query: Photons in expanding space: how is energy conserved?
positive_passages.docid: 107971
positive_passages.text: Hubble's law and conservation of energy
negative_passages.docid: 91300
negative_passages.text: Does light loses its energy when it passes through denser medium?
negative_passages.docid: 3108
negative_passages.text: Why does space expansion not expand matter?
negative_passages.docid: 58042
negative_passages.text: Redshifting of Light and the expansion of the universe
negative_passages.docid: 22931
negative_passages.text: Does a charged particle accelerating in a gravitational field radiate?
negative_passages.docid: 41041
negative_passages.text: Does a photon instantaneously gain $c$ speed when emitted from an electron?
negative_passages.docid: 58463
negative_passages.text: How are photons "consumed"?
negative_passages.docid: 42372
negative_passages.text: Space Expansion vs. Relative Motion
negative_passages.docid: 100599
negative_passages.text: What is the trajectory of a photon moving through a vacuum?
negative_passages.docid: 85582
negative_passages.text: Why aren't all photons virtual particles even in the "vacuum" of empty space?
negative_passages.docid: 64508
negative_passages.text: Where exactly does energy quantisation come in for light?
negative_passages.docid: 2191
negative_passages.text: Is there a maximum amount of photons that can exist in a certain amount of space?
negative_passages.docid: 69709
negative_passages.text: How can a photon oscillate when it experiences no time?
negative_passages.docid: 148218
negative_passages.text: How precise must the energies match for absorption of photons?
negative_passages.docid: 2073
negative_passages.text: Conservation law of energy and Big Bang?
negative_passages.docid: 149674
negative_passages.text: Kinetic energy of a photon and Schwarzschild radius
negative_passages.docid: 57961
negative_passages.text: Some doubts about photons