Black Hole
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ওয়ার্মহোল বিষয়ে একটা কথা । স্টিফেন হকিং একবার বলেছিলেন, কোন দ্বিমাত্রিক বা ত্রিমাত্রিক বস্তু পুরোপুরি নিখুঁত বা মসৃণ নয় । খুব সূক্ষ্মভাবে হলেও তাদের মাঝে কিছু সূক্ষ্ম সূক্ষ্ম উঁচু নিচু বা খসখসে ভাব থাকবেই । অর্থাৎ পুরোপুরি মোলায়েম হবে না । এমনি ভাবে আমাদের চতুর্থ মাত্রা, বা সময়েও কিছু ফাটল দেখা যায়, যেগুলোকে পদার্থবিজ্ঞানের ভাষায় 'ক্র্যাক' বলে । আমার প্রশ্ন এই ক্র্যাকগুলো কি ওয়ার্মহোল ?
Last edited by Phlembac Adib Hasan on Thu Jan 17, 2013 12:59 pm, edited 1 time in total.
Reason: Transliterated, credit: nafistiham
Reason: Transliterated, credit: nafistiham
Re: Black Hole
মহাকর্ষ বল মূলত স্থান এবং সময়ের বক্রতা। সুতরাং মুক্তিবেগও সেই বক্রতার পরিমাণ দ্বারাই নির্ধারিত হয়। বক্রতা বেশি হইলে মুক্তিবেগও বেশি হবে। আলোর সাথে এর সম্পর্ক হইল, শূণ্য মাধ্যমে আলো সবসময় দুইটা বিন্দুর মধ্যে ক্ষুদ্রতম দূরত্বের পথে চলে। স্থান-কাল যদি বক্র হয় তাইলে আলোর এই গতিপথও বাঁকতে থাকে। ব্ল্যাকহোলে বক্রতাটা এত বেশি যে আলোর গতিপথটা পুরাপুরি ব্ল্যাকহোলের মধ্যেই আবদ্ধ হয়ে যায়।
- Phlembac Adib Hasan
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Re: Black Hole
I can't read what he wrote.Moderators, please translate it.Adnan Shahriar wrote:worm hole bisoye 1ta kotha, hawkin 1bar bolcilen, kono dimatrik ba timatrik bostu puropuri nikhut ba mosrin noy. khuuuuub sukkho vabe holeo tader majhe kisu sukkho sukkho uchu nichu ba, khoskhosa vab thakbei.. puropori molayem hobe na.. emni vabe amader 4rth dimension, ba tym eo kisu fatol dakha jay, jeguloke physics er vasay Crack bole.. amar prosno, ei Crack gulai ki warm hole????
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Re: Black Hole
Please, write either in Bangla or in English. Don't write in this way . I couldn't understand them all. They are very painful.
Yesterday is past, tomorrow is a mystery but today is a gift.
- nafistiham
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Re: Black Hole
Let me tryAdnan Shahriar wrote:worm hole bisoye 1ta kotha, hawkin 1bar bolcilen, kono dimatrik ba timatrik bostu puropuri nikhut ba mosrin noy. khuuuuub sukkho vabe holeo tader majhe kisu sukkho sukkho uchu nichu ba, khoskhosa vab thakbei.. puropori molayem hobe na.. emni vabe amader 4rth dimension, ba tym eo kisu fatol dakha jay, jeguloke physics er vasay Crack bole.. amar prosno, ei Crack gulai ki warm hole????
ওয়ার্ম হোল বিষয়ে একটা কথা । Stephen Hawkins একবার বলেছিলেন, কোন দিমাত্রিক বা ত্রিমাত্রিক বস্তু পুরোপুরি নিখুঁত বা মসৃণ নয় । খুব সূক্ষ্ম ভাবে হলেও তাদের মাঝে কিছু সূক্ষ্ম সূক্ষ্ম উঁচু নিচু বা খসখসে ভাব থাকবেই । পুরোপুরি মোলায়েম হবে না । এমনি ভাবে আমাদের চতুর্থ মাত্রা, বা সময়-এও কিছু ফাটল দেখা যায়, যেগুলোকে পদার্থবিজ্ঞানের ভাষায় Crack বলে । আমার প্রশ্ন এই Crack গুলো কি ওয়ার্ম হোল ?
[banglish থেকে ভাবানূদিত ]
\[\sum_{k=0}^{n-1}e^{\frac{2 \pi i k}{n}}=0\]
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Black Hole and Time
The notion of time is perhaps the most intriguing thing in human experience. And modern science has only added a new approach to understand, if not successfully explained, the notion.
Let us assume that black holes certainly exist with all their unusual properties, including time dilation. Let us further assume that you and your friend are gradually approaching to a black hole’s event horizon, which is the point of no return. You are closer to the black hole than your friend. General theory of relativity says that time will flow more slowly to you than to your friend because of the black hole’s gravity.
But what this actually means? It means that if you and your friend have a clock each, then you will see your friend’s clock ticking faster than your clock and showing different time, although both clocks initially had the same synchronized time. Perceptually however you would not feel anything unusual in the ticking rate of your clock.
Now does the different ticking rates of two clocks really mean that time has passed slowly for you compared to your friend! But this would mean that your perception of time is defined by just two manufactured devices, devices that may behave differently, albeit consistently, under the influence of gravity, thus giving different times for you two, while in reality the same amount of time may have elapsed for both of you.
Unless we know precisely how human thinking process, mental perception, chemical reactions in body cells, biological aging process, among others, are influenced by gravity, we cannot conclude that time has slowed for you.
Let us assume that black holes certainly exist with all their unusual properties, including time dilation. Let us further assume that you and your friend are gradually approaching to a black hole’s event horizon, which is the point of no return. You are closer to the black hole than your friend. General theory of relativity says that time will flow more slowly to you than to your friend because of the black hole’s gravity.
But what this actually means? It means that if you and your friend have a clock each, then you will see your friend’s clock ticking faster than your clock and showing different time, although both clocks initially had the same synchronized time. Perceptually however you would not feel anything unusual in the ticking rate of your clock.
Now does the different ticking rates of two clocks really mean that time has passed slowly for you compared to your friend! But this would mean that your perception of time is defined by just two manufactured devices, devices that may behave differently, albeit consistently, under the influence of gravity, thus giving different times for you two, while in reality the same amount of time may have elapsed for both of you.
Unless we know precisely how human thinking process, mental perception, chemical reactions in body cells, biological aging process, among others, are influenced by gravity, we cannot conclude that time has slowed for you.
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Re: Black Hole
Anything can happen inside a blackhole.It has effect on spacetime as time and space are only different perspective.Even new Big bang can be happened inside a black hole(Very crazy idea).
According to some law time is not steel needed to describe our universe and question arises:What is time?