Future Train Wreck: Mine or Modern Physics talk Next Thursday, Jan. 26

If you are in Cambridge, MA on Thursday, Jan. 26, you can see me live at MIT in room 3-270 from...

Holiday Physics Card, 2016

Just put them in the mail on December 24...It was a fun year of thinking, whether the idea is right...

Unified Mathematical Field Theory Talk

I gave a 15 minute talk at a local Americal Physical Society Meeting.  Here is the title and...

Holiday Card 2015

Here is my holiday card for 2015, a tradition of mine going back to 1990.  Enjoy.On the back...

 Doug Sweetser Trying to be a semi-pro amateur physicist (yes I accept special relativity is right!). I _had_ my own effort to unify gravity with other forces in Nature. It ran into quite a number of technically... Read More » Blogroll

# Scalar Gravity Theories and Frame Dragging

Aug 06 2014 | comment(s)

Henry Brown made the following statement:

# The Action of General Relativity

May 18 2014 | comment(s)

In this blog, I will review my thoughts on the action of general relativity, how it is used for the field equations and equations of motion.  There is much to consider, so perhaps this will create a means for discussing this deep subject.

The Action

# Rescinded: Upgrading Newton's Universal Gravity Law using Actions

Feb 21 2014 | comment(s)

I will try to keep my Newtonian wig on. Digressions will be in well-defined sidebars. Time to serve the meat and potatoes.

The Action for the Newtonian Gravitational Field

Two things go into this action: a mass density and a scalar field:

\begin{align*} S_{_{NGF}}&= \int \mathcal{L}(\Phi, \nabla \Phi)\\ &= \int d^4 x \left(-\rho\, \Phi - \frac{c^2}{2 G} (\nabla \Phi)^2\right ) \end{align*}

This blog is straight old Newtonian gravity. A goal is to understand where the three kinds of masses in Newton's Universal Law of Gravity live in the context of the action.

# Holiday Card, 2013

Dec 24 2013 | comment(s)

Another year, another card inspired by what I am thinking about in physics.

Inside the card it reads...

Time is not space,