Re: Questions about the Equivalence Principle (EP) and GR

Did Einstein "derive" the field equation using the 5 postulates of GR, or did he guess what they had to be based on what the postulates implied? I ask this because I recall reading that the field equations published in his 1916 paper were those he had rejected around 1913. How could the final

Re: Questions about the Equivalence Principle (EP) and GR

On Wednesday, April 24, 2019 at 8:59:52 PM UTC-5, Brent wrote: > > > > On 4/24/2019 6:36 PM, agrays...@gmail.com wrote: > > > > On Wednesday, April 24, 2019 at 6:46:49 PM UTC-6, Brent wrote: >> >> >> >> On 4/24/2019 4:17 PM, agrays...@gmail.com wrote: >> >> >> >> On Wednesday, April 24, 2019

Re: Questions about the Equivalence Principle (EP) and GR

On Wednesday, April 24, 2019 at 6:17:14 PM UTC-5, agrays...@gmail.com wrote: > > > > On Wednesday, April 24, 2019 at 5:11:13 PM UTC-6, agrays...@gmail.com > wrote: >> >> >> >> On Wednesday, April 24, 2019 at 3:34:28 PM UTC-6, Brent wrote: >>> >>> >>> >>> On 4/21/2019 7:35 PM,

Re: Questions about the Equivalence Principle (EP) and GR

On 4/24/2019 6:36 PM, agrayson2...@gmail.com wrote: On Wednesday, April 24, 2019 at 6:46:49 PM UTC-6, Brent wrote: On 4/24/2019 4:17 PM, agrays...@gmail.com wrote: On Wednesday, April 24, 2019 at 5:11:13 PM UTC-6, agrays...@gmail.com wrote: On Wednesday, April

Re: Questions about the Equivalence Principle (EP) and GR

On Wednesday, April 24, 2019 at 6:46:49 PM UTC-6, Brent wrote: > > > > On 4/24/2019 4:17 PM, agrays...@gmail.com wrote: > > > > On Wednesday, April 24, 2019 at 5:11:13 PM UTC-6, agrays...@gmail.com > wrote: >> >> >> >> On Wednesday, April 24, 2019 at 3:34:28 PM UTC-6, Brent wrote: >>> >>>

Re: Questions about the Equivalence Principle (EP) and GR

On 4/24/2019 4:17 PM, agrayson2...@gmail.com wrote: On Wednesday, April 24, 2019 at 5:11:13 PM UTC-6, agrays...@gmail.com wrote: On Wednesday, April 24, 2019 at 3:34:28 PM UTC-6, Brent wrote: On 4/21/2019 7:35 PM, agrays...@gmail.com wrote: On Sunday, April 21,

Re: Questions about the Equivalence Principle (EP) and GR

On Wednesday, April 24, 2019 at 6:04:43 PM UTC-6, Brent wrote: > > > > On 4/24/2019 4:11 PM, agrays...@gmail.com wrote: > > > > On Wednesday, April 24, 2019 at 3:34:28 PM UTC-6, Brent wrote: >> >> >> >> On 4/21/2019 7:35 PM, agrays...@gmail.com wrote: >> >> >> >> On Sunday, April 21, 2019 at

Re: Questions about the Equivalence Principle (EP) and GR

On 4/24/2019 4:11 PM, agrayson2...@gmail.com wrote: On Wednesday, April 24, 2019 at 3:34:28 PM UTC-6, Brent wrote: On 4/21/2019 7:35 PM, agrays...@gmail.com wrote: On Sunday, April 21, 2019 at 8:07:28 PM UTC-6, Brent wrote: On 4/21/2019 6:31 PM, agrays...@gmail.com

Re: Questions about the Equivalence Principle (EP) and GR

On Wednesday, April 24, 2019 at 5:11:13 PM UTC-6, agrays...@gmail.com wrote: > > > > On Wednesday, April 24, 2019 at 3:34:28 PM UTC-6, Brent wrote: >> >> >> >> On 4/21/2019 7:35 PM, agrays...@gmail.com wrote: >> >> >> >> On Sunday, April 21, 2019 at 8:07:28 PM UTC-6, Brent wrote: >>> >>> >>>

Re: Questions about the Equivalence Principle (EP) and GR

On Wednesday, April 24, 2019 at 3:34:28 PM UTC-6, Brent wrote: > > > > On 4/21/2019 7:35 PM, agrays...@gmail.com wrote: > > > > On Sunday, April 21, 2019 at 8:07:28 PM UTC-6, Brent wrote: >> >> >> >> On 4/21/2019 6:31 PM, agrays...@gmail.com wrote: >> >> *Here's something odd. At 9:45 in

