http://livasperiklis.com Periklis D. Livas | Περικλής Δημ. Λιβάς Sat, 25 May 2013 21:16:18 +0000 el hourly 1 http://wordpress.com/ http://1.gravatar.com/blavatar/1faca073dec6a22c8e3f082d7aef95b2?s=96&d=http%3A%2F%2Fs2.wp.com%2Fi%2Fbuttonw-com.png http://livasperiklis.com http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-42y/ http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-42y/#comments Sat, 25 May 2013 20:35:46 +0000 Λιβάς Δημ. Περικλής http://livasperiklis.com/?p=15534 ]]> http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-42y/feed/ 3 37.975336 23.736150 37.975336 23.736150 Multiverse_web livasperiklis Is the universe natural or do we live in an atypical bubble in a multiverse? Recent results at the Large Hadron Collider have forced many physicists to confront the latter possibility. (Illustration: Giovanni Villadoro) logo_simons In the multiverse scenario a vast and diverse array of bubble universes fluctuate into existence inside a larger vacuum. A small fraction of the universes have physical properties conducive to life. ResearchBlogging.org einsteinquotesimple IMPORTANT NOTICE Share http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-42q/ http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-42q/#comments Sat, 25 May 2013 19:42:56 +0000 Λιβάς Δημ. Περικλής http://livasperiklis.com/?p=15526 ]]> http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-42q/feed/ 1 37.975336 23.736150 37.975336 23.736150 250px-David_Gross_LANL livasperiklis Gross shared the 2004 Nobel Prize in Physics with H. David Politzer and Frank Wilczek for discovering asymptotic freedom. (Photo: Volker Steger) logo_simons ResearchBlogging.org einsteinquotesimple IMPORTANT NOTICE Share http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-42f/ http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-42f/#comments Sat, 25 May 2013 18:09:53 +0000 Λιβάς Δημ. Περικλής http://livasperiklis.com/?p=15515 ]]> http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-42f/feed/ 1 37.975336 23.736150 37.975336 23.736150 space1 livasperiklis The effect of the extragalactic background radiation on the propagation of gamma rays from active galaxies. UCRiverside cta-logo ResearchBlogging.org einsteinquotesimple IMPORTANT NOTICE Share http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-41f/ http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-41f/#comments Sat, 25 May 2013 11:26:56 +0000 Λιβάς Δημ. Περικλής http://livasperiklis.com/?p=15479 ]]> http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-41f/feed/ 1 37.975336 23.736150 37.975336 23.736150 sscyg livasperiklis Artist's Conception of SS Cygni double-star system. "Normal" red-dwarf star, left, has material pulled from it onto swirling disk surrounding compact white-dwarf star, right. Outbursts occur when the disk becomes unstable. Credit: Bill Saxton, NRAO/AUI/NSF NRAO_logo nsf Trigonometric Parallax method determines distance to star by measuring its slight shift in apparent position as seen from opposite ends of Earth's orbit. CREDIT: Bill Saxton, NRAO/AUI/NSF ICRAR Schematic diagram of the white dwarf binary system SS Cygni. The two stars are close enough to one another that gas falls in from the companion star and swirls around the white dwarf in an accretion disc. The disc gets very hot, producing radiation that illuminates the surface of the companion star and heats it up. Gas from the inner part of the disc is accelerated outwards in fast-moving, oppositely-directed jets, which produce the radio waves that the astronomers used to study the star system and measure its distance from Earth. Image credit: J. Miller-Jones (ICRAR), using software created by R. Hynes. Curtin-University-Logo-570x195 News-science_aaas_logo_0 NavLogo AAVSOLogo ResearchBlogging.org einsteinquotesimple IMPORTANT NOTICE Share http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-41j/ http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-41j/#comments Sat, 25 May 2013 08:56:15 +0000 Λιβάς Δημ. Περικλής http://livasperiklis.com/?p=15483 ]]> http://livasperiklis.com/2013/05/25/httpwp-mep29tmj-41j/feed/ 1 37.975336 23.736150 37.975336 23.736150 PW-2013-05-23-hydrogen-wavefunction1 livasperiklis PW-2013-05-23-hydrogen-wavefunction1 iop-science physicsworld Evidence for on-resonance ionization by tunnelling through the Coulomb field potential. Comparison is given between a measurement taken for one resonant and two non-resonant nodes. Images (A) and (C) were taken after non-resonant ionization, while for the central image, (B), the laser was tuned to a resonance with two nodes in the wavefunction. (Courtesy: Stodolna et al. Phys. Rev. Lett.) maxborninst eb-logo-header Experimental observation of the transverse nodal structure of four atomic hydrogen Stark states. The images in the middle show experimental measurements. Interference patterns are clearly observed where the number of nodes corresponds to the value of n1. The results may be compared to time-dependent Schrödinger equation calculations shown to the left, revealing that the experimentally observed nodal structures originate from the transverse nodal structure of the initial state that is formed upon laser excitation. A comparison of the experimentally measured (solid lines) and calculated radial (dashed lines) probability distributions is shown to the right of the experimental results. (Courtesy: Stodolna et al. Phys. Rev. Lett.) ResearchBlogging.org einsteinquotesimple IMPORTANT NOTICE Share