Cosmology

Download After the First Three Minutes: The Story of Our Universe by T. Padmanabhan PDF

By T. Padmanabhan

The evolution of our Universe and the formation of stars and galaxies are mysteries that experience lengthy questioned scientists. fresh years have introduced new clinical knowing of those profound and basic matters. In energetic prose, Professor Padmanabhan paints an image of up to date cosmology for the final reader. not like different well known books on cosmology, After the 1st 3 mins doesn't gloss over info, or turn away from explaining the underlying suggestions. as an alternative, with a lucid and casual type, the writer introduces the entire proper historical past after which conscientiously items jointly an interesting tale of the evolution of our Universe. Padmanabhan leaves the reader with a cutting-edge photo of scientists' present figuring out in cosmology and a willing style of the buzz of this fast-moving technological know-how. all through, no arithmetic is used and all technical jargon is obviously brought and bolstered in a convenient word list on the finish of the ebook. For normal readers who are looking to come to grips with what we actually do and do not find out about our Universe, this publication offers a thrilling and uncompromising learn. Thanu Padmanabhan is a Professor at Inter-University Centre for Astronomy and Astrophysics in Pune, India. he's the recipient of various awards and writer of 3 books, constitution Formation within the Universe (Cambridge, 1994), Cosmology and Astrophysics via difficulties (Cambridge, 1996), and, including J.V. Narlikar, Gravity, Gauge Theories and Quantum Cosmology. he's additionally the writer of a couple of hundred well known technology articles, a comic book strip serial and several other commonplace columns on astronomy, leisure arithmetic, and the heritage of technology.

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Additional info for After the First Three Minutes: The Story of Our Universe

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6 eV on a hydrogen atom, then the electron can absorb one such photon and reach the zero energy level. This means that the electron has just become free. 13 When photons of different wavelengths pass through a hydrogen atom, only those with specific wavelength will get absorbed. This is because only photons with certain wavelengths will have energies corresponding to the energy difference between the levels of the hydrogen atom. In the figure the photon marked 1 has been absorbed by an electron which makes a transition to a higher level.

Just like electric forces, magnetic forces have also been known to humanity for centuries. What was not known to ancient civilizations was that electric and magnetic forces are essentially the same. 2 Forces of nature electric charges and is not a separate kind of force caused by some new kind of 'magnetic charge'. The moving charges constitute what is usually called an electric current, and it is this electric current which produces the magnetic field. Thus one should view the electromagnetic force as a single entity.

We assume that the first electron emits a particle (in this case, called a photon) which is absorbed by the second electron. It is this transfer of a photon which actually produces the electrical repulsion between the two particles. In fact, the simplest of the vector bosons is a photon, which is the quanta of electromagnetic radiation. 7 According to quantum theory, all forces of interaction are caused by the exchange of certain particles called vector bosons. For example, the electromagnetic force between two charged particles, say electrons, is caused by the exchange of a particle called the photon, which is the simplest of the vector bosons.

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