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  • April 3, 2017
  • 09:00 AM
  • 273 views

"Science is Under Attack." A Climate Scientist's Call to Action for the Future of our Planet.

by EE Giorgi in CHIMERAS

It’s a foggy morning in London. Meteorologist George Simpson, the director of the British Meteorological Office, sips his tea and opens a paper authored by a scientist named Guy Stewart Callendar. The last sentence of the abstract reads, “The temperature observations at 200 meteorological stations are used to show that world temperatures have actually increased at an average rate of 0.005°C per year during the past half century.”Simpson shakes his head and thinks, “Nonsense. It’s all ........ Read more »

  • April 7, 2015
  • 08:00 AM
  • 1,745 views

Star Trek Shields For Tanks

by Mark E. Lasbury in The 'Scope

Star Trek deflectors absorbed or deflected energy beams, but would they work against bullets or asteroids? Scientists are on working on armors and plasma systems that can stop projectiles. In some cases we use explosions to stop explosions. In others, tanks are turned into electrical pulse generators that zap incoming rockets. But the most amazing is the wall of exploding plasma that will be the first true defensive energy shield.... Read more »

Mayseless, M. (2011) Effectiveness of Explosive Reactive Armor. Journal of Applied Mechanics, 78(5), 51006. DOI: 10.1115/1.4004398  

Yoo, Y., Zheng, H., Kim, Y., Rhee, J., Kang, J., Kim, K., Cheong, H., Kim, Y., & Lee, Y. (2014) Flexible and elastic metamaterial absorber for low frequency, based on small-size unit cell. Applied Physics Letters, 105(4), 41902. DOI: 10.1063/1.4885095  

  • March 10, 2015
  • 07:00 AM
  • 1,605 views

Pulling Us Toward Tractor Beams

by Mark E. Lasbury in The 'Scope

Tractor beams pulling space ships are things of science fiction, but tractor beams pulling small objects on Earth are science fact. Beams usually push things away with their force, but we have learned to manipulate them so that they push things back to the source – we can do it with water, sound and even laser light.... Read more »

Shvedov, V., Davoyan, A., Hnatovsky, C., Engheta, N., & Krolikowski, W. (2014) A long-range polarization-controlled optical tractor beam. Nature Photonics, 8(11), 846-850. DOI: 10.1038/nphoton.2014.242  

Mo Li, W. H. P. Pernice, & H. X. Tang. (2009) Tunable bipolar optical interactions between guided lightwaves. Nature Photonics. arXiv: 0903.5117v1

Démoré CE, Dahl PM, Yang Z, Glynne-Jones P, Melzer A, Cochran S, MacDonald MP, & Spalding GC. (2014) Acoustic tractor beam. Physical review letters, 112(17), 174302. PMID: 24836252  

Punzmann, H., Francois, N., Xia, H., Falkovich, G., & Shats, M. (2014) Generation and reversal of surface flows by propagating waves. Nature Physics, 10(9), 658-663. DOI: 10.1038/nphys3041  

Ruffner DB, & Grier DG. (2012) Optical conveyors: a class of active tractor beams. Physical review letters, 109(16), 163903. PMID: 23215079  

  • February 10, 2015
  • 07:00 AM
  • 1,820 views

Sometimes Warped Thinking Is A Good Thing

by Mark E. Lasbury in The 'Scope

As Star Trek’s 50th anniversary approaches, are we getting closer to traveling at light speed? Believe it or not – yes, we are. We have begun to understand and harness the power of antimatter, and the plasma bubble-driven warp drive has moved from silly idea to serious consideration – so much so that NASA has designed a warp drive ship, the IXS Enterprise, of course.... Read more »

S. Beghella-Bartoli, P.M. Bhujbal, A. Nas. (2015) Confirmation of Santilli's detection of antimatter galaxies via a telescope with concave lens. America Journal of Modern Physics, 4(1), 34. info:/

Ganiev, Y., Gordeev, V., Krasilnikov, A., Lagutin, V., Otmennikov, V., & Panasenko, A. (2000) Aerodynamic Drag Reduction by Plasma and Hot-Gas Injection. Journal of Thermophysics and Heat Transfer, 14(1), 10-17. DOI: 10.2514/2.6504  

Ronan Keane, & Wei-Ming Zhang. (2012) Beamed Core Antimatter Propulsion: Engine Design and Optimization. J.Br.Interplanet.Soc. arXiv: 1205.2281v2

  • December 8, 2014
  • 06:59 AM
  • 1,448 views

Standard Model at the horizon

by Marco Frasca in The Gauge Connection

Hawking radiation is one of the most famous effects where quantum field theory combines successfully with general relativity. Since 1975 when Stephen Hawking uncovered it, this results has obtained a enormous consideration and has been derived in a lot of different ways. The idea is that, very near the horizon of a black hole, a […]... Read more »

