Physics Frontiers

Latest Episodes:

Retrocausality Jul 25, 2018

Show notes

Jim and Randy look at how quantum mechanics is affected by time. Most importantly, what happens when temporal boundary conditions are used to create standing waves in the wave function of a particle?
Show Notes: http://frontiers.physicsfm.com/33

Tunneling Time Jul 07, 2018

Show notes

Jim talks to Randy about the amount of time it takes for an electron to tunnel through a forbidden region of space. Astoundingly, how quickly this happens has been a subject of debate for eighty years and is still unresolved.
Show Notes: http://frontiers.physicsfm.com/32

Post-Newtonian Gravitation Jun 08, 2018

Show notes

Jim discusses the Parameterized Post-Newtonian formalism with Randy. The PPN framework is a general, linearized metric theory of gravity that can simulate all metric theories of gravity and compare them to solar system sized experiments.
Show Notes: http://frontiers.physicsfm.com/31

The Consistent Histories Interpretation of Quantum Mechanics May 24, 2018

Show notes

Jim and Randy discuss the consistent histories interpretation of quantum mechanics. The brainchild of Robert Griffiths and with a surprisingly strong set of supporters, Consistent Histories seems to be a strong, logical description of what happens in the quantum world.
Show Notes: http://frontiers.physicsfm.com/30

Gravitational Alternatives to Dark Energy May 16, 2018

Show notes

Jim and Randy discuss how modifications to general relativity can be used to mimic the effects of dark energy. They discuss various forms of gravitational theory that can do the job, as well as the field particles that mediate their "fifth force."
Show Notes: http://frontiers.physicsfm.com/29

The Quantum Vacuum and the Casimir Effect Apr 25, 2018

Show notes

Jim and Randy review two very convincing papers that make the claim that the Casimir effect is due to materials fluctuations and not the zero point energy.
Show Notes: http://frontiers.physicsfm.com/28

The Gravitational Equivalence Principles Apr 15, 2018

Show notes

Jim talks to Randy about the different ways in which the equivalence principle of general relativity can be formulated. More than just the equivalence of accelerations, the different possible meanings of the equivalence principle mean different things about how gravity works. From weak to strong, from Einstein's equivalence principle to Schiff's conjecture, the implications of these theories are explored.
Show Notes: http://frontiers.physicsfm.com/27

Antimatter Production at a Potential Boundary Mar 25, 2018

Show notes

Randy shows Jim an idea for generating antimatter using the Casimir effect that doesn't require a collider.
Show Notes: http://frontiers.physicsfm.com/26

Gravitational Field Propulsion Mar 16, 2018

Show notes

Randy introduces Jim to several ways in which people have theorized that gravity can be used to propel an object through space. The slingshot effect is the only proven method here, but people have found many ways that theoretically could induce propulsion taking advantage of non-commutative motions in space-time, negative inertia, artificially-induced gravitational dipoles, and creating bubbles in space-time.
Show Notes: http://frontiers.physicsfm.com/25

The Island of Stability Feb 24, 2018

Show notes

Randy tells Jim about the island of stability: a theoretically predicted oasis of stable nuclear isotopes that researchers keep getting nearer and nearer to discovering. Randy and Jim talk about what they are, how researchers are trying to produce the isotopes, and the theoretical methods that predict their existence.
Show Notes: http://frontiers.physicsfm.com/24

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