Re: Questions about the Equivalence Principle (EP) and GR

On 4/21/2019 7:35 PM, agrayson2...@gmail.com wrote: On Sunday, April 21, 2019 at 8:07:28 PM UTC-6, Brent wrote: On 4/21/2019 6:31 PM, agrays...@gmail.com wrote: *Here's something odd. At 9:45 in Susskind's Lecture 2 on GR, he says the metric tensor is a Kronecker delta

Re: Questions about the Equivalence Principle (EP) and GR

On Wednesday, April 24, 2019 at 11:29:36 AM UTC-6, agrays...@gmail.com wrote: > > > > On Wednesday, April 24, 2019 at 11:06:10 AM UTC-6, Bruno Marchal wrote: >> >> >> On 23 Apr 2019, at 13:39, agrays...@gmail.com wrote: >> >> >> >> On Tuesday, April 23, 2019 at 4:00:26 AM UTC-6, Bruno Marchal

Re: Questions about the Equivalence Principle (EP) and GR

On Wednesday, April 24, 2019 at 11:06:10 AM UTC-6, Bruno Marchal wrote: > > > On 23 Apr 2019, at 13:39, agrays...@gmail.com wrote: > > > > On Tuesday, April 23, 2019 at 4:00:26 AM UTC-6, Bruno Marchal wrote: >> >> >> On 20 Apr 2019, at 23:14, agrays...@gmail.com wrote: >> >> >> >> On Friday,

Re: Questions about the Equivalence Principle (EP) and GR

> On 23 Apr 2019, at 13:39, agrayson2...@gmail.com wrote: > > > > On Tuesday, April 23, 2019 at 4:00:26 AM UTC-6, Bruno Marchal wrote: > >> On 20 Apr 2019, at 23:14, agrays...@gmail.com wrote: >> >> >> >> On Friday, April 19, 2019 at 2:53:00 AM UTC-6, Bruno Marchal wrote: >> >>> On 19

Re: Questions about the Equivalence Principle (EP) and GR

On Tuesday, April 23, 2019 at 4:00:26 AM UTC-6, Bruno Marchal wrote: > > > On 20 Apr 2019, at 23:14, agrays...@gmail.com wrote: > > > > On Friday, April 19, 2019 at 2:53:00 AM UTC-6, Bruno Marchal wrote: >> >> >> On 19 Apr 2019, at 04:08, agrays...@gmail.com wrote: >> >> >> >> On Thursday,

Re: Questions about the Equivalence Principle (EP) and GR

> On 21 Apr 2019, at 08:07, Philip Thrift wrote: > > > > On Saturday, April 20, 2019 at 4:14:27 PM UTC-5, agrays...@gmail.com wrote: > > > On Friday, April 19, 2019 at 2:53:00 AM UTC-6, Bruno Marchal wrote: > >> On 19 Apr 2019, at 04:08, agrays...@gmail.com <> wrote: >> >> >> >> On

Re: Questions about the Equivalence Principle (EP) and GR

> On 20 Apr 2019, at 23:14, agrayson2...@gmail.com wrote: > > > > On Friday, April 19, 2019 at 2:53:00 AM UTC-6, Bruno Marchal wrote: > >> On 19 Apr 2019, at 04:08, agrays...@gmail.com wrote: >> >> >> >> On Thursday, April 18, 2019 at 6:53:33 PM UTC-6, Brent wrote: >> Sorry, I don't

Re: Questions about the Equivalence Principle (EP) and GR

On Sunday, April 21, 2019 at 6:59:25 PM UTC-5, agrays...@gmail.com wrote: > > > > On Sunday, April 21, 2019 at 5:54:33 PM UTC-6, Brent wrote: >> >> >> >> On 4/21/2019 2:20 AM, agrays...@gmail.com wrote: >> >> >> >> On Saturday, April 20, 2019 at 9:51:13 PM UTC-6, Brent wrote: >>> >>> >>> >>> On

Re: Questions about the Equivalence Principle (EP) and GR

On Sunday, April 21, 2019 at 8:07:28 PM UTC-6, Brent wrote: > > > > On 4/21/2019 6:31 PM, agrays...@gmail.com wrote: > > *Here's something odd. At 9:45 in Susskind's Lecture 2 on GR, he says the > metric tensor is a Kronecker delta function. But I could swear that the > diagonal of -1,1,1,1

