Relativity

Hi! I'm an amateur writer and one of my stories runs on the premise of time dilation. I was wondering if there are any experts here who can answer my questions. So we have Earth and what we will call Planet X on opposite sides of the LIC. Now, in my story, citizens of Planet X travel to Earth, but when they come back they realize they have experienced some time dilation (7 Earth years to about 25 Planet X years). Assuming travel between both planets was instantaneous (magikz), what kind of explanation would I have to give to avoid making a plot hole? I know time dilation is caused by gravity differences, but can the stars these planets are going around cause …

General relativity states that, time ticks slower when you get closer to a gravitational point in space. But can time actually reverse? I mean it's not impossible.

hey so ive had this idea running through my head for a while now if relativity is true then spacetime has to have mass and if does then what is it made of? if it has mass then why cant we see it? why dont we know tis there? i believe that it is a simple solution. it is dark matter plain and simple. dark matter is not just dark matter but gravity and gravity is dark matter its similar to spacetime where space and time are not seperate but one and the same. just like dark matter and gravity. not diffrent but the same. and so it makes alot of sence why we have trouble finding dark matter. and the only reason we really know its there in the first place even though its invisi…

I got a, pretty much amateur conjecture i deem of interest for the educated people around here. As we know, the closer a massive body approaches c, the more mass it gains. Now as much as I know, volume isnt subject to change here (correct me if im wrong), so the only value that increases here is density. The asymptotic nature of this scenario means that there is no limit to how much mass a massive particle can gain as it approaches light speed. So my conjecture is this: wouldnt any particle or body with mass become a black hole when it reaches a certain percentage of light speed?

Interested to hear what the review on these papers is here. Have just begun reading them so I don't have any questions as yet. Cosmology from quantum potential http://www.sciencedirect.com/science/article/pii/S0370269314009381 http://arxiv.org/abs/1404.3093v3 Dark Matter and Dark Energy from Bose-Einstein condensate http://arxiv.org/abs/1411.0753

Why anytime I ask explanations about it I hear always the same excuses "if I don't understand it's because it's too complicated...blah blah". Why nobody can explain Einstein easily or simply? There is nothing difficult in this world if someone explain it properly. This theory sounds like useless bombast. I haven't seen any fact yet, not a single acceptable proof. There is nothing to understand because there is no substance, just castles in the air. Nothing of what he said has been clearly proven. All we got now it's not because of Einstein: computers, rockets, fridges, televisions, robots, electricity, cars, radio. Why everybody understand Darwin, Marconi, Newton? Beca…

What are the main principles for both theories that everything else branches off?

Why can't gravity be the fourth dimension? No one says it is so I assume that it is already been dis proven, but really, with the theoretical Graviton particle allowing atoms to be effected by the gravitational dimension, dosn't every thing seem to fall in to place? It seems to make sense with my limited high school knowledge, + youtube videos. Couldn't the part of an atom that weighs it down be the graviton, allowing the particle to interact with the gravitational dimension, then the protons and neutrons allow the atom to interact with the physical, 3d space dimension, then other particles of the atom would allow the it to interact with other dimensions. So if one could …

A friend and I are in a debate about relativity. He thinks he's found a paradox that overturns SR. I'm a little more skeptical. Here's the thought experiment: You have a train at rest. You set it up with a stop-clock at the exact center of the train. You are standing there at the exact center of the train with the stop-clock. In your hands you hold two more stop-clocks. You synchronize them. You hand them to two assistants. They casually walk, at the same time and at the same rate, to each end of the train and place each stop-clock there, then leave the train. The stop-clocks at the ends of the train are set to emit a flash of light at a pre-determined time. That pre-det…

Say there were no photons, and therfore no light, though electromagnetism is otherwise unaffected. Would a "light" barrier still hold? I understand the question is extremely simplistic.

This is the kind of question someone would ask who does not understand enough about the topic - e.g. Me. Nevertheless, the question is sincere. Have all of Einstein's theories about relativity been proven to the satisfaction of all professional scientists? In other words, does everyone who thoroughly understands what Einstein is saying and is able to test his theories agree with him? Or are there scientists who have other theories that contradict Einstein? Thanks.

Why travel at superluminal speeds equals to time travel to the past? P.D: Elaborate as you see fit, verbally (colloquially and/or terminologically) and/or mathematically

I just had a small question about relativity. Say there is a universe that happens to have the exact same physical constants to our own except 1, their c is equal to 2 times our c. Could such universe permit particles with mass to travel at speeds that are considered superluminal to our own universe?

