Evidence Definition and 367 Threads

http://latimesblogs.latimes.com/washington/2009/04/ted-stevens-feds-drop-charges-can-he-get-his-senate-seat-back.html

Besides keeping the whole of galaxies rotating at the same rate, and holding galactic clusters together, what are the other forms of evidence for dark matter?

1-electron scattering 2-collider data 3- ? is there anything else which supports the quark model or is it just those 2. from what I've read so far its just those 2 but could be incorrect so correct me if my primative understandings off THANKS

So does there exist any evidence to support the theory of length contraction? I am aware of the overwhelming evidence to support time and mass dilation, but none for length.

http://arxiv.org/abs/0901.2984 Asymptotic safety in higher-derivative gravity Dario Benedetti, Pedro F. Machado, Frank Saueressig 4 pages (Submitted on 20 Jan 2009) "We study the non-perturbative renormalization group flow of higher-derivative gravity employing functional renormalization...

Hi! I would like to know if there is any direct experimental evidence of the electron distribution inside of the hydrogen atom. In the Wikipedia article http://en.wikipedia.org/wiki/Hydrogen_atom" you can see the solutions of the Schrödinger equation and the graphical representations of the...

I'm curious about the nature of the evidence for three quarks -- two up and one down -- in the proton. I assume the data is derived from high energy scattering experiments, and looking at the angles and momenta of the scattered particles. But I don't see how, from such experiments, one can say...

According to this paper an amateur would never know. http://arxiv.org/PS_cache/arxiv/pdf/0705/0705.2462v1.pdf

Were there any experiments that proved doppler shift of light on a fast moving object - that it has higher frequency if the object is moving towards you and lower if the object is moving away?

Hello ! I'm looking for a paper or a link that would report observational evidence of chaos behaviour for the three-body problem. Thanks for helping me.

Craig Hogen, in his paper Indeterminacy of Holographic Quantum Geometry, Phys. Rev D 78, 087501 (2008), has claimed noise seen in output of the GEO600 interferometric gravitational-wave detector is evidence for a fundamental minimum interval time. What is the time-line for the survival of this...

Homework Statement What experimental evidence requires that the emission of energy by an atom be quantized? The Attempt at a Solution I can completely confused on what the question is asking. What do they mean by "experimental evidence"? Do I talk about Bohr and how he proposed that to...

'XMM-Newton’s massive discovery' 25 August 2008 'ESA’s orbiting X-ray observatory XMM-Newton has discovered the most massive cluster of galaxies seen in the distant Universe until now. The galaxy cluster is so big that there can only be a handful of them at that distance, making this a rare...

The top line from the "Search Tag Cloud" black holes bleeding carl sagan Ok, so I'm easily amused :biggrin:

CNN reports two men from Georgia have a 7ft tall half man half ape in a freezer. They will announce the findings today! http://www.cnn.com/2008/US/08/14/bigfoot.body/index.html

Hello, Is there any empirical evidence that electromagnetic radiation produces gravitational fields? I understand that as a form of energy it is expected to induce a spacetime curvature, but has this prediction of GR actually been tested? Is it at all subject to any controversy? Thanks, Armin

Direct Evidence of “Dark Energy” (?) Hawaii Scientists Find Direct Evidence of “Dark Energy” in Supervoids and Superclusters superclusters & supervoids A team of astronomers at the University of Hawaii Institute for Astronomy (IfA) led by Dr. István Szapudi has found direct evidence for...

more evidence for dark matter---another cluster collision http://arxiv.org/abs/0806.2320 this has some similarities to the famous Bullet Cluster collision where the ordinary matter gas had collided and gotten stopped and the galaxies with their DM had passed on thru it's reassuring to...

Interesting publication: http://www.chemie.de/news/e/84187/ In normal geology jargon, this means that they are pretty convinced to be on to something. However: What they found was depletion of heavy 13C atoms reducing the d13C ratio to values comparable to photosynthesis nowadays as...

I read somewhere that if a beam of photons all of like polarization are directed towards the surface of a disk (the disk being capable of rotation), the disk will rotate. This rotation is supposed to be experimental evidence confirming that photons have angular momentum. Is this true?

hi i just wanted to ask if someone could explain this graph for me http://hyperphysics.phy-astr.gsu.edu/hbase/astro/univacc.html thank you

I keep hearing that the "many worlds interpretation" is experimentally different than the collapse theories. But I haven't heard of anything other than "quantum suicide". Is there anything else? As far as quantum suicide, I fail to see how this differs from collapse theories. Isn't each...

Albert Hoffman (inventor of LSD) dies aged 102 http://news.bbc.co.uk/2/hi/europe/7374846.stm If he hadn't taken drugs he might have lived longer.

Homework Statement What observation of the process: (anti muon neutrino) + (electron) -> (anti muon neutrino) + (electron) constitutes unambiguous evidence for weak neutral currents, whereas the observation of (anti electron neutrino) + (electron) -> (anti electron neutrino) +...

