However, certain physical phenomena, such as singularities, are " very small " spatially yet are " very large " from a mass or energy perspective ; such objects cannot be understood with current theories of quantum mechanics or general relativity, thus motivating the search for a quantum theory of gravity.

The general approach to deriving a quantum gravity theory that is valid at even the highest energy scales is to assume that such a theory will be simple and elegant and, accordingly, to study symmetries and other clues offered by current theories that might suggest ways to combine them into a comprehensive, unified theory.

On Earth, with its relatively strong gravity, current technology is not capable of manufacturing tether materials that are sufficiently strong and light to build a space elevator.

Such a large mass is too large to have accumulated since the Big Bang using current models and may indicate that gravity falls off slower than inverse-squared at certain distance scales.

For example, one can apply the current understanding of grand unified theories ( GUT's-both quasi-classical, such as general relativity, and modern, such as quantum gravity, superstring, and M-theories ) to these three primary cosmogonic paradoxes in thought experiments.

In general relativity, the symmetric stress-energy tensor acts as the source of spacetime curvature, and is the current density associated with gauge transformations of gravity which are general curvilinear coordinate transformations.

The control rods are held by electromagnets and fall by gravity when current is lost ; full insertion safely shuts down the primary nuclear reaction.

While there has been a recent proposal relating to observation of naked singularities, and doubly special relativity, as a part of a program called loop quantum cosmology, as of now there is no experimental observation for which loop quantum gravity makes a prediction not made by the Standard Model or general relativity ( a problem that plagues all current theories of quantum gravity ).

Thus, to enter an orbit passing over the poles of the Sun, the spacecraft would have to eliminate the 30 km / s speed it inherited from the Earth's orbit around the Sun and gain the speed needed to orbit the Sun in the pole-to-pole plane — tasks that are impossible with current spacecraft propulsion systems alone, making gravity assist maneuvers essential.

A Hohmann transfer to Saturn would require a total of 15. 7 km / s delta V ( disregarding Earth's and Saturn's own gravity wells, and disregarding aerobraking ), which is not within the capabilities of current launch vehicles and spacecraft propulsion systems.

At temperatures greater than or equal to T < sub > P </ sub >, current physical theory breaks down because we lack a theory of quantum gravity.

For energies approaching the Planck scale, a new theory of quantum gravity is required, and the current leading approaches are string theory and M-theory.

A pyroclastic flow is a type of gravity current ; in scientific literature they are sometimes abbreviated to PDC ( pyroclastic density current ).

Any alternative theory of gravity would imply immediately an alternative cosmological theory since current modeling is dependent on general relativity as a framework assumption.

In October 2003, the Prime Minister of Japan responded to an inquiry from a member of the House of Representatives of Japan stating that, while the current Japanese government does not possess any records related to Unit 731, they recognize the gravity of the matter and will publicize any records that are located in the future.

Loop quantum gravity ( LQG ), in its current formulation, predicts no additional spatial dimensions, nor anything else about particle physics.

The current consensus of astrophysicists is instead that Einstein's theory of general relativity, a theory of gravity, explains the origin and evolution of the universe on cosmic scales.

A mercury switch ( also known as a mercury tilt switch ) is a switch whose purpose is to allow or interrupt the flow of electric current in an electrical circuit in a manner that is dependent on the switch's physical position or alignment relative to the direction of the " pull " of earth's gravity, or other inertia.

This can be obtained either by calibrating the device at rest, or from a known model of gravity at the approximate current position.

Otherwise, the particles ' position and other characteristics are advanced based on a physical simulation, which can be as simple as translating their current position, or as complicated as performing physically accurate trajectory calculations which take into account external forces ( gravity, friction, wind, etc .).

For example, the leading edge of a gravity current moves with a front Froude number of about unity.

In fluid dynamics, a gravity current is a primarily horizontal flow in a gravitational field that is driven by a density difference, hence gravity currents also sometimes being referred to as " density currents ".

