Download An Invitation to Astrophysics (World Scientific Series in by Thanu Padmanabhan PDF

By Thanu Padmanabhan

This exact e-book presents a transparent and lucid description of numerous elements of astrophysics and cosmology in a language comprehensible to a physicist or newbie in astrophysics. It provides the main subject matters in all branches of astrophysics and cosmology in an easy and concise language. The emphasis is on presently lively examine parts and fascinating new frontiers instead of on extra pedantic themes. Many advanced effects are brought with easy, novel derivations which improve the conceptual knowing of the topic. The e-book additionally includes over 100 workouts to be able to aid scholars of their self research. Undergraduate and graduate scholars in physics and astrophysics in addition to all physicists who're attracted to acquiring a brief seize of astrophysical options will locate this ebook valuable.

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Extra resources for An Invitation to Astrophysics (World Scientific Series in Astronomy and Astrophysic)

Example text

To obtain this result, we need to recall some basic facts from rotational dynamics. In an inertial frame, the angular momentum of the body changes in accordance with the law (dJ/dt) = K where K is the external torque. The time derivative of any vector A in the inertial and rotating frames differ by the term ft x A. This is most easily seen by noting that if the vector A does not change in the moving frame, then its rate of change in the fixed frame is only due to rotation and we must have <5A = 56 x A = (ft x A)dt.

Assuming that light always travels with the speed c in proper coordinates we have dl/dr — c and taking v = (dr/dt), one gets the effective refractive index to be n = c/v ~ (1 — 20/c 2 ). This can be interpreted as the effective refractive index of a spacetime with the gravitational potential cf>. When this is used in Eq. 83) to the lowest order in (j)/c2, we have the equation of motion for the light ray to be d2xa nd , Thus the net force acting on a light beam in a gravitational field is twice the Newtonian force.

Let us estimate the time scale for this effect. Consider a gravitational encounter between two bodies in an N-body system (say, a cluster of stars) each of mass m and relative velocity v. If the impact parameter is 6, then the typical transverse velocity induced by the encounter is Sv_i ~ (Gm/b2) (26/'v) = (2Gm/bv). The deflection of the stars can be significant if (6v±/v) > 1, which occurs for collisions with impact parameter b < bc ~ (Gm/v2). Thus the effective cross section for collision with significant change of momentum is a ~ b2c ~ (G2m2/v4).

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