Re: Questions about the Equivalence Principle (EP) and GR

On 4/21/2019 6:31 PM, agrayson2...@gmail.com wrote: *Here's something odd. At 9:45 in Susskind's Lecture 2 on GR, he says the metric tensor is a Kronecker delta function. But I could swear that the diagonal of -1,1,1,1 represents flat space in SR. AG * What's odd about that?  Flat space is

Re: Questions about the Equivalence Principle (EP) and GR

On Sunday, April 21, 2019 at 5:59:25 PM UTC-6, agrays...@gmail.com wrote: > > > > On Sunday, April 21, 2019 at 5:54:33 PM UTC-6, Brent wrote: >> >> >> >> On 4/21/2019 2:20 AM, agrays...@gmail.com wrote: >> >> >> >> On Saturday, April 20, 2019 at 9:51:13 PM UTC-6, Brent wrote: >>> >>> >>> >>> On

Re: Questions about the Equivalence Principle (EP) and GR

On Sunday, April 21, 2019 at 5:54:33 PM UTC-6, Brent wrote: > > > > On 4/21/2019 2:20 AM, agrays...@gmail.com wrote: > > > > On Saturday, April 20, 2019 at 9:51:13 PM UTC-6, Brent wrote: >> >> >> >> On 4/20/2019 2:14 PM, agrays...@gmail.com wrote: >> >> The following (long!) video can also

Re: Questions about the Equivalence Principle (EP) and GR

On 4/21/2019 2:20 AM, agrayson2...@gmail.com wrote: On Saturday, April 20, 2019 at 9:51:13 PM UTC-6, Brent wrote: On 4/20/2019 2:14 PM, agrays...@gmail.com wrote: The following (long!) video can also help (well, it did help me)

Re: Questions about the Equivalence Principle (EP) and GR

On Sunday, April 21, 2019 at 5:23:33 AM UTC-5, agrays...@gmail.com wrote: > > > > On Sunday, April 21, 2019 at 12:07:07 AM UTC-6, Philip Thrift wrote: >> >> >> >> On Saturday, April 20, 2019 at 4:14:27 PM UTC-5, agrays...@gmail.com >> wrote: >>> >>> >>> >>> On Friday, April 19, 2019 at 2:53:00

Re: Questions about the Equivalence Principle (EP) and GR

On Sunday, April 21, 2019 at 12:07:07 AM UTC-6, Philip Thrift wrote: > > > > On Saturday, April 20, 2019 at 4:14:27 PM UTC-5, agrays...@gmail.com > wrote: >> >> >> >> On Friday, April 19, 2019 at 2:53:00 AM UTC-6, Bruno Marchal wrote: >>> >>> >>> On 19 Apr 2019, at 04:08, agrays...@gmail.com

Re: Questions about the Equivalence Principle (EP) and GR

On Saturday, April 20, 2019 at 9:51:13 PM UTC-6, Brent wrote: > > > > On 4/20/2019 2:14 PM, agrays...@gmail.com wrote: > > The following (long!) video can also help (well, it did help me) >> >> https://www.youtube.com/watch?v=foRPKAKZWx8 >> >> >> Bruno >> > > *I've been viewing this video. I

Re: Questions about the Equivalence Principle (EP) and GR

On Saturday, April 20, 2019 at 4:14:27 PM UTC-5, agrays...@gmail.com wrote: > > > > On Friday, April 19, 2019 at 2:53:00 AM UTC-6, Bruno Marchal wrote: >> >> >> On 19 Apr 2019, at 04:08, agrays...@gmail.com wrote: >> >> >> >> On Thursday, April 18, 2019 at 6:53:33 PM UTC-6, Brent wrote: >>> >>>

Re: Questions about the Equivalence Principle (EP) and GR

On 4/20/2019 2:14 PM, agrayson2...@gmail.com wrote: The following (long!) video can also help (well, it did help me) https://www.youtube.com/watch?v=foRPKAKZWx8 Bruno *I've been viewing this video. I don't see how he

Re: Questions about the Equivalence Principle (EP) and GR

On Friday, April 19, 2019 at 2:53:00 AM UTC-6, Bruno Marchal wrote: > > > On 19 Apr 2019, at 04:08, agrays...@gmail.com wrote: > > > > On Thursday, April 18, 2019 at 6:53:33 PM UTC-6, Brent wrote: >> >> Sorry, I don't remember what, if anything, I intended to text. >> >> I'm not expert on how

