If you are one who keeps rotation curves of galaxies in mind, you might enjoy this paper by Yuval Glass, Tomer Zimmerman and Asher Yahalom from 8 Mar 2024. at https://www.mdpi.com/2073-8994/16/4/387. Retarded Gravity in Disk Galaxies When I was using the network of superconducting gravimeters to put narrow bounds on the speed of gravity,
Read More »
Quantum Physicist Reacts to Microsoft Majorana 1 Quantum Chip! at https://www.youtube.com/watch?v=jjho5kWg8fw I will see if I can adapt this approach to make low cost atom interferometer type gravitational sensor arrays to replace or complement those huge old photon based LIGO facilities..Desktop wide bandwidth 3D steerable is more convenient and affordable than km^2 sized rigid sites.
Read More »
https://www.facebook.com/groups/actividadsolar/ For years I have been using Solar Dynamics Observatory AIA and HMI images and movies to look at the sun. Recently I found that solar observers were mostly using H alpha images where those black lines show up. In the AIA 171 Angstrom movies they are clear and much more detailed. And I wonder
Read More »
https://www.facebook.com/reel/1720010422134224 https://x.com/RichardKCollin2/status/1843388114640699822 My Comments: With low cost 3 axis time of flight gravimeter arrays one can have gravitational GPS and compass, and 3D gravity imaging When you calculate the vector acceleration of the sun at a superconducting gravimeter station on earth, you have to use the position of the sun for the time when the
Read More »
Anton Petrov: Evidence of a Donut Like Structure Hidden Inside Planet Earth at https://www.youtube.com/watch?v=GljciCwOfyc Gravitational imaging arrays using low cost but very sensitive gravitational sensors can use time of flight correlation to image regions anywhere inside the earth at high resolution. There are many desktop, even portable alternatives. Atomic clocks, gravity gradiometers, many kinds of
Read More »
Postholer – GIS Resources @postholer Revolutionary Quantum Compass Could Soon Make GPS-Free Navigation a Reality Revolutionary Quantum Compass Could Soon Make GPS-Free Navigation a Reality Replying to @postholer Is an atom interferometer something to look at? Yes, but this one is not sensitive enough or fast enough. Too many cooks. Too expensive R&D overhead. I
Read More »
I was reviewing the life of Hans Otto Meyer who started out at Basel University, spent most of his career at Indiana University in Physics. I found him looking at photomultipliers as I was searching for calibration data on Hamamatsu detectors. Any experiments that run continuously and precisely will run into gravitational potential effects. So
Read More »
Yijun Jiang, Thank you, this comes at a good time. I was reviewing all the technologies that can replace LIGO with atom interferometer and other technologies. Some of them are not very mature yet or the groups have not put in a lot of effort to look at black holes. But there are lots of
Read More »
Diamagnetic magnetic levitation at nanoscale is one way to make chip scale gravimeters. A “gravimeter” is an accelerometer that can track the sun and moon by their gravitational fields precisely. https://arxiv.org/abs/2105.13555 The three axis signal allows “gravitational GPS/GNSS” and “gravitational compass” in 3D. Array for imaging atmospheres, oceans, magma and interiors of things. After
Read More »
https://en.wikipedia.org/wiki/Modified_Newtonian_dynamics Their a0 is 1.2E-10 meter/second^2 which is the sensitivity needed to follow the sun moon tidal gravity signal at the earth’s surface. Potential changes at the sun and moon (and on earth) “diffuse” at the speed of light and change the local gradients. Also, electrons and protons from suns – a few charges easily
Read More »