MetaFilter posts tagged with relativity

Dad, are we, relatavistically speaking, there yet?

zardoz — Thu, 07 May 2009 16:57:28 -0800

Project GREAT: General Relativity Einstein/Essen Anniversary Test
Clocks, Kids, and General Relativity on Mt Rainier

Think your dad was a nerd? A mad genius? Was he a Clark Griswold-esque cheerleader for outdoor family vacations? You ain't seen nothin' yet.

Time paradoxes and alternate universes

ember — Thu, 12 Mar 2009 01:19:21 -0800

These subjects still fascinate me after a lifetime of interest: faster-than-light speed, alternate time streams, parallel universes, time travel, antiparticles moving backward in time, time loops, and the recurring themes of paradox -- all serious but astonishing ideas of science. Something about them inspires infinite possibilities. Am I not alone?

The Spherical Wave Structure of Matter in Space

netbros — Fri, 30 Jan 2009 16:05:00 -0800

On Truth and Reality. Despite several thousand years of failure to correctly understand physical reality (hence the current postmodern view that this is impossible) it is actually very simple to work out how matter exists and moves about in Space. The rules of Science (Occam's Razor / Simplicity) and Metaphysics (Dynamic Unity of Reality) require that reality be described from only one single source existing, as Leibniz wrote: "because of the interconnection of all things with one another." The Four Main Purposes of this Website 1. To help people understand truth and reality 2. To realize that we are structures of the universe 3. To solve the central problems of knowledge 4. To share this knowledge with others Deduce the most simple science theory of reality, the wave structure of matter in Space, then deduce from this to show that it works. There is no opinion involved - it shows that science does work - we just needed the correct (most simple) foundations. Given the Wave Structure of Matter in Space it is now possible to explain what mathematics is, how it can exist in the universe, and thus why it is so well suited for describing physical quantities (mathematical physics). We can simplify Einstein's foundations of representing matter as continuous fields in space-time, to waves in continuous space. It does lead to a very simple, sensible foundation for understanding physical reality, and thus how you exist in the universe. This article basically explains the main subjects of quantum theory from a Wave Structure of Matter foundation (wave mechanics). If you prefer shorter summaries just browse the quantum physics links on either side of the page. The purpose of the Cosmology page is to simply explain the two cosmology theories that are consistent with current observations. You will need a basic understanding of the Wave Structure of Matter (WSM) before you read it. This WSM cosmology is actually describing what you really are, how you exist in this space of the universe and interact with everything around you. There is a revolution coming in the foundations of our knowledge because we have solved the central problem of metaphysics, of what exists (space) that causes and connects the many things we experience (waves in space that form matter, the discrete and separate particle an illusion of our limited senses). Matter is large, a structure of space, and this truth about reality will change humanity. If we are to discuss God and Religion, it is obvious that we must clearly define the meaning of these words (as all words are human constructions). In Philosophy God is generally referred to as the One thing that exists, infinite and eternal, that causes and connects the many things. Likewise, Religion, from Latin 'religare' meaning 'to bind', describes our connection to God as the One thing which exists. From this foundation we then see the clear connection between the sciences of philosophy, physics, metaphysics, and theology, as they are all founded on this Reality of One thing existing. As humans have evolved from Nature they ultimately depend upon Nature for their survival. Until we understand what we are as humans (what matter is) and how we are connected to the universe (reality), it is impossible for humanity to be wise, and to be able to evolve cultural knowledge that enables us to live in harmony with Nature. It is well known that our senses are deceptive, that when we see things as being separate and discrete bodies this is an illusion. Using science terminology then all we are really talking about is evolution and ecology. That all things in the universe (including life on earth) are interconnected and changing (the dynamic unity of reality). Teaching people how to think correctly and to use language carefully (to work out the truth for themselves) is a pretty good start for education (i.e. by teaching philosophy to students from a young age). If we are to improve human societies (which has become an urgent problem) we must consider the forces that determine their evolution. And four of the most significant factors are market economics, politics, education (the knowledge foundations of the people) and Nature.

New Trade Theory

grobstein — Tue, 11 Mar 2008 12:38:50 -0800

Where no economist had gone before . Paul Krugman posts a type-written paper on interstellar trade which he wrote as "an oppressed assistant professor" in the '70s. I do not propose to develop a theory which is universally valid, but it may at least have some galactic relevance. [pdf link]

Quantum Mechanics: Myths and Facts

XMLicious — Mon, 25 Feb 2008 13:21:29 -0800

Quantum Mechanics: Myths and Facts (pdf), a recently-updated paper on the Cornell arXiv peer-review site. By Hrvoje Nikolić of the Rudjer Bošković Institute in Croatia. Note: the presence of a paper on arXiv does not necessarily mean it has been reviewed and is not equivalent to having been published in a journal.

