Recent content by Tom D

it is the scale at which all the forces of nature are unified

I reckon so. In fact, in principle it would be possible to find the exact dimensions of the 'envelope' which contains the spatial extent of a single photon thus: consider a light source in an otherwise 'light-tight' box with a tiny hole which emits one photon at a time through the hole...

"Science means to study the world and to understand who we are and what is our position in this world. It does NOT mean to create technologies so we can enjoy..." ...the convenience of computers and telecoms which facilitated this post ?

I wonder if Professor Hawking is confusing mathematical models with reality? I think that maybe perhaps he is. Also, what happened to 'knowing the mind of God' , as promised in Brief History of Time ? Will Professor Hawking announce next year that we can't really know the mind of God after all ?

To be fair, I haven't used the HP, but I can certainly recommend the TI-89.I have used the TI Voyage200, which is essentially a TI-89 with a full QWERTY alphanumerical keypad rather than an ABCDEF keypad, for over a year now, and the more I use it, the more I think it's amazingly most excellent...

Yes but Feynman still theory not established knowledge. The two-slitter has been done numerous times with electrons,photons and buckyballs ( buckminstertoluene ), which are roughly the diameter of their wavelength. It seems that anything bigger ( in physical reality ) than it's wavelengh can...

Now that's very interesting idea.

yes, that's true-- there is that point.However, I 13.7 G yr for little-u not big-u is probably about right, and I still feel uncomfortable to think of infinity being other than a concept. Example: people have been known to say, ' oh the density of a singularity of a black whole is infinite and...

This is a most excellent welcome back ! Thank you.( I have been too busy to surf recently ).

Why the 'of course' ? Not everyone knows the same things as everyone else. What is 'of course' to you today was news to you at some point in the past ( unless, of course, you have known that since birth ).

Our universe is seemingly 13.7 billion years old, so not of infinite age. Nobody knows whether our universe is the Universe or just a universe i.e. whether the observed universe is one of many 'bubble' universes which are each part of the Universe but totally inaccesible to one another,or if...

"...geometric interpretation..." "...What does this now mean? Does gravity have two independent causes, which act in parallel?..." [?] What if... Well, I see it like this.if space is dynamic as implied by the apparent expansion of universe where space stretches outwardly from all points and...

Hi,Zare. ZPE features in this week's New Scientist and is (apparently) seemingly non-zero. According to the article, ZPE=cosmological constant and dictates the rate of cosmic expansion. It is all very interesting, nonetheless. What if...[?]what if ZPE dictates gravity as well as cosmic...

I understand that there are three 'types' of redshift: (1.) Doppler redshift (-ve blueshift) caused by relative motion through space (2.) Cosmic expansion redshift caused by the expansion of space. (3.) Gravitational redshift caused by, er, gravitation, although some people ( that is, at...

Yes, it does say 20 billion although I haven't yet checked it all out