Scientists Think Gravity Isn’t Just a Force—It’s an Untapped Quantum Field
Scientists have proposed a new test to hopefully help shed some light on
quantum gravity.
Gravity is the only major force in the universe that doesn’t fit into our
current quantum framework, driving the pursuit of a grand unified theory of
physics.
The new test would not be proof or a full understanding of quantum gravity,
but it would be a huge step in the right direction—if we can pull it off.
Almost all we know about the universe boils down to the rules of quantum
mechanics. Just about everything can be described as fields
(electromagnetism, the strong and weak nuclear forces) and matter, and
we’ve slowly re-built our fundamental understanding of the cosmos out of
these fundamental building blocks.
That is, except for one big, neon-green brick in the uniform, rustic wall
of physics—gravity. Gravity, as far as we have been able to prove, isn’t
quantum, even though it theoretically should be. The greatest scientific
minds in the world still don’t have a quantum description of gravity,
usually just called “quantum gravity.” The best way to describe it right
now is through general relativity, and the disconnect between classical
gravity and all of our known quantum fields is the reason people continue
to feverishly search for a grand unified theory of physics. We watch
gravity and quantum fields work together, so the rules should work
together, too.
The search for the rules of quantum gravity has been a slog, but scientists
keep at it regardless, as it would truly change our understanding of… well…
everything. And according to a recent study, published in the journal
Physical Review Letters, one group of researchers has an idea regarding how
to test for the existence of gravity in the quantum realm.
The proposal stems from the idea that instead of trying to prove purely
quantum gravity, we could at least disprove purely classical gravity by
showing that the measurement of this force follows at least one quantum
rule: superposition. The scientists suggest creating a teeny-tiny crystal
(we’re talking only nanometers in size) and placing it into a state of
superposition—a quantum state where an object (usually a particle) is in
two places at once until it is measured.
Now, superposition has been used to test for quantum gravity, but the
authors of this new paper argue that observation of the phenomenon isn’t
enough. “As quantum mechanics is not defined by the superposition principle
alone, but also requires the unitarity of evolution and the measurement
postulate,” the authors wrote. “Witnessing entanglement […] will imply that
gravity is described either by quantum mechanics, or by a (unknown)
nonclassical theory *that obeys superposition principle.* To know whether
gravity is indeed quantum, we need to test other quantum mechanical
postulates for gravity.” {KR: THE SUPER POSITION AKIN TO QUANTUM FIELD IS
ACCEPTIBLE IN SCIENCE; BUT WHERE ADISHANKARA WROTE EGO IS SUPERIMPOSED OVER
SOUL, AND WHEN THAT SUPER POSITION IS ALTERED, REMOVING THE VEIL OF EGO,
SOUL IS REVEALED WHICH IS THE CONSCIOUSNESS-BRAHMAM}
So, they decided to go a step farther—but they still intend to start with
superposition. Once the superposition state has been induced, two paths are
to be followed. On the first path, to set up a kind of control group, the
crystal in the superposition state is measured and its final state
recorded. On the second path, another nanocrystal is brought into the mix
close enough to the first that there should be a very weak gravitational
force between the two crystals.
The gravity of that second crystal should (in theory) be felt by the first
crystal in the superposition. According to a research highlight write-up in
the journal Nature, that behavior “would effectively ‘measure’ the mass of
the first [crystal].” Then, the researchers would measure that first
crystal again and see if its final state was different from when it was
measured pre-second-crystal intervention—an effect caused by a phenomenon
known as ‘quantum measurement-induced disturbance,’ which only happens if
quantum effects are at play.
According to Nature, if the state is in fact different, it would be “a
first proof that gravity does indeed have a quantum nature.” It’s
complicated, it’s never been done, it’s incredibly cutting-edge, and it is
(critically) not the full theory of quantum gravity that we eventually hope
to decode. As the authors wrote in the paper, “adding this test to
[existing tests of superposition’s effects on gravity] will take us towards
a more complete demonstration of gravity as a quantum entity.
KR WHERE THE GRAVITATION IS NOT ONLY A FOCE BUT ALSO A QUANTUM FIELD, WHERE
IF QUANTUM ALSO, THEN GRAVITATION IS IN THE NATURE OF QUANTUM.
Some properties of quantum fields include:
Ultraviolet divergences
The ultraviolet (UV) cutoff in a quantum field theory (QFT) can break or
conserve the Poincare (translation) symmetry and the gauge symmetry.
Quantum entanglement
A fundamental property of quantum mechanics that allows two particles to
remain linked, regardless of the distance between them. This property is
used in quantum communications and cryptography.
Quantum field theory in curved spacetime (QFTCS)
The theory of quantum fields propagating in a curved spacetime.
Renormalization group
A formulation in terms of field integrals is used to study the properties
of QFT.
Heisenberg Uncertainty principle
A fundamental property of quantum systems that states that the more
precisely the position of a particle is determined, the less precisely its
momentum can be known.
Particles are waves, and vice versa
Quantum particles have properties of both waves and particles. The energy
of a quantum wave is proportional to its frequency rather than to its
amplitude
Hence Gravitation- akarshana, was not treated only as a force in vedic
verses and by Rishi Kanada, might be accepted by west some time later. Rig
vedam says that the Sun has tied all the planets around in the movements,
which denoted the quantum entanglement, whatever be the distance from the
SUN, happening simultaneously in both the places.
K Rajaram IRS 151124
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