Subject: Reason for gravitational force
Posted by: Injustice_god
Date: Jun 30 16
We have read that a body that has mass always exerts an attractive force on other body. But was is the reason and cause if this force.
Posted by: Injustice_god
Date: Jun 30 16
We have read that a body that has mass always exerts an attractive force on other body. But was is the reason and cause if this force.
4 replies. On page 1 of 1 pages. 1
albert11 
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I'm no cosmologist but I do read a lot on this subject. I'm afraid we don't know enough about gravity to fully understand it yet. Dark energy has mass and is thought to cause the exact opposite of gravity- nobody knows why because we can't study dark energy from our tiny rock in space. I've recently thought that gravity indicates a higher dimension of space-time, which is why it's so hard to detect the graviton (gravity's theoretical particle of force, like electromagnetism's electron). Reply #1. Jun 30 16, 2:39 AM |
brm50diboll
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Of the four fundamental forces in physics (gravity, the electromagnetic force, the strong nuclear force, and the weak nuclear force), gravity is the most difficult to reconcile with the other forces. Quantum mechanical theory has successfully "united" the other three fundamental forces in a unified theory known presently as The Standard Model. Our best current description of gravity is Einstein's General Theory of Relativity, which states that space-time is warped by the presence of a gravitational field produced by matter. Einstein spent the last twenty years of his life trying unsuccessfully to "unite" gravity with the other forces in a "Grand Unified Theory". But the mathematics of General Relativity are incompatible with the mathematics of Quantum Mechanics. Einstein himself had serious problems with quantum mechanics, famously stating "God does not play dice." But physicists working on this problem today believe that a successful "Grand Unified Theory" will require a working quantum theory of gravity. The Highs boson (aka "The God Particle" - as so dubbed by Leon Lederman) was discovered by the Large Hadron Collider at CERN in 2013. The Higgs is believed to impart mass onto other particles, and mass produces gravity by a hypothetical quantum carrier called the graviton which has yet to be characterized, though gravity waves have been detected in binary neutron star systems. String and Brane theories have been proposed in an effort to unite gravity with the other forces. One idea is that gravity primarily exists in higher dimensions and only weakly "penetrates" into the four familiar dimensions of space and time that we perceive. But these String and Brane theories, while mathematically consistent, are not presently testable experimentally, which makes the underlying mathematical physics behind them more metaphysics than physics, since the scientific method demands hypotheses (and theories) be testable to be of value. There are many beautiful mathematical theories that do not represent our universe. Newton, of course, living centuries before quantum mechanics, made no pretense in attempting to explain what gravity is, just assuming it acted and describing how it acted. We want more from our theoretical physics now: we want to know what gravity "is" and "why" it works. But yeah. Gravity. It is a heavy subject. Reply #2. Apr 05 17, 10:51 PM |
Creedy
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Ask Isaac Newton :) Reply #3. Dec 17 17, 6:57 PM |
| brm50diboll
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Newton was my sort of guy. Never married, aloof, with few friends (Edmond Halley, most notably), and several enemies (Robert Hooke, Gottfried Liebniz), long-winded, boring to his students, obsessed with occult mysticism, with a strong vindictive streak - much more interesting than the sanitized version of him that is usually given out. The real Isaac Newton resembles the elementary school textbook version of him about as much as Parson Weem's "I never tell a lie, I cut down the cherry tree." version of George Washington resembles the real Washington. Great minds are often tortured souls. Reply #4. Dec 18 17, 12:11 PM |
4 replies. On page 1 of 1 pages. 1
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