Hi everyone! This may be a silly question but anyway here goes. So with Einstein cross we have a quadrupled image of a distant quasar which happens due to gravitational lensing by a nucleus of a spiral galaxy in the foreground. Why do we see 4 distinct images of the quasar? I mean, if a quasar is sort of directly behind the lensing galaxy and if the gravitational field of galactic nucleus is more or less uniform I would expect to see a blurred circle, not 4 separate images. What am I missing here?

I have been thinking about a way to explain the twin paradox, I came across a video where both twins have synchronized clocks that emit a light pulse every 1 minute. When they are moving apart, both the earth twin and the spaceship twin experience doppler shifted pulse of 2 minutes.(v = 0.87c). Then when the spaceship twin turns around, he experiences doppler shifted pulse from the earth every 30 seconds. The earth however, still receives the the 2 minute pulses until the information that spaceship twin has turned around reaches them (depends of distance), after which earth also receives 2 minute pulses. When the twins gets back together, both agree that earth twin se…

is used to calculate the energy of moving objects; true or false? E^2=(MC^2)^2+(PC)^2 is used to calculate the energy of objects that are not moving; true or false? E=MC^2 So, or both formulas correct? I've been pondering over this...

If you wish me to conform to your perception that physics discussion MUST INVOLVE MATH swansont, I request that you provide me a sequence of formulae from basic to complex to properly assess my capacities. You provide a question that requires application of a physics formulae to answer and I will research each and provide you an answer with working shown. I have not approached this subject from the conventional norm. This does not mean that I am seeking alternate theory or that the exercise I have employed to absorb theory doesn't conform to standard theory. You cannot expect me to satisfy your apparent lust for maths if you don't provide me material you deem suitable to …

Hey, I'm completely new to the concept of relativity and I'm want to teach myself it as it is necessary to advance further into what I want to learn in the near future. I know the basic idea of what it is but I'd appreciate if someone could give me a more thorough top to bottom of what [ the theory of ] relativity is. Examples of it would be very much appreciated, and even better would be if you could suggest ways that I can practice it. Feel free to use advanced vocabulary in your descriptions as I'll need to learn them anyways and will most likely be googling them and taking notes about them so fear not for my young mind. Thanks! -Devin of Byzantium

Hi I am new to this forum and am currently in year 12 at high school. We are in the middle of learning about relativity in Physics class and i came across a question my teacher couldn't answer. I understand that when an object starts to reach a velocity near that of light, it reaches a point where its kinetic energy cannot increase any further so instead the energy is converted into mass. And that to the person in the craft going light speed there wouldn't be any noticeable change in mass however to an outside observer there would be a mass change. My question is, if the person in the craft going light speed can't see a change in mass, and they obviously can't go …

A friend asked an interesting question about length contraction that I didn't know the answer to: as we know, the faster an object travels, the more it's length contracts. But what happens when you have two objects travelling, one behind the other, at the same rate at the same time? For example, two trains on a track, one behind the other, and they both start moving at the same rate at the same time. What is the center point around which length contraction occurs. Does each train contract around its own center, or can both trains be considered one object and their collective length contracts around the mid-point between them? Another way of asking this is: what counts…

I'm reviewing physics after ~30yrs of neglect, starting with Halliday & Resnick (and the internet). Here's what I understand to be standard Newtonian/classical inertial frames: 1. There exists a set of reference frames, called inertial frames, in which mass, time, force, acceleration, etc. are (Galilean) invariant but position, velocity, translational and angular momentum, work, kinetic energy, etc. aren't. 2. Measurements in one inertial frame can be converted into measurements in another frame by a Galilean transformation of coordinates. 3. All inertial frames are in relative rectilinear motion. 4. Any two frames are inertial if and only if they measure…

Why is the compression value of vacuum not considered the cosmological constant? Is it not vacuum tension that distributes kinetic energy?

Does dark energy obey Einsteins mass-energy equation E = mc2,, I was just curious to know ? If it does then how ? Thanks in advance.

On average, how much younger than the average person would people who have made the following career choices be, by the time they retire? Fighter/test pilot Formula1 driver Top Fueler driver

Hello! Subject: Violation of energy conservation in (special) relativity. Possible? plausible? not possible? What is your opinion, and why? Best Regards!