#CosmologicalConstant
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philosophie.bsky.social
A grounding fine-tuning is a fine-tuning that serves as a necessary condition for other things.

An example of a grounding fine-tuning is the cosmological constant.
It grounds our singleverse and everything within it.

#FineTuning #CosmologicalConstant #Philosophy
January 25, 2025 at 12:28 AM
electricbluesfan.bsky.social
6/9 Since dark energy's discovery, scientists believed it functions like Einstein's "cosmological constant"—a repulsive force he called his "biggest blunder" but which quantum theory supports. If constant, it dooms us to an ever-accelerating, lonely universe.
#Einstein #CosmologicalConstant #Physics
March 20, 2025 at 7:20 AM
gravitygrinch.bsky.social
#HappyBirthday, you #CosmologicalConstant, whatever you are!
Indeed, this paper is one of the rare cases in which #Einstein wrote about cosmology and it's a wonderful example of his pioneering and audacious thinking (he also introduces what will later be the Cosmological Principle in this work!).
mcnees.bsky.social Robert McNees @mcnees.bsky.social · Feb 8
Happy birthday, Λ!

Einstein submitted "Cosmological Considerations in the General Theory of Relativity" to the Prussian Academy #OTD in 1917.

It marked the birth of relativistic cosmology and added a "cosmological constant" term to the field equations of general relativity. 🧪 ⚛️ 🔭
Cosmological Considerations in the General Theory of Relativity Cosmological Considerations in the General Theory of Relativity is well known that Poisson's equation V2£ = 4ttKp . . . . (1) in combination with the equations of motion of a material point is not as yet a perfect substitute for Newton's theory of action at a distance. There is still to be taken into account the condition that at spatial infinity the potential Q tends toward a fixed limiting value. There is an analogous state of things in the theory of gravitation in general relativity. Here, too, we must supplement the differential equations by limiting conditions at spatial infinity, if we really have to regard the universe as being of infinite spatial extent. [2] In my treatment of the planetary problem I chose these limiting conditions in the form of the following assumption: it is possible to select a system of reference so that at spatial infinity all the gravitational potentials guv become constant. [3] But it is by no means evident a priori that we may lay down the same limiting conditions when we wish to take larger portions of the physical universe into consideration. In the following pages the reflexions will be given which, up to the present, I have made on this fundamentally important question. However, the system of equations (14) allows a readily suggested extension which is compatible with the relativity postulate, and is perfectly analogous to the extension of Poisson's equation given by equation (2). For on the left-hand side of field equation (13) we may add the fundamental tensor ww, multiplied by a universal constant, - r, at present unknown, without destroying the general covariance. In place of field equation (13) we write Guy - 2gur = - K(Tur - ‡garT) . . (13a) This field equation, with ~ suffciently small, is in any case also compatible with the facts of experience derived from the solar system. It also satisfies laws of conservation of momentum and energy, because we arrive at (13a) in place of (13) by introducing into Hamilton's principle, instead of the scalar of Riemann's tensor, this scalar increased by a
February 9, 2025 at 9:38 AM
kill-bait.bsky.social
Einstein’s Cosmological Constant Resurfaces as Key to Understanding Cosmic Expansion

