Johan K. Fremerey

KAGRA's sensitivity has indeed improved significantly, allowing it to detect even fainter gravitational waves. The key advancements have come from enhancing the interferometer's technology, such as cryogenic cooling of the mirrors, which reduces thermal noise. With these improvements, KAGRA's threshold sensitivity has seen a two-order-of-magnitude enhancement, meaning it can detect gravitational waves from more distant or weaker cosmic events, such as mergers of smaller black holes or neutron stars that would have been undetectable before.

This improvement is crucial for expanding our understanding of the universe, as better sensitivity increases the range and number of detectable events, offering deeper insights into gravitational wave sources and their distribution across the cosmos. It also complements other observatories like LIGO and Virgo, creating a global network capable of more precise triangulation and analysis of these cosmic events.

Sandeep Jaiswal : "KAGRA's sensitivity has indeed improved significantly"

Please note that LIGO/Virgo/KAGRA gravitatinal wave network specifies KAGRA detection range at 1-3 Mps by 2024 while LIGO is rated at 150-160+ Mpc.

https://gcn.nasa.gov/missions/lvk

Thank you Johan K. Fremerey, for your follow-up and clarifications. It's evident that KAGRA's improvements represent a significant step forward in gravitational wave detection, especially in terms of sensitivity. While it may be difficult to quantify certain advancements in practice, the leap in theoretical thresholds highlights the importance of ongoing precision adjustments and calibration in enhancing detection capabilities. Ultimately, what stands out is how these refined methodologies pave the way for even more groundbreaking discoveries in astrophysics. It’s been a productive exchange, and I look forward to seeing how KAGRA continues to push the boundaries of our understanding.

Sandeep Jaiswal : "It's evident that KAGRA's improvements represent a significant step forward in gravitational wave detection, especially in terms of sensitivity."

When KAGRA has been unable to reproduce LIGO type signals, how does this fit to its better sensitivity.

Dear Johan K. Fremerey ,

This morning I answered your question first. It seems that the reply was not sent due to my carelessness.

That's about all it contained:

This whole LIGO gravitational wave narrative is a huge hoax. I have been four weeks in China, came back yesterday (2024.10.13). There were opportunities to perform simple experiments that could be used to prove that the prediction of the my theory of gravity gives a positive result.

and quoted the wise remark of the late W.W. Engelhardt from:

https://www.researchgate.net/post/Am_I_the_only_one_that_is_doubtful_of_LIGOs_detection_of_gravitational_wave_GW150914

'I am missing much more:

How do they manage to keep the amplitudes of the interfering beams exactly equal within a factor 10-12?

How do they manage to reduce the stray light in the dark field by a factor of 10-24 compared to the bright field?

How do they keep the circulating power constant within a factor 10-12 in order to avoid motions of the mirrors induced by fluctuating radiation pressure?

Where is the calibration curve showing displacement of the mirrors as a function of the radiation pressure? (10-18 m displacement are caused by 10-7 W light power during .2 s)

How do they know that the velocity of light is unaffected when "spacetime" is "compressed"?'

Regards,

Laszlo

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