首页
登录
职称英语
Assuming that the engineering problems could be overcome, the production of
Assuming that the engineering problems could be overcome, the production of
游客
2025-02-01
9
管理
问题
Assuming that the engineering problems could be overcome, the production of a time machine could open up a Pandora’s box of causal paradoxes. Consider, for example, the time traveler who visits the past and murders his mother when she was a young girl. How do we make sense of this? If the girl dies, she cannot become the time traveler’s mother. But if the time traveler was never born, he could not go back and murder his mother.
Paradoxes of this kind arise when the time traveler tries to change the past, which is obviously impossible. But that does not prevent someone from being a part of the past.
Suppose the time traveler goes back and rescues a young girl from murder, and this girls grows up to become his mother. The causal loop is now self-consistent and no longer paradoxical. Causal consistency might impose restrictions on what a time traveler is able to do, but it does not rule out time travel per second.
Even if time travel isn’t strictly paradoxical, it is certainly weird. Consider the time traveler who leaps ahead a year and reads about a new mathematical theorem in a future edition of Scientific American. He notes the details, returns to his own time and teaches the theorem to a student, who then writes it up for Scientific American. The article is, of course, the very one that the time traveler reads. The question then arises: Where did the information about the theorem come from? Not from the time traveler, because he read it, but not from the student either, who learned it from the time traveler. The information seemingly came into existence from nowhere, reasonlessly.
The bizarre consequences of time travel have led some scientists to reject the notion outright. Stephen W. Hawking of the University of Cambridge has proposed a "Chronology protection conjecture," which would outlaw causal loops. Because the theory of relativity is known to permit causal loops, chronology protection would require some other factors to intercede to prevent travel into the past. What might this factor be? One suggestion is that quantum processes will come to the rescue. The existence of a time machine would allow particles to loop into their own past. Calculations hint that the ensuring disturbance would become self-reinforcing, creating a runaway surge of energy that would wreck the wormhole. [br] The information about the new mathematical theorem seems unreasonable in that ______.
选项
A、it is given by the time traveler
B、it is written by the traveler’s student
C、it still needs evidence t prove
D、it seems that there is no source of the information
答案
D
解析
细节题型见第三段中的例子及最后一句:这个信息似乎不合理,也就无法成立。因此D为答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3938032.html
相关试题推荐
Assumingthattheengineeringproblemscouldbeovercome,theproductionof
Assumingthattheengineeringproblemscouldbeovercome,theproductionof
Assumingthattheengineeringproblemscouldbeovercome,theproductionof
Assumingthattheengineeringproblemscouldbeovercome,theproductionof
Hisemotionalproblems______fromhisexperiencesasachild,Ithink.A、stemB、fl
Nuclearpower,withallitsinherentproblems,isstilltheonlyoptiontoguara
Hisproductiontechniquesareelaborateandnearlegendary,buteveniftheycou
WhentheErieCanalwasbuiltinthe1820’s,itwastheengineeringmarvelofit
Hisemotionalproblems______fromhisexperiencesasachild,Ithink.A、stemB、fl
WhentheErieCanalwasbuiltinthe1820s,itwastheengineeringmarvelofits
随机试题
Accordingtothereport,Beijing’sairportsaw______percentlinerssuspended.[
设函数,且,则a=________.
文件传输协议(FTP)使用TCP服务。
老年患者使用头孢菌素易引起的不良反应是:()A.肝损害 B.肾功能下降
下列关于应用价格指数法估算重置成本的说法中,正确的有( )。A.价格指数法是利
预期损失是指在( )内投资组合损失的期望值。A.未来预期区间 B.置信区间
Thechangeinthatvillagewasmiraculou
热力管道土建结构顶面与公路路面基础的最小净距离为()。A.0.5m B.
注浆法施工中的注浆工艺参数包括()。A.注浆量 B.注浆泵压力 C.注浆压
某建筑公司与某建设单位签订了施工总承包合同,该项目的施工技术难度比较大,建设工期
最新回复
(
0
)