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Dark energy is a mysterious force that pushes galaxies in the Universe apart faster and faster, like wind blowing balloons apart. We don't see it, but we know it exists because the Universe is expanding at an accelerating rate.

History

In 1998, two independent groups of astronomers, observing type Ia supernovae, discovered that the Universe is expanding with acceleration. This came as a shock: it was expected that gravity slows down expansion. The discovery brought the Nobel Prize, and the phenomenon itself was called dark energy — in honor of its invisible and mysterious nature.

How it works

Dark energy acts like antigravity: it creates negative pressure that pushes space apart. The simplest option is the cosmological constant, proposed by Einstein, which can be imagined as the energy of the vacuum itself. But where it comes from and why there is so much of it is still a mystery.

💡 Dark energy makes up about 68% of all energy in the Universe — it's as if in a huge pie, almost three-quarters were made of invisible, intangible jelly!
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Edwin HubbleGeorges LemaîtreStephen Hawking
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baryon acoustic oscillationsbig bangcosmological constantdark matterexpansion of the universegravityinflationlarge-scale structure of the universe
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arXiv:2606.05352v2 · 2026-06-03

The Cosmic Metronome Falls Out of Rhythm: Dark Energy Rewrites Hubble's Symphony

The DESI instrument, mapping millions of galaxies, has picked up signs of dark energy evolution. This discovery rewrites the rules for measuring the Universe's expansion rate: the local Hubble constant might drop by several km/s/Mpc. The drama of the Hubble tension — the discrepancy between the earl
arXiv:2606.05358v1 · 2026-06-03

Gravitational Phantoms: Domain Walls Instead of Black Holes

The recent short gravitational-wave transients GW190521 and GW231123 have caused puzzlement: their parameters — extreme masses and spins — challenge the standard black hole merger scenarios. Scientists tested an exotic hypothesis: perhaps these bursts are not generated by cosmic catastrophes, but by
arXiv:2606.06478v1 · 2026-06-04

Dark Start: How Vacuum Decay Birthed the Big Bang

Imagine: after inflation, the Universe didn't ignite right away — it plunged into darkness. Nearly all the energy went into a dark sector, while ordinary matter got stuck in a false vacuum — a supercooled state, like liquid glass on the verge of crystallizing. Then a quantum nudge spawned bubbles of
arXiv:2606.06587v1 · 2026-06-04

The Dusty Truth: Why Supernovae Finally Spoke with One Voice

An international team led by Marco Giunto analyzed nearly a thousand Type Ia supernovae from the ZTF survey and showed that the differences in their color and brightness are almost entirely caused by dust in their host galaxies, not by the physics of the explosions themselves. This settles a long-st
arXiv:2606.06593v1 · 2026-06-04

Dark Matter's Invisible Sparks: Tiny Black Holes as Stellar Detonators

What if dark matter isn’t just passive, but can actually ignite stars? New research simulates white dwarf explosions triggered by the passage of a primordial black hole—a candidate for dark matter. Hydrodynamic simulations and nucleosynthesis calculations of 495 isotopes show that such Type Ia super
arXiv:2606.07505v2 · 2026-06-05

Dark Energy: From Brake to Engine

The Ph-ΛsCDM model describes the behavior of a special field that smoothly transitions from an attractive to a repulsive force. This resolves contradictions between different measurements of the expansion rate and predicts a stable future without the 'Big Rip'.
arXiv:2606.11062 · 2026-06-09

Quantum Trick Accelerates the Universe Without Dark Energy

The universe is expanding at an accelerating rate. Usually this is blamed on dark energy. But a new explanation is post-selection, a quantum trick where the future selects scenarios that suit it. This removes the mystery and explains why the acceleration started just now.
arXiv:2606.12297 · 2026-06-10

Dark Matter Decays and Slows the Universe's Growth

Galaxy clusters in recent epochs have been growing more slowly than expected. The culprit could be dark matter decaying into lightweight particles that create a cosmic 'wind,' hindering clumping. This new model leaves a telltale signature that future sky surveys could detect.
arXiv:2606.12521 · 2026-06-10

Early dark energy reconciles the different ‘thermometers’ of the Universe

Astronomers added a short-lived dark energy to the standard model, which appeared right after the Big Bang. This idea reconciled two methods of measuring cosmic expansion that previously gave different speeds—like two different thermometers. This approach strengthens the model without a major overha
arXiv:2606.19090 · 2026-06-17

Dark bubble and microcosm: gravity at millionths of a meter

The 'dark bubble' model explains why the Universe is expanding faster and faster. It suggests a hidden dimension about a micron thick. At such distances, gravity should weaken dramatically, linking the microcosm to cosmology and providing testable predictions.
arXiv:2606.20942 · 2026-06-18

