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"Time Travel"，As a long -lasting topic in physics and philosophy，I have raised many technical and standardized problems。When we use the concept of "time travel" on the meaning level of "returning to the past"，It will face many unspeakable paradox。In these paradox，Grandfather Paradox (Grandfather Paradox) has received wide attention。Foreign grandfather paradox refers to a time traveler returns to the past，And killed his grandfather before his mother was born，Time paradox caused by this behavior。Logically，This time travelers can not exist without his mother's birth，It is impossible to be in the case of his existence，Back to the past to kill his grandfather。On the one hand, this problem has strongly proved the time on the meaning of "returning to the past"，On the other hand, it involves philosophical problems such as causality and decision theory，Whether in physics，Still in philosophy，There are important theoretical value。

　　There are logical problems

Paradox for foreign grandfather，Physicists give three answers to。The first solution is the fate of fate，Decisure the free will during the trip，Think that even if we return to the past，It is impossible to change anything in the past。The second solution is called banana skin mechanism，This theory believes that returning to the past time is logically possible。but，When a traveler wants to kill his grandfather，It will always be tripped Bet365 app download by a banana skin，So no matter what，Can't kill his grandfather。The third solution is the "Multi -World Interpretation of Quantum Mechanics" published in "Modern Physics Review" in "Modern Physics Review" in 1957 in 1957.，Also known as the theory of parallel world。This theory advocates countless multiple parallel worlds，The past where the time returning when traveling is not the past of the original world，Instead, it belongs to the past of another parallel world，Grandfather in another parallel world is killed, which does not affect the birth of a traveler in this world，So the existence of the traveler at this time does not constitute a paradox with his grandfather。These three solutions have more or less deficiencies。

First，The first solution admits the possibility of time travel，But denied the possibility of changing the past，This is a kind of view -like perspective。Although this view can help time travel theory avoid permits，But it is difficult for us。From this，We can't help asking: Time to travel at this level，Is it physical or spiritual?

Next，The second solution，In fact, it is actually the weak version of the first solution，That is, we can return to the past，Make some changes，But when the changes we make will cause time paradox，Any change will be corrected by natural order and historical order。This view still has a kind of fate theory，And without recognizing the "banana skin mechanism"，Nature and history can already run well，So is it necessary to accept this mechanism? This is the best explanation explanation question，In many hypotheses，If a hypothesis can explain the problem most reasonably for the least reason，So bet365 Play online games we can temporarily see this hypothesis as the best explanation of the problem。

Last，The third solution actually denies the linear time travel，That is，but a parallel universe，Any change made in the parallel universe is for our current experience world，It is meaningless，that is not causal effects。This explanation has challenged the possibility of time travel。other，This explanation is also facing virtual reality challenges。In a computer program design as a virtual space of the past world，If we can't tell whether this is a parallel world or a virtual real world for time to travel，So,Does this world mean a parallel world? If there is no difference in the past through the virtual reality and through the time machine，Then the time under the interpretation of the multi -world interpretation of quantum mechanics lacks its necessity，Because of the time machine pursuing time machines to travel，It is better to pursue creating a better virtual reality program。

The above three classic solutions，Try to solve the paradox of foreign grandfather under the premise of admitting the possible travel of time，But facing challenges of fate theory and virtual realistic thought experiments。Obviously，These three solutions have not solved this logic problem，At the same time, facing new challenges。

　Facing philosophical challenges

Although there are certain problems in the above solutions，But it has a basis for physics、May be achieved。Therefore，We also need to discuss the metaphysical and physical mechanisms behind these three classic solutions。

