f(R) Theories of Gravity - Physics Frontiers

What this episode covers

Jim and Randy discuss gravitational theories that modify general relativity by changing the action using a polynomial dependence on the Ricci scalar. Although not physically motivated, some of these theories produce effects similar to those of dark matter, dark energy, and cosmological constants. Show notes: http://frontiers.physicsfm.com/9

Share this episode

Similar Episodes

Rivian's software chief thinks you don't need CarPlay or buttons

May 28, 2026 ·69m

How Sundar Pichai is rethinking Google for the AI era

May 26, 2026 ·51m

Musk v Altman: Much ado about nothing

May 21, 2026 ·34m

Exclusive: Jonah Peretti explains why he sold BuzzFeed

May 18, 2026 ·70m

How companies weaponize the terms of service against you

May 14, 2026 ·54m

Joanna Stern is not a robot, but she lived with them

May 11, 2026 ·60m

Similar Podcasts

Lynne's Podcast Lynne August MD Dr. A offers her interpretations and applications of Dr. Revici’s profound research at DrRevici.com and the Revici Journal. Dr. Revici was arguably fifty to one hundred years ahead of his time in his application of quantum physics to medical sciences. As a once-aspiring physicist, this alone propelled Dr. A to Dr. Revici. As a physician, she felt compelled, and in some palpable way responsible, to understand Dr. Revici’s ability to control pain and achieve remissions in terminal cancer patients with his non-toxic “guided chemotherapy”, even many cancers that conventional therapy failed to control. Most of the time his questions and solutions were as unprecedented as they were effective. While Dr. Revici was primarily focused on cancer, Dr. A’s research and therapeutics to prevent and treat all chronic and degenerative disease can transform 21st century medicine. Controlled Pod Into Terrain J, Kyra and Ariadne A multimedia podcast about aviation accidents, featuring Kyra Dempsey (aka Admiral Cloudberg), Ariadne (aka the business knowing one) and J (aka the systems and physics knowing one) Best experienced with pictures at https://www.youtube.com/@controlledpodintoterrain Federico Federici - Podcast Federico Federici The Federico Federici Podcast is a non-periodical publication based on the posts from the blog http://leserpent.wordpress.com, the books from the “Libri Della Neve” series and the magazine “Die Leere Mitte”. Whether you are a devotee or a newcomer to literature, physics, mathematics, conceptual art, modernism, experimental writing, sound poetry, asemic writing, vispo, you are welcome to subscribe to this podcast and enjoy the diverse world of contemporary production. CrowdScience BBC World Service We take your questions about life, Earth and the universe to researchers hunting for answers at the frontiers of knowledge.

Frequently Asked Questions

How long is this episode of Physics Frontiers?

This episode is 37 minutes long.

When was this Physics Frontiers episode published?

This episode was published on June 2, 2017.

What is this episode about?

Jim and Randy discuss gravitational theories that modify general relativity by changing the action using a polynomial dependence on the Ricci scalar. Although not physically motivated, some of these theories produce effects similar to those of dark...

Can I download this Physics Frontiers episode?

Yes, you can download this episode by clicking the download button on the episode player, or subscribe to the podcast in your preferred podcast app for automatic downloads.