asymmetrical time dilation in the Global Positioning System (GPS) invalidates the relativity principle of special relativity since it confirms the existence of a preferred frame that is prohibited by the principle. It also contradicts symmetrical time dilation predicted by special relativity.

scholarly journals A lower bound for the velocity of quantum communications in the preferred frame

2011 ◽  
Vol 375 (3) ◽  
pp. 379-384 ◽  
Author(s):  
B. Cocciaro ◽  
S. Faetti ◽  
L. Fronzoni
Keyword(s):  
Lower Bound ◽  
Quantum Communications ◽  
Preferred Frame

scholarly journals DISCRETENESS WITHOUT SYMMETRY BREAKING: A THEOREM

2009 ◽  
Vol 24 (32) ◽  
pp. 2579-2587 ◽  
Author(s):  
LUCA BOMBELLI ◽  
JOE HENSON ◽  
RAFAEL D. SORKIN
Keyword(s):  
Symmetry Breaking ◽  
Lorentz Invariance ◽  
Minkowski Spacetime ◽  
Dispersion Relations ◽  
Poisson Processes ◽  
Discrete Structure ◽  
Preferred Frame ◽  
Modified Dispersion Relations ◽  
Measurable Map

This paper concerns random sprinklings of points into Minkowski spacetime (Poisson processes). It proves that there exists no equivariant measurable map from sprinklings to spacetime directions (even locally). Therefore, if a discrete structure is associated to a sprinkling in an intrinsic manner, then the structure will not pick out a preferred frame, locally or globally. This implies that the discreteness of a sprinkled causal set will not give rise to "Lorentz breaking" effects like modified dispersion relations. Another consequence is that there is no way to associate a finite-valency graph to a sprinkling consistently with Lorentz invariance.

scholarly journals NewCP-Violation and Preferred-Frame Tests with Polarized Electrons

2006 ◽  
Vol 97 (2) ◽  
Author(s):  
B. R. Heckel ◽  
C. E. Cramer ◽  
T. S. Cook ◽  
E. G. Adelberger ◽  
S. Schlamminger ◽  
...  
Keyword(s):  
Polarized Electrons ◽  
Preferred Frame
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