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#gravity

2 posts2 participants0 posts today
Public
Mikko Tuomi

Wide binary #stars with separation greater than about 2000 AU are interesting natural laboratories that allow a direct probe of #gravity at low acceleration weaker than about 1 nanometer per second squared.

Now, astrophysicists have developed a new method of measuring gravity with all three components of the velocities (3D velocities) of stars, as a major improvement over existing statistical methods.

For wide binaries whose stars orbit each other with an internal acceleration greater than about 10 nm/s², the inferred gravity is precisely Newtonian, but for an internal acceleration lower than about 1 nm/s² (or separation greater than about 2000 AU), the inferred gravity is about 40% to 50% stronger than Newton.

The significance of the deviation is 4.2-sigma, meaning that standard gravity is outside the 99.997% probability range.

What is striking is that the deviation agrees with the generic prediction of modified gravity theories under the theoretical framework called modified Newtonian dynamics (#MOND), sometimes referred to as Milgromian dynamics.

#astronomy #cosmology
phys.org/news/2025-05-3d-veloc

Phys.org · 3D velocity analysis of wide binaries supports modified gravity at low accelerationBy Sejong University
Public
Mute Dog Brewing

The hoppy IPA-ish beer I brewed (nearly) 2 weeks ago seems to be done fermenting at 1.008 (temp corrected) making it 7.5% abv.

It tastes pretty good, has a nice bitterness on the higher side for my palate but not too painful. Aroma is tropical/pineapple. It definitely needs a dry hop to bring it to where I want it to be, but overall, I think it's turned out well so far. I wish it wasn't as dry as it is, but it's not wrecking the beer by any means.

A close up photo of a hydrometer floating in a sample of beer, showing the Specific Gravity to be 1.006. The reason I wrote 1.008 in my post is because the beer temp was higher (75F) than the calibration temp for the hydrometer (60F) if the beer had been the correct temp the hydrometer would be floating at 1.008
#HomeBrewing#Beer#Gravity
Public
Flipboard Science Desk

Gravity is one of the basic forces of nature that keeps the universe stitched together. Right? But, writes Melvin Vopson, suppose the law of gravity “is simply an echo of something more fundamental: a byproduct of the universe operating under a computer-like code.” It’s a scary thought, but the associate professor of physics explores it in this article for @TheConversationUS:

flip.it/FctFqk

The ConversationCould gravity be evidence that the universe is a computer simulation? My new study suggests why this might be so
More from The Conversation UK
#Science#Space#Universe
Public
💧🌏 Greg Cocks

The Feasibility Of Using LiDAR-Derived Digital Elevation Models [DEMs] For Gravity Data Reduction
--
usgs.gov/3d-elevation-program/ <-- shared article
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pubs.usgs.gov/publication/ofr2 <-- shared report
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“A nice report from our colleagues in the USGS Mineral Resources Program on the feasibility of lidar-derived DEMs, including 3DEP data, for gravity data reduction…”
#GIS #spatial #mapping #3dep #elevation #fedscience #remotesensing #earthobservation #gravity #submetre #accuracy #precision #dGNSS #GNSS #global #navigation #satellite #GPS #LiDAR #DEMs #gravimetrics #milligals #Bouguer #anomaly #monitoring #corrleation #refinement #datareduction #appliedscience #usecases
@USGS

Public
Mikko Tuomi

At long last, a unified theory combining #gravity with the other fundamental forces—electromagnetism and the strong and weak nuclear forces—is within reach.

Bringing gravity into the fold has been the goal of generations of physicists, who have struggled to reconcile the incompatibility of two cornerstones of modern physics: #quantum field theory and Einstein’s theory of gravity.

Researchers at Aalto University have developed a new quantum theory of gravity which describes gravity in a way that’s compatible with the Standard Model of particle physics, opening the door to an improved understanding of how the #universe began.

#physics #cosmology
aalto.fi/en/news/new-theory-of

www.aalto.fiNew theory of gravity brings long-sought Theory of Everything a crucial step closer | Aalto UniversityA quantum theory of gravity would clear the path to answering some of the biggest questions in physics.
Public
Mikko Tuomi

Back in 1915, Einstein put forth his most ambitious idea: the general theory of relativity, combining #gravity with #relativity to create an entirely new conception of our #Universe.

In most conventional circumstances, the predictions of Einstein’s theory are indistinguishable from that of its predecessor: Newton’s law of universal gravitation.

Is it possible, then, to somehow reduce Einstein’s equations down to Newton’s equations?

#physics
bigthink.com/starts-with-a-ban

Big ThinkAsk Ethan: Can we turn Einstein's equations into Newton's law?Einstein's General Relativity has reigned supreme as our theory of gravity for over a century. Could we reduce it back down to Newton's law?
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