First、Both solutions are facing challenges of free will and fate theory，David Lewis (David Lewis) has tried to interpret the possible mechanisms bet365 best casino games of these two decisive plans from the perspective of school，The principle of the same nature of the relationship between the relationship between the language and the world is more reasonable，At the logical level，Back to the past time, a traveler may violate the logic，That is, this behavior will not happen。other，According to the paradox of foreign grandfather，We returned to the past with the help of time machine，On the basis of this, there is a free will to kill the grandfather。If we assume，The process of time travel will affect free will。In this assumption background，Due to the absence of free will，Traveling from the moment to the past will be no longer possible。This conclusion is pointed out by Oleg Yurjevich Kupervasser，In his opinion，The instability of the process of entropy and the corresponding thermodynamic time arrows make the existence of allowing the initial conditions to be allowed to return to。This means，In a single universe，Traveling from the moment to the past time is facing the challenge of free will，conflict with the second law of thermodynamics。So，First、Two solutions are difficult to establish。

About "Multi -World Interpretation of Quantum Mechanics" theory，In this theory，We are back to a parallel world similar to our past。At the level of school and school，Time traveler enters another world through time machine，His memory and free will can still tell him，This is a world that is different from his original world，The grandfather he saw and the others in this world will not have any impact on the original world，Kill the foreign grandfather，It will not cause time paradox，Because he killed, it would not be his grandfather，Or the corresponding body bet365 live casino games of his grandfather in another world。

At the physics level，"Multi -World Interpretation of Quantum Mechanics" theory is closely related to the theory of quantum mechanics。Richard Phillips Feyman has proposed the explanation of positive electrons to move backwards，Many philosophers and scientists know the possibility of traveling for time。but but，According to the discussion of Curvasser，At the physics level，It is impossible to return to the past in the state of a macro object，We return to the past in the state of a particle，This means the birth of a philosophical problem，Time of re -combination in the parallel world and whether the self that exists in the original world is still the same self。This is the time of the trip to the boat of the Zheus boat，And this version is stronger on the original。One aspect，Time Traveler disappears from the current world，I came to a parallel world; on the other hand，According to quantum mechanics multi -world theory，Once in a special world，Can't perceive the existence of other worlds，So，Arrive such a parallel world，Time Traveler can not guarantee that the world's self is still the original self，I can't know that this is a new parallel world，This parallel world will be very weird。

　　Can't achieve it in the past

In the process of solving the paradox of foreign grandfather，The first problem we face is，The past world is the decision theory，Or is it not determined? The first solution advocates that the past was determined，We are powerless to change the past; the second solution considers that the past is incomplete decisive theory，On some issues that cause time paradox，Our past will be decisive; the third plan advocates that our past is wrong and wrong，But in fact we are not our past，but bet365 live casino games a parallel world，This not only eliminates the paradox of grandfather，Also eliminated time travel。Under the theory，Only under the absence of multiple possible worlds，Time travel is possible。So，In the linear space -time without possible world，It is impossible to travel to the past time。

These three solutions all indicate，In a single world，If the past is wrong，Then you will face the problem of foreign grandfather paradox。Therefore，Solving the simplest way to solve the paradox of foreign grandfather，is to admit past decision theory，That is, once our current becomes the past is the decision theory，Can't change。Hawking has proposed the "sequential protection conjecture": the law of physics will prevent the construction of the time machine used to go to the past。Bernard Kay、Marek Radzikowski and Bob Wald have proposed a math demonstration，Prove the timing protection conjecture。

Back to and change the past，This idea is similar to permanent motor，It is a long -term beautiful idea of ​​human beings。But in fact, if it can be achieved，Back to the past will cause unimaginable consequences to our current and future。The past was the decision theory，Our now will be stable，Our future will be realistic，Change the past actually means destroying the present。

To sum up，If the time travels back is the true sense of the past, what we have experienced，So，Back to the past time travel will not exist for us now。In the online world，Our past is the decision theory，Can't return to the past，Then the grandfather's paradox will not exist。The theory of combining physicists，Philosophical hair micro，The purpose is to perform a metaphysical analysis，This may help physicists bet365 best casino games to further promote time travel in time to protect conjecture and other fields。

　(Author Unit: School of Philosophy and Social Development of Overseas Chinese University)