Results 1  10
of
1,784,509
Nonsingular Cosmology and Planck Scale Physics
, 1995
"... New Planck scale physics may solve the singularity problems of classical general relativity and may lead to interesting consequences for very early Universe cosmology. Two approaches to these questions are reviewed in this article. The first is an effective action approach to including the effects o ..."
Abstract

Cited by 2 (0 self)
 Add to MetaCart
New Planck scale physics may solve the singularity problems of classical general relativity and may lead to interesting consequences for very early Universe cosmology. Two approaches to these questions are reviewed in this article. The first is an effective action approach to including the effects
PlanckScale Physics and the PecceiQuinn Mechanism
, 1992
"... Globalsymmetry violating higherdimension operators, expected to be induced by Planckscale physics, in general drastically alter the properties of the axion field associated with the PecceiQuinn solution to the strongCP problem, and render this solution unnatural. The particle physics and cosmol ..."
Abstract

Cited by 1 (0 self)
 Add to MetaCart
Globalsymmetry violating higherdimension operators, expected to be induced by Planckscale physics, in general drastically alter the properties of the axion field associated with the PecceiQuinn solution to the strongCP problem, and render this solution unnatural. The particle physics
Planckscale physics: Facts and belief
 Foundations of Science
, 2006
"... The relevance of the Planck scale to a theory of quantum gravity has become a worryingly little examined assumption that goes unchallenged in the majority of research in this area. However, in all scientific honesty, the significance of Planck’s natural units in a future physical theory of spacetime ..."
Abstract

Cited by 3 (1 self)
 Add to MetaCart
The relevance of the Planck scale to a theory of quantum gravity has become a worryingly little examined assumption that goes unchallenged in the majority of research in this area. However, in all scientific honesty, the significance of Planck’s natural units in a future physical theory
SEEING PLANCK SCALE PHYSICS AT ACCELERATORS
, 1997
"... Much current theoretical analysis is based on the hypothesis that the physics beyond the Standard Model is a consequence of new principles that occur at the Planck scale. The question arises whether such principles can ever be directly tested. We show here that for a significant class of models, hyp ..."
Abstract
 Add to MetaCart
Much current theoretical analysis is based on the hypothesis that the physics beyond the Standard Model is a consequence of new principles that occur at the Planck scale. The question arises whether such principles can ever be directly tested. We show here that for a significant class of models
PLANCKSCALE PHYSICS AND NEUTRINO MASSES
, 1992
"... We discuss gravitationally induced masses and mass splittings of Majorana, ZeldovichKonopinskiMahmoud and Dirac neutrinos. Among other implications, these effects can provide a solution of the solar neutrino puzzle. In particular, we show how this may work in the 17 keV neutrino picture. ..."
Abstract
 Add to MetaCart
We discuss gravitationally induced masses and mass splittings of Majorana, ZeldovichKonopinskiMahmoud and Dirac neutrinos. Among other implications, these effects can provide a solution of the solar neutrino puzzle. In particular, we show how this may work in the 17 keV neutrino picture.
Eikonal Approach To Planck Scale Physics
"... We consider gravitational scattering of point particles with Planckian centreofmass energy and fixed low momentum transfers in the framework of general relativity and dilaton gravity. The geometry around the particles are modelled by arbitrary black hole metrics of general relativity to calculate ..."
Abstract
 Add to MetaCart
We consider gravitational scattering of point particles with Planckian centreofmass energy and fixed low momentum transfers in the framework of general relativity and dilaton gravity. The geometry around the particles are modelled by arbitrary black hole metrics of general relativity to calculate the scattering amplitudes. However, for dilaton gravity, this modelling can be done only by extremal black hole metrics. This is consistent with the conjecture that extremal black holes are elementary particles. 1 email: saurya@imsc.ernet.in After the early preparatory years, my scientific work has followed a certain pattern motivated, principally, by a quest after perspectives. In practice, this quest has consisted in my choosing (after some trials and tribulations) a certain area which appears amenable to cultivation and compatible with my taste, abilities, and temperament. And when after some years of study, I feel that I have accumulated a sufficient body of knowledge and achieved a ...
Probing Planckscale physics with Extragalactic Sources?
, 2003
"... At Planckscale, spacetime is “foamy ” due to quantum fluctuations predicted by quantum gravity. Here we consider the possibility of using spacetime foaminduced phase incoherence of light from distant galaxies and gammaray bursters to probe Planckscale physics. In particular, we critically examin ..."
Abstract

Cited by 4 (0 self)
 Add to MetaCart
At Planckscale, spacetime is “foamy ” due to quantum fluctuations predicted by quantum gravity. Here we consider the possibility of using spacetime foaminduced phase incoherence of light from distant galaxies and gammaray bursters to probe Planckscale physics. In particular, we critically
CPT Violation from Planck Scale Physics
 in Proc. Workshop on K Physics, ed. L. IconomidouFayard, (Edition Frontières, 1997) 413; A. Kostelecky, “CPT Strings and Neutral Meson Systems”, ibid
"... I address the phenomenology of CPT violation in the neutral kaon system under the assumption that it originates from Planck scale physics. This assumption opens the door to a new set of CPT violating parameters whose phenomenology is distinct from the ∆ parameter usually considered in the Hamiltonia ..."
Abstract

Cited by 2 (0 self)
 Add to MetaCart
I address the phenomenology of CPT violation in the neutral kaon system under the assumption that it originates from Planck scale physics. This assumption opens the door to a new set of CPT violating parameters whose phenomenology is distinct from the ∆ parameter usually considered
HigherDimensional Algebra and PlanckScale Physics
 IN PHYSICS MEETS PHILOSOPHY AT THE PLANCK LENGTH
, 1999
"... This is a nontechnical introduction to recent work on quantum gravity using ideas from higherdimensional algebra. We argue that reconciling general relativity with the Standard Model requires a `backgroundfree quantum theory with local degrees of freedom propagating causally'. We describe ..."
Abstract

Cited by 24 (4 self)
 Add to MetaCart
This is a nontechnical introduction to recent work on quantum gravity using ideas from higherdimensional algebra. We argue that reconciling general relativity with the Standard Model requires a `backgroundfree quantum theory with local degrees of freedom propagating causally'. We describe the insights provided by work on topological quantum field theories such as quantum gravity in 3dimensional spacetime. These are backgroundfree quantum theories lacking local degrees of freedom, so they only display some of the features we seek. However, they suggest a deep link between the concepts of `space' and `state', and similarly those of `spacetime' and `process', which we argue is to be expected in any backgroundfree quantum theory. We sketch how higherdimensional algebra provides the mathematical tools to make this link precise. Finally, we comment on attempts to formulate a theory of quantum gravity in 4dimensional spacetime using `spin networks' and `spin foams'.
Probing planckscale physics with quantum optics
 Nat. Phys
, 2012
"... One of the main challenges in physics today is to merge quantum theory and the theory of general relativity into a unified framework. Various approaches towards developing such a theory of quantum gravity are pursued, but the lack of experimental evidence of quantum gravitational effects thus far i ..."
Abstract

Cited by 13 (1 self)
 Add to MetaCart
relation even at the Planck scale. We show that the scheme is within reach of current technology. It thus opens a feasible route for tabletop experiments to test possible quantum gravitational phenomena. The ongoing search for a quantum theory of gravity is one of the main challenges in modern physics. A
Results 1  10
of
1,784,509