Modern and Theoretical Physics

An uniaxial strain was imposed in a stable structure of SAC material(using 'erate' command) and I was expecting stress in only the loading axis. The boundary was periodic in all axes. I was using NVT ensemble and after the simulation I got stresses in the other two axes. Can anyone suggest what is happening in here? . Pxx is along the loading axis and Pyy is along the one of the other two axes

A friend and I were having a debate as to wether this theory holds true: Please try to imagine that you were motionless in free space (relative to whatever....) and you were standing on one end of a plank with your feet firmly secured to the plank, and at the other end of the plank there was a board much like a basketball back board firmly secured to the plank facing you. Please Imagine you had pockets full of good sized rocks, if you were to throw a rock at the back board, you and the plank along with the back board would move in the opposite direction to the rock until the rock hit the back board, then at that point the rock hitting the backboard would cancel out t…

Hi Where can I get solutions manual for Mathematical Physics by Sadri Hassani Thanks

A perfect vucuum is the absence of matter in an area of space. A black hole is a super dense mass. Would you say these are the opposite of each other and if so how would you properly define their relationship? Could they be used to explain gravitational effects on a system? Would they cancel Each other out? And so on. Referenced to listed pages https://en.m.wikipedia.org/wiki/Vacuum https://en.m.wikipedia.org/wiki/Black_hole

Could somebody explain in detail why is it practically impossible (as I suspect) to create an engine which works without change of the total entropy of the Universe? Would it be a perpetuum mobile if it ever existed? Could such engine exist if ideally reversible process would be achievable in principle? Would it violate any Thermodynamics Laws?

When you work so much with math , you lose the ability to understand physical meanings .And this can create a lot of issues to the development of physics.

In a particle reaction we take in account the conservation laws of mass-energy , charge , angular momentum , baryon number * and lepton number * I put an asterisk on baryon and lepton number because we are still unsure if those are conserved . If protons or electrons decay this would mean that the law is incorrect. Is the same thing applied for mesons ? I mean mesons and baryons are both hadrons so why there isnt a conservation law for mesons in particle reactions?

Apparently a photon rocket is the most promising engine for interstellar flight. https://en.m.wikipedia.org/wiki/Photon_rocket

Hi, I was reading electronics and I have a perception in my mind that potential difference is created by making the difference of electric charges on both ends. Higher potential is what means that there is more negative charge (More Electrons) and lower potential means there is more positive charge (Less Electrons). Due to the difference of charges the electric field is created (Negative to Positive -- Convention does not matter about the direction of Electric Field) and that cause the electrons to flow from the conductive wire. The more the difference the more energy the electron will flow. Now recently when I study how electricity is created and I came to kno…

Some interpret the 11 dimensions of string theory as "other worlds" that could host life. I've met many spiritual people who use that as a scientific validation for the "unknown". But as I've understood it, they are subatomic dimensions, that only exist within particles. So which one is it? Just to get it settled once and for all...

Please help me understand something: Is light energy also known as photons? When a current passes through a wire and creates a magnetic field around the wire, is the wire creating photons or photon energy as well as a magnetic field or are they the same thing: To help me understand the concept of this i need to picture it on a larger scale; It takes about 8 mins for the light from the sun to reach the earth, If you were able to make the sun completely vanish instantly, would the earth still receive light and stay in orbit for 8 minutes after the sun disappeared?

https://www.lenr-canr.org/acrobat/MizunoTincreasede.pdf Increased Excess Heat from Palladium Deposited on Nickel Tadahiko Mizuno Hydrogen Engineering Application and Development Company, Kita 12, Nishi 4, Kita-ku, Sapporo 001-0012, Japan head-mizuno@lake.ocn.ne.jp Jed Rothwell LENR-CANR.org, 1954 Airport Road, Suite 204, Chamblee, GA 30341, U.S.A. JedRothwell@gmail.com Abstract We have developed an improved method of producing excess heat with nickel mesh coated with palladium. The new method produces higher power, a larger output to input ratio, and it can be controlled effectively. With 50 W of input, it produces ~250 W of excess hea…

More of a food for thought question, but theoretically, could space expand into itself? As far as I understand it isn't expanding into anything particular, like some sort cosmic container. Just trying to conceptualize