Re: Questions about the Equivalence Principle (EP) and GR

> On 19 Apr 2019, at 04:08, agrayson2...@gmail.com wrote: > > > > On Thursday, April 18, 2019 at 6:53:33 PM UTC-6, Brent wrote: > Sorry, I don't remember what, if anything, I intended to text. > > I'm not expert on how Einstein arrived at his famous field equations. I know > that he

Re: Questions about the Equivalence Principle (EP) and GR

On Thu, Apr 18, 2019 at 09:13:34PM -0700, agrayson2...@gmail.com wrote: > > > On Thursday, April 18, 2019 at 9:20:36 PM UTC-6, agrays...@gmail.com wrote: > > > > On Thursday, April 18, 2019 at 8:08:58 PM UTC-6, agrays...@gmail.com > wrote: > > > > On Thursday, April 18, 2019

Re: Questions about the Equivalence Principle (EP) and GR

On 4/18/2019 8:20 PM, agrayson2...@gmail.com wrote: On Thursday, April 18, 2019 at 8:08:58 PM UTC-6, agrays...@gmail.com wrote: On Thursday, April 18, 2019 at 6:53:33 PM UTC-6, Brent wrote: Sorry, I don't remember what, if anything, I intended to text. I'm not

Re: Questions about the Equivalence Principle (EP) and GR

On Thursday, April 18, 2019 at 9:20:36 PM UTC-6, agrays...@gmail.com wrote: > > > > On Thursday, April 18, 2019 at 8:08:58 PM UTC-6, agrays...@gmail.com > wrote: >> >> >> >> On Thursday, April 18, 2019 at 6:53:33 PM UTC-6, Brent wrote: >>> >>> Sorry, I don't remember what, if anything, I

Re: Questions about the Equivalence Principle (EP) and GR

Very interesting.  Thanks. Brent On 4/18/2019 7:08 PM, agrayson2...@gmail.com wrote: Here's a link which might help; https://arxiv.org/pdf/1608.05752.pdf AG -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group

Re: Questions about the Equivalence Principle (EP) and GR

On Thursday, April 18, 2019 at 8:08:58 PM UTC-6, agrays...@gmail.com wrote: > > > > On Thursday, April 18, 2019 at 6:53:33 PM UTC-6, Brent wrote: >> >> Sorry, I don't remember what, if anything, I intended to text. >> >> I'm not expert on how Einstein arrived at his famous field equations. I

Re: Questions about the Equivalence Principle (EP) and GR

On Thursday, April 18, 2019 at 6:53:33 PM UTC-6, Brent wrote: > > Sorry, I don't remember what, if anything, I intended to text. > > I'm not expert on how Einstein arrived at his famous field equations. I > know that he insisted on them being tensor equations so that they would > have the

Re: Questions about the Equivalence Principle (EP) and GR

ferent. AG That's one possibility, e.g entropic gravity. What is gets you is it enforces and explains the e

Re: Questions about the Equivalence Principle (EP) and GR

ansforming coordinates has the result of putting the test >>>>>>>>>>> particle in >>>>>>>>>>> local free fall, when it wasn't prior to the transformation? AG >>>>>>>>>>> >>>>>>>>

Re: Questions about the Equivalence Principle (EP) and GR

> On 17 Apr 2019, at 01:41, 'Brent Meeker' via Everything List > wrote: > > > > On 4/16/2019 7:56 AM, agrayson2...@gmail.com > wrote: >> >> >> On Monday, April 15, 2019 at 9:26:59 PM UTC-6, Brent wrote: >> >> >> On 4/15/2019 7:14 PM, agrays...@gmail.com

Re: Questions about the Equivalence Principle (EP) and GR

wasn't prior to the transformation? AG >>>>>>>>>> >>>>>>>>>> It doesn't put it in free-fall. If the particle has EM forces on >>>>>>>>>> it, it will deviate from the geodesic in the tangent space >>>>>>>&

Re: Questions about the Equivalence Principle (EP) and GR

forces. Maybe gravity is just different. AG That's one possibility, e.g entropic gravity. What is gets you is it enforces and explains the equivalence

Re: Questions about the Equivalence Principle (EP) and GR

>>>>>>> The transformation is just adapting the coordinates to the local >>>>>>>>> free-fall >>>>>>>>> which removes gravity as a force...but not other forces. >>>>>>>>&g

Re: Questions about the Equivalence Principle (EP) and GR

is just different. AG That's one possibility, e.g entropic gravity. What is gets you is it enforces and explains the equivalence principle.  And of course Einstein's

Re: Questions about the Equivalence Principle (EP) and GR

gt;>>>>> Brent >>>>>>>> >>>>>>> >>>>>>> In both cases, with and without non-gravitational forces acting on >>>>>>> test particle, I assume the trajectory appears identical to an external >>&

