A similar example is [[time]] and [[energy]], the product of which also has a lower limit. Quantum fluctuations are a result of this, where for short time, there is enough energy in "empty space" to create a pair of particle and antiparticle, such as electron and positron. Although this appears to be a strange or extreme process, it is the only one to explain some properties of black holes. Laser physics with ultrashort [[laser]] pulses is another field, where the limit in the product of time and energy plays an important role. | A similar example is [[time]] and [[energy]], the product of which also has a lower limit. Quantum fluctuations are a result of this, where for short time, there is enough energy in "empty space" to create a pair of particle and antiparticle, such as electron and positron. Although this appears to be a strange or extreme process, it is the only one to explain some properties of black holes. Laser physics with ultrashort [[laser]] pulses is another field, where the limit in the product of time and energy plays an important role. |