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Bookmark or Share- optics - In a uniaxial crystal, what determines the optical axis ...In a uniaxial crystal there is an optic axis, an extraordinary axis, and an ordinary axis. The optic axis is not the direction in which we plan to propagate light. The light is propagating in a direction such that the electric field might oscillate parallel to the optic axis. I have included a hand-drawn diagram below.
- How to find the axis with minimum moment of inertia?This is actually a nice example of tensors and minimization using Lagrange multipliers. For rotation about the COM, the inertia tensor $\mathbf{I}$ is defined as a symmetric $3\times3$ matrix with elements such as $$ I_{xx} = \sum_k m_k (y_k^2+z_k^2), \quad I_{xy} = I_{yx} = -\sum_k m_k x_k y_k, \quad I_{xz} = I_{zx} = -\sum_k m_k x_k z_k, \quad \ldots $$ where the position vectors $(x_k,y_k,z ...
- Difference between timelike and spacelike vectorsIn that sense, the timelike vector can be considered to define a four-velocity direction of an observer and thus the time axis of that observer (to be a four-velocity it should be normalised). On the other hand a spacelike vector can be considered as defining a space axis (a spatial direction) of an observer.
- What is the scientific reason for the inclination of earth's rotation axis?This titled position of the earths axis is known as inclination of the earths axis. The earth's rotation axis makes an angle of about 66.5 degrees with the plane of its orbit around the sun, or about 23.5 degrees from the perpendicular to the ecliptic plane. what is the scientific reason for the inclination of earth's rotation axis?
- What is the cosmic "Axis of Evil" problem? - Physics Stack ExchangeWhat is the cosmic "axis of evil" problem? Apparently it is a more modern version of the old cluster mass discrepancy problem, where masses determined by gravitational lensing are always higher than masses determined by X-ray observations. Now Sunyaev-Zeldovich (SZ) masses from Planck seem to make the problem worse. Do the SZ masses disagree ...
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