I wonder how precise our current figures of the age of the Universe are...given that we may be seeing a paradigm shift in cosmology with how we have been finding things that the ΛCDM model can't explain and all.
December 30, 2025 at 3:02 PM
I wonder how precise our current figures of the age of the Universe are...given that we may be seeing a paradigm shift in cosmology with how we have been finding things that the ΛCDM model can't explain and all.
Quantum–Kinetic Dark Energy (QKDE) offers a minimal, GR-preserving alternative to ΛCDM where the scalar kinetic term drifts in time—no new forces, no modified gravity.
📄 zenodo.org/records/1777...
#Cosmology #DarkEnergy #Astrophysics #LambdaCDM #QKDE #Physics #Science
📄 zenodo.org/records/1777...
#Cosmology #DarkEnergy #Astrophysics #LambdaCDM #QKDE #Physics #Science
Quantum–Kinetic Dark Energy (QKDE): A GR-preserving dark energy framework with a time-dependent scalar kinetic normalization
This work introduces Quantum–Kinetic Dark Energy (QKDE), a minimal extension of late-time cosmology that keeps General Relativity intact while allowing the kinetic normalization of a single scalar fie...
zenodo.org
December 9, 2025 at 11:23 PM
Quantum–Kinetic Dark Energy (QKDE) offers a minimal, GR-preserving alternative to ΛCDM where the scalar kinetic term drifts in time—no new forces, no modified gravity.
📄 zenodo.org/records/1777...
#Cosmology #DarkEnergy #Astrophysics #LambdaCDM #QKDE #Physics #Science
📄 zenodo.org/records/1777...
#Cosmology #DarkEnergy #Astrophysics #LambdaCDM #QKDE #Physics #Science
als we uitgaan van het huidige standaardmodel van de kosmologie (ΛCDM) en als protonen niet vervallen, dan zal het heelal op extreem lange termijn inderdaad vrijwel volledig bestaan uit zwarte dwergen (en een paar andere restanten).
November 24, 2025 at 7:31 PM
als we uitgaan van het huidige standaardmodel van de kosmologie (ΛCDM) en als protonen niet vervallen, dan zal het heelal op extreem lange termijn inderdaad vrijwel volledig bestaan uit zwarte dwergen (en een paar andere restanten).
Congratulations to Dr. Helena García Escudero in successfully defending her PhD dissertation today at UCI Department of Physics & Astronomy, titled “ΛCDM and Beyond: Neutrinos and the Puzzle of Cosmological Tensions.”
#ucirvine #academia #physics #cosmology
#ucirvine #academia #physics #cosmology
November 21, 2025 at 12:04 AM
Congratulations to Dr. Helena García Escudero in successfully defending her PhD dissertation today at UCI Department of Physics & Astronomy, titled “ΛCDM and Beyond: Neutrinos and the Puzzle of Cosmological Tensions.”
#ucirvine #academia #physics #cosmology
#ucirvine #academia #physics #cosmology
💡 Summary by GPT3:
ジェームズ・ウェッブ宇宙望遠鏡を使用している天文学者たちは、一般的に受け入れられている暗黒物質の理論に挑戦する修正されたニュートン力学（MOND）と呼ばれる代替理論を支持する証拠を見つけました。古代銀河の観測結果は、暗黒物質を用いて銀河の形成を説明するΛ-CDMモデルの予測と矛盾しています。一部の観測結果を説明するMONDの成功にもかかわらず、MONDとΛ-CDMの間の論争は続いており、両方の理論にはそれぞれの強みと課題があります。
ジェームズ・ウェッブ宇宙望遠鏡を使用している天文学者たちは、一般的に受け入れられている暗黒物質の理論に挑戦する修正されたニュートン力学（MOND）と呼ばれる代替理論を支持する証拠を見つけました。古代銀河の観測結果は、暗黒物質を用いて銀河の形成を説明するΛ-CDMモデルの予測と矛盾しています。一部の観測結果を説明するMONDの成功にもかかわらず、MONDとΛ-CDMの間の論争は続いており、両方の理論にはそれぞれの強みと課題があります。
November 17, 2024 at 7:43 AM
💡 Summary by GPT3:
ジェームズ・ウェッブ宇宙望遠鏡を使用している天文学者たちは、一般的に受け入れられている暗黒物質の理論に挑戦する修正されたニュートン力学（MOND）と呼ばれる代替理論を支持する証拠を見つけました。古代銀河の観測結果は、暗黒物質を用いて銀河の形成を説明するΛ-CDMモデルの予測と矛盾しています。一部の観測結果を説明するMONDの成功にもかかわらず、MONDとΛ-CDMの間の論争は続いており、両方の理論にはそれぞれの強みと課題があります。
ジェームズ・ウェッブ宇宙望遠鏡を使用している天文学者たちは、一般的に受け入れられている暗黒物質の理論に挑戦する修正されたニュートン力学（MOND）と呼ばれる代替理論を支持する証拠を見つけました。古代銀河の観測結果は、暗黒物質を用いて銀河の形成を説明するΛ-CDMモデルの予測と矛盾しています。一部の観測結果を説明するMONDの成功にもかかわらず、MONDとΛ-CDMの間の論争は続いており、両方の理論にはそれぞれの強みと課題があります。
