منابع مشابه
Measuring the speed of sound of quintessence.
Quintessence, a time-varying energy component that may account for the accelerated expansion of the universe, can be characterized by its equation of state and sound speed. In this paper, we show that if the quintessence density is at least 1% of the critical density at the surface of last scattering the cosmic microwave background anisotropy can distinguish between models whose sound speed is ...
متن کاملLaplace and the Speed of Sound
OR A CENTURY and a quarter after Isaac Newton initially posed the problem in the Principia, there was a very apparent discrepancy of almost 20 per cent between theoretical and experimental values of the speed of sound. To remedy such an intolerable situation, some, like Newton, optimistically framed additional hypotheses to make up the difference; others, like J. L. Lagrange, pessimistically co...
متن کاملSound affects the speed of visual processing.
The authors examined the effects of a task-irrelevant sound on visual processing. Participants were presented with revolving clocks at or around central fixation and reported the hand position of a target clock at the time an exogenous cue (1 clock turning red) or an endogenous cue (a line pointing toward 1 of the clocks) was presented. A spatially irrelevant sound presented 100 ms before the c...
متن کاملCausality and the speed of sound
A usual causal requirement on a viable theory of matter is that the speed of sound be at most the speed of light. In view of various recent papers querying this limit, the question is revisited here. We point to various issues confronting theories that violate the usual constraint.
متن کاملThe Speed of Sound in Hadronic Matter
We calculate the speed of sound cs in an ideal gas of resonances, whose mass spectrum is assumed to have the Hagedorn form ρ(m) ∼ m exp{bm}, which leads to singular behavior at the critical temperature Tc = 1/b. With a = 4 the pressure and the energy density remain finite at Tc, while the specific heat diverges there. As a function of the temperature, the corresponding speed of sound initially ...
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ژورنال
عنوان ژورنال: Breast Cancer
سال: 2020
ISSN: 1340-6868,1880-4233
DOI: 10.1007/s12282-020-01127-7