Re: Questions about the Equivalence Principle (EP) and GR

. What is gets you is it enforces and explains the equivalence principle.  And of course Einstein's theory also correctly predicted the bending of light, gravitational waves

Re: Questions about the Equivalence Principle (EP) and GR

gt;>>>>> observer, before and after coordinate transformation to the tangent >>>>>> plane >>>>>> at some point; all that's changed are the labels of spacetime points. If >>>>>> this is true, it's still hard to see why changi

Re: Questions about the Equivalence Principle (EP) and GR

On Tuesday, April 16, 2019 at 9:21:32 PM UTC-6, Brent wrote: > > > > On 4/16/2019 6:25 PM, agrays...@gmail.com wrote: > > > > On Tuesday, April 16, 2019 at 5:41:35 PM UTC-6, Brent wrote: >> >> >> >> On 4/16/2019 7:56 AM, agrays...@gmail.com wrote: >> >> >> >> On Monday, April 15, 2019 at

Re: Questions about the Equivalence Principle (EP) and GR

gt;>>>>> observer, before and after coordinate transformation to the tangent >>>>>> plane >>>>>> at some point; all that's changed are the labels of spacetime points. If >>>>>> this is true, it's still hard to see why changi

Re: Questions about the Equivalence Principle (EP) and GR

On 4/16/2019 6:25 PM, agrayson2...@gmail.com wrote: On Tuesday, April 16, 2019 at 5:41:35 PM UTC-6, Brent wrote: On 4/16/2019 7:56 AM, agrays...@gmail.com wrote: On Monday, April 15, 2019 at 9:26:59 PM UTC-6, Brent wrote: On 4/15/2019 7:14 PM, agrays...@gmail.com

Re: Questions about the Equivalence Principle (EP) and GR

with the other forces. Maybe gravity is just different. AG That's one possibility, e.g entropic gravity. What is gets you is it enforces and explains the equivalence principle. And of course Einstein's theory also

Re: Questions about the Equivalence Principle (EP) and GR

On Tuesday, April 16, 2019 at 5:41:35 PM UTC-6, Brent wrote: > > > > On 4/16/2019 7:56 AM, agrays...@gmail.com wrote: > > > > On Monday, April 15, 2019 at 9:26:59 PM UTC-6, Brent wrote: >> >> >> >> On 4/15/2019 7:14 PM, agrays...@gmail.com wrote: >> >> >> >> On Friday, April 12, 2019 at

Re: Questions about the Equivalence Principle (EP) and GR

gt;>>>> gravitational forces. And what does this buy us? AG >>>>> >>>>> >>>>> You're looking at it the wrong way around. There never were any >>>>> gravitational forces, just your choice of coordinate system made >>>

Re: Questions about the Equivalence Principle (EP) and GR

;>> gravitational forces, just your choice of coordinate system made >>>> fictitious >>>> forces appear; just like when you use a merry-go-round as your reference >>>> frame you get coriolis forces. >>>> >>> >>> If g

Re: Questions about the Equivalence Principle (EP) and GR

out the inconsistency of the gravitational force with the other forces. Maybe gravity is just different. AG That's one possibility, e.g entropic gravity. What is gets you is it enforces and explains the equivalence principle.  And of course Einstein's theory

Re: Questions about the Equivalence Principle (EP) and GR

On 4/16/2019 7:56 AM, agrayson2...@gmail.com wrote: On Monday, April 15, 2019 at 9:26:59 PM UTC-6, Brent wrote: On 4/15/2019 7:14 PM, agrays...@gmail.com wrote: On Friday, April 12, 2019 at 5:48:23 AM UTC-6, agrays...@gmail.com wrote: On Thursday, April 11, 2019

Re: Questions about the Equivalence Principle (EP) and GR

> >> >> If gravity is a fictitious force produced by the choice of coordinate >> system, in its absence (due to a change in coordinate system) how does GR >> explain motion? Test particles move on geodesics in the absence of >> non-gravitational forces, b

Re: Questions about the Equivalence Principle (EP) and GR

t why do they move at all? AG >> > > Maybe GR assumes motion but doesn't explain it. AG > > > The sciences do not try to explain, they hardly even try to interpret, > they mainly make models. By a model is meant a mathematical construct > which, with the addition of certain

Re: Questions about the Equivalence Principle (EP) and GR

and explains the equivalence principle.  And of course Einstein's theory also correctly predicted the bending of light, gravitational waves, time dilation and the precession of the perhelion of Mercury. I was referring earlier just