The Universe Isn't Getting Younger: Ancient Stars Rule Out "Early" Solutions

Astronomers led by Indranil Banik analyzed 155,600 subgiants from the LAMOST and Gaia catalogs. Bayesian age reconstruction revealed the oldest star at 13.73 billion years. Adding 0.2 billion years for the formation of the first stars gives a Universe age of about 13.93 billion years—a perfect match
arXiv:2607.00764v1 · 2026-07-01

The Hourglass of an Ancient Galaxy: JWST Spots Maturity That Arrived Too Soon

Analysis of images from JWST and Hubble with NIRSpec spectroscopy has revealed details of a distant disk galaxy at z=0.92. Multi-component modeling showed that an X-shaped bulge 4.5 kpc long and a bar of about 12 kpc were already present when the Universe was only 6.2 billion years old. A total stel
arXiv:2607.00982v1 · 2026-07-01

Mirror Labyrinth of Dark Energy: How Galactic Twins Refract Cosmology

In pursuit of elusive dark energy, scientists have found a workaround: using pairs of independent gravitational lenses with nearly identical deflectors. Simulations for the LSST survey show that such 'pseudo-double' systems allow measuring the cosmological equation of state with unprecedented statis
arXiv:2607.01005v1 · 2026-07-01

A Universe Without Funhouse Mirrors: How a Ruler Error Spawned Cosmic Monsters

Recent sensational claims of giant inhomogeneities in galaxy distribution, supposedly contradicting the standard model, turned out to be due to a systematic error. Comparing DESI survey data with the FLAMINGO simulation showed that, when properly converting redshifts to distances, the observed large
arXiv:2607.01172v1 · 2026-07-01

Dark Energy: When the Constant Stops Being Constant

A team of astrophysicists conducted a systematic examination of extensions to the standard ΛCDM cosmological model, using data from telescopes like Planck, DESI, Pantheon+, and others. They added dynamic dark energy, spatial curvature, massive neutrinos, and additional inflationary parameters. It tu
arXiv:2607.01226v1 · 2026-07-01

Cosmic Symphony: How the Bass and Whistle of Primordial Black Holes Sound in Unison

The formation of primordial black holes requires extreme amplification of primordial curvature perturbations, which generates two types of gravitational waves: a low-frequency background (SIGW) from the perturbations themselves and a high-frequency signal from the mergers of the resulting binary sys
arXiv:2607.01818v1 · 2026-07-02

Gravitational Atoms: When Boson Stars Break the Laws of Energy

Physicists investigated boson stars in teleparallel gravity, where a scalar field is non-minimally coupled to spacetime torsion. It turned out that excited states of these objects can have negative energy density, violating all four classical energy conditions. The compactness of these stars exceeds
arXiv:2607.02017v1 · 2026-07-02

Polar Vision: How to Unfold a Gravitational Lens and Find Traces of Dark Matter

The hunt for dark matter demands the ability to read the subtlest distortions of light. In a new study, astrophysicists transformed the curved arcs of gravitational lenses into straight lines using a polar transform — and the neural network started noticing previously invisible subhalos. On simulate
arXiv:2607.02663v1 · 2026-07-02

Cosmic Lightning: How Fast Radio Bursts Illuminate Hidden Baryons

Analysis of 3455 fast radio bursts from the CHIME telescope has mapped electron density fluctuations in the cosmic web. The statistically significant signal at >3σ confirms that residual dispersion measures are not random, but reflect real baryon clumping. The method, which does not require precise
arXiv:2607.04106v1 · 2026-07-05

Flattened Darkness: Stellar Streams Outline Invisible Halos

Using the STRRINGS catalog of 32 stellar streams, astronomers have for the first time measured the population distribution of dark matter halo shapes beyond the Local Group. Applying Bayesian analysis, they found that for the 17 most reliable streams, the median flattening is about 0.72 — meaning th
arXiv:2607.05510v1 · 2026-07-06

Cosmic Tuning Fork: KLT-Net Neural Network Rewrites the Distance Ladder

Using 1701 Type Ia supernovae, the KLT-Net neural network reconstructs distance modulus for the first time without relying on cosmological models. The harmony of three architectures—KAN, LSTM, and Transformer—captures both local nuances and the global rhythm of expansion. The result: Hubble constant
arXiv:2607.06959 · 2026-07-08

Anchor in the Shallows: Why DESI Data Misses the Universe's Acceleration

Is the Universe accelerating its expansion—or not? The latest DESI survey, combined with Planck cosmic microwave background data, yields no clear answer for the current epoch, unlike older SDSS data. Researchers have shown that the root of the discrepancy is DESI's lack of measurements at low redshi
arXiv:2607.07348 · 2026-07-08

Dark Energy's Seesaw: A New Explanation for a Strange Signal

The mysterious force accelerating the universe turns out to be fickle. In a new model, dark energy is like steam that partially condenses into 'droplets' when cooled. Massive galaxy clusters act as refrigerators, their gravity creating pressure differences. This solves recent anomalies in supernova
arXiv:2607.08120 · 2026-07-09