Browse Physics

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41.

Focus

Deriving Dimensions

Phys. Rev. Focus 14, 13 (2004) – Published September 28, 2004

New calculations show how the four dimensions we take for granted emerge from the “quantum foam” of spacetime.

42.

Focus

Landmarks: Forgotten Black Hole Birth

Phys. Rev. Focus 13, 23 (2004) – Published May 28, 2004

The modern concept of a black hole came from a 1939 paper by atom bomb physicist J. Robert Oppenheimer.

43.

Focus

Revising Gravity

Phys. Rev. Focus 12, 12 (2003) – Published October 9, 2003

The gravitational force between ordinary matter and dark matter may defy Newton’s law.

44.

Focus

Light-Speed Submarine

Phys. Rev. Focus 12, 4 (2003) – Published July 25, 2003

A seeming paradox in relativity involving a near-light-speed submarine has now been resolved.

45.

Focus

How Does Your Black Hole Grow?

Phys. Rev. Focus 10, 27 (2002) – Published December 13, 2002

Researchers can finally describe the inexorable growth of a black hole quantitatively.

46.

Focus

Ring Around the Singularity

Phys. Rev. Focus 9, 13 (2002) – Published March 5, 2002

Rotating, donut-shaped black holes may exist if our universe contains extra dimensions.

47.

Focus

Big Spheres to Catch Gravity Waves

Phys. Rev. Focus 8, 3 (2001) – Published July 13, 2001

A proposed detector made of two concentric spheres might spot gravitational waves that more conventional detectors won’t.

48.

Focus

Magnetic Fields Smooth Space

Phys. Rev. Focus 7, 27 (2001) – Published June 6, 2001

Magnetic field lines do not like to bend, so when the space around them becomes warped by large masses, the fields fight back.

49.

Focus

Newton’s Still Correct

Phys. Rev. Focus 7, 8 (2001) – Published February 15, 2001

Extra spatial dimensions–beyond the three we know–could alter Newton’s inverse-square law of gravity at short distances. But new measurements show that Newton is correct down to at least 200 micrometers.

50.

Focus

Earth’s Peculiar Neighbors

Phys. Rev. Focus 4, 16 (1999) – Published September 24, 1999

Physicists have discovered several new types of orbits for near-Earth asteroids, including the possibility of undiscovered satellites of Earth.

51.

Focus

Wormhole Construction: Proceed with Caution

Phys. Rev. Focus 2, 7 (1998) – Published August 3, 1998

Theorists prove that ‘exotic matter’ is necessary for cosmic shortcuts called wormholes to exist.

52.

Focus

Moving a Black Hole

Phys. Rev. Focus 1, 3 (1998) – Published March 25, 1998

Simulation of a moving black hole

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