GENERAL RELATIVITY Time Dilation & Light Bending 1.
GENERAL RELATIVITY Time Dilation & Light Bending 1. Time Dilation 2. Light Bending 3. Black Holes Acceleration causes time dilation: consider increments of travelling twins journey Elapsed time t, distance travelled l, measured in inertial (rest) frame of stay-at-home twin Proper time elapsed on travelling twins clock
= t - l valid for SR (IRF) is less than t (time dilation) Equivalence principle implies gravity dilates time Gravity Ticks slower
weaker stronger E.g. One mile high = 15 billionths sec / day faster Important for GPS Hafele & Keating 1971 Atomic clocks on airline Ticks faster
Light Equivalence principle implies bending of light by gravity Gravitational Lensing First seen by Eddingtons 1919 eclipse expedition Black Holes Sufficiently strong gravity could create an Event Horizon Time stands still at EH relative to far away clocks
Nothing can escape once past the EH Stellar collapse, galaxy centers, may produce Black Holes Milky Way Center in X-rays Cygnus X-1 orbiting a black hole
Cyber threats represent a new, and perhaps more deadly set of weapons of mass destruction "Hyperwar" U.S. Naval Institute's Proceedings Magazine - the use of artificial intelligence in cyber warfare that requires near instantaneous responses. FBI's national announcement of a...
ES Software Stack - Development Tools - the ELK stack. E. lasticSearch - Core indexing and Searching API. Should be thought of as a . database . with querying and searching capabilities inherited from Lucene - the word
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Support and partnerships systematically provide schools, teachers, and students with supports at increasing levels of intensity based on the responsiveness to invention and instruction. The three tiers include 1-prevention, 2-intervention, and 3-one to one support. Integrated and Equitable Multi-Tiered Systems...
Protocol. Uses a proprietary Internet telephony Voice over Internet Protocol (VoIP) network called the Skype protocol which is based on peer-to-peer architecture, used by Skype only. Audio Codec. Uses an array of different audio compression methods including . G.729. and...
Being a migrant: Boota Singh, aged 87 years, cares for his wife 'I worked there [in Singapore] for five years. I got a job as head cook... people worked underneath me [4s pause]. Because of that we are still alive.
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