Calculating Vacuum Fields at Different Frequencies

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Calculating vacuum fields at different frequencies involves understanding the noise present in a system. It has been determined that approximately 1nW of power can be obtained for various frequencies, which, while small, can be beneficial in specific applications. This information can assist others seeking similar solutions in their research or projects. The significance of vacuum fields lies in their utility despite their minimal power output. Overall, this discussion highlights the relevance of vacuum fields in practical scenarios.
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How can we calculate the vacuum fields corresponding to certain frequencies?
 
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From some reference I got following information.


Vacuum fields are noises in a system. And the by some calculations, we get roughly
1nW of power for different frequencies. Although, it is really small but very useful in some cases.

May be it helps some one looking for similar solution.
 

Thread 'Two equivalent statements of time reversal symmetric Hamiltonian'

Time reversal invariant Hamiltonians must satisfy ##[H,\Theta]=0## where ##\Theta## is time reversal operator. However, in some texts (for example see Many-body Quantum Theory in Condensed Matter Physics an introduction, HENRIK BRUUS and KARSTEN FLENSBERG, Corrected version: 14 January 2016, section 7.1.4) the time reversal invariant condition is introduced as ##H=H^*##. How these two conditions are identical?
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