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LIGO_casebook

ADHIKARI: No. The

ADHIKARI: No. The detailed agreement between two wiggles can confirm multiple conjectures. The scientific establishment and the Nobel Prize givers do not have any problems with this. VERITAS: And is this agreement pristine in the sense that you remove the noise and out pops a wiggle that then matches one of your theory wiggles? ADHIKARI: Actually this is a guided agreement in the sense that we window our theory templates through the data string and look for matches. VERITAS: And you still think this agreement satisfactory confirms – jointly and singly – all four independent conjectures, none of which has any other support in the LIGO operation? ADHIKARI: Yes. VERITAS: Is it correct then to say that the LIGO instrument is validated by the discovery it makes, and only by the discovery it makes? ADHIKARI: In a way. VERITAS: And you do not see any logical problem with this scientific procedure? ADHIKARI: No. It is not possible to test LIGO on any kind of standardized source. We do not have any other options. VERITAS: Now, Professor Adhikari, the noise from Class A Operation and the signal from Class B Operation – when they appear together in the LIGO readout, they are superimposed on each other in the sense that you can separate one from the other. Is that correct? ADHIKARI: Yes, but the separating is a complex digital procedure. VERITAS: I want to clarify my question. The wiggle that you obtain after separating from the noise is the same wiggle that would appear in the readout if there were no noise at all? ADHIKARI: Yes. VERITAS: And that is the wiggle that was incident on LIGO and is to be matched to the black hole merger model wiggle? ADHIKARI: Yes. But the matching is more or less already done because we have used the theory wiggle template to match and extract out the signal wiggle. VERITAS: So is it correct to say that Class A and Class B Operations are independent of each other? ADHIKARI: Yes. 74

VERITAS: Professor Adhikari, listen to me closely. This is very important. Consider an instant of time in which a gravitational wave is being recorded by LIGO. At that instant, the laser link is misaligned or a mirror is tilted due to the Class A Operation. So the LIGO instrument at that instant is in a changed configuration. And it is that changed LIGO that is registering the gravitational wave at that instant. This means that Class A Operation not only adds noise but actually distorts the Class B signal. The noise and the signal are not additive. They become inextricable. This is no longer an issue of separating egg yolk from egg white. The egg is scrambled. Do you understand my point? ADHIKARI: I am not sure. I think I am being trapped. VERITAS: Professor Adhikari, this is a court of law and no one is trapping you. I am not schmoozing with you. I have asked you a question. Answer it please. ADHIKARI: What you say sounds right but the real issue is if it is of any significance. VERITAS: Do you know for a fact that this is not significant? ADHIKARI: No. VERITAS: Since noise is dominant in LIGO, common sense tells us that this effect is important. LIGO is an unconventional scientific instrument not because it is novel but because it is weird. But the bottom line is that LIGO readout contains signal and noise completely scrambled and cannot be separated. That is the LIGO weirdorama. Do you agree? ADHIKARI: I cannot answer that question right off the bat. I would have to think about it. VERITAS: Professor Adhikari, how long is your laser link that undergoes jitter – if we can use that term for misalignment etc. – to produce Class A noise? ADHIKARI: It is 4 km on each side of the LIGO ell for the two US stations. VERITAS: I will rephrase my question. How long is the effective laser link? ADHIKARI: I am sorry. I spoke too soon. The effective link is 1200 km because of the light storage technique we use to accumulate measurements. VERITAS: So the Class B signal undergoes 1200 km of link jitter that has been created by Class A Operation. Have you studied the importance of this instrumental signal distortion? ADHIKARI: I have not. But someone else may have. VERITAS: But it is clear that LIGO does not take into account the instrumental distortion of the Class B signal due to Class A Operation. Is that correct? ADHIKARI: We have not addressed this in an explicit way. 75

Talk (PDF) - Physics Department - Utah State University
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