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decelera
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There are 8 letters in DECELERA ( A1C3D2E1L1R1 )
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Definitions of decelera in various dictionaries:
DECELERA - The deceleration parameter q {\displaystyle q} in cosmology is a dimensionless measure of the cosmic accel...
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The Deceleration parameter * * * * q * * * {\displaystyle q} * in cosmology is a dimensionless measure of the cosmic acceleration of the expansion of space in a Friedmann–Lemaître–Robertson–Walker universe. It is defined by:* * * * q * * * * * * = * * * * d * e * f * * * * * * * − * * * * * * * a * ¨ * * * * a * * * * * * a * ˙ * * * * * 2 * * * * * * * {\displaystyle q\ {\stackrel {\mathrm {def} }{=}}\ -{\frac {{\ddot {a}}a}{{\dot {a}}^{2}}}} * where * * * * a * * * {\displaystyle a} * is the scale factor of the universe and the dots indicate derivatives by proper time. The expansion of the universe is said to be "accelerating" if * * * * * * * a * ¨ * * * * > * 0 * * * {\displaystyle {\ddot {a}}>0} * (recent measurements suggest it is), and in this case the deceleration parameter will be negative. The minus sign and name "deceleration parameter" are historical; at the time of definition * * * * * * * a * ¨ * * * * * * {\displaystyle {\ddot {a}}} * was expected to be negative, so a minus sign was inserted in the definition to make * * * * q * * * {\displaystyle q} * positive in that case. Since the evidence for the accelerating universe in the 1998–2003 era, it is now believed that * * * * * * * a * ¨ * * * * * * {\displaystyle {\ddot {a}}} * is positive therefore the present-day value * * * * * q * * 0 * * * * * {\displaystyle q_{0}} * is negative (though * * * * q * * * {\displaystyle q} * was positive in the past before dark energy became dominant). In general * * * * q * * * {\displaystyle q} * varies with cosmic time, except in a few special cosmological models; the present-day value is denoted * * * * * q * * 0 * * * * * {\displaystyle q_{0}} * . * The Friedmann acceleration equation can be written as * * * * * ... |