Recent content by avery

If the positive energy is the capacity to perform work what about the negative energy?

thank you Nabeshin if P is momentum of a particle that already exist how can this equation explain the create of virtual particle from nothing?

I am trying to understand the following equation: what is P?

thx Khashishi does the pahse-space of the early state of the universe has any effect? I don't understand what p.roger he is trying to say here: http://books.google.ca/books?id=oI0grArWHUMC&pg=PA445&lpg=PA445

hi, what is the total entropy of the universe today? thank you

is our universe the unique possible outcome of the big bang regardless of the original state? if not, what are the factors that may change the universe as we know it today? what they mean by (WEYL = 0) as the big bang ?

thank you Bill_K for the clarification.

Roger Penrose said: what he meant by that ? thank you.

thank you mathman

hi my question is simple: is there empty space with null energy? thx.

hi tiny-tim well I guess they take that in consideration when they measure the distance between the mirror on the moon and their location on earth.

hi I head that the laser moon mirror experiment showed that the following equation is not so accurate. is there in general relativity a precise equation that links the mass of the moon and the mass of the Earth and the force and the distance between them ? thx

hi elfmotat is this transformation needed in "Riemann curvature tensor" ?

thank you Mentz114 for your help

hi I understand that Snell's law describe the relationship between the angles of incidence and refraction, when referring to light passing different isotropic media. someone told me that Snell's law describe also the curvature of space time in General Relativity? is that true? if not what are...