PeterDonis's latest activity

Of course that's wrong. The Einstein Field Equation works just fine with a positive, zero, or negative cosmological constant. All models...

Not. Even if it turns out that there is no dark energy and the expansion of the universe is not accelerating, that doesn't mean the...

Where? Please give a link to the specific thread.

I marked this thread as "A" level for a reason. You've gotten some good general responses, but be aware that you might not be able to...

We use Type 1a supernovae to estimate distances because how bright they are is well correlated with various other characteristics like...

Yes it does, because a tetrad by definition has four mutually orthogonal vectors.

@DmitryS you have made the same error multiple times now, and have persisted in it despite repeated corrections. Enough is enough. The...

Yes, there is a problem. The problem is here: That is false. The source of light is current and charge densities, as described by...

The thread title is the first part of the title of a paper published just today [1]. Here is the abstract: [1]...

The OP was asking about an individual person's mass affecting their perception of time. That is not only "not noticeable in common...

This is very vague. The correct statement is that the curvature of spacetime is affected by the presence of stress-energy, via the...

You can do this, but you can't do it by only transforming the spatial coordinates from a standard inertial frame. In fact, the simplest...

This is not a correct claim. You need to be very, very careful interpreting anything involving pseudotensors. The Schwarzschild BH is...

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Maybe it would help to imagine two flash bulbs, one in motion relative to the other. They both flash when one just passes the other. In...