V. B. Bezerra, H. S. Vieira, & André A. Costa. (2013) The Klein-Gordon equation in the spacetime of a charged and rotating black hole. Class. Quantum Grav. 31 (2014) 045003. arXiv: 1312.4823v1

H. S. Vieira, V. B. Bezerra, & C. R. Muniz. (2014) Exact solutions of the Klein-Gordon equation in the Kerr-Newman background and Hawking radiation. Annals of Physics 350 (2014) 14-28. arXiv: 1401.5397v4

Giovanni Collini, Valter Moretti, & Nicola Pinamonti. (2013) Tunnelling black-hole radiation with $φ^3$ self-interaction: one-loop computation for Rindler Killing horizons. Lett. Math. Phys. 104 (2014) 217-232. arXiv: 1302.5253v4

Marco Frasca. (2009) Exact solutions of classical scalar field equations. J.Nonlin.Math.Phys.18:291-297,2011. arXiv: 0907.4053v2

Marco Frasca. (2013) Scalar field theory in the strong self-interaction limit. Eur. Phys. J. C (2014) 74:2929. arXiv: 1306.6530v5

Marco Frasca. (2014) Hawking radiation and interacting fields. arXiv. arXiv: 1412.1955v1

  • September 21, 2014
  • 04:40 PM
  • 1,565 views

DICE 2014

by Marco Frasca in The Gauge Connection

I have spent this week in Castiglioncello participating to the Conference DICE 2014. This Conference is organized with a cadence of two years with the main efforts due to Thomas Elze. I have been a participant to the 2006 edition where I gave a talk about decoherence and thermodynamic limit (see here and here). This […]... Read more »

Marco Frasca. (2006) Thermodynamic Limit and Decoherence: Rigorous Results. Journal of Physics: Conference Series 67 (2007) 012026. arXiv: quant-ph/0611024v1

Ali H. Chamseddine, Alain Connes, & Viatcheslav Mukhanov. (2014) Quanta of Geometry. arXiv. arXiv: 1409.2471v3

  • May 19, 2014
  • 03:49 PM
  • 727 views

New Thermoelectric Material May Boost Green Tech

by dailyfusion in The Daily Fusion

University of Miami physicist Joshua Cohn and his collaborators report new surprising properties of a metal named lithium purple-bronze (LiPB) that may impact the search for materials useful in power generation, refrigeration, or energy detection.... Read more »

  • May 23, 2013
  • 11:58 AM
  • 708 views

New Method for Clean and Safe Hydrogen Production Proposed

by dailyfusion in The Daily Fusion

Duke University engineers have developed a new safer method for catalytic hydrogen production. According to the authors of the study, it does not require high temperatures and produces smaller amounts of toxic chemicals than other industrial hydrogen production technologies.... Read more »

  • May 15, 2013
  • 12:45 PM
  • 917 views

The Modern Prometheus: Scientists Uncover the Secret of ‘Magnetic Fire’

by dailyfusion in The Daily Fusion

A group of physicists from the New York University have uncovered how energy is released and dispersed in magnetic materials in a process similar to the spread of forest fires. This finding not only has the potential to deepen our understanding of self-sustained chemical reactions, but also could open new exciting possibilities for energy storage.... Read more »

Subedi, P., Vélez, S., Macià, F., Li, S., Sarachik, M., Tejada, J., Mukherjee, S., Christou, G., & Kent, A. (2013) Onset of a Propagating Self-Sustained Spin Reversal Front in a Magnetic System. Physical Review Letters, 110(20). DOI: 10.1103/PhysRevLett.110.207203  

  • January 3, 2013
  • 10:18 PM
  • 1,218 views

Atoms at negative absolute temperatures

by Joerg Heber in All That Matters

Usually we tend to think about temperature as being related to the motion of atoms. At lower temperatures, atomic motions slow down. Absolute zero, defined as zero Kelvin or −273.15 degrees Celsius, then is the point where all atomic motion stops. But what comes beyond that, does something like a negative absolute temperature exist? Indeed, as Ulrich Schneider [...]... Read more »

Braun, S., Ronzheimer, J., Schreiber, M., Hodgman, S., Rom, T., Bloch, I., & Schneider, U. (2013) Negative Absolute Temperature for Motional Degrees of Freedom. Science, 339(6115), 52-55. DOI: 10.1126/science.1227831  

  • November 5, 2012
  • 05:10 AM
  • 971 views

Breaking of a symmetry

by Marco Frasca in The Gauge Connection

This week-end has been somewhat longer in Italy due to November 1st holiday and I have had the opportunity to read a very fine book by Ian Aitchison: Supersymmetry in Particle Physics – An Elementary Introduction. This book gives a very clear introduction to SUSY with all the computations clearly stated and going into the [...]... Read more »

