Undergraduates. They'll do anything for beer money.Orodruin said:Can someone tell me where I can get test subjects?
SPARC data:mike_brandt said:i am working on an alternate explanation of dark matter
i am looking for data sets of rotational and the apperant mass for the same galaxy
multiple data sets would be helpfull.
A few points:mike_brandt said:i here there is a patent clerk that might know somthing
Personal research is off limits for discussion here. Please bear that in mind.mike_brandt said:i am working on an alternate explanation of dark matter
This question, in itself, is fine as a discussion topic, but please keep to that topic, bearing in mind the caution above.mike_brandt said:i am looking for data sets of rotational and the apperant mass for the same galaxy
multiple data sets would be helpfull.
I hear there are plenty of good textbooks that explain his theory. Have you read them? You do realize that the patent clerk you are referring to had read all of the best textbooks on the physical theories that were current in his time? Not to mention published papers in the top journals describing the latest research? (And not to mention working personally with some of the best experimentalists of his day.) He didn't come up with his theories by using origami. He came up with them by making himself an expert in the best current theories.mike_brandt said:i here there is a patent clerk that might know somthing
Since this forum is about cosmology, let's limit geometric/physical explanations to that for purposes of this discussion.mike_brandt said:belive in a geometrical/ physical explanation of everything
Then why would you even attempt to jump straight into the deep end of cosmology? Do you understand anything about general relativity, galaxy behavior, or various cosmological models like the FLRW or the LCDM models? Or even basic astronomical phenomena? And when I say 'understand' I don't mean that you've seen some videos on them or read a few articles, but that you actually understand the details about them such that you could probably teach an undergraduate course on the material. If not, then take a few steps back and realize that you're just going to waste your own time if you try to immediately create an alternative explanation of dark matter.mike_brandt said:ive been a engineer for 40 years working soly on manufactureing. i dont know were the basic data is stored for cosmology
Thread prefix changed A-->I.mike_brandt said:my qualifications.
engineer
mechanic
interest in
knots
origami
both from a theoretical point of view
belive in a geometrical/ physical explanation of everything
major dyslexia as an advantage. i dont see things the same way most people do
PeterDonis said:Personal research is off limits for discussion here. Please bear that in mind.This question, in itself, is fine as a discussion topic, but please keep to that topic, bearing in mind the caution above.
Not on physics forums. Please read the rules you agreed to when you signed up.mike_brandt said:where is the appropriate forum for personal reserch
I'm afraid the answer is "elsewhere".mike_brandt said:where is the appropriate forum for personal reserch
Rotation curves are graphs that plot the rotational velocities of stars and gas in a galaxy against their distance from the galaxy's center. These curves are crucial for studying the distribution of mass within galaxies. Typically, the velocity increases near the center and flattens out at a constant speed beyond a certain point, which suggests the presence of additional, unseen mass.
According to Newtonian mechanics, the rotational speeds of objects orbiting a center of mass, like stars in a galaxy, should decrease with distance from the center once most of the galaxy's visible mass is enclosed. However, observed rotation curves of galaxies remain flat or even rise at greater distances, implying the existence of more mass than what is visible. This discrepancy is attributed to dark matter, an unseen substance that does not emit light or energy.
The mass of a galaxy can be estimated using the rotational velocities from the rotation curves and applying Newton's law of universal gravitation. By measuring how fast objects orbit the center at various distances, astronomers can infer the total mass that must be present to exert the gravitational pull necessary to maintain those orbits. The flat nature of rotation curves at outer regions indicates that the mass continues to increase outward, suggesting a large proportion of a galaxy's mass is in an extended halo of dark matter.
Dark matter plays a critical role in the formation and evolution of galaxies. It is believed to make up about 85% of the total mass of the universe. The gravitational pull of dark matter helps pull ordinary (baryonic) matter together, aiding in the formation of galaxies in the early universe. It also impacts the structural integrity and dynamics of galaxies, influencing their shape, size, and stability over time.
Yes, there are alternative theories to dark matter that attempt to explain the anomalies in galactic rotation curves. One prominent alternative is Modified Newtonian Dynamics (MOND), which proposes modifications to Newton's laws of motion and gravity at very low accelerations, such as those found at the outer edges of galaxies. Another approach involves modifications to general relativity, leading to theories like TeVeS (Tensor-Vector-Scalar Gravity). However, these alternatives have not gained as much support in the scientific community as the dark matter hypothesis, partly because dark matter also helps explain other phenomena such as the Cosmic Microwave Background fluctuations and galaxy cluster dynamics.