$Λ$CDM and early dark energy in latent space: a data-driven parametrization of the CMB temperature power spectrum
https://arxiv.org/pdf/2502.09810
Davide Piras, Laura Herold, Luisa Lucie-Smith, Eiichiro Komatsu
https://arxiv.org/pdf/2502.09810
Davide Piras, Laura Herold, Luisa Lucie-Smith, Eiichiro Komatsu
https://arxiv.org/abs/2502.09810
arXiv abstract link
arxiv.org
February 17, 2025 at 4:01 AM
$Λ$CDM and early dark energy in latent space: a data-driven parametrization of the CMB temperature power spectrum
https://arxiv.org/pdf/2502.09810
Davide Piras, Laura Herold, Luisa Lucie-Smith, Eiichiro Komatsu
https://arxiv.org/pdf/2502.09810
Davide Piras, Laura Herold, Luisa Lucie-Smith, Eiichiro Komatsu
Interpreting Cosmic Birefringence and DESI Data with Evolving Axion in $Λ$CDM
https://arxiv.org/pdf/2503.18924
Shota Nakagawa, Yuichiro Nakai, Yu-Cheng Qiu, Masaki Yamada.
https://arxiv.org/pdf/2503.18924
Shota Nakagawa, Yuichiro Nakai, Yu-Cheng Qiu, Masaki Yamada.
https://arxiv.org/abs/2503.18924
arXiv abstract link
arxiv.org
March 25, 2025 at 4:37 AM
Interpreting Cosmic Birefringence and DESI Data with Evolving Axion in $Λ$CDM
https://arxiv.org/pdf/2503.18924
Shota Nakagawa, Yuichiro Nakai, Yu-Cheng Qiu, Masaki Yamada.
https://arxiv.org/pdf/2503.18924
Shota Nakagawa, Yuichiro Nakai, Yu-Cheng Qiu, Masaki Yamada.
Why should one be surprised that the ΛCDM model is wrong? The investigators have been analyzing the SNe Ia data with incorrect math. Of course the results from the HST are wrong; ΛCDM model predicts the position of the Milky Way will be -infinity in the future. See doi 10.5772/intechopen.1012636
January 4, 2026 at 9:54 PM
Why should one be surprised that the ΛCDM model is wrong? The investigators have been analyzing the SNe Ia data with incorrect math. Of course the results from the HST are wrong; ΛCDM model predicts the position of the Milky Way will be -infinity in the future. See doi 10.5772/intechopen.1012636
Only 0.2% of simulated analogs are both as flattened and as kinematically coherent. This is a lower limit: 2 of 14 considered dwarfs have no measured velocities, they could enhance the correlation. NGC4490 is thus in similar conflict with ΛCDM as the 3 known satellite planes.
May 13, 2024 at 6:50 AM
Only 0.2% of simulated analogs are both as flattened and as kinematically coherent. This is a lower limit: 2 of 14 considered dwarfs have no measured velocities, they could enhance the correlation. NGC4490 is thus in similar conflict with ΛCDM as the 3 known satellite planes.
"zomg some site has a wild theory & everything we learned was wrong" - TLDR; nope, not how science works.
ΛCDM explains 100yrs of observations & any new theory will have to account for all of that. And more*.
*Current puzzle: Hubble Tension. Doesn't mean cosmology is in crisis. New insights await.
ΛCDM explains 100yrs of observations & any new theory will have to account for all of that. And more*.
*Current puzzle: Hubble Tension. Doesn't mean cosmology is in crisis. New insights await.
A new claim that dark energy isn’t necessary, we just need to properly account for inhomogeneities in the universe. Maybe. But his idea has been discussed for a long time - David Wiltshire, an author here, has been pushing it for 20 years, and others have also looked at it. (1/n)
Astrophysics! What are your hot takes on this? I’m stuck at the airport and want to fight about space.
www.sci.news/astronomy/da...
www.sci.news/astronomy/da...
