New York Skeptics Society talk, 1 Nov 08
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I discuss the difficulty of testing quantum theories of gravity empirically and the general question of verifiability in science. I also comment on how unified theories of physics can help skeptics evaluate novel claims.
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Abstract
Paper Claim
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Paper question Explanation
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- (1st Result)
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This document provides an overview of gravitational concepts including:
1) Isaac Newton deduced the law of universal gravitation after observing an apple fall from a tree and realizing gravity must be the force attracting objects to Earth and keeping the Moon in orbit.
2) Newton's law of universal gravitation states that every object in the universe attracts every other object with a force proportional to the product of their masses and inversely proportional to the square of the distance between them.
3) Examples are provided to demonstrate how gravitational force calculations depend on mass and distance between objects based on Newton's law of universal gravitation.Uti index-papers-e-chapter6-todays-godless-physics
Uti index-papers-e-chapter6-todays-godless-physicsHIDEUMI SEKIGUCHI
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1) The document discusses the current state of confusion in modern physics, specifically in cosmology and particle physics.
2) It examines various theories for the origin and evolution of the universe, such as inflationary theory and multiverse theory, which leave many questions unanswered about what caused the Big Bang and how the laws of physics emerged.
3) It also explores mysteries in particle physics like why particles have the properties they do, such as mass and charge, and how symmetry is broken, pointing out many unknowns in current models.Uti index-papers-e-chapter6-todays-godless-physics
Uti index-papers-e-chapter6-todays-godless-physicsHideumi Sekiguchi
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This document discusses the current state of confusion in physics regarding the origins and development of the universe. It covers several key topics:
1) The inflationary theory proposes the universe rapidly expanded from something smaller than a proton but does not explain what caused the Big Bang. Cosmologists debate what preceded it.
2) Some propose the universe emerged from a quantum fluctuation, though how order developed from randomness is unclear.
3) For laws of physics to exist at the Big Bang implies a great mathematician/physicist predated the universe.
4) Explanations like multiverse theory raise more questions than answers and seem like science fiction. Mystery substances like dark matter and dark energy are largely unYeSen PPT9 4 Flaws in the Current "the Cause of Tides"
YeSen PPT9 4 Flaws in the Current "the Cause of Tides"Ye Er
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This document summarizes 4 flaws in the current understanding of tides:
1) Tides cannot keep up with the supersonic speed of the moon's orbit around Earth.
2) Calculations show solar gravity should have a greater influence than lunar gravity, contrary to observations.
3) It is difficult to explain high tides on both sides of Earth.
4) Calculations show lunar gravity is too weak to explain tides.
However, tide-generating forces have been proposed to explain tides, but this concept still cannot adequately address all flaws.Bp4301373380
Bp4301373380IJERA Editor
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This document summarizes an article that proposes an alternative explanation for dark energy and dark matter based on a modified theory of gravity. It begins by providing background on dark matter and dark energy in standard cosmology and the evidence that supports their existence. It then outlines the proposed alternative theory, which modifies Einstein's field equations by adding a function of the Ricci scalar. This introduces new curvature terms that could potentially drive accelerated expansion, providing an alternative to dark energy. The theory aims to match observations without requiring dark matter or energy, but reduces to general relativity in the solar system scale where it has been tightly tested.document-part- (8).doc
document-part- (8).docPheo23
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1) James Peebles received the 2019 Nobel Prize in Physics for his contributions to theories about how the universe began and evolved. He helped develop the standard cosmological model of the Big Bang theory.
2) According to the Big Bang theory, approximately 15 billion years ago all the matter and energy in the observable universe was concentrated in a very dense and hot state. It has been expanding and cooling ever since.
3) Measurements of the cosmic microwave background radiation provide strong evidence that the universe evolved from a hot, dense early state and has been expanding according to the predictions of the Big Bang theory.Out into space 1
Out into space 1cstraughan
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1) Gravity is caused by the gravitational attraction between all masses due to their mass, as described by Newton's law of universal gravitation. The strength of this gravitational attraction depends on the inverse square of the distance between the masses.
2) On the Moon, you would weigh less than on Earth because the Moon has less mass than Earth, so its gravitational pull is weaker according to Newton's law.
3) By Newton's third law, the Earth is also pulled towards the object with an equal and opposite force to the gravitational attraction felt by the object.Dark Energy
Dark Energypixiejen
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The document discusses dark energy, which accounts for about 70% of the mass of the universe but cannot be directly observed. Measurements of type 1a supernovae found that the expansion of the universe is accelerating, rather than slowing down as expected, suggesting the existence of a mysterious force exerting gravitational repulsion. This dark energy corresponds to Einstein's cosmological constant, which he later disregarded as his "biggest blunder" but may have been correct after all. Current theories hold that dark energy is responsible for the accelerating expansion of the universe.New York Skeptics Society talk, 1 Nov 08
- 1. A Skeptics Guide to String Theory George Musser 1 November 2008 and not just string theory
- 2. 1. THE PROBLEM OF UNIFICATION
- 4. 2. THE ZOOM BUTTON
- 5. Powers of 10 息 1995-2008 by Michael W. Davidson and The Florida State University. Used by permission. http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/
- 6. Energy and Size in Quantum Theory PositionMomentum
- 7. Energy and Size in Quantum Theory
- 8. Energy and Size in General Relativity Threshold for Black Hole Formation 6 Kilometers 1 Solar Mass 1 Centimeter 1 Earth Mass 0.1 Millimeter 1 Moon Mass
- 9. Energy and Size in General Relativity
- 10. Energy and Size in Both Theories Planck scale
- 11. The Fine Filigree of Spacetime American Scientist Nov/Dec 91
- 12. 3. IS QUANTUM GRAVITY SCIENCE?
- 13. Energy and Size in Both Theories Planck scale LHC Cosmic rays Accelerator limit Known universeHuman
- 14. The Skeptics Dilemma If quantum gravity cant be tested, is it really science? But if its not science, do we have to give up the pursuit of deeper explanation?
- 15. Moir辿 pattern
- 20. Just because a theory isnt (yet) falsifiable doesnt mean its not scientific.
- 21. 4. WHAT IT MEANS FOR SKEPTICS
- 22. Use the unity of nature as a criterion for evaluating claims (but carefully). Never ascribe to design what you can ascribe to luck.
- 24. For a copy of the talk, visit www.strings.musser.com
- 25. BACKUP SLIDES
- 26. Moir辿 pattern
- 29. RAW MATERIAL