Re: Questions about the Equivalence Principle (EP) and GR

is gets you is it enforces and explains the equivalence principle.  And of course Einstein's theory also correctly predicted the bending of light, gravitational waves, time dilation and the precession of the perhelion of Mercury. I was referring earlier just

Re: Questions about the Equivalence Principle (EP) and GR

were any >>> gravitational forces, just your choice of coordinate system made fictitious >>> forces appear; just like when you use a merry-go-round as your reference >>> frame you get coriolis forces. >>> >> >> If gravity is a fictitious for

Re: Questions about the Equivalence Principle (EP) and GR

rces appear; just like when you use a merry-go-round as your reference >> frame you get coriolis forces. >> > > If gravity is a fictitious force produced by the choice of coordinate > system, in its absence (due to a change in coordinate system) how does GR > explain motion? T

Re: Questions about the Equivalence Principle (EP) and GR

gravity is a fictitious force produced by the choice of coordinate system, in its absence (due to a change in coordinate system) how does GR explain motion? Test particles move on geodesics in the absence of non-gravitational forces, but why do they move at all? AG Another problem is the inconsi

Re: Questions about the Equivalence Principle (EP) and GR

an external > observer, before and after coordinate transformation to the tangent plane > at some point; all that's changed are the labels of spacetime points. If > this is true, it's still hard to see why changing labels can remove the > gravitational forces. And what doe

Re: Questions about the Equivalence Principle (EP) and GR

you get coriolis forces.  What is gets you is it enforces and explains the equivalence principle.  And of course Einstein's theory also correctly predicted the bending of light, gravitational waves, time dilation and the precession of the perhelion of Mercury. Brent -- You received

Re: Questions about the Equivalence Principle (EP) and GR

On Thursday, April 11, 2019 at 7:12:17 PM UTC-6, Brent wrote: > > > > On 4/11/2019 4:53 PM, agrays...@gmail.com wrote: > > > > On Thursday, April 11, 2019 at 4:37:39 PM UTC-6, Brent wrote: >> >> >> >> On 4/11/2019 1:58 PM, agrays...@gmail.com wrote: >> >> >>> He might have been referring

Re: Questions about the Equivalence Principle (EP) and GR

On 4/11/2019 4:53 PM, agrayson2...@gmail.com wrote: On Thursday, April 11, 2019 at 4:37:39 PM UTC-6, Brent wrote: On 4/11/2019 1:58 PM, agrays...@gmail.com wrote: He might have been referring to a transformation to a tangent space where the metric tensor is

Re: Questions about the Equivalence Principle (EP) and GR

On Thursday, April 11, 2019 at 4:37:39 PM UTC-6, Brent wrote: > > > > On 4/11/2019 1:58 PM, agrays...@gmail.com wrote: > > >>> >> He might have been referring to a transformation to a tangent space where >> the metric tensor is diagonalized and its derivative at that point in >> spacetime is

Re: Questions about the Equivalence Principle (EP) and GR

On 4/11/2019 1:58 PM, agrayson2...@gmail.com wrote: He might have been referring to a transformation to a tangent space where the metric tensor is diagonalized and its derivative at that point in spacetime is zero. Does this make any sense? Sort of. Yeah, that's what

Re: Questions about the Equivalence Principle (EP) and GR

;>>>>> In GR, is there a distinction between coordinate systems and frames >>>>>> of reference? AG?? >>>>>> >>>>> >>>>> Here's the problem; there's a GR expert known to some members of this >>>>> list,

Re: Questions about the Equivalence Principle (EP) and GR

possible to find a transformation from the given coordinate system (and using Einstein's Equivalence Principle), to another coordinate system which is locally flat at the arbitrarily given point in space-time. This implies

Re: Questions about the Equivalence Principle (EP) and GR

t;>> >>>>> In GR, is there a distinction between coordinate systems and frames of >>>>> reference? AG?? >>>>> >>>> >>>> Here's the problem; there's a GR expert known to some members of this >>>> list, who claim

Re: Questions about the Equivalence Principle (EP) and GR

an arbitrary coordinate system on a manifold, and any given point in space-time, it's possible to find a transformation from the given coordinate system (and using Einstein's Equivalence Principle), to another coordinate system which is locally flat

Re: Questions about the Equivalence Principle (EP) and GR

gt;>> list, who claims GR does NOT distinguish coordinate systems from frames of >>> reference. He also claims that given an arbitrary coordinate system on a >>> manifold, and any given point in space-time, it's possible to find a >>> transformation from the give