Dimopoulos, S., & Georgi, H. (1981) Softly broken supersymmetry and SU(5). Nuclear Physics B, 193(1), 150-162. DOI: 10.1016/0550-3213(81)90522-8  

Marco Frasca. (2011) Chiral symmetry in the low-energy limit of QCD at finite temperature. Phys. Rev. C 84, 055208 (2011). arXiv: 1105.5274v4

  • September 19, 2012
  • 12:22 PM
  • 1,957 views

Why Reptiles Won't Wear Fur

by Miss Behavior in The Scorpion and the Frog

Have you ever seen a furry lizard? A fuzzy snake? A wooly turtle? Me neither. That's because a reptile in a permanent fur coat would whither like Superman with a pocket full of kryptonite. But why? Other animals are so content in their soft, luxurious layers... Why can't reptiles be?"I wouldn't be caught dead in that fur coat you're wearing". Photo by Naypong at freedigitalphotos.net. Animals exchange heat with their environments in four major ways: conduction, convection, radiation and evaporat........ Read more »

Autumn K, Liang YA, Hsieh ST, Zesch W, Chan WP, Kenny TW, Fearing R, & Full RJ. (2000) Adhesive force of a single gecko foot-hair. Nature, 405(6787), 681-5. PMID: 10864324  

  • June 4, 2012
  • 05:16 AM
  • 1,455 views

Turing machine and Landauer limit

by Marco Frasca in The Gauge Connection

My inactivity period was due to a lack of real news around the World. But I was not inactive at all. My friend Alfonso Farina presented to me another question that occupied my mind for the last weeks: What is the energy cost for computation? The first name that comes to mind in such a [...]... Read more »

Bennett, C. (2003) Notes on Landauer's principle, reversible computation, and Maxwell's Demon. Studies In History and Philosophy of Science Part B: Studies In History and Philosophy of Modern Physics, 34(3), 501-510. DOI: 10.1016/S1355-2198(03)00039-X  

Bérut, A., Arakelyan, A., Petrosyan, A., Ciliberto, S., Dillenschneider, R., & Lutz, E. (2012) Experimental verification of Landauer’s principle linking information and thermodynamics. Nature, 483(7388), 187-189. DOI: 10.1038/nature10872  

Marco Frasca. (2012) Probabilistic Turing Machine and Landauer Limit. arXiv. arXiv: 1206.0207v1

  • April 13, 2012
  • 01:39 AM
  • 2,313 views

A White Roof: So Simple It's Insane So Insane It Just Might Work

by DJ Busby in Astronasty

Reflectivity might work better at mitigating global warming than focus on CO2... Read more »

  • March 22, 2012
  • 02:52 PM
  • 1,670 views

Viewing Nanoparticles in 3D

by Jason Carr in Wired Cosmos

UCLA researchers are now able to peer deep within the world’s tiniest structures to create three-dimensional images of individual atoms and their positions. Their research, published March 22 in the journal Nature (cited below), presents a new method for directly measuring the atomic structure of nanomaterials. “This is the first experiment where we can directly see local [...]... Read more »

M. C. Scott, Chien-Chun Chen, Matthew Mecklenburg, Chun Zhu, Rui Xu, Peter Ercius, Ulrich Dahmen, B. C. Regan, & Jianwei Miao. (2011) Electron tomography at 2.4 Å resolution. Nature. arXiv: 1108.5350v4

  • March 3, 2012
  • 09:40 AM
  • 1,679 views

do warp drives emit tachyon shockwaves?

by Greg Fish in weird things

Speaking of space-based weapons, here’s an interesting one for you. Once upon a time, when writing about warp drive physics, I asked whether the creation of a warp bubble by a superluminal ship could have some very nasty effects on any nearby planets due to the energy involved, and had my fears validated by a [...]... Read more »

Brendan McMonigal, Geraint F. Lewis, & Philip O'Byrne. (2012) The Alcubierre Warp Drive: On the Matter of Matter. Physical Review D. arXiv: 1202.5708v1

  • October 29, 2011
  • 09:09 PM
  • 1,409 views

Using An Array of Cameras to Accurately Model a Flickering Flame

by DJ Busby in Astronasty

This experiment in the fluid dynamics video demonstrated that a three-dimensional flame can be reconstructed by combining images from multiple cameras using synthetic aperture imaging.... Read more »

Preston Murray, Jonathon Pendlebury, Dale Tree, & Tadd Truscott. (2011) Flame Reconstruction Using Synthetic Aperture Imaging. arXiv. arXiv: 1110.3700v1

  • May 2, 2011
  • 10:55 AM
  • 2,404 views

Proving Einstein Wrong...ish: Measurement of the Instantaneous Velocity of a Brownian Particle

by Chad Orzel in Uncertain Principles

Last summer, there was a fair bit of hype about a paper from Mark Raizen's group at Texas which was mostly reported with an "Einstein proven wrong" slant, probably due to this press release. While it is technically true that they measured something Einstein said would be impossible to measure, that framing is a little unfair to Einstein. It does draw media attention, though...

