Post by TidusandYuna1983 on Dec 12, 2017 9:33:52 GMT
Physicists are divided as to whether time really exists as we think of it. Physicists like to use the term 'proper time',which is what we can measure on a clock. However,as to whether time is some flowing mechanism that can slow down,speed up or rewind events is debateable.
When 2 observers that are moving observe an event,they will observe the event happening in a different chronological order,being in a different location,and lasting for a different duration of time. However,neither observer is incorrect,their measurements are their own frame of reference and are affected by time dilation and length contraction.
Because of this,some physicists believe that someone else's past is someone else's future. The future is already preset,and there is no free will. There is no flowing timeline,and we are the timeline. Everything that leads from our birth to our death happens because we are objectively linked to a set of events happening within space.
Understandably,this sort of thing depresses people. No free will contradicts religions stating a God gives us free will and lets us choose our own destiny. This could also mean the reason why we wonder why there's so many stupid people in the world is because they are merely following their own sequence of events which makes up their objective reality,and they have no control of it. If there's infinite universes,and infinite sets of events(which quantum mechanics indicates),this means some people are unfortunately stuck on the path of being a stupid person,or a hot-headed Arab.
Speaking of sequence of events,this relates to the question,can we travel backwards in time? If time isn't a flowing mechanism,and is rather a set of events,then we would need to somehow travel to before an original frame of reference. One theory of how we can do this is if we somehow travel faster than light,because a theory is if an observer in space is watching an event happening on Earth(which means the reflecting light will need to take time to travel to the observer)technically he is witnessing an event in the past,and if a beam of light from Earth moves past where he is,if he travels faster than light and flies into the beam,he will witness before the original point of reference(he will witness an event before it happened).
However,while some physicists agree we can observe an event before it happened by travelling faster than light,we actually aren't travelling back in time,but are just observing an event before the original frame of reference.
Another theory is if you travel faster than the speed of light,everything will be infinitely slowed down(your heart beat,thought processes and the starship itself).
It's all about frame of reference. Or as a wise old Jedi once said... "You're going to find that many of the truths we cling to depend greatly on our own point of view."
Yep.For the laws of electromagnetism to work,we need to measure each frame of reference separately,because we can only measure what we can actually observe.Since time is a form of measurement we use to measure events and velocities,it means different observers that are moving will measure a different amount of time that has gone by,as well as a different speed and chronological order for that event.
Post by TidusandYuna1983 on Dec 19, 2017 15:10:48 GMT
Physicists say we're not living in a computer simulation,because the computing power required to create an artificial universe that's the size of the one we're living in would be impossible,due to the amount of particles and atoms needed.
The sci-fi trope might now be put to rest after scientists find the suggestion that reality is computer generated is in principle impossible, writes Andrew Masterson.
Just in case it’s been weighing on your mind, you can relax now. A team of theoretical physicists from Oxford University in the UK has shown that life and reality cannot be merely simulations generated by a massive extraterrestrial computer.
The finding – an unexpectedly definite one – arose from the discovery of a novel link between gravitational anomalies and computational complexity.
In a paper published in the journal Science Advances, Zohar Ringel and Dmitry Kovrizhi show that constructing a computer simulation of a particular quantum phenomenon that occurs in metals is impossible – not just practically, but in principle.
The pair initially set out to see whether it was possible to use a technique known as quantum Monte Carlo to study the quantum Hall effect – a phenomenon in physical systems that exhibit strong magnetic fields and very low temperatures, and manifests as an energy current that runs across the temperature gradient. The phenomenon indicates an anomaly in the underlying space-time geometry.
Quantum Monte Carlo methods use random sampling to analyse many-body quantum problems where the equations involved cannot be solved directly.
Ringel and Kovrizhi showed that attempts to use quantum Monte Carlo to model systems exhibiting anomalies, such as the quantum Hall effect, will always become unworkable.
They discovered that the complexity of the simulation increased exponentially with the number of particles being simulated.
If the complexity grew linearly with the number of particles being simulated, then doubling the number of particles would mean doubling the computing power required. If, however, the complexity grows on an exponential scale – where the amount of computing power has to double every time a single particle is added – then the task quickly becomes impossible.
The researchers calculated that just storing information about a couple of hundred electrons would require a computer memory that would physically require more atoms than exist in the universe.
The researchers note that there are a number of other known quantum interactions for which predictive algorithms have not yet been found. They suggest that for some of these they may in fact never be found.
And given the physically impossible amount of computer grunt needed to store information for just one member of this subset, fears that we might be unknowingly living in some vast version of The Matrix can now be put to rest.
There is a caveat to this conclusion: if our universe is a simulation, there is no reason that the laws of physics should apply outside it. In the words of Zohar Ringel, the lead author of the paper, “Who knows what are the computing capabilities of whatever simulates us?”
Personally,I think it might be possible to create an artificial universe,if we can find a way around energy conservation laws and thermodynamics. We also still have little understanding about the quantum universe,dark matter/energy,and who knows how much energy we could create using dark energy and the power from black holes.
Even if we're not living in a computer simulation,science still points to us having no free will because of causality. Maybe we should hope we are living in a computer simulation because at least our programmers might read our minds,and feel sorry for some of us,and make our lives better... In a sense,that could be a way we could control our destiny if we were in a computer simulation.
Post by TidusandYuna1983 on Dec 23, 2017 15:05:00 GMT
So,civilizations trillions of years from now will need to collect as much matter as they can find,and feed it to black holes as an energy source,because the matter in the universe is decaying,so stars will stop being born. Living near a black hole will slow down time,so you could live near a black hole for billions of years,but time will seem normal to you,but slower externally. This is a way we could make mechanical/chemical/biological systems run for a much longer time,and matter decay near the black hole will happen more slowly.
It's believed the universe will reach a state of thermodynamic equilibrium,where energy and matter will no longer flow.Perhaps civilizations billions of years from now will find a way around energy conservations laws,and can create particles needed to create energy and matter out of nothing. Or,we could travel to another,younger universe. To make things more crazier,a 'Boltzmann brain' (which is a non-corporeal sentience),is believed to be a possibility, and is believed to be more likely created in a universe that is in a state of thermodynamic equilibrium,and has high entropy,because there is either more randomness,or a universe in a state of thermodynamic equilibrium will be older,and since there's a limited number of ways particles can arrange themselves,given enough time,they will form a Boltzmann brain,and our low entropy universe is within a Boltzmann Brain.