Undergrad Is a Photon Considered a Real Object?

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The discussion centers on whether a photon qualifies as a real object, with participants noting that a gamma photon can produce electron-positron pairs, suggesting its reality. However, a key point raised is the contradiction in considering a photon a real object if it lacks an inertial frame where its velocity would equal zero. This leads to questions about the definition of a real object and whether it necessitates having an inertial frame. The conversation highlights the complexities of defining reality in the context of physics. Ultimately, the nature of photons challenges traditional concepts of real objects in physics.
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Photon is real object, a gamma photon can create a pair electron and positron. But if photon is a reality object then why itself is not a inertial frame so in this frame its velocity is equal 0?
 
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fxdung said:
Photon is real object
What is the definition of a real object?

fxdung said:
But if photon is a reality object then why itself is not a inertial frame so in this frame its velocity is equal 0?
Can you derive from the definition of a real object that they must have an inertial frame? If not, then this question doesn’t make sense.
 
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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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