Sprinkel strongly refuted the current neo-stagnationist thesis that we are facing a future of limited and slow growth, declaring that this pessimism `` is based on very limited and questionable evidence ''.

direct current | DC plasma physics | plasma ( violet ) enhances the growth of carbon nanotubes in laboratory-scale PECVD apparatus

If the current trends continue, some population growth can be foreseen for the coming years.

IGAR models can be used to impute expected changes in growth from current P / E and historical growth rates for the stocks relative to a comparison index.

Predicting the rapid growth northward on Manhattan Island, Astor purchased more and more land beyond the current city limits.

Latvia's economy experienced GDP growth of more than 10 % per year during 2006-07, but entered a severe recession in 2008 as a result of an unsustainable current account deficit and large debt exposure amid the softening world economy.

* starvation ( density-dependent mortality ) where the growth rate will decrease at a rate proportional to the value obtained by taking the theoretical " carrying capacity " of the environment less the current population.

A deterioration in the merchandise trade balance due to strong import growth has been offset by improvements in net income and transfers, with a small improvement in the current account deficit to 12 percent of GDP.

By May 1969 Britain ’ s current account position was in surplus, thanks to a growth in exports, a drop in overall consumption and, in part, the Inland Revenue correcting a previous underestimation in export figures.

The long-term potential growth rate of South Africa under the current policy environment has been estimated at 3. 5 %.

Other misconceptions such as: " the Church prohibited autopsies and dissections during the Middle Ages ," " the rise of Christianity killed off ancient science ," and " the medieval Christian church suppressed the growth of the natural sciences ," are all reported by Numbers as examples of widely popular myths that still pass as historical truth, even though they are not supported by current historical research.

Broadly defined, the sustainable development mantra enjoins current generations to take a systems approach to growth and development and to manage natural, produced, and social capital for the welfare of their own and future generations.

While current first world countries polluted significantly during their development, the same countries encourage third world countries to reduce pollution, which sometimes impedes growth.

Plutarch provides the most evocative version of this story: But when Egypt revolted with Athenian aid ... and Cimon's mastery of the sea forced the King to resist the efforts of the Hellenes and to hinder their hostile growth ... messages came down to Themistocles saying that the King commanded him to make good his promises by applying himself to the Hellenic problem ; then, neither embittered by anything like anger against his former fellow-citizens, nor lifted up by the great honor and power he was to have in the war, but possibly thinking his task not even approachable, both because Hellas had other great generals at the time, and especially because Cimon was so marvelously successful in his campaigns ; yet most of all out of regard for the reputation of his own achievements and the trophies of those early days ; having decided that his best course was to put a fitting end to his life, he made a sacrifice to the gods, then called his friends together, gave them a farewell clasp of his hand, and, as the current story goes, drank bull's blood, or as some say, took a quick poison, and so died in Magnesia, in the sixty-fifth year of his life ... They say that the King, on learning the cause and the manner of his death, admired the man yet more, and continued to treat his friends and kindred with kindness.

The logging industry cut down large swaths of old growth, and most of the current growth is younger native forest ( around 150, 000 kauri seedlings were planted by the New Zealand Forest Service in the 1970s and 1980s ) as well as some remaining kauri in the far north of the island.

A business plan for a project requiring equity financing will need to explain why current resources, upcoming growth opportunities, and sustainable competitive advantage will lead to a high exit valuation.

The NTM is a metastable mode ; in certain plasma configurations, a sufficiently large deformation of the bootstrap current produced by a “ seed island ” can contribute to the growth of the island.

In Africa, if current trends of population growth and soil degradation continue, the continent might

There is still some debate on whether the current ( 2006 ) growth levels are in part due to the devaluation of the Krona.

One of the current debates in the Tri-City area is whether to try to maintain a small-town-feel or to embrace its growth and become a larger metropolitan area.

* Exponential growth, where the growth rate of a mathematical function is proportional to the function's current value