🤖 IA: It's clickbait ⚠️
👥 Users: It's clickbait ⚠️

#cosmologicalconstant #darkenergy #lcdmmodel

View full AI summary:
Einstein’s Cosmological Constant Resurfaces as Key to Understanding Cosmic Expansion
A century after Albert Einstein introduced the cosmological constant to stabilize his equations of general relativity, astronomers have revived this concept to explain the universe's accelerating expansion. Initially dismissed by Einstein as his 'greatest blunder,' the cosmological constant—now known as dark energy—has become central to the Lambda Cold Dark Matter (LCDM) model, which describes cosmic evolution since the Big Bang. Observations in 1998 revealed that the universe is not slowing down but speeding up, contradicting earlier assumptions about matter's gravitational influence. This discovery forced cosmologists to rework their Standard Model of Cosmology, replacing it with LCDM, which incorporates dark energy (Lambda) and cold dark matter (CDM). Despite its remarkable success in explaining phenomena like cosmic microwave background radiation and large-scale structure formation, the model remains incomplete, hinting at deeper mysteries about the universe's fate. The article traces Einstein's original theoretical struggles, the 20th-century shift toward an expanding universe, and the modern resurgence of his abandoned idea as a cornerstone of contemporary cosmology.
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August 19, 2026 at 9:01 AM
longtail-news.bsky.social
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By: CosmologicalConstant on Friday, December 12, 2025
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December 13, 2025 at 4:04 AM
longtail-news.bsky.social
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By: CosmologicalConstant on Wednesday, June 4, 2025
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June 4, 2025 at 3:04 PM
longtail-news.bsky.social
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By: CosmologicalConstant on Wednesday, May 28, 2025
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May 28, 2025 at 1:16 PM
astronomybot.bsky.social
...efs. #astronomy #history #einstein #generalrelativity #cosmology #cosmologicalconstant #expandinguniverse
November 24, 2024 at 3:00 PM
electricbluesfan.bsky.social
10/12 The controversy involves parameter w(z), representing dark energy's pressure-to-density ratio. When w(z) equals -1, it matches Einstein's cosmological constant. Values below -1 could doom the universe to tear itself apart.
#EinsteinPhysics #CosmologicalConstant
May 3, 2025 at 6:18 AM
informaq.bsky.social
Unified quantum gravity framework linking spacetime emergence to quantum information via de Sitter entropy. Shows how holographic principles and symmetry breaking naturally stabilize the remarkably small cosmological constant value.

#QuantumGravity #CosmologicalConstant #Research
Holographic Naturalness and Pre-Geometric Gravity
iq.fp2.dev
April 30, 2026 at 8:44 AM
thejameshutchison.bsky.social
Another preview from The Modest Theory

#physics #science #theoryofeverything #themodesttheory #relativity #einstein #time #cosmologicalconstant
Symmetry Many theories built around symmetry break down, and the fractal pattern explains why. A dominate field will take over. If anything, the Universe functions because of asymmetry and because pressure imbalances cannot reconcile. Time One question I've had is whether time is even a thing in "spacetime". I believe Einstein coined the phrase because he believed there should be a "wind" in the "ether", and the fact that light was the same speed in all directions had him believe time was a component to it. However, looking at how all observations fit together, I do not see how time must be included. It would appear that relativistic effects align with change in pressure. When one considers that we experience time as very tiny rotations of energy that move at the speed of light (which itself has only been measured from the reference frame it is ejected from), then time behavior is just tied to field behavior (and is where the time dilation equations were derived from). Quite simply, energy that is moving at the speed of a field cannot orbit other energy also moving at the same speed. When both move slower, they can perform tighter, faster orbits. This aligns with time dilation, and I don't believe I'm suggesting anything novel here. Cosmological Constant Since pressure, structure, etc are all emergent behaviors, there's no true constants. Knowing this, the fact that we cannot agree on a cosmological constant seems obvious, as its just a construct of a formula that will vary...
August 4, 2025 at 12:56 AM
gravitygrinch.bsky.social
#Waiting4WinterSolstice Part 3! Today I want to share another #astro #scicomm talk I liked very much, this time about how to constrain the #CosmologicalConstant from #LocalGroup dynamics. Enjoy: youtu.be/Kt3bCFxhxLo?...
AAS Journal Author Series: David Benisty on 2023ApJ...953L...2B
YouTube video by AAS
youtu.be
December 3, 2024 at 11:45 AM
robinoflocksley.bsky.social
There is something wrong with #CosmologicalModels as something is off with the #CosmologicalConstant

Never did like it and predicted it would go 'south for the winter' one day

Discovered when studying #DarkEnergy via #DESI

youtu.be/ZvL5HHn7DAk?...
DESI Observations Confirm Possible New Physics in Cosmology
YouTube video by Anton Petrov
youtu.be
March 27, 2025 at 12:50 AM
purescience.news
Is Einstein’s “Cosmological Constant” Wrong? New Data Suggests Dark Energy Is Evolving #Science #Space #Cosmology #DarkEnergy #Einstein #CosmologicalConstant
Is Einstein’s “Cosmological Constant” Wrong? New Data Suggests Dark Energy Is Evolving
Astrophysicists at the University of Chicago have developed physics-based models suggesting that dark energy could be changing over time. Dark energy, the mysterious force causing the universe to expand...
purescience.news
October 28, 2025 at 6:00 PM