Interferometric detection of gravitational waves: understanding if Einstein\'s General Relativity is the correct and definitive theory of gravity will be Ultimately Possible in Physics by Christian

Christian Corda

Essay Abstract

It is well known that Einstein's General Relativity (GR) achieved a great success and overcame lots of experimental tests. On the other hand, GR also showed some shortcomings and flaws which today advise theorists to ask if it is the definitive theory of gravity. In this essay we show that, if advanced projects on the detection of Gravitational Waves (GWs) will improve their sensitivity, allowing to perform a GWs astronomy, understanding if Einstein's GR is the correct and definitive theory of gravity will be Ultimately Possible in Physics. For this goal, accurate angular and frequency dependent response functions of interferometers for GWs arising from various Theories of Gravity, i.e. GR and Extended Theories of Gravity will have to be used. The papers which found this essay have been the world's most cited in the official Astroparticle Publication Review of ASPERA during the 2007 with 13 citations. This essay is an improved and more detailed version of the one which recently won an Honorable Mention at the the 2009 Gravity Research Foundation Awards

Author Bio

Christian Corda received his Ph.D. degree in physics from the Pisa University, Pisa, Italy during the period from 2003 to 2007. During 2007, he became the world's most cited author in the Official Astroparticle Publication Review of ASPERA, with 13 citations. He is the Editor-in-Chief of "The Open Astronomy Journal" of Bentham Science Publishers and an Editor of "The International Journal of Mathematics and Mathematical Sciences" of Hindawi Publishing Corporation. In addition, Corda is the Scientific Director of the Associazione Scientifica Galileo Galilei, Prato, Italy.

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[deleted]

Please, how can Dr. Corda's assertion be falsified? If it is not falsifiable then is it 'scientific' and, if not, can it be physics?

Christian Corda

Dear Mr. Huffman,

thanks for your interesting question.

My point of view is that only the gravitational waves scientific community could confirm or falsify my assertion. I strongly hope that during next five years a gravitational waves astronomy will be performed. In particular, if my assertion will be falsified, i.e. if gravitational waves signals will be totally different from the ones that we predict at the present time, this could mean that there is something which is deeply wrong in our understanding of the Universe.

Thanks again and best regards,

Ch.

[deleted]

For a perturbation expansion of the Einstein field equation in string theory,

R_{ab} - 1/2Rg_{ab} O(α'R^2) ... = 0

the correction to the classical result should then show up in the third polarization term. Of course this will be a very very weak signal as α'^2 ~ G/c^2, and would be about 10^{-10} smaller than the leading post-post-Newtonian term for a pp-gravity wave.

Over all this looks like a pretty reasonable paper.

Lawrence B. Crowell

Christian Corda

Dear Dr. Crowell,

thank you for your good judgement and for the point that you raised.

I agree with you, the third polarization is present in string theory too. It is a particular case of Scalar-Tensor Gravity.

Thanks again and best regards,

Ch.

[deleted]

I will have a paper up here soon on the role of a quantum phase transition with respect to "braney" dynamics. The quantum critical point has a bearing on Loop Quantum Gravity as well, suggesting a possible tie between string and loops. At any rate, I am going to reread your paper this weekend, which is one of the better ones posted so far, to look at the 3rd polarization. Maybe this can be used to tease data about deeper foundations of the universe.

Cheers LC

[deleted]

The third polarization accounts for information beyond the standard GR derivation for a gravity wave. This could correspond to the Dicke scalar-tensor theory (the scalar being the departure), it could be due to string-M-theory deviations from classical gravity, gauge ambiguities in LQG or some other source. These are smaller than the standard general relativistic result, which is what LIGO and the future LISA are meant to detect. In principle these should be observable, and if some rather exceptional event occurs the 3rd polarization might be detected. This could be something such as the collsion of a large mass with the galactic black hole in the MIlky Way center.

Cheers LC

Steve Dufourny

Hi Dr Corda ,

Very relevant ,it's foundational ,basic ,rational it's the most important I think .

The spherical waves ,the general relativity ....the spheres and their rotations linked by so much constants in the quantum and cosmological dimensions .The reality and its objectivity show us the truths of our Universal dynamic in building .

I learned with your essay ,thanks for that and congratulations for this pragamatism.Sciences need that .

Best regards

Steve

Christian Corda

Dear Lawrence,

thanks for your intersting comments and for appreciating my essay. I am going to read your paper on black holes.

Cheers,

Ch.

[deleted]

Dr Corda ,

What do you think about my quantum spheres ,the cosmological spheres,and the universal sphere in building and their rotations with frequences and rules ?

Regards

Steve

[deleted]

The mass id directly linked with the rotations of quantum spheres ,a big sin velocity implies a weak mass ,simply ,all these rotations of spheres imply all .

It's evident .

Steve

[deleted]

Let's discuss about fundamental and the gravity ,the mass ,the rotations of spheres .If it's possible of course .

Steve

Christian Corda

Dear Steve,

thamks for your good judgement on my essay. Concerning the spheres, I think that they could be fundamental in our Universe. Did you write something on this issue? I discussed an oscillating, spherical Universe in Gen. Rel. Grav. 40:2201-2212,2008. The pre-print is here:

http://lanl.arxiv.org/abs/0802.2523

Thanks again.

Cheers,

Ch.

[deleted]

Dear Dr Corda,You are welcome ,it was with pleasure and with sincerity ,

Thanks for your answer ,it's nice .I liked your essay .

About my theory ,In fact no ,I haven't any certificate ,any paper ,I am too isolated ,I ceased all my studies in Belgian Universitis ,medecine,geology ,agronomy ,horticulture .Even my enterprize was a chaos due to the Belgian system ,I like my country but really it's bizare here for the entrepreneurial mind .

But I continue to class all and I try to link with the spheres in this spherical Universe in building .

At this moment I try to find the number of cosmological spheres,centers of galaxies,stars,planets ,moons ....but my mathematical method is not good it seems to me .I am persuaded that this number is the same in the quantum and linked with the rotation like an universal constant.It's difficult to find this number .But I continue to superimpose some methods .Ray helps me with some ideas but it's not easy .The walls are far of us and it's logic ,the probability is not my force and the computing too .

Thanks for you arxiv link ,I am going to read it .

Best Regards

Steve

Christian Corda

Dear Steve,

my best wishes for your research on the spheres.

If you will write some research paper, I will be pleasured if you will update me.

Cheers,

Ch.

Florin Moldoveanu

Christian,

Thank you for your reply and sorry to get you involved into this matter. By the way, congratulations on a very good essay, I wish you good luck in this contest.

Cheers,

Florin

Christian Corda

Florin,

thanks for your good judgement on my essay, I am going to read your essay.

Good luck to you too!

Cheers,

Ch.

[deleted]

Dr Corda,

Thank you very much ,I will tell you ,I d like write this paper in team in fact .

Best Reagards

ps ,good luck to both of you

Steve

[deleted]

Dear Dr. Corda

Do we have any experimental data that matter emits GWs ?

As far as I know we do not have.

It was measured that neutron double stars speed of rotation is slowing down.

This is not a prove for existence of Gws.

According to my research speed of rotation of neutron stars slows down because matter of the stars is transforming into quanta of space and so diminishing, see article on file attached.

yours amritAttachment #1: 1_4._ATemporal_Gravitation_And_Hypothetical_Gravitational_Waves__EJTP.pdf

Christian Corda

Dear Dr. Sorli,

thanks for your comment.

I am going to read your paper and I will bring back to you with my considerations.

Best regards,

Ch.