100:00:21,840 --> 00:00:28,410yeah 200:00:51,840 --> 00:00:54,840yeah 300:01:18,750 --> 00:01:25,140yeah 400:01:25,920 --> 00:01:31,80ladies and gentlemen it's my privilegeto introduce the messenger lecture as 500:01:31,80 --> 00:01:37,470Richard be fine men of the Califo iaInstitute of Technology p...

“It is odd, but on the infrequent occasions when I have been called upon in a formal place to play the bongo drums, the introducer never seems to find it necessary to mention that I also do theoretical physics. I believe that is probably because we respect the arts more than the sciences. The artist...

100:00:21,840 --> 00:00:28,410yeah 200:00:51,840 --> 00:00:54,840yeah 300:01:18,750 --> 00:01:25,140yeah 400:01:25,920 --> 00:01:31,80ladies and gentlemen it's my privilegeto introduce the messenger lecture as 500:01:31,80 --> 00:01:37,470Richard be fine men of the Califo iaInstitute of Technology p...

Extra-dimensions are a common topic in popular descriptions of theoretical physics with whichundergraduate student most often have no contact in physics courses. This paper shows how studentscould be introduced to this topic by presenting an approach to two basic consequences of thepresence of compa...

Aims. Daily observation conditions are needed when observing the Sun at high angular resolution. MISOLFA is a daytime seeingmonitor developed for this purpose that allows the estimation of the spatial and temporal parameters of atmospheric turbulence. Thisinformation is necessary, for instance, for ...

The double-slit experiment is used as thearchetypal interference experiment to dramat-ically demonstrate the quantum weirdness ofwave-particle duality. It is a long-held assump-tion that whether which-way detectors are placedat one slit or both will yield the same results, ren-dering the second dete...

The motion of material bodies formed the subject of some of the earliest researchpursued by the pioneers of physics. From their efforts there has evolved a vastfield known as analytical mechanics or dynamics, or simply, mechanics. In thepresent century the term "classical mechanics" has come into wi...

The co erstone of mode cosmology is the belief that the place that we occupy in theUniverse is in no way special. This is known as the cosmological principle, and it is anidea which is both powerful and simple. It is intriguing, then, that for the bulk of the historyof civilization it was believed t...

For most of history, astronomers have had to rely on light in the visible part of the spec-trum in order to study the Universe. One of the great astronomical achievements of the20th century was the exploitation of the full electromagnetic spectrum for astronomicalmeasurements. We now have instrument...

It is perfectly possible to discuss cosmology without having already lea ed general rel-ativity. In fact, the most crucial equation, the Friedma equation which describes theexpansion of the Universe, tu s out to be the same when derived from Newton’s theoryof gravity as it is when derived from the e...

We now consider the real meaning of the constant k which appears in the Friedma equationa ̇a2=8πGkρ − 2 .3a(4.1)While the Newtonian derivation in the last chapter introduced this as a measure of theenergy per particle, the true interpretation, apparent in the context of general relativity, isthat it...

In Chapter 3 we derived the equations satisfied by an expanding isotropic gas. They are theFriedman equation 1a ̇a2=8πGkρ − 2 ,3a(5.1)which gove s the time evolution of the scale factor a(t), and the fluid equationρ ̇ + 3a ̇pρ + 2ac= 0 ,(5.2)which gives us the evolution of the mass density ρ(t). I s...

The Big Bang model does not give a unique description of our present Universe, but ratherleaves quantities such as the present expansion rate, or the present composition of the Uni-verse, to be fixed by observation.It is a standard practice to specify cosmological models via a few parameters, which ...