Evidence Definition and 367 Threads

There are several types of evidence for DM and Helsinki scientist Matts Roos provides a 39 page overview listing and summarizing each kind. It's a useful article. He gives graphic figures to illustrate each type of evidence. http://arxiv.org/abs/1208.3662 Astrophysical and cosmological probes...

There is a confusing article in the August, 2012 Scientific America concerning the recent discovery of a massive gamma radiation emission from the Milky Way galaxy, from the very recent past. As our solar system is one of the many members of the Milky Way this is an interesting subject. If...

There is observational evidence for preferred alignment of spiral galaxies with alignment to the so called axis of evil in the CMB (cosmic microwave backgound 2.75K) data. http://arxiv.org/ftp/arxiv/papers/0707/0707.3793.pdf http://arxiv.org/ftp/arxiv/papers/1104/1104.2815.pdf

Hi, I remember that long long time ago, I got that the time will slow down when one object does accelerate to be in light speed. What is the evidence to prove this? Best regards

Two part question: 1. I keep reading about large dinosaurs having nostrils the size of horses, thus not able to breathe in today's environment. Also, the oxygen content found in petrified amber, being higher than current day. Is there any new evidence or new theories about the environment...

Greater Knowledge = More Evidence for Design?? I was studying bacteria. With better technology we have been able to determine that bacteria have an extremely detailed motor that allows for transportation. It is equivalent to a human swimming thru thick grease at 60 miles an hour. It baffled...

this is from lisa randall's knocking on heaven's door Does any know if the LHC has accumulated in favor of technicolor?

new article (note, the above quote is from the news article, so subject to journalist interpretations): http://neurosciencenews.com/conscious-perception-global-neural-networks-prefrontal-cortex/ peer reviewed article: http://www.cell.com/neuron/abstract/S0896-6273(12)00380-7

The Reference Frame: A confirmation of the 130 GeV dark matter-like bump - Lubos Motl [1204.2797] A Tentative Gamma-Ray Line from Dark Matter Annihilation at the Fermi Large Area Telescope - Christoph Weniger [1205.1045] Fermi 130 GeV gamma-ray excess and dark matter annihilation in...

Need this for a school project ASAP. I am looking for information that prooves parts of the the big bang theory were real. If possible I will need sources for this. I am giving a debate on wheather or not it is real. I am the pro side. Help much appreciated, thanks.

Homework Statement I'm just trying to prepare a study pack for my final. I am curious about something I have been reading over in my textbook. Can someone please explain this for me? "Be able to explain why a two-slit experiment with electrons is evidence that electrons are waves" ...

I have 2 close friends who believe we've never been to the moon. I've tried explaining to them why the flag moved, why there is no need to go back, etc, and it falls on deaf ears. This morning i saw this video by NASA [...

hello, i am writing a report on wave particle duality and i have included the experiments you would expect. young's inteference patterns as evidence for light as a wave, and the photo electric effect providing evidence for light as a particle. etc. what i am concerned about is does the...

Sorry if this has already been discussed. I just couldn't find it. So the main proof for dark matter comes from the anomalies of the gravitational interaction between galaxies and not being able to explain the near constant velocities of the rotating stars observed in a galaxy, independent of...

The proportionality constant of big G (like Planck's constant) seems to suggest that gravity is a quantized 'thing'... does anyone know of any experiments (perhaps with a Watt or torsion balance) that show evidence of this?

Most theories (/ when doing experiments we) assume that the electron, quark, etc are really point particles. What is the evidence for this? I don't think, for example, that experiments at cern convey that they are. They could have an internal structure with a stronger force than the strong...

Hi What was the evidence that led Maxwell to conclude that light is an electromagnetic wave? How do we measure the strength of the electric and magentic fields of a light beam ? TIA

Astrological "evidence" produced by looking at the tails of a normal distribution I just ran across this on a large news aggregation website, so I'm sure some people here might have seen it as well. http://www.inquisitr.com/173752/jail-time-predetermined-by-astrology-signs-says-police-study/...

why can we believe that redshift PROOVES expansion of universe when we know that redshift could have been caused due to gravitation.

Please correct me if I am wrong, as I have little more than a high school knowledge of physics until I start at university this year - virtually no knowledge of the quantum side of things just yet. ^^ My thought is, as spaghetification occurs as you approach the centre (not using singularity...

Homework Statement What is the primary evidence that the Earth's outer core is fluid in nature? (2 marks) The Attempt at a Solution The Earth has a magnetic field which is created by molten iron that is moving. If there were a solid outer core, there would be no moving iron and no...

The only evidence I have is from introspection, but it's happened so often I'm wondering if it's a more common experience. The day after drinking heavily my mind is not sluggish. It's lightning fast. I'm extremely sharp, I talk very quickly, produce more jokes, see though irrational...

Hello, I was wondering if the particle lifetimes as measured by observers increases in gravitational heavier areas. Relativity seems to suggest this, and there seems to be little criticism of this concept but I couldn't find any experimental evidence supporting this. Has this ever been shown? Or...

Homework Statement Discuss the evidence from the periodic table of the need for a fourth quantum number. How would the properties of He differ if there were only three quantum numbers, n, l, and m? Homework Equations The Attempt at a Solution The Pauli Exclusion Principle...

