Peshev, AsenMs. RousevaPhysics Profile 10/B6th January, 2018Direction of TimeAbstract:    The time and the possibility to time travel were always topics of curiosity among all people. The idea of time travel hides many capabilities beneath its existence yet it also gives birth to some paradoxes, or things that contradict themselves. Time, as people know and experience it, has a direction, therefore letting us experience our lives in a consistent manner, meaning that events do do not happen simultaneously, but rather successively. The direction of time can very well be explained by the Arrow of Time which works by the Second Law of Thermodynamics, which states that as time goes forward, the net entropy in any system will always increase or stay the same, meaning that it will always get from more ordered to more disordered.

Many modern films and people touch on the topic of changing the direction or traveling in time. This topic on its behalf leads to two very famous theories describing the time as linear and nonlinear. The linear time consists of one line of events, which can in no way be changed. The nonlinear time theory on the other hand consists of many different timelines each new one created with every unique decision or action.Introduction:    While obviously an enormous part of the lives of the people and the existence of the universe, the time is a surprisingly mysterious topic for people. They are using many units to describe time yet many don’t know anything about it. Why is time going only forward? What might happen if time were to be disturbed? How can a small change in the past affect the future? Some of those questions do have a known answer for us, some are theorised about and others are leading to confusing scenarios. There are few facts scientist know for sure about time, one of them being about why is the Universe progressing and ‘moving’ forward in time as it is.

The article aims to answer and think about many of these questions as it also aims to explain the concept of linear and nonlinear time.Discussion:    The Arrow of Time, first brought up by Sir Arthur Eddington back in 1927, follows the Laws of Thermodynamics which explain the heat and temperature and their relation to energy and work, and more specifically it follows the Second Law of Thermodynamics, stating that as time goes forward the net entropy never reduces, but rather increases. The Entropy means ‘degradation’ and refers to the running down trend to disorder, or in other words, it refers to something located in a close system getting from more ordered to more disordered. The Arrow of Time and its relation to entropy can very well be described with an example of an old house. As the house gets older it starts to break apart and to return to its initial materials used to build it. The materials on the other hand won’t become into a house on themselves.

This represents different closed systems in the Universe, which from more ordered state transforms to more disordered state as time goes by. From this already proved statement though arises a question not yet answered by scientists, which asks why was the Universe perfectly ordered on its creation to begin with. Only when this question is answered will we know why is time going from the past to the future. Time is believed to be linear or nonlinear.

The difference between the two is that, a linear time consists of events that cannot be changed. Paradoxes like the Grandfather paradox, which tries to discover what were to happen if someone kills his ancestor back in time, show that the theory of linear time does not support things like time travel and time anomalies, as this would create an infinite loop of events not corresponding to each other. On the other hand the nonlinear time theory talks about the existence of many different timelines all formed from different possibilities. The idea of the nonlinear time theory is that a new timeline is formed with every decision and action performed, believing in the existence of many similar and much different timelines all running in the same time.

This theory solves paradoxes like the Grandfather paradox, as it offers a direct solution which in this case is that by killing his ancestor, a man simply creates another timeline. The theories describing the quantity of timelines are though highly theoretical and unproved, they are mostly discussed by the modern media as they are born by the idea of travelling in time and the many scenarios that would give birth to. Some other time paradoxes and effects, are the butterfly effect, which states that even the smallest change (like killing a butterfly) may cause a drastic change in the universe. And the last one is the Predestination paradox, which states that by trying to stop an event from happening back in the time, we cause it. This idea can be explained with the film Terminator, where by going back to time to stop the robots from being created, the characters create the robots on the first place by bringing in new technology. In this paradox, the technology, or event brought back in time has no origin, and exists without practically being created.

Conclusion:    Time is only going forward because of the entropy in every closed system. Yet this does not give an answer to weather the time is simply a linear sequence of events or a more complex phenomenon we can only speculate about. This article only aims to explain the direction of time as far as people understand it and to give some of the theories people have about time.

In the end, people don’t really know all that much about it, yet they have many speculations and interesting paradoxes which give birth to theorie


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