What is quantum gravity?
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Quantum gravity is the field of theoretical physics attempting to unify quantum mechanics, which describes three of the fundamental forces of nature, with general relativity, the theory of the fourth fundamental force: gravity. The ultimate goal of some is a unified framework for all fundamental forces—a "theory of everything".\n\nclick here:http://en.wikipedia.org/wiki/Quantum_gravity#Overview
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At this point the big thing we're looking for is the higgs boson.  until we find that, all are ideas of what gravity is are unconfirmed.  All we can do is describe how it behaves.
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Quantum physics underpins everything, but of course you don't need to go that deeply for many practical purposes. For instance, you would not model the architecture of a building at the level of an electron.\n\nBut quantum mechanics is central to understanding and designing all semiconductor devices (not just the newer, esoteric ones), hard drives (which use quantum tunneling), chemicals that require an understanding of the chemical bond (including modelling shapes of biological molecules in the biotech iindustry).\n\nIt is behind MRI scanning, x-rays, digital cameras (a CCD is a fundamentally quantum device), nuclear energy and weapons technology.\n\nIt is essential to cosmology and understanding the stars.\n\nThe list goes on.\n\nAnd no, it is way beyond the status of a theory.
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The answer is "both" or "neither" depending on which theory you use.\nRelativity says that gravity is a bending of the fabric of space-time.  It is neither particle nor wave, but part of the geometry of the universe.\nNow, with quantum theory, and the Standard Model, gravity is a force that is carried by a particle.  Due to quantum weirdness, gravity would be both a wave and a particle, just like light is both waves and photons.
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Gravity becomes repulsive once it reaches Planck's constant, forcing it to invert. Loop quantum gravity states that there was an already collapsing universe which resulted in the "big bounce", or a Big Bang (with infinite density) and a Big Crunch. Basically, a universe only occurs between when matter expands and when it contracts.
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I guess that the simplest answer to this would be: 'Yes, everything is quantized.' However, unfortunately this is one of the biggest problems in modern physics. No-one is really sure how it should be quantized but the idea of quantized time as well as quantized space and quantized gravity is part of the elusive theory of quantum gravity
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In physics, the graviton is a hypothetical elementary particle that transmits the force of gravity in most quantum gravity systems. In order to do this, one theory posits that gravitons have to be always-attractive (gravity never pushes), work over any distance (gravity is universal) and come in unlimited numbers (to provide high strengths near stars). In quantum theory, these requirements define an even-spin (spin 2 in this case) boson with a rest mass of zero.
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Quantum mechanics is a fundamental physical theory which extends and corrects Newtonian mechanics, especially at the atomic and subatomic levels. It is the underlying framework of many fields of physics and chemistry, including condensed matter physics, quantum chemistry, and particle physics. The term quantum (Latin, "how much") refers to the discrete units that the theory assigns to certain physical quantities, such as the energy of an atom at rest.
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Very simply put, string theory (now most often called "M" theory) is an attempt to unite quantum physics with relativity; we hope that by doing so we can develop a set of equations that will tie together the four fundamental forces of nature. The direct relationship of three of those forces have been linked, but gravity so far remains the "outsider."
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Originally, it was a "fudge factor" that Planck used to explain certain phenomena in physics.\n\nAs we have matured in our understanding, it turns out to be a fundamental concept in quantum physics--don't recall its exact value, but it relates the energy of a quantum to its frequency.\n\nBelieve me, this is one TOTALLY horrible oversimplification of things, but it has a good deal of the basics...  OK, a little of the basics...
