Comments on 2Physics: "Changing Constants, Dark Energy and the Absorptio...

Hi Francois -

We submitted a paper proposin...

2007-11-05T22:00:00.000-08:00

Hi Francois -

We submitted a paper proposing a test of string theory based on 21cm radiation... Watch my home page (http://cosmos.astro.uiuc.edu) for an update.

Ben

Prof. Wandelt, if you do not wish to keep it a sec...

2007-08-01T22:25:00.000-07:00

Prof. Wandelt, if you do not wish to keep it a secret until your next publication, may we know what the current activities of yours and your team are to follow up this idea?

I visited your homepage but couldn't guess it.

I'm a graduate student from TIFR, India.. just sta...

2007-08-01T20:38:00.000-07:00

I'm a graduate student from TIFR, India.. just starting... Not yet decided on a problem.

This article was very motivating for a rookie like me. It would be great if scientists like you write more of such articles.

First of all, thank you for your very encouraging ...

2007-08-01T16:04:00.000-07:00

First of all, thank you for your very encouraging comments so far! I would like to reply to a few of the questions and points made here.

"Anonymous" asked about the technological hurdles I mentioned. There are several: First, because these waves have very long wavelengths (several meters), one needs very widely spaced antennas. Then, the antennas need to cover enough area to receive

It would have been great if Prof. Wandelt had elab...

2007-07-30T22:01:00.000-07:00

It would have been great if Prof. Wandelt had elaborated on the 'technological hurdles' that he foresees.

I could not fully agree with his view on the advantages of Laboratory experiments. It's not safe to say that 'the setup is under complete control and repeatable'. The recent failure of PVLAS experiment to reproduce the result that had confirmed earlier the existence of Axions somehow

Interesting article. Somehow missed it in PRL.
2007-07-29T20:32:00.000-07:00
Interesting article. Somehow missed it in PRL.

Good ideas for a Laboratory experiment that can shed light on any aspect of cosmology is so hard to come by that we must give a serious look at this.

Would like to read updates on further work.

Thanks to Prof. Wandelt for this nice account of t...

2007-07-26T22:34:00.000-07:00

Thanks to Prof. Wandelt for this nice account of the work. I read the PRL paper earlier and did not understand lot of things but I knew that the idea was simple and so must be great.

Now, I can use this article to give a journal club talk on the PRL paper.

This is certainly a clever idea but finally it wou...

2007-07-26T11:51:00.000-07:00

This is certainly a clever idea but finally it would depend on how carefully one can take into account all astrophysical factors. The work that comes to my mind is of Joe Taylor's (1993 Nobel) painstakingly-done analysis of Hulse-Taylor pulsar over ten years to finally conclude the evidence of gravitational waves. Somehow I guess this work would also demand a rogorous analysis.

... But