In theoretical physics, the problem of time is a conceptual conflict between general relativity and quantum mechanics in that quantum mechanics regards the flow of time as universal and absolute, whereas general relativity regards the flow of time as malleable and relative. This problem raises the question of what time really is in a physical sense and whether it is truly a real, distinct phenomenon. It also involves the related question of why time seems to flow in a single direction, despite the fact that no known physical laws at the microscopic level seem to require a single direction. For macroscopic systems the directionality of time is directly linked to first principles such as the second law of thermodynamics.
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| - Problema del tempo (it)
- 시간의 문제 (ko)
- Problem of time (en)
- 時間問題 (zh)
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| - In theoretical physics, the problem of time is a conceptual conflict between general relativity and quantum mechanics in that quantum mechanics regards the flow of time as universal and absolute, whereas general relativity regards the flow of time as malleable and relative. This problem raises the question of what time really is in a physical sense and whether it is truly a real, distinct phenomenon. It also involves the related question of why time seems to flow in a single direction, despite the fact that no known physical laws at the microscopic level seem to require a single direction. For macroscopic systems the directionality of time is directly linked to first principles such as the second law of thermodynamics. (en)
- Nella fisica teorica, il problema del tempo è un conflitto concettuale tra relatività generale e meccanica quantistica in quanto la meccanica quantistica considera il flusso del tempo come universale e assoluto, mentre la relatività generale considera il flusso del tempo come malleabile e relativo. Questo problema solleva la questione di che cosa sia realmente il tempo in senso fisico e se sia veramente un fenomeno reale e distinto. Implica anche la relativa domanda sul perché il tempo sembra scorrere in un'unica direzione, nonostante il fatto che nessuna legge fisica nota a livello microscopico sembri richiedere un'unica direzione. Per i sistemi macroscopici la direzionalità del tempo è direttamente collegata a concetti primitivi come il secondo principio della termodinamica. (it)
- 理論物理學中，時間問題乃廣義相對論與量子力學間對於時間的概念衝突。量子力學中，時間的流動被視為絕對與同一的；廣義相對論中，時間的流動則是相對且受到環境的影響。此一問題涉及了物理學中，時間究竟為何？它是否是一真實存在、獨一的現象。另外時間似乎只有單方向的流動也是一個探討的主題，儘管目前不存在有一微觀的物理定律要求時間的單一流向。對巨觀系統來說，時間的流向則直接連結到一些第一原理，比如熱力學第二定律。 (zh)
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| - vocabulary needs to be explained: diffeomorphism, Hamiltonian, Dirac observables, perennials, partial observables. Need to illustrate with example (en)
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| - Geons, Black Holes, and Quantum Foam, p. 235 (en)
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| - Spacetime tells matter how to move; matter tells spacetime how to curve. (en)
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| - In theoretical physics, the problem of time is a conceptual conflict between general relativity and quantum mechanics in that quantum mechanics regards the flow of time as universal and absolute, whereas general relativity regards the flow of time as malleable and relative. This problem raises the question of what time really is in a physical sense and whether it is truly a real, distinct phenomenon. It also involves the related question of why time seems to flow in a single direction, despite the fact that no known physical laws at the microscopic level seem to require a single direction. For macroscopic systems the directionality of time is directly linked to first principles such as the second law of thermodynamics. (en)
- Nella fisica teorica, il problema del tempo è un conflitto concettuale tra relatività generale e meccanica quantistica in quanto la meccanica quantistica considera il flusso del tempo come universale e assoluto, mentre la relatività generale considera il flusso del tempo come malleabile e relativo. Questo problema solleva la questione di che cosa sia realmente il tempo in senso fisico e se sia veramente un fenomeno reale e distinto. Implica anche la relativa domanda sul perché il tempo sembra scorrere in un'unica direzione, nonostante il fatto che nessuna legge fisica nota a livello microscopico sembri richiedere un'unica direzione. Per i sistemi macroscopici la direzionalità del tempo è direttamente collegata a concetti primitivi come il secondo principio della termodinamica. (it)
- 理論物理學中，時間問題乃廣義相對論與量子力學間對於時間的概念衝突。量子力學中，時間的流動被視為絕對與同一的；廣義相對論中，時間的流動則是相對且受到環境的影響。此一問題涉及了物理學中，時間究竟為何？它是否是一真實存在、獨一的現象。另外時間似乎只有單方向的流動也是一個探討的主題，儘管目前不存在有一微觀的物理定律要求時間的單一流向。對巨觀系統來說，時間的流向則直接連結到一些第一原理，比如熱力學第二定律。 (zh)
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