What is the evidence for the Inflationary Period? Is there CMB/ WMAP data to support the theory of inflation? As far as I know, which is very little, the Inflationary Period was inserted into the standard model of cosmology to account for the Horizon Problem. What evidence for the period is...

Hello, can someone explain how a line spectrum works. How do they provide evidence of energy levels in atoms? I would have thought that energy levels are to do with a different concept of Bands (Valence, Conduction) so how does a line spectrum provide evidence? :confused:

I just wanted to start by stating that I have been a long time reader of these forums (this is my first post) and want to thank all of you out there for taking the time to share with the rest of us your knowledge and insight. I have fairly recently become interested in the topic of our...

First Evidence of New Physics in b <--> s Transitions Hi, please look at the following arXiv : http://arxiv.org/abs/0803.0659 First Evidence of New Physics in b <--> s Transitions Authors: UTfit Collaboration: M. Bona, M. Ciuchini, E. Franco, V. Lubicz, G. Martinelli, F. Parodi, M...

What is the evidence to date of a quantum cosmology, is there any evidence for the string or brane, is there any evidence for LQC i only ask as a member of the public who wants to know how this area of science is advancing.

The observation on the bullet cluster collision was stated as direct evidence for dark matter. http://apod.nasa.gov/apod/ap060824.html But could there be a possibility that it's just some molecules that are too dark to be seen ?

Hello, Homework Statement What evidence do we have to support the assertion that the universe is electrically neutral on large scales? Homework Equations The Attempt at a Solution I know that gravity is the dominant force on large scales but what kind of evidence can we give...

[SOLVED] Evidence for the existence of neutrinos. [solved]

1. I'm just wondering exactly why people theorize that the universe is 13.7 billion years old. What is the accuracy of this estimate? 2. How certain are cosmologists that there was a beginning to time and what evidence is there of this?

This paper came out on the arxiv a few weeks ago. I've not had a chance to read it fully yet, but it looks like an interesting paper. http://arxiv.org/abs/0710.5307 Here's an article in the news section of Nature on the same topic: Bursting Dark Energy's Bubble.

any ideas of which experiments best illustrate this Homework Statement Homework Equations

Hello all! I read this post on another physics forum. I thought Keplers laws were accurate for our earth/sun system? "Keplers law is so easily disproven Keplers Law states that the planets move in elliptical orbits with the sun at one focus of the ellipse so that a line connecting...

DO WE ALREADY HAVE EVIDENCE OF DARK ENERGY - OUR MANIFOLD? If LIGO I with it’s 10^-21 sensitivity, VIRGO etc. don’t detect gravity waves, might this then be interpreted as indicating that C_R pseudo-Riemanian spacetime continuum (i.e. manifold’s) stiffness is not INsignificant; rather...

http://news.bbc.co.uk/2/hi/south_asia/6994415.stm That's kinda funny, actually.

can anyone recommend any good books or online articles that cover all the evidence in favor of evolution? I found this so far: http://www.talkorigins.org/faqs/comdesc/ it seems very long and detailed, considering I have very little background in biology. Is it a good site, nonetheless?

What's the scientific evidence regarding who has bigger calves muscle? Men or women? I have heard that women have bigger calves than men because in the pregnancy in which they use their legs. I have heard that men have bigger calves than women because they have more testosterone than...

I was arguing with someone who denies big bang cosmology. I presented him with the following evidences -Hubble's law -CMB -Abundance of helium -Existence of deuterium But apparently this did not convince him. Can someone point me in the direction of more evidences?

how does one experimentally check biot-savart's law

In a G field, clocks at a lower potential (closer to the mass producing the field) are known to run slower. When the two clocks are brought togther, the upper clock should be found to have accumulated more time than the lower clock. A rocket accelerating at "a" is equivalent to a G field...

this just appeared in the peer-review journal Physical Review Letters. I noticed the preprint of it on arxiv last year and thought it was pretty far out. Here is the revised October 2006 preprint: http://arxiv.org/abs/astro-ph/0610844 Shining light through the Sun Malcolm Fairbairn, Timur...

NASA just had a press release today of new evidence that supports the presence of Dark Matter. I think this would be the most direct detection so far if verified. http://www.nasa.gov/home/hqnews/2007/may/HQ_07114_Hubble_Dark_Matter_Rings.html We still have to wait for the publication of...

Two separate and independent means of observation have shown indications that the universe may have an axis of symmetry: Axis of evil' a cause for cosmic concern. 13 April 2007 Zeeya Merali http://space.newscientist.com/article/mg19425994.000?DCMP=NLC-nletter&nsref=mg19425994.000 One of...

I am looking to read up on some recent experiments that provide evidence for the expansion of the universe and I don't know where to start.

Interpretation: The Cosmic Background Radiation is evidence of a flat universe. Problem: How does a teacher show that all the knowledge necessary for this interpretation does not require the assumption of a flat universe?

Is there any experimental evidence that confirms or points toward extra spatial dimensions? I have been looking around for a bit, couldn't find anything.

What is the evidence in favor of dark matter? How does does this take into account baryonic and non-baryonic matter?