December 27, 2024 at 7:10 PM
"zomg some site has a wild theory & everything we learned was wrong" - TLDR; nope, not how science works.
ΛCDM explains 100yrs of observations & any new theory will have to account for all of that. And more*.
*Current puzzle: Hubble Tension. Doesn't mean cosmology is in crisis. New insights await.
ΛCDM explains 100yrs of observations & any new theory will have to account for all of that. And more*.
*Current puzzle: Hubble Tension. Doesn't mean cosmology is in crisis. New insights await.
Missing Components in ΛCDM from DESI Y1 BAO Measurements: Insights from Redshift Remapping
https://arxiv.org/pdf/2503.22469
E. Fernández-García et al.
https://arxiv.org/pdf/2503.22469
E. Fernández-García et al.
https://arxiv.org/abs/2503.22469
arXiv abstract link
arxiv.org
March 31, 2025 at 4:31 AM
Missing Components in ΛCDM from DESI Y1 BAO Measurements: Insights from Redshift Remapping
https://arxiv.org/pdf/2503.22469
E. Fernández-García et al.
https://arxiv.org/pdf/2503.22469
E. Fernández-García et al.
Gigaparsec structures are nowhere to be seen in $Λ$CDM: an enhanced analysis of LSS in FLAMINGO-10K simulations. A.M Lopez et. al. https://arxiv.org/abs/2504.14940
April 22, 2025 at 9:38 AM
Gigaparsec structures are nowhere to be seen in $Λ$CDM: an enhanced analysis of LSS in FLAMINGO-10K simulations. A.M Lopez et. al. https://arxiv.org/abs/2504.14940
Topological dark energy from spacetime foam: A challenge for $Λ$CDM. Fotios K. Anagnostopoulos et. al. https://arxiv.org/abs/2507.18389
July 25, 2025 at 8:06 AM
Topological dark energy from spacetime foam: A challenge for $Λ$CDM. Fotios K. Anagnostopoulos et. al. https://arxiv.org/abs/2507.18389
Nieuw clusteronderzoek toont dat S₈ toch overeenstemt met het ΛCDM heelalmodel
www.astroblogs.nl/2025/10/23/n...
www.astroblogs.nl/2025/10/23/n...
October 23, 2025 at 9:43 AM
Nieuw clusteronderzoek toont dat S₈ toch overeenstemt met het ΛCDM heelalmodel
www.astroblogs.nl/2025/10/23/n...
www.astroblogs.nl/2025/10/23/n...
Lambda-CDM model I presume? What's your preferred Λ? Much can be explained if dark matter density determines Λ...
February 14, 2025 at 2:08 AM
Lambda-CDM model I presume? What's your preferred Λ? Much can be explained if dark matter density determines Λ...
🪐 A bombshell from DESI: the largest-ever cosmic map hints that dark energy — long thought constant — 𝙢𝙖𝙮 𝙗𝙚 𝙘𝙝𝙖𝙣𝙜𝙞𝙣𝙜 𝙤𝙫𝙚𝙧 𝙩𝙞𝙢𝙚. If confirmed, this undercuts the core assumption of our ΛCDM model. ⤵
March 26, 2025 at 6:00 PM
🪐 A bombshell from DESI: the largest-ever cosmic map hints that dark energy — long thought constant — 𝙢𝙖𝙮 𝙗𝙚 𝙘𝙝𝙖𝙣𝙜𝙞𝙣𝙜 𝙤𝙫𝙚𝙧 𝙩𝙞𝙢𝙚. If confirmed, this undercuts the core assumption of our ΛCDM model. ⤵
Gigaparsec structures are nowhere to be seen in $Λ$CDM: an enhanced analysis of LSS in FLAMINGO-10K simulations
https://arxiv.org/pdf/2504.14940
A.M Lopez, R.G. Clowes.
https://arxiv.org/pdf/2504.14940
A.M Lopez, R.G. Clowes.
https://arxiv.org/abs/2504.14940
arXiv abstract link
arxiv.org
April 22, 2025 at 4:32 AM
Gigaparsec structures are nowhere to be seen in $Λ$CDM: an enhanced analysis of LSS in FLAMINGO-10K simulations
https://arxiv.org/pdf/2504.14940
A.M Lopez, R.G. Clowes.
https://arxiv.org/pdf/2504.14940
A.M Lopez, R.G. Clowes.
