A worth reading book review by Sheri Berman on” Political order and Political Decay “ by Francis Yukuyama.
“ Yet if the United States illustrates how democratic states can develop, it also illustrates how they can decline. Drawing on Huntington again, Fukuyama reminds us that “all political systems — past and present — are liable to decay,” as older institutional structures fail to evolve to meet the needs of a changing world. “The fact that a system once was a successful and stable liberal democracy does not mean that it will remain so in perpetuity,” and he warns that even the United States has no permanent immunity from institutional decline.
Over the past few decades, American political development has gone into reverse, Fukuyama says, as its state has become weaker, less efficient and more corrupt. One cause is growing economic inequality and concentration of wealth, which has allowed elites to purchase immense political power and manipulate the system to further their own interests. Another cause is the permeability of American political institutions to interest groups, allowing an array of factions that “are collectively unrepresentative of the public as a whole” to exercise disproportionate influence on government. The result is a vicious cycle in which the American state deals poorly with major challenges, which reinforces the public’s distrust of the state, which leads to the state’s being starved of resources and authority, which leads to even poorer performance.”
Posted By F. Sheikh
What would happen to you if you went back in time and killed your grandfather? A model using photons reveals that quantum mechanics can solve the quandary—and even foil quantum cryptography
Recently Ralph and his PhD student Martin Ringbauer led a team that experimentally simulated Deutsch’s model of CTCs( Closed Time like Curve) for the very first time, testing and confirming many aspects of the two-decades-old theory. Their findings are published in Nature Communications. Much of their simulation revolved around investigating how Deutsch’s model deals with the “grandfather paradox,” a hypothetical scenario in which someone uses a CTC to travel back through time to murder her own grandfather, thus preventing her own later birth. (Scientific American is part of Nature Publishing Group.)
Deutsch’s quantum solution to the grandfather paradox works something like this:
Instead of a human being traversing a CTC to kill her ancestor, imagine that a fundamental particle goes back in time to flip a switch on the particle-generating machine that created it. If the particle flips the switch, the machine emits a particle—the particle—back into the CTC; if the switch isn’t flipped, the machine emits nothing. In this scenario there is no a priori deterministic certainty to the particle’s emission, only a distribution of probabilities. Deutsch’s insight was to postulate self-consistency in the quantum realm, to insist that any particle entering one end of a CTC must emerge at the other end with identical properties. Therefore, a particle emitted by the machine with a probability of one half would enter the CTC and come out the other end to flip the switch with a probability of one half, imbuing itself at birth with a probability of one half of going back to flip the switch. If the particle were a person, she would be born with a one-half probability of killing her grandfather, giving her grandfather a one-half probability of escaping death at her hands—good enough in probabilistic terms to close the causative loop and escape the paradox. Strange though it may be, this solution is in keeping with the known laws of quantum mechanics.
Posted By F. Sheikh