Hello all, I know "quantum entanglement" is real, in some sense. I know that if we entangle two particles their spin, for instance, is closely related. Especially spin entanglement has enough evidence, yet it is also easy to explain using a hidden variable. Hence I wonder: what other...

Is there any evidence for quantum fermi-dirac distributions among neutrinos, besides the obvious fact about their spin? I was wondering how Pauli exclusion principle would work with a neutrino 'gas', and what kind of quantum numbers they could have. It has been expected that if we ever did...

Scientists have http://www.thesun.co.uk/sol/homepage/news/3933034/Bigfoot-Weve-found-the-best-evidence-Yeti.html" what they claim to be the best evidence for the bigfoot yet discovered.

Hello, I was wondering if there was any experimental or observational evidence for neutrinos being affected by gravity. Be it through detected lensing or other means. All I could find were some papers on lensing none of which seemed to have actual results out of the error margin.

a cyclical or oscillatory universe?

For some reason, incomprehensable to me, archeologists and antropologists have fought flaming wars about the peopling of America. Maybe that has to do with my new signature. Anyway, the clovis first protagonists may have some work to do after...

PhD Astronomy Prof: "Paucity of evidence for the Big Bang" an acquaintance of mine who holds a PhD in physics and teaches astronomy at a university says the is "a paucity of evidence for Big Bang theorizing". After I close my gaping mouth how should I respond?

1. Vinko Rajic is talking about in his videos on YouTube that he can use telepathy all the time and 100% correct on few kilometer. Uri Geller could give evidence for telepathy at Stanford University. 2. At Edinburgh University, experts conducted controlled experiments to see if...

Hi there - I'm looking for a reference on the issue of whether the three fundamental couplings unify. The most recent reference I have is from 1993, at which time it looked like the odds were against unification, but does anyone know a more recent reference? Thanks!

Explain how data from emissions spectra provide evidence for discreet energy levels within the atom?

Hello, could someone point out to me 1) Ironclad evidence of correlated light curves - and I mean a correlation that is beyond doubt - among lensed quasars 2) Morphological correspondence - e.g. corresponding jets - in images of lensed quasars. I can find sketchy cases which may be...

Is there a map out there showing the oldest evidence of humans in the Americas by region? IE a map that could show when humans first arrived in area X?

Apologies if this has been raised. Could not find what i was looking for. We are being given paleomagnetics as part of a basic science degree, and i was having problems getting what the evidence is for geomagnetic reversal. My tutor could not answer this question and tells me to move on to...

So I know that "Conciousness as the Fifth Force" gets a lot of hate around here, but hear me out, this is legit. So my mother always told me "A watched kettle never boils". The other day, I found this out to be true. Every morning (okay, sometimes it's the afternoon) I wake up and put on...

I know that the only dark matter models consistant with the cosmic microwave background radiation require bottom-up structure formation, but all of the relevant press releases I've read are about finding surprisingly large/mature structures in the early universe. Do the same...

I read that one of the evidence was the experiment done with two polaroids (where one is rotated relative to another). Can you give me others please? Thanks!

FAQ: What is the evidence on Big Bang versus steady state cosmologies? Let's consider this question first under the assumption that general relativity and standard quantum mechanics are valid. (Both QM and GR have been verified to high precision by a wide variety of empirical tests.[Will])...

Suppose we have two hypotheses H1 and H2. We also have a potential conclusion C. We know all prior probabilities involving H1, H2, and C. Now, we are given new information that H1 -> C and also H2 -> C - they agree on the same conclusion. Let's call this new information A (for Agreement)...

Greetings, Maybe I'm getting a little bit confused, but I'm looking for resources which explain how to update parameters of a Bayesian network as a result of observations. There are various inference methods, but unless I'm missing something here, these methods produce a posterior...

Introduction: diffraction is an evidence that light is wave. Photo electric effect shows that light is particle. Question: What about reflection and refraction? Are they evidences of the wave nature of light or of the corpuscular theory?

My QM is undergrad level and I don't keep up on recent breakthroughs. I'm curious what the status is on space structure. This article (Mecklenburg, 2011) uses the phrase "hidden substructure" http://prl.aps.org/abstract/PRL/v106/i11/e116803 is it similar to Zurek, 2001? "structure on...

I've been told that we can use geological and paleontological records to show that the Earth rotated on its faster in the past. For example it is said that the Earths year consisted of 370 shorter days in the Cretaceous. Which records are these, and how do they tell us this?

Webb et al wrote article "Evidence for spatial variantion of the fine structure constant". http://arxiv.org/abs/1008.3907. As I understand there exists direction where fine structure constant is the smallest and the opposite direction, where it is the largest. Do maybe these directions have...

Saw this on Monday morning: http://www.foxnews.com/scitech/2011/03/05/exclusive-nasa-scientists-claims-evidence-alien-life-meteorite/ My feelings on the validity of the findings are doubtful or inconclusive at best. Biology and extra-terrestrial life really aren't my expertise so I thought I...

http://www.foxnews.com/scitech/2011/03/05/exclusive-nasa-scientists-claims-evidence-alien-life-meteorite/". Snippet:

http://www.foxnews.com/scitech/2011/03/05/exclusive-nasa-scientists-claims-evidence-alien-life-meteorite/ When you consider the intergalactic scale and that there are something like 3x10^24 stars it seems so probable that life would exist--even in more complex forms. I heard that other labs...