On the validity of the strong equivalence principle for charged particles in a Schwarzschild space-time

1986 ◽  
Vol 18 (11) ◽  
pp. 1111-1126 ◽  
Author(s):  
Franco Piazzese ◽  
Guido Rizzi
Keyword(s):  
Equivalence Principle ◽  
Charged Particles ◽  
Space Time ◽  
Strong Equivalence Principle

scholarly journals SPACE–TIME FOAM MAY VIOLATE THE PRINCIPLE OF EQUIVALENCE

2004 ◽  
Vol 19 (26) ◽  
pp. 4413-4430 ◽  
Author(s):  
JOHN ELLIS ◽  
NICK E. MAVROMATOS ◽  
DIMITRI V. NANOPOULOS ◽  
ALEXANDER S. SAKHAROV
Keyword(s):  
Quantum Gravity ◽  
Equivalence Principle ◽  
Lorentz Invariance ◽  
Charged Particles ◽  
Energetic Particles ◽  
Space Time ◽  
Principle Of Equivalence ◽  
Brane Model ◽  
Different Types ◽  
Higher Genus

The interactions of different particle species with the foamy space–time fluctuations expected in quantum gravity theories may not be universal, in which case different types of energetic particles may violate Lorentz invariance by varying amounts, violating the equivalence principle. We illustrate this possibility in two different models of space–time foam based on D-particle fluctuations in either flat Minkowski space or a stack of intersecting D-branes. Both models suggest that Lorentz invariance could be violated for energetic particles that do not carry conserved charges, such as photons, whereas charged particles such electrons would propagate in a Lorentz-inavariant way. The D-brane model further suggests that gluon propagation might violate Lorentz invariance, but not neutrinos. We argue that these conclusions hold at both the tree (lowest-genus) and loop (higher-genus) levels, and discuss their implications for the phenomenology of quantum gravity.

Stability of trajectories in Ernst space–time

1986 ◽  
Vol 64 (11) ◽  
pp. 1455-1457 ◽  
Author(s):  
K. D. Krori ◽  
Ranjana Choudhury ◽  
J. C. Sarmah
Keyword(s):  
Equatorial Plane ◽  
Charged Particles ◽  
Space Time ◽  
Neutral Particles

In this paper we show that stable trajectories of charged particles, neutral particles, photons, and tachyons occur in the equatorial plane of the Ernst space–time. We also present typical bound trajectories of these particles in the equatorial plane (θ = π/2) as well as on an r = constant surface.

Sign in / Sign up

Export Citation Format

Share Document