scholarly journals Loop quantum gravity phenomenology and the issue of Lorentz invariance

2005 ◽  
Vol 71 (8) ◽  
Author(s):  
Martin Bojowald ◽  
Hugo A. Morales-Técotl ◽  
Hanno Sahlmann
Keyword(s):  
Quantum Gravity ◽  
Loop Quantum Gravity ◽  
Lorentz Invariance ◽  
Quantum Gravity Phenomenology

MSW Effect in Loop Quantum Gravity and Constraints on Parameters from Neutrino–Antineutrino Transitions

2003 ◽  
Vol 18 (20) ◽  
pp. 1397-1401
Author(s):  
G. Lambiase
Keyword(s):  
Dispersion Relation ◽  
Quantum Gravity ◽  
Loop Quantum Gravity ◽  
Lorentz Invariance ◽  
Spin Flip

The MSW effect is studied in the context of loop quantum gravity. In this theory the dispersion relation of fermion depends on the helicity of particles. Bounds on parameters related to helicity-terms, which violate the Lorentz invariance, are derived in the framework of spin-flip conversion of neutrino flavors.

scholarly journals PERSPECTIVES ON QUANTUM GRAVITY PHENOMENOLOGY

2005 ◽  
Vol 14 (12) ◽  
pp. 2069-2094 ◽  
Author(s):  
DANIEL SUDARSKY
Keyword(s):  
Quantum Gravity ◽  
Lorentz Invariance ◽  
Quantum Gravity Phenomenology ◽  
Violation Of Lorentz Invariance

The idea that quantum gravity manifestations are associated with a violation of Lorentz invariance is very strongly bounded and faces serious theoretical challenges. Other related ideas seem to be drowning in interpretational quagmires. This leads us to consider alternative lines of thought for such a phenomenological search. We discuss the underlying viewpoints and briefly mention their possible connections with other current theoretical ideas.

scholarly journals QUANTUM GRAVITY PHENOMENOLOGY, LORENTZ INVARIANCE AND DISCRETENESS

2004 ◽  
Vol 19 (24) ◽  
pp. 1829-1840 ◽  
Author(s):  
FAY DOWKER ◽  
JOE HENSON ◽  
RAFAEL D. SORKIN
Keyword(s):  
Phase Space ◽  
Cosmic Rays ◽  
Quantum Gravity ◽  
Phenomenological Model ◽  
Lorentz Invariance ◽  
Minkowski Spacetime ◽  
High Energy ◽  
High Energy Cosmic Rays ◽  
Quantum Gravity Phenomenology ◽  
Massive Particles

Contrary to what is often stated, a fundamental spacetime discreteness need not contradict Lorentz invariance. A causal set's discreteness is in fact locally Lorentz invariant, and we recall the reasons why. For illustration, we introduce a phenomenological model of massive particles propagating in a Minkowski spacetime which arises from an underlying causal set. The particles undergo a Lorentz invariant diffusion in phase space, and we speculate on whether this could have any bearing on the origin of high energy cosmic rays.

scholarly journals Emergence of stringlike physics from Lorentz invariance in loop quantum gravity

2014 ◽  
Vol 23 (12) ◽  
pp. 1442023 ◽  
Author(s):  
Rodolfo Gambini ◽  
Jorge Pullin
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
String Theory ◽  
Quantum Gravity ◽  
Loop Quantum Gravity ◽  
Lorentz Invariance ◽  
Spherically Symmetric ◽  
Quantum Field ◽  
Spin Network ◽  
Symmetric Quantum

We consider a quantum field theory on a spherically symmetric quantum spacetime described by loop quantum gravity. The spin network description of spacetime in such a theory leads to equations for the quantum field that are discrete. We show that to avoid significant violations of Lorentz invariance, one needs to consider specific nonlocal interactions in the quantum field theory similar to those that appear in string theory. This is the first sign that loop quantum gravity places restrictions on the type of matter considered, and points to a connection with string theory physics.

scholarly journals TOWARDS A NEW APPROACH TO QUANTUM GRAVITY PHENOMENOLOGY

2005 ◽  
Vol 14 (10) ◽  
pp. 1685-1698 ◽  
Author(s):  
ALEJANDRO CORICHI ◽  
DANIEL SUDARSKY
Keyword(s):  
Quantum Gravity ◽  
Lorentz Invariance ◽  
New Approach ◽  
Experimental Search ◽  
Quantum Gravity Phenomenology ◽  
Violation Of Lorentz Invariance

The idea that quantum gravity manifestations would be associated with a violation of Lorentz invariance is very strongly bounded and faces serious theoretical challenges. This leads us to consider an alternative line of thought for such phenomenological search. We discuss the underlying viewpoint and briefly mention its possible connections with current theoretical ideas. We also outline the challenges that the experimental search of the effects would seem to face.

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