Theories Definition and 466 Threads

I am looking for some information on Tooth Eruption Theories. Thank you all. :)

Here is one I am having trouble following. Can anyone help me through my confusion? Our setup is a normal Bell test using entangled photons created using spontaneous parametric down conversion (PDC). Such a setup uses 2 BBO crystals oriented a 90 degrees relative to each other. See for...

hello, i'm amit from israel, and i'd love to be an activated member in your forum. my first question - are there other theories about the beginning of the univers. except of "the big bang" (not religion)? thanks, amit

I believe Einstein said, 1.There are four dimensions to space, the normal three plus time. 2. Speed of light cannot be obtained due to an object traveling at such speeds gaining mass. The faster it goes, the more mass gained, until it reaches “infinite mass”. 3. Mass and Energy are pretty much...

Can someone explain the Omega pointe to me? In regards to the theory of the universe collapsing?

As things seem a bit slow of late i wonder if anyone would give an over view of the gravity debate, i know the Higgs is still elusive and the graviton remains un found, no axions as yet, etc, etc, but what does this mean to string and loop theories?

Waddup guys. To my understanding M-Theory is a theory which 'combines' the five superstring theories and supergravity.Also i understand that matematics is not yet advanced enough to make it work(or so I've been told) I am still not sure how this theory is meant to end up as a theory of...

Anyone know any cool new theories about time travel?

Heya, I am writing a paper at the moment on aether theories from an historical perspective. I am mostly interested in the mathematical basis of aether theories starting from when Maxwell unified electric and magnetic fields. What I would like to know is if anybody has any idea where to...

Here I'd like to present theories of professor of physico-chemistry, Ph.D. Najip Valitov from Russia, who discovered new theories after Einstein. Part of his discoveries are described in his web-page: [PLAIN]www.bashedu.ru/ValitovNKH.htm[/URL] In 1972 professor Valitov, who lived in the...

in all the failure theory we compare the stress in the structure to the yield stress in the uniaxial testing. How this is valid? for example in a structure the max normal stress is sigma x. and we compare this with the maximum normal stress in a uniaxial tension test. in vonmises also...

I'm sure you've all heard a lot of them in your time, so share with me some of the most rediculous ones, or ones that amuse you most. I just stumbled across this little beauty: http://www.nov55.com/geol.html The person explains in vaguely how soil formation through the means of breakdown...

Does anyone know of any comprehesive sites featuring ALL of the following: the Keynesian theory, Monetarist theory, and the Rational Expectations theory? Any ones that compare/contrast them would be excellent. Thanks again.

http://www.scifiscience.co.uk/index.htm From Astronuc. This gives a very brief introduction to Relativity, Chaos, and Superstring Theories, and a few other Sci-Fi Science concepts.

http://xxx.sf.nchc.gov.tw/pdf/hep-ex/0503034 This paper is a review of anti hydrogen production, and how it could be used to test gravity theories.

This is my (limited) understanding of particle physics: In particle physics gauge symmetries play an important role. To allow for massive gauge bosons this symmetry is broken. The theory of weak interactions can be derived from a local SU(2) symmetry, and quantumchromodynamics from a local SU(3)...

some theorist predicts proton can decay, since the decay of proton does not violate any fundemantal conservation law. My question is, could neutrino decay? How come I have never heard of anyone say neutrino could decay?

I am looking to learn about the major flaws with our current theories and data on climate change, particularly in terms of the ice ages. Any examples of inconsistencies or problems with data, or any other information you could give me would be much appreciated. Thanks, Matt.

From John Baez’ page on the experimental basis of Special Relativity, he says that: and My question pertains to the remarks in blue: aether theories that are experimentally indistinguishable from SR. Where are these theories published? One member (Yogi) makes reference to the so-called...

I've been attending at high school and I have some ideas about complex numbers. I shared my thoughts with my math teacher. He decided to search. I want to make sure if none have thought them so I need some information about complex numbers. Could you offer me some written sources and the...

well there are many stories of human beings being able to do things that we would only think are in our favorite comic books but let's focus on walking on water. from jesus to the monk of tibet, there are lots of stories about human beings walking on water, so is there any theory as to how this...

I've often read that quantum mechanics and relativity theory are logically incompatible theories, meaning that both theories cannot be true. Can anyone use mathematics to prove that? Thanks, King

If a galaxy is 1 billion light year far from us and if for us big bang did happen 13 billion years ago then when it did happen for that galaxy ? Pure guess will predict the answer 12 billion years, but what the observer on that galaxy will say about us ? will not he predict that we are...

