Recent content by I_wonder

Do cosmologists know what is the current value of the scale factor? I know we have a current value for the Hubble constant H, and I know H=a'/a. But what about the value of a? Thanks!

Does anyone know, when an electron in an atom is exited by absorbing a photon, how long does it take for the electron to absorb the entire energy of the photon? Does the time scale depend on the energy level? Thanks!

Pls Ignore my question, it was based on some misunderstanding.

In GR, what is the energy of a system of two identical bodies rotating around their center of mass with regular angular frequency? (assuming such a system is possible). Please take into consideration that I don't know GR at all. Thanks.

At the risk of appearing somewhat obsessed, I'll ask something similar to another thread I'd opened previously: Has anyone ever come across any experiments suggesting that the E=hw law for the energy of photons may require some correction, say, at a specific wavelength range?

Has anyone ever come across any experiments suggesting that the E=hw law for the energy of photons may require some correction, especially in the case of low energy photons ?

Thanks to everyone! I_wonder...

Could anyone please help with the following, rather unusual, query? I know that for spin 0 bosons, the Klein Gordon equation gives solutions that are similar to the solutions of the Schrödinger equation for a non-relativistic free particle, the only difference being that the energy used when...