Post List

All posts; Tags Include "Gravitation"

(Modify Search »)

  • April 25, 2015
  • 11:53 AM

NASA and warp drive: An update

by Marco Frasca in The Gauge Connection

There is some excitement in the net about some news of Harold White’s experiment at NASA. I have uncovered it by chance at a forum. This is a well-frequented site with people at NASA posting on it and regularly updating about the work that they are carrying out. You can also have noticed some activity […]... Read more »

Marco Frasca. (2005) Strong coupling expansion for general relativity. Int.J.Mod.Phys.D15:1373-1386,2006. arXiv: hep-th/0508246v3

  • August 26, 2010
  • 12:42 PM

Measuring Gravity: Ain't Nothin' but a G Thing

by Chad Orzel in Uncertain Principles

There's a minor scandal in fundamental physics that doesn't get talked about much, and it has to do with the very first fundamental force discovered, gravity. The scandal is the value of Newton's gravitational constant G, which is the least well known of the fundamental constants, with a value of 6.674 28(67) x 10-11 m3 kg-1 s-2. That may seem pretty precise, but the uncertainty (the two digits in parentheses) is scandalously large when compared to something like Planck's constant at 6.626 068 9........ Read more »

Schlamminger, S., Holzschuh, E., Kündig, W., Nolting, F., Pixley, R., Schurr, J., & Straumann, U. (2006) Measurement of Newton’s gravitational constant. Physical Review D, 74(8). DOI: 10.1103/PhysRevD.74.082001  

Luo, J., Liu, Q., Tu, L., Shao, C., Liu, L., Yang, S., Li, Q., & Zhang, Y. (2009) Determination of the Newtonian Gravitational Constant G with Time-of-Swing Method. Physical Review Letters, 102(24). DOI: 10.1103/PhysRevLett.102.240801  

Harold V. Parks, & James E. Faller. (2010) A Simple Pendulum Determination of the Gravitational Constant. Physical Review Letters (accepted). arXiv: 1008.3203v2

  • July 19, 2010
  • 12:19 PM

This Week in the Universe: July 13th – July 19th

by S.C. Kavassalis in The Language of Bad Physics

What have people been talking about this week in high energy physics, astrophysics, gravitation, general relativity and quantum gravity?... Read more »

F. Courbin, M. Tewes, S. G. Djorgovski, D. Sluse, A. Mahabal, F. Rerat, & G. Meylan. (2010) First case of strong gravitational lensing by a QSO : SDSS J0013 1523 at z . Astronomy . arXiv: 1002.4991v2

Daniel T. Cumberbatch, Joyce. A. Guzik, Joseph Silk, L. Scott Watson, & Stephen M. West. (2010) Light WIMPs in the Sun: Constraints from Helioseismology. arXiv. arXiv: 1005.5102v1

Eugenio Bianchi, & Carlo Rovelli. (2010) Why all these prejudices against a constant?. arXiv. arXiv: 1002.3966v3

Attila Meszaros, Lajos G. Balazs, Zsolt Bagoly, & Peter Veres. (2010) Impact on cosmology of the celestial anisotropy of the short gamma-ray bursts. Baltic Astronomy, Vol.18, 293-296 (2009). arXiv: 1005.1558v1

Chris Clarkson, & Roy Maartens. (2010) Inhomogeneity and the foundations of concordance cosmology. Class. Quantum Grav. 27 124008 (2010). arXiv: 1005.2165v2

Mosconi, M., Fujii, K., Mengoni, A., Domingo-Pardo, C., Käppeler, F., Abbondanno, U., Aerts, G., Álvarez-Pol, H., Alvarez-Velarde, F., Andriamonje, S.... (2010) Neutron physics of the Re/Os clock. I. Measurement of the (n,γ) cross sections of ^{186,187,188}Os at the CERN n_TOF facility. Physical Review C, 82(1). DOI: 10.1103/PhysRevC.82.015802  

Nikodem J. Poplawski. (2010) Cosmology with torsion - an alternative to cosmic inflation. arXiv. arXiv: 1007.0587v1

Petr Horava, & Charles M. Melby-Thompson. (2010) General Covariance in Quantum Gravity at a Lifshitz Point. arXiv. arXiv: 1007.2410v1