So a while back (few years) I was reading about some physics stuff that honestly is over my head when I had an idea for a particle accelerator that would produce ridiculously high energy particles from a desk-top setup. I happened to not have even the most primitive lab set up so I called a university physics professor and had him try it, after he finished trash talking me. It worked. He stole credit for it. I don't care...much...grr. I want to play with it myself but I can't remember the damned thing! I recall it using some basic particle source such as a $10 ebay ionizer plus an odd accelerator of some sort. Laser something, high voltage gr…

I'm not a scientist and not sure if this is the correct location to post this, so please bear with me. Just these random thoughts come into my head, so I have to ask. I was reading about the inverse square law as it applies to light, and I have two hypothetical questions. 1. Assume there is a light source at one end of a long tube one million miles long, from which light could only escape through the opposite end. Would the intensity of the light be equal along the entire distance of the inside of the tube? 2. Now assume you place a mirror over the end. Would the intensity of light within the tube be ever-increasing? Thanks

https://www.symmetrymagazine.org/article/lhcb-discovers-matter-antimatter-asymmetry-in-charm-quarks "Matter and antimatter cannot coexist in the same physical space because if they come into contact, they annihilate each other. This equal-but-opposite nature of matter and antimatter poses a conundrum for cosmologists, who theorize that the same amount of matter and antimatter should have exploded into existence during the birth of our universe. But if that’s true, all of that matter and antimatter should have annihilated one another, leaving nothing but energy behind." That quote from an article detailing recent findings at the Large Hadron Colli…

https://phys.org/news/2018-07-reveals-great-pyramid-giza-focus.html?fbclid=IwAR0NqMZGJadrI9ygXaTiMPM8X9r75exyo-1fEbDr9VZp_fTHx1zZsxpK9Co Some loose internet research portrays phys.org as a credible site. There are some names and organizations listed near the bottom. But it reads like it was written by a middle-schooler and the nature of the article has borderline conspiracy tones to it. Pyramids and energy and what not. I dunno. Anyone have any input?

Any ideas from physicists that will replace spacetime? Will spacetime be replaced by some underlying material aether medium that light waves propagate on and visible matter as disturbances in the medium? There's superfluid vacuum theory but I don't know what the photons and matter is in the theory, and the speed of sound in the superfluid may exceed the speed of light. String theorists like Gross and Witten also predict the emergence of spacetime from something more fundamental. What evidence to date leads physicists to replace spacetime with something else?

Could a 50-kilogram antimatter bomb destroy a 720 km diameter asteroid?

I know you stopped my thread but this is infuriating. The poster said I should go back study the books and what not, but as has been already pointed out that is pointless, reading more will just produce the same result 'We don't know'. How the laws of the universe are everywhere is a mystery of physics and that is not my belief that is what I am being told. Now this mystery of how the laws are everywhere might not seem important to people on this forum and you can dismiss as something that is just not that important. But it might just be key to understanding the universe and reality.

Its the same people answering the posts so I just want to say my final piece. When I say magic, I don't mean God magic, I mean the magic a street magician does. You can see the trick being done (the laws of the universe are everywhere) but you don't know how the universe is pulling it off, so it occurs as if by magic, that is the explanation of modern physics. I have looked at the theories, they are sophisticated, I am not trying to dismiss them as nonsense. Its just that you want me to accept 'we don't know' and then wait until someone works it all out. As I say, I don't think you are stupid, but I don't think I am stupid either.

The laws of the universe seem to manifest in space when they are required and then seemingly disappear back into the same space when done. Where are the laws of the universe exactly?

can back emf be eliminated by using a spark gap to make the electricity independent after it jumps the gap? Well not really eliminate but to keep the back emf constant no matter the load?

Is it possible to direct lightning to something? Maybe bombarding an area with a line of opposite charged electrons then maybe lightning (or high voltage e-) can be directed to something. In other words, using e- as a projectile or a weapon or something... you get the idea.

Hey there! Does the wave the wave function that arises from the double slit experiment change based on the mass of the particle? For instance, is the wave that is created by sending electrons through the slits differentiations from that of the wave that arises from larger particles? Thanks, Isaac