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Today's Top Science Headline: Gravity Haunts the Standard Model of the Universe --"Current Theory For Everything"


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Twenty-five particles and four forces. That description — the Standard Model of particle physics — constitutes physicists’ best current explanation for everything. It’s neat and it’s simple, but no one is entirely happy with it. What irritates physicists most is that one of the forces — gravity — sticks out like a sore thumb on a four-fingered hand. Gravity is different.

Unlike the electromagnetic force and the strong and weak nuclear forces, writes Sabine Hossenfelder in Quanta Magazine, gravity is not a quantum theory. This isn’t only aesthetically unpleasing, it’s also a mathematical headache. We know that particles have both quantum properties and gravitational fields, so the gravitational field should have quantum properties like the particles that cause it. But a theory of quantum gravity has been hard to come by.

 

In the 1960s, Richard Feynman and Bryce DeWitt set out to quantize gravity using the same techniques that had successfully transformed electromagnetism into the quantum theory called quantum electrodynamics. Unfortunately, when applied to gravity, the known techniques resulted in a theory that, when extrapolated to high energies, was plagued by an infinite number of infinities. This quantization of gravity was thought incurably sick, an approximation useful only when gravity is weak.

 

 

Since then, physicists have made several other attempts at quantizing gravity in the hope of finding a theory that would also work when gravity is strong. String theory, loop quantum gravity, causal dynamical triangulation and a few others have been aimed toward that goal. So far, none of these theories has experimental evidence speaking for it. Each has mathematical pros and cons, and no convergence seems in sight. But while these approaches were competing for attention, an old rival has caught up.

The theory called asymptotically (as-em-TOT-ick-lee) safe gravity was proposed in 1978 by Steven Weinberg. Weinberg, who would only a year later share the Nobel Prize with Sheldon Lee Glashow and Abdus Salam for unifying the electromagnetic and weak nuclear force, realized that the troubles with the naive quantization of gravity are not a death knell for the theory.

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Image credit: With thanks to Cosmotography.com 

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Comments

If you try to explain what these, Twenty-five particles and four forces are, immediately will find that the "Standard Model" is a nonsense.

Problem is the scientists that are trying to figure out why gravity does not fit into their models is because they are all idiots. GRAVITY IS NOT A NUCLEAR FORCE. Wow that is so hard to figure out it took me longer to type the lame response than it did to work out that simple thought.

The universe is one big bowl of jelly. Every object has it's own gravity. The jelly keeps it from falling but it does not stop the direction it is going whether North, South, East or West. This particular jelly is not thick yet not thin but seems to be uniformly even throughout the entire universe. Maybe this is where dark matter comes into play.

The question lies in the origin of time and not today. At the start the strengths of the four forces may well be very different from what these are today. The strengths reduced with the passage of time at different rates and hence the present weakness of the force of Gravity relative to the other three! There is a need to be able to measure the strengths way back in time. That is go to the world that existed well into the past. That is perform such experiments in space that receeded far away from the present location.

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