Samuel E. Gralla, & Robert M. Wald. (2009) Derivation of Gravitational Self-Force. arXiv. arXiv: 0907.0414v1

J. Ambjorn, A. Goerlich, J. Jurkiewicz, & R. Loll. (2010) CDT---an Entropic Theory of Quantum Gravity. arXiv. arXiv: 1007.2560v1

  • June 28, 2010
  • 06:18 PM

This Week in the Universe: June 22nd – June 28th

by S.C. Kavassalis in The Language of Bad Physics

What have people been talking about this week in high energy physics, astrophysics, gravitation, general relativity and quantum gravity, and a little bit of quantum mechanics?... Read more »

Lyne, A., Hobbs, G., Kramer, M., Stairs, I., & Stappers, B. (2010) Switched Magnetospheric Regulation of Pulsar Spin-Down. Science. DOI: 10.1126/science.1186683  

H. Rampadarath, M. A. Garrett, G. I. G. Józsa, T. Muxlow, T. A. Oosterloo, Z. Paragi1, R. Beswick, H. van Arkel, W. C. Keel, & K. Schawinski. (2010) Hanny's Voorwerp: Evidence of AGN activity and a nuclear starburst in the central regions of IC 2497. arXiv. arXiv: 1006.4096v1

Norbert Przybilla, Alfred Tillich, Ulrich Heber, & Ralf-Dieter Scholz. (2010) Weighing the Galactic dark matter halo: a lower mass limit from the fastest halo star known. arXiv. arXiv: 1005.5026v1

Andresen, G., Bertsche, W., Bowe, P., Bray, C., Butler, E., Cesar, C., Chapman, S., Charlton, M., Fajans, J., & Fujiwara, M. (2010) Antihydrogen formation dynamics in a multipolar neutral anti-atom trap. Physics Letters B, 685(2-3), 141-145. DOI: 10.1016/j.physletb.2010.01.066  

Shaun A. Thomas, Filipe B. Abdalla, & Ofer Lahav. (2010) Upper bound of 0.28 eV on neutrino masses from the largest photometric redshift survey. |Physical Review Letters. info:/

Ian D. Leroux, Monika H. Schleier-Smith, & Vladan Vuletić. (2010) Orientation-Dependent Entanglement Lifetime in a Squeezed Atomic Clock. Physical Review Letters. info:/10.1103/PhysRevLett.104.250801

Schultze, M., Fiess, M., Karpowicz, N., Gagnon, J., Korbman, M., Hofstetter, M., Neppl, S., Cavalieri, A., Komninos, Y., Mercouris, T.... (2010) Delay in Photoemission. Science, 328(5986), 1658-1662. DOI: 10.1126/science.1189401  

  • June 21, 2010
  • 10:30 PM

This Week in the Universe: June 15th – June 21st, 2010

by S.C. Kavassalis in The Language of Bad Physics

What have people been talking about this week in high energy physics, astrophysics, gravitation, general relativity and quantum gravity?... Read more »

T. van Zoest, N. Gaaloul, Y. Singh, H. Ahlers, W. Herr, S. T. Seidel, W. Ertmer, E. Rasel, M. Eckart, E. Kajari, S. Arnold, G. Nandi, W. P. Schleich, R. Walser, A. Vogel, K. Sengstock, K. Bongs, W. Lewoczko-Adamczyk, M. Schiemangk, T. Schuldt, A. Peters, . (2010) Bose-Einstein Condensation in Microgravity. Science , 328(5985), 1540-1543. info:/10.1126/science.1189164

Andrea Mehner, Kris Davidson, Roberta M. Humphreys, John C. Martin, Kazunori Ishibashi, Gary J. Ferland, & Nolan R. Walborn. (2010) A Sea Change in Eta Carinae. arXiv. arXiv: 1004.3529v3

Bogdan A. Dobrescu, Patrick J. Fox, & Adam Martin. (2010) CP violation in B_s mixing from heavy Higgs exchange. arXiv. arXiv: 1005.4238v2

join us!

Do you write about peer-reviewed research in your blog? Use to make it easy for your readers — and others from around the world — to find your serious posts about academic research.

If you don't have a blog, you can still use our site to learn about fascinating developments in cutting-edge research from around the world.

Register Now

Research Blogging is powered by SRI Technology.

To learn more, visit