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Quantum physics seriously challenges our comfortable ideas of what we think is reality, how everything has its time and place, and how it all seems so straightfowardly logical, until you study the results of certain experiments in quantum physics.  The first reaction is always denial, the next is always, "there must be a simple, rational explanation", followed by, "the equations of quantum physics only expresses our ignorance of underlying processes".  After a while, there's the depression and the resignation, something that even Albert Einstein himself had to endure.  Many of the originators of quantum theory, including no less than  Erwin Schrodinger himself, have expressed regret and disgust on how things have turned out.  What may be illusionary, however, are our older concepts of what we take for reality, and what needs to be developed is a conceptual model that's consistent with the well established equations and findings of quantum theory.  Check "Quantum Interpretations", a subject that's been discussed since the early days of quantum physics.
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In VERY short...General Relativity states that energy and mass are directly related to each other and actually convert in form between each other.\nThe other basic point is the idea that space and time are exactly the same thing...and that a mass will displace the very space its in, curving the properties of space...which results in the phenomenon of gravity.\nIt also declares light-speed to be the "cosmic speedlimit"...nothing can go faster.\nString theory is the closest thing we have to unifying QM and General Relativity....as of yet, not proven.
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hmm....by power I'm pretty sure you are just asking what causes the "attractive force" of gravity? .... the short answer is that matter itself (objects with mass) impose a curvature on the surrounding spacetime which we feel as the attractive force of gravity. \n\nThe more complicated answer is that a quantam theory of gravity would have to be eventually discovered as to make gravity consistent with the other three forces now explained by quantum mechanics..(electromagnetic, weak, strong). Each one of these forces is mediated by an associated particle (electromagnetic- photon, weak-w boson, strong- gluon). The problem is that at the current time no one has ever found the theorized graviton which would be the force mediator for gravity. It has also been speculated that the idea of "mass" is itself mediated by a particle known as the Higgs Boson. This particle along with the graviton would go a long way to explain the most familiar force in our daily lives... but the most mysterious as far as science is concerned.
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In addition to Professer Beatz's answer it is good to note that it is believed that the gravitational force interacts via the graviton.  The graviton is a hypothetical elementary particle that transmits the force of gravity in most quantum gravity systems. In order to do this, one theory posits that gravitons have to be always-attractive (gravity never pushes), work over any distance (gravity is universal) and come in unlimited numbers (to provide high strengths near stars). In quantum theory, these requirements define an even-spin (spin 2 in this case) boson with a rest mass of zero.  However, to date the graviton's existence is yet to be discovered by experiment.\n\nGravitons are postulated simply because quantum theory has been so successful in other fields. For instance, the electromagnetic interaction can be very well explained by the application of quantization to photons, a science known as quantum electrodynamics. In this case photons are being continually created and destroyed by all charged particles, and the interactions between these photons produce the familiar effects of electricity and magnetism. In the same way, the strong nuclear force and the weak nuclear force are mediated by gluons and by W and Z bosons, respectively.
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Anew theory of gravity as well as a unified field theory (UFT) are being proposed, showing how the four force fields work together, implicating also a fifth field. A main feature of this new model is the proposal of the existence of diallel, gravitational-field lines that emanate from every entity. For the earth, for example, they emanate radially from its center. These diallel lines provide a conduit for combined particle and wave flow and exchange beyond the speed of light, and they have quantum states similar to the atom. On the web site, we present a general field equation showing the importance of energy density in this new UFT. We also present a new gravitational force equation, that has as a special case the commonly accepted gravitational equation.
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The focus in the 21st century for the forefront of physics is understand the connection between General Relativity and Quantum Mechanics. No question about this. The results could be a string theory, or loop gravity, or something completely different.\n\nAlso up there I think is a better understanding of a property we all know and love: mass. There is a search for the Higgs Boson. We need to find it and study it. Or, if it can't be observed try and determine what that means.\n\nOther challengs include being able to use the EPR phenomena of quantum entanglement to produce the first prototypes of an actual encrypted signal over a reasonable distance.\n\nNanotechnology is another challengs, in how to work those little parts into ways that form mini-computers, and also in ways that allow for various medical uses.
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Well if gravity is what Einstein said it is=Curvature of space time.\nThan you are going to find some space time and uncurve it!\nThis would be anti-Gravity.