--- Log opened Fri Dec 28 00:00:04 2018 01:02 -!- justanotheruser [~justanoth@unaffiliated/justanotheruser] has joined ##hplusroadmap 01:08 -!- Malvolio [~Malvolio@unaffiliated/malvolio] has quit [Quit: Ping timeout: 264 seconds] 01:15 -!- cluelessperson [~cluelessp@unaffiliated/cluelessperson] has joined ##hplusroadmap 01:52 -!- IRSSucks [uid290895@gateway/web/irccloud.com/x-rcqkfijxoyzpxhos] has quit [Quit: Connection closed for inactivity] 02:24 -!- ebowden [~ebowden@unaffiliated/ebowden] has quit [Remote host closed the connection] 02:33 -!- cerulean_syzygy [~cerulean_@5072B3C6.static.ziggozakelijk.nl] has quit [Ping timeout: 246 seconds] 03:07 -!- helleshin [~talinck@cpe-174-97-113-184.cinci.res.rr.com] has joined ##hplusroadmap 03:10 -!- TC [~talinck@cpe-174-97-113-184.cinci.res.rr.com] has quit [Ping timeout: 240 seconds] 03:17 -!- cerulean_syzygy [~cerulean_@client-145-120-39-78.surfnet.eduroam.rug.nl] has joined ##hplusroadmap 03:26 -!- aeiousomething [~aeiousome@unaffiliated/aeiousomething] has joined ##hplusroadmap 04:09 -!- aeiousomething [~aeiousome@unaffiliated/aeiousomething] has quit [Ping timeout: 250 seconds] 04:31 -!- aeiousomething [~aeiousome@unaffiliated/aeiousomething] has joined ##hplusroadmap 05:22 < nsh> re the PNAS article there's a very interesting and nontrivial relationship between outgoing and impinging radiation and it relates in a highly nontrivial way to orbital stability 05:24 < nsh> it might be possible to achieve a double result here and increase the radiative output of cities and other focal disruptions of microclimactic stability and at the same time decrease the thrust lift cost of satellite station-keeping reaction mass while increasing service lifetime of sats 05:24 -!- spaceangel [~spaceange@ip-86-49-16-65.net.upcbroadband.cz] has joined ##hplusroadmap 05:25 * adlai doubts humanity is yet at a level where radiated momentum destabilizes the spacetime climate 05:26 < nsh> no i mean hot cities not radiating their entropy away has an effect on local planetary microclimactics 05:26 < nsh> and other human sources of less-natural heat dynamics 05:27 < nsh> but if instead of just hoping heat dissipates we made it especially easy to couple and use by orbiting devices then we'd improve two things at once 05:29 < adlai> for starters, shouldn't exhaust be normal to the galactic plane? 05:29 < adlai> assuming that your city, planet, or solar system is parallel. 05:30 < nsh> i'm not sure 05:30 < nsh> the energy output from the earth's surface is ofc not very equidistributed 05:30 < nsh> how it gets shaped by stuff like solar wind i have no idea of 05:34 < nsh> but yeah i think strongly coupling on a satellite a gyroscopic system with large angular momentum to antennae via a time-reversal-symmetry-broken nonlinear eletronic system [ie one-way amplifiers] would result in interesting transduction 05:35 < nsh> based on results for metamaterials creased with lumped element circuit components as part of their bulk makeup 05:35 < nsh> which allows for nontrivial topological phases 05:36 < nsh> or a result idk if there are more 05:38 -!- aeiousom1thing [~aeiousome@unaffiliated/aeiousomething] has joined ##hplusroadmap 05:40 -!- aeiousomething [~aeiousome@unaffiliated/aeiousomething] has quit [Ping timeout: 246 seconds] 05:42 < nsh> - 05:42 < nsh> -- 05:42 < nsh> Therefore, realizing gyrotropic metamaterials requires exploiting the inherent unidirectional property in the underlying electronic circuits, which has so far remained largely unexplored. In this paper, we intentionally combine unidirectional lumped electronic circuit elements with small subwavelength antennas oriented to change the polarization states: We introduce a bulk gyrotropic metamaterial with large Faraday-like rotation in the absence of an 05:42 < nsh> external magnetic bias; highly nonreciprocal propagation is observed in both simulations and experiments, where up to 14.4 degrees of Faraday-like rotation occurs over a 0.1 wavelength-thick metamaterial layer. 05:42 < nsh> --- https://www.pnas.org/content/109/33/13194 05:43 < nsh> so you already achieve the topologically nontrivial edge states by virtual of a gyrotronic response 05:43 < nsh> (spin polarized photon circulate around the edge due to quantized transverse quantum hall bulk resonances/modes) 05:44 < nsh> or sorry more accurately electron spin currents circulate around the edge and this creates bosonic/photonic edge state 05:44 < nsh> it's not even accurate to say the electrons rotate around the boundary as the charge and spin currents can become decoupled 05:46 -!- RemoteFox [~RemoteFox@85.255.9.122] has joined ##hplusroadmap 05:46 < RemoteFox> ola 05:46 < nsh> o/ 05:47 < nsh> if you have non-reciprocal spin-orbit coupling in a metamaterial which allows for large amounts of gyroscopic angular momentum then you can station keep without thrust 05:49 < nsh> but i have no idea how much movement you can achieve for how much energy to establish the coupling, and what requirements there'd be on the impinging radiation to get a decent couple action from it 05:50 < nsh> and also to show this is possible - ie doesn't violate conservation of linear and angular momentum in the appropriately bracketed/boundaried nonlocal system - is not incredibly obvious 06:05 < adlai> .title 06:05 < yoleaux> Gyrotropic response in the absence of a bias field | PNAS 06:10 -!- bsm117532 [~mcelrath@c-24-61-184-150.hsd1.ma.comcast.net] has joined ##hplusroadmap 06:31 -!- Malvolio 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