Relativity in Four Letters or Less

Citizen Premier — Thu, 30 Aug 2007 06:33:16 -0800

Relativity "Lite."

Your random audio links of the day.

goodnewsfortheinsane — Wed, 29 Aug 2007 15:24:15 -0800

Today's post of tenuously related audio brings you ten historic radio broadcasts, 529 eternal questions in popular music, and one mildly amusing black metal band prank call.

'We have broken speed of light'

hermitosis — Thu, 16 Aug 2007 12:51:39 -0800

"We have broken speed of light." So say Dr. Gunter Nimtz and Dr. Alfons Stahlhofen of the University of Koblenz, in this article from New Scientist. Dr. Nimtz's work has been cited on MeFi before.

Learning can be fun.

nickyskye — Mon, 26 Jun 2006 12:57:05 -0800

Science sites of all kinds for kids. Archeology. Entomology. Natural Symphony. Baseball in Space. Philosophy. Process or Content. Science songs. Physics songs, relativity. String theory. Science and Art.

Einstein & Fleischer DVD

dbiedny — Fri, 21 Apr 2006 04:31:11 -0800

Einstein TOR DVD is a mostly animated feature film from the early 1920s, long thought to be lost, featuring animation from the incredible Max Fleischer (who is responsible for the seriously cool Superman animated cartoons). For $15, looks like a must-have for animation buffs and science geeks.

Make the Kessel run in less than twelve par-secs!

zoogleplex — Mon, 09 Jan 2006 15:07:44 -0800

Hyperdrive and a possible Unified Theory. New Scientist article about a paper and proposal to NASA outlining development parameters and possiblities for a faster-than-light anti-gravity propulsion system, based on some rather interesting physics theories originated by a guy named Heim. You mean you've never heard of the Millenium Falcon? (via)

everyone's a scientist

mdn — Thu, 05 Jan 2006 10:00:32 -0800

The sun is solid (this has beautiful images, btw). The earth is fixed, or maybe growing; relativi ty is wrong, and so is most of current thinking... For the intriguing as well as the insane, visit the fringes of science.

Lightspeed Travel Simulation

feathermeat — Thu, 29 Dec 2005 22:52:34 -0800

What would Tübingen look like if you traveled through it at the speed of light?

Hmm....

delmoi — Mon, 10 Oct 2005 13:48:34 -0800

Does dark matter exist? Dark matter has been suggested as a solution to the galaxy rotation problem where individual stars don't seem to rotate the way Newton's laws would predict. Now, some scientists are saying that observations fit with Einstein's general relativity, without any dark matter needed. I just find it amazing that no one has tried this yet.

Stupid Google Tricks

DevilsAdvocate — Tue, 30 Nov 2004 19:33:20 -0800

Does relativity have any practical significance? In fact, relativity had to be taken into account by the designers of the Global Positioning System. The GPS satellites are affected both by special relativity (since the satellites are moving, clocks aboard them appear to run slower as seen from the ground), and by general relativity (since the satellites are farther away from the mass of the earth, clocks appear to run faster as seen from the ground). The net effect of both is that clocks aboard GPS satellites would gain 38 microseconds per day relative to the ground, if relativistic effects were not corrected for--a figure which can be confirmed by using Google calculator.

Santa Cruz Mystery Spot

jasonspaceman — Thu, 17 Jul 2003 08:29:01 -0800

The Mystery Spot in Santa Cruz, California is one of many places in the US that challenge the theory of relativity. Berkeley psychologists have a theory about these mystery spots. Another Berkeleyan visited the spot and documented his tour. Some have done their own comprehensive tests and came to a different conclusion. A book was written to describe these gravitational anomalies, skeptics and believers all have an opinion ... but where does the truth lie?

Relativity, in words of four letters or less

Mwongozi — Wed, 05 Feb 2003 14:37:32 -0800

Albert Einstein's Theory of Relativity in words of four letters or less

If Gravity were to race Light...

aaronscool — Tue, 07 Jan 2003 15:10:29 -0800

In an interesting test of the theory of relativity they found that gravity travels at the same speed as light. Put simply if the sun were to disappear from existence it would take some 8 minutes before the Earth's orbit would be affected by the loss. Sadly this also means that FTL travel is becoming less and less likely to be possible.