Re: Questions about the Equivalence Principle (EP) and GR

(and using Einstein's Equivalence Principle), to another coordinate system which is locally flat at the arbitrarily given point in space-time. This implies that a test particle is in free fall at that point in space-time. But how can changing labels on space-time

Re: Questions about the Equivalence Principle (EP) and GR

there's a GR expert known to some members of this >> list, who claims GR does NOT distinguish coordinate systems from frames of >> reference. He also claims that given an arbitrary coordinate system on a >> manifold, and any given point in space-time, it's possible to find a &g

Re: Questions about the Equivalence Principle (EP) and GR

on a manifold, and any given point in space-time, it's possible to find a transformation from the given coordinate system (and using Einstein's Equivalence Principle), to another coordinate system which is locally flat at the arbitrarily given point in space-time. This implies

Re: Questions about the Equivalence Principle (EP) and GR

> manifold, and any given point in space-time, it's possible to find a > transformation from the given coordinate system (and using Einstein's > Equivalence Principle), to another coordinate system which is locally flat > at the arbitrarily given point in space-time. This implies that a t

Re: Questions about the Equivalence Principle (EP) and GR

Equivalence Principle), to another coordinate system which is locally flat at the arbitrarily given point in space-time. This implies that a test particle is in free fall at that point in space-time. But how can changing labels on space-time points, change the physical properties of a test particle

Re: Questions about the Equivalence Principle (EP) and GR

h coordinate systems from frames of reference. He also claims that given an arbitrary coordinate system on a manifold, and any given point in space-time, it's possible to find a transformation from the given coordinate system (and using Einstein's Equivalence Principle), to another coordinate

Re: Questions about the Equivalence Principle (EP) and GR

In GR, is there a distinction between coordinate systems and frames of reference? AG -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to

Re: Questions about the Equivalence Principle (EP) and GR

On 3/27/2019 9:34 AM, agrayson2...@gmail.com wrote: Look at the paper by Gupta and Padmanabhan that I linked to. *I looked through your posts here and do not find these papers. Please post the links. I want to spend more time reading relevant articles, than asking questions. AG*

Re: Questions about the Equivalence Principle (EP) and GR

On Tuesday, March 26, 2019 at 5:08:15 PM UTC-6, smitra wrote: > > On 26-03-2019 20:29, agrays...@gmail.com wrote: > > On Tuesday, March 26, 2019 at 11:29:08 AM UTC-6, John Clark wrote: > > > >> On Tue, Mar 26, 2019 at 1:14 PM wrote: > >> > >>> _> How do the mathematicians prove it?_ > >>

Re: Questions about the Equivalence Principle (EP) and GR

On Tuesday, March 26, 2019 at 7:58:11 PM UTC-6, Brent wrote: > > > > On 3/26/2019 12:29 PM, agrays...@gmail.com wrote: > > > > On Tuesday, March 26, 2019 at 11:29:08 AM UTC-6, John Clark wrote: >> >> On Tue, Mar 26, 2019 at 1:14 PM wrote: >> >> *> How do the mathematicians prove it?* >> >> >>

Re: Questions about the Equivalence Principle (EP) and GR

On 3/26/2019 12:29 PM, agrayson2...@gmail.com wrote: On Tuesday, March 26, 2019 at 11:29:08 AM UTC-6, John Clark wrote: On Tue, Mar 26, 2019 at 1:14 PM > wrote: /> How do the mathematicians prove it?/ Mathematicians can't prove that a physical theory is correct, all

Re: Questions about the Equivalence Principle (EP) and GR

On 3/26/2019 6:14 AM, agrayson2...@gmail.com wrote: On Tuesday, March 26, 2019 at 6:28:18 AM UTC-6, John Clark wrote: On Tue, Mar 26, 2019 at 4:40 AM > wrote: >>>Einstein never said everything is relative. Unlike velocity there is such a thing as

Re: Questions about the Equivalence Principle (EP) and GR

On 26-03-2019 20:29, agrayson2...@gmail.com wrote: On Tuesday, March 26, 2019 at 11:29:08 AM UTC-6, John Clark wrote: On Tue, Mar 26, 2019 at 1:14 PM wrote: _> How do the mathematicians prove it?_ Mathematicians can't prove that a physical theory is correct, all they can do is show that

Re: Questions about the Equivalence Principle (EP) and GR

On Tuesday, March 26, 2019 at 11:29:08 AM UTC-6, John Clark wrote: > > On Tue, Mar 26, 2019 at 1:14 PM > wrote: > > *> How do the mathematicians prove it?* > > > Mathematicians can't prove that a physical theory is correct, all they can > do is show that changing the coordinate system (for

Re: Questions about the Equivalence Principle (EP) and GR

On Tue, Mar 26, 2019 at 1:14 PM wrote: *> How do the mathematicians prove it?* Mathematicians can't prove that a physical theory is correct, all they can do is show that changing the coordinate system (for example by rotating the X and Y axis) does not result in different physical predictions.