Greetings , my friends! Haven't asked that question in public before but for now I thought it might be beneficial to do so since You guys know stuff around here. What do to if You've came to a some kind of science theory? ...new therorem in maths , law in physics or alike which seems...

check this out http://www.prisonplanet.tv/audio/091204hilton.htm and this http://www.freedomunderground.org/memoryhole/pentagon.php#Main tell me what you think

Which, if any, of Einsteins models and theories have been replaced by more advanced or precise ones? The only thing that comes to mind was Einstein's "greatest blunder", the cosmological constant. But hasn't that even found its was back into the equations? Thanks, Glenn

"Planck scale Lorentz-symmetry test theories" Amelino-Camelia new paper by Giovanni A-C http://arxiv.org/abs/astro-ph/0410076

hello, from sometime in past i was in contact of the string theories. But one thing that clicked in my mind that how does the physicst started the idea of the string theories (all of them) like Newton formulated the law of gravitational force after he observed the motion of the moon...

Could someone rephrase in a short and casual manner the famous Millenium Problem of the Clay Math institute ? http://www.claymath.org/millennium/Yang-Mills_Theory/ Thank you for help !

An interesting observation I made while in chemistry lab was that volatile liquids follow a type of "relativity theory." Imagine temperature (T) as the speed of light (C) in this thought experiment. So, as the heated water approaches T>100 degrees Celsius, the water converts to another state...

Items in a data set or group are divided into pairs with specific relationships between each pair. In this way a degree of order is introduced into the set. I understand this can be done with the entire universe but where do I find out more?? Any suggestions would be helpful.

Any suggestions on where I can find general descriptions of relational theories please?

Steven Hawking's / MKaku. Who's right about Black Holes? Does Prof. Steven Hawking's revised Theory of Black Holes rule out the existence of parallel universes? What about the Two Big Bang Theory by Dr. Raj Baldev, what implications does this theory have for M Theory.

Can a rank 2 field be considered, in principle, to be the dot product of two rank 1 vector fields?

I find discussing the beginning and continuation of the universe one of the more interesting aspects of physics. Also the fact nobody really has any concrete proof as to much of where the universe is going, its boundaries, its expansion. Alot of people have their own ideas or beliefs, and i'd...

i'm interested in any alternative theories re: dark matter...is it possible that we simply have misunderstood gravity at these distances? it seems strange to me that we look for symmetry in the physical laws and so we see something we can't explain using the law of gravitation and our...

Can someone please explain to me the current theories of Time? I have an idea I want to put forward to you all, but need to get a little groundwork in first. Based purely on what I learned in school, time is currently veiwed as linear, if so, how is this even possible? Much appreciated, thanks.

how are quantum theories applied to everyday life? in the physical, biological and chemical systems? like how does quantum theory explains the existence of parallel realities or universe?

Hi. Could someone please post a quick summary of which string theories are out there and how they relate to each other? I could only find partial information on this... Thank you.

So don't be surprised if it's crap.In fact I know it's crap,I just need proper physics people to confirm it's crapness. :redface: Think of a hollow cylinder.There are springs on the bottom and top surfaces of the cylinder,meaning that if a ball was inside it would bounce back and forth.It is...

Gravity Probe B is due to be launched on Monday, 19 April, 2004. Many years in development, it is intended to provide good tests of "two extraordinary, unverified predictions of Albert Einstein's general theory of relativity." Many posters to PF have difficulties with GR; several have...

Hi, India rarely helps scientific advancement. Recently this country has made some wonderful advances in the field of missile technology and information technoloy. Their recognition has become strong now. Indians are now more popular in American due to outsourcing issue. Similarly some...

Is it strange that there are exactly the same number of superstring theories as there are known quarks?

Bell thought that maybe non-local hidden variable theories might have something to say, even though local hidden variable theories have been shown to be unable to properly describe nature. well, what exactly would you mean by a non local hidden variable theory? where exactly does the...

anyone familiar with this place in florida and the theories on magnetism the man whou built it espoused? http://www.fortunecity.com/greenfield/bp/16/coralcastle.htm

--------------------------------------------------------------------- References: 1) Green M., Schwarz J., Witten E., Superstring Theory Vol. 1,2, Cambridge Univ. Press, 1987 2) S.Klimenko, V.Talanov, I.Nikitin ``Singularities on the world sheets of open relativistic strings'', Preprint...

I am writing a paper on the Theory of Everything, and it's effect on mankind. I was wondering, how do you think the public would react if a theory of everything was discovered? How would the public accept a theory such as this (so large scale)? How would society change in general...

Meh, nobody looked.

I want to know how many Calabi-Yau manifolds there are in each of the 5 superstring theories. Can you point me in the right direction?

not really philisophical more pyscological but anyone got any theories on why we fear death? isn't it supposed to be the solution to our pain? I've got my theorieso n it but i want to hear others...