Free scientific jounal access online thru june

[EWright]

Normally it costs quite a bit to access online journals, so I thought I'd point out that Springer is granting free online access through the end of the month. Many of you with questions about astronomy and such may find some interesting information at http://www.springer.com/west/home/physics/astronomy?SGWID=4-10101-12-153948-0

[UncleAl]

There are simply no physical properties of light that cause clocks of faster moving objects to run slower. Therefore, the notion of the speed of light as a determining factor as to why this happens is irrelevant and must be reconsidered.

Lorentz Invariance and causal reality. You won't find a more powerful argument anywhere. Given any achievable velocities V1 and V2 and any finite lightspeed, the bound on the relative velocities of V1 and V2 as viewed by any inertial observer cannot exceed

 

(V1 + V2)/[1 +(V1)(V2)/c^2]

 

This is transformation of velocities parallel to the direction of motion. For velocities at an arbitrary angle theta, Jackson gives

 

u_parallel = (u'_parallel + v)/(1+(v dot u')/c^2)

u_perp = u'_perp/(gamma_v(1+(v dot u')/c^2))

 

The clock that travels through the most space records the least time elapsed. The metric s^2 is conserved. If you don't like that, tell GPS its relativistic corrections are not needed,

 

http://tycho.usno.navy.mil/ptti/ptti2002/paper20.pdf

Nature 425 374 (2003)

http://www.eftaylor.com/pub/projecta.pdf

http://www.public.asu.edu/~rjjacob/Lecture16.pdf

http://relativity.livingreviews.org/Articles/lrr-2003-1/index.html

Relativity in the GPS system

[EWright]

Lorentz Invariance and causal reality. You won't find a more powerful argument anywhere. Given any achievable velocities V1 and V2 and any finite lightspeed, the bound on the relative velocities of V1 and V2 as viewed by any inertial observer cannot exceed

 

(V1 + V2)/[1 +(V1)(V2)/c^2]

 

This is transformation of velocities parallel to the direction of motion. For velocities at an arbitrary angle theta, Jackson gives

 

u_parallel = (u'_parallel + v)/(1+(v dot u')/c^2)

u_perp = u'_perp/(gamma_v(1+(v dot u')/c^2))

 

The clock that travels through the most space records the least time elapsed. The metric s^2 is conserved. If you don't like that, tell GPS its relativistic corrections are not needed,

 

http://tycho.usno.navy.mil/ptti/ptti2002/paper20.pdf

Nature 425 374 (2003)

http://www.eftaylor.com/pub/projecta.pdf

http://www.public.asu.edu/~rjjacob/Lecture16.pdf

http://relativity.livingreviews.org/Articles/lrr-2003-1/index.html

Relativity in the GPS system

 

Actually, Al, I do agree with you that the clock that travels through the most space records the least time. I'm just saying that light, as a physical property, does not cause it.

[Tormod]

Normally it costs quite a bit to access online journals, so I thought I'd point out that Springer is granting free online access through the end of the month.

 

I was unable to find any information about this on their website.

 

However, I can recommend the Public Library of Science:

 

http://www.plos.org/

 

It is free and non-profit.

[EWright]

Odd, I don't see it there now either, but they did have the statement on a few different pages the day I posted this. Thanks for the link to the PLoS, it seems interesting and I'll be sure to check it out.

[Celeste]

Nice site. Thanks Tormod. :)

[Eclogite]

For detailed technical discussions on astronomy I invariably use the NASA Astronomical Data System (ADS). Abstracts from all the major journals relating to astronomy and physics, and many of the minor ones, as well as conference reports, are to be found there. Moreover, in a substantial number of cases the original article is available in full, not just the abstract. (In my own experience over 80% of those I would like a closer look at are so available.).

 

You can access the site here:

http://adsabs.harvard.edu/ads_abstracts.html

 

 

For papers on the other sciences I search at PubMed, maintained by the National Library of Medicine and the National Institute of Health. Although medical and biological items predominate, there is still susbtantial material to be found in sciences such as geology.

Abstracts are present for most documents, and in some instances the full paper is also accessible free.

 

You can access the site here:

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed

 

 

The Proceedings of the National Academy of Sciences are available free, back to their inauguration in 1913, and to within six months of the current issue.

 

http://www.pnas.org

 

or, for faster connection outside the US

 

http://intl.pnas.org