The experiment in question involves Brownian motion, and since I had to read up on that anyway for something else, I th........ Read more »

Li, T., Kheifets, S., Medellin, D., & Raizen, M. (2010) Measurement of the Instantaneous Velocity of a Brownian Particle. Science, 328(5986), 1673-1675. DOI: 10.1126/science.1189403  

  • March 2, 2011
  • 11:39 AM
  • 2,121 views

White Roofs and Global Warming

by Arunn in nOnoScience (a.k.a. Unruled Notebook)

Let us discuss white roofing our homes, to reduce the urban heat island effect. This in turn could also help reduce global warming. A material can reflect, transmit, absorb and emit visible, infra-red and ultraviolet radiation coming from the Sun. Most materials do all of this in varying degrees so we express these properties as [...]... Read more »

  • December 27, 2010
  • 07:19 AM
  • 2,229 views

2010 – twelve months of great science

by Joerg Heber in All That Matters

The past year has been a great year for science with major advances in several areas. Too many exciting results to mention here. Instead, to reflect about the past year I have chosen a representative paper for each month of the year that I hope can serve as an example of the great science going [...]... Read more »

Chuang, T., Allan, M., Lee, J., Xie, Y., Ni, N., Bud'ko, S., Boebinger, G., Canfield, P., & Davis, J. (2010) Nematic Electronic Structure in the "Parent" State of the Iron-Based Superconductor Ca(Fe1-xCox)2As2. Science, 327(5962), 181-184. DOI: 10.1126/science.1181083  

Lin, Y., Dimitrakopoulos, C., Jenkins, K., Farmer, D., Chiu, H., Grill, A., & Avouris, P. (2010) 100-GHz Transistors from Wafer-Scale Epitaxial Graphene. Science, 327(5966), 662-662. DOI: 10.1126/science.1184289  

Kelzenberg, M., Boettcher, S., Petykiewicz, J., Turner-Evans, D., Putnam, M., Warren, E., Spurgeon, J., Briggs, R., Lewis, N., & Atwater, H. (2010) Enhanced absorption and carrier collection in Si wire arrays for photovoltaic applications. Nature Materials. DOI: 10.1038/nmat2635  

Ergin, T., Stenger, N., Brenner, P., Pendry, J., & Wegener, M. (2010) Three-Dimensional Invisibility Cloak at Optical Wavelengths. Science, 328(5976), 337-339. DOI: 10.1126/science.1186351  

Yu, X., Onose, Y., Kanazawa, N., Park, J., Han, J., Matsui, Y., Nagaosa, N., & Tokura, Y. (2010) Real-space observation of a two-dimensional skyrmion crystal. Nature, 465(7300), 901-904. DOI: 10.1038/nature09124  

Chadov, S., Qi, X., Kübler, J., Fecher, G., Felser, C., & Zhang, S. (2010) Tunable multifunctional topological insulators in ternary Heusler compounds. Nature Materials, 9(7), 541-545. DOI: 10.1038/nmat2770  

Bae, S., Kim, H., Lee, Y., Xu, X., Park, J., Zheng, Y., Balakrishnan, J., Lei, T., Ri Kim, H., Song, Y.... (2010) Roll-to-roll production of 30-inch graphene films for transparent electrodes. Nature Nanotechnology, 5(8), 574-578. DOI: 10.1038/NNANO.2010.132  

MAIMAN, T. (1960) Stimulated Optical Radiation in Ruby. Nature, 187(4736), 493-494. DOI: 10.1038/187493a0  

Kim, R., Kim, D., Xiao, J., Kim, B., Park, S., Panilaitis, B., Ghaffari, R., Yao, J., Li, M., Liu, Z.... (2010) Waterproof AlInGaP optoelectronics on stretchable substrates with applications in biomedicine and robotics. Nature Materials, 9(11), 929-937. DOI: 10.1038/nmat2879  

Wunderlich, J., Park, B., Irvine, A., Zarbo, L., Rozkotova, E., Nemec, P., Novak, V., Sinova, J., & Jungwirth, T. (2010) Spin Hall Effect Transistor. Science, 330(6012), 1801-1804. DOI: 10.1126/science.1195816  

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