5/
evidence, but is in line with some observations. On the contribution of ETGs to the CMB (at least 1.4% of the energy density), the paper does not reject ΛCDM, but proposes that thermalized radiation from dust may complicate the interpretation of the anisotropies, requiring a revision of the
evidence, but is in line with some observations. On the contribution of ETGs to the CMB (at least 1.4% of the energy density), the paper does not reject ΛCDM, but proposes that thermalized radiation from dust may complicate the interpretation of the anisotropies, requiring a revision of the
July 12, 2025 at 8:20 PM
5/
evidence, but is in line with some observations. On the contribution of ETGs to the CMB (at least 1.4% of the energy density), the paper does not reject ΛCDM, but proposes that thermalized radiation from dust may complicate the interpretation of the anisotropies, requiring a revision of the
evidence, but is in line with some observations. On the contribution of ETGs to the CMB (at least 1.4% of the energy density), the paper does not reject ΛCDM, but proposes that thermalized radiation from dust may complicate the interpretation of the anisotropies, requiring a revision of the
My paper noting a curious ΛCDM growth-factor normalisation is out: doi.org/10.3847/2515...
I’m interested in other instances where J-type normalization kernels (or multi-parameter generalizations, of which this J is the flat-LCDM slice) show up in analytic #cosmology. Could they bias pipelines?
🔭🧪
I’m interested in other instances where J-type normalization kernels (or multi-parameter generalizations, of which this J is the flat-LCDM slice) show up in analytic #cosmology. Could they bias pipelines?
🔭🧪
A Curious Normalization of the ΛCDM Linear Growth Factor
A Curious Normalization of the ΛCDM Linear Growth Factor, Janzen, Daryl
doi.org
December 24, 2025 at 7:19 PM
My paper noting a curious ΛCDM growth-factor normalisation is out: doi.org/10.3847/2515...
I’m interested in other instances where J-type normalization kernels (or multi-parameter generalizations, of which this J is the flat-LCDM slice) show up in analytic #cosmology. Could they bias pipelines?
🔭🧪
I’m interested in other instances where J-type normalization kernels (or multi-parameter generalizations, of which this J is the flat-LCDM slice) show up in analytic #cosmology. Could they bias pipelines?
🔭🧪
"Our current cosmological model—known as lambda cold dark matter, or ΛCDM—relies on hypothesized dark energy to explain the accelerating expansion of the universe.
However, one competing theory known as “timescape cosmology” suggests that many observations can be explained by differences in […]
However, one competing theory known as “timescape cosmology” suggests that many observations can be explained by differences in […]
Original post on coracle.social
coracle.social
January 12, 2025 at 9:45 PM
"Our current cosmological model—known as lambda cold dark matter, or ΛCDM—relies on hypothesized dark energy to explain the accelerating expansion of the universe.
However, one competing theory known as “timescape cosmology” suggests that many observations can be explained by differences in […]
However, one competing theory known as “timescape cosmology” suggests that many observations can be explained by differences in […]
Final SPTpol TE, EE power spectrum from full 4-year data set! "dataset is well-fit by the ΛCDM model, for which we find H0=70.48±2.16 km/s/Mpc and Ωm=0.271±0.026 using only the SPTpol data" Great PhD thesis work from Jody Chou! #southpole
@NSF arxiv.org/abs/2501.06890
@NSF arxiv.org/abs/2501.06890
January 17, 2025 at 8:15 PM
Final SPTpol TE, EE power spectrum from full 4-year data set! "dataset is well-fit by the ΛCDM model, for which we find H0=70.48±2.16 km/s/Mpc and Ωm=0.271±0.026 using only the SPTpol data" Great PhD thesis work from Jody Chou! #southpole
@NSF arxiv.org/abs/2501.06890
@NSF arxiv.org/abs/2501.06890
On DESI's DR2 exclusion of $Λ$CDM. Marina Cortês et. al. https://arxiv.org/abs/2504.15336
April 23, 2025 at 3:35 AM
On DESI's DR2 exclusion of $Λ$CDM. Marina Cortês et. al. https://arxiv.org/abs/2504.15336
Those jumbo galaxies – some as hefty as today’s Milky Way – seemed to upend the standard Lambda Cold Dark Matter (ΛCDM) framework. www.earth.com/news/three-r...
Three 'Red Monsters' discovered as Webb Telescope team declares "beginning of a new era"
Webb discovered an early cosmic boom of "red monster" galaxies, surprising even seasoned researchers who thought they knew how galaxies grow.
www.earth.com
May 3, 2025 at 6:58 PM
Those jumbo galaxies – some as hefty as today’s Milky Way – seemed to upend the standard Lambda Cold Dark Matter (