Re: Questions about the Equivalence Principle (EP) and GR

On Tuesday, March 26, 2019 at 10:36:03 AM UTC-6, John Clark wrote: > > By the way, just 2 weeks ago the best test ever made of Einstein's > Equivalence Principle was performed in a gravitational field one million > times greater than Earth's and Einstein passed the test with flyi

Re: Questions about the Equivalence Principle (EP) and GR

On Tuesday, March 26, 2019 at 9:35:41 AM UTC-6, John Clark wrote: > > On Tue, Mar 26, 2019 at 9:14 AM > wrote: > > *>* *although the field equations are claimed to be the same in all >> frames, accelerating or not, how does one prove that* >> > > Mathematicians prove things Physicists don't.

Re: Questions about the Equivalence Principle (EP) and GR

By the way, just 2 weeks ago the best test ever made of Einstein's Equivalence Principle was performed in a gravitational field one million times greater than Earth's and Einstein passed the test with flying colors. Test of the Einstein Equivalence Principle near the Galactic Center Supermassive

Re: Questions about the Equivalence Principle (EP) and GR

On Tue, Mar 26, 2019 at 9:14 AM wrote: *>* *although the field equations are claimed to be the same in all frames, > accelerating or not, how does one prove that* > Mathematicians prove things Physicists don't. Physicists show that some ideas are less wrong than others and they do that by

Re: Questions about the Equivalence Principle (EP) and GR

On Tuesday, March 26, 2019 at 6:28:18 AM UTC-6, John Clark wrote: > > On Tue, Mar 26, 2019 at 4:40 AM > wrote: > > >>>Einstein never said everything is relative. Unlike velocity there is such a thing as absolute acceleration, if that were not true the Twin Paradox could not be

Re: Questions about the Equivalence Principle (EP) and GR

On Tue, Mar 26, 2019 at 4:40 AM wrote: >>>Einstein never said everything is relative. Unlike velocity there is >>> such a thing as absolute acceleration, if that were not true the Twin >>> Paradox could not be resolved. >>> >> >> *>> But in GR don't the field equations take the same form in all

Re: Questions about the Equivalence Principle (EP) and GR

On Wednesday, March 20, 2019 at 11:13:06 PM UTC-6, agrays...@gmail.com wrote: > > > > On Wednesday, March 20, 2019 at 10:08:53 AM UTC-6, John Clark wrote: >> >> On Wed, Mar 20, 2019 at 9:16 AM wrote: >> >> * > how does GR establish the Principle of Relativity (for accelerating >>> frames)? AG

Re: Questions about the Equivalence Principle (EP) and GR

t; >> LATER GAVE UP ON THIS PROJECT AND SETTLED FOR A THEORY OF GRAVITY. >> >> IS THIS TRUE? TIA, AG >> >> >> >> Einstein's breakthrough, what he called "the happiest thought of my >> >> life" was when he realized a man in a falling

Re: Questions about the Equivalence Principle (EP) and GR

"the happiest thought of my >> life" was when he realized a man in a falling elevator will not feel >> gravity but a man in a accelerating elevator will. In other words an >> accelerating frame and gravity are the same thing, that's why i

Re: Questions about the Equivalence Principle (EP) and GR

On Wednesday, March 20, 2019 at 10:08:53 AM UTC-6, John Clark wrote: > > On Wed, Mar 20, 2019 at 9:16 AM > wrote: > > * > how does GR establish the Principle of Relativity (for accelerating >> frames)? AG * >> > > It doesn't, Einstein never said everything is relative. Unlike velocity > there

Re: Questions about the Equivalence Principle (EP) and GR

of my > >> life" was when he realized a man in a falling elevator will not feel > >> gravity but a man in a accelerating elevator will. In other words an > >> accelerating frame and gravity are the same thing, that's why it's > >> called the Equivale

Re: Questions about the Equivalence Principle (EP) and GR

ought of my life" was when he realized a man in a falling elevator will not feel gravity but a man in a accelerating elevator will. In other words an accelerating frame and gravity are the same thing, that's why it's called the Equivalence Principle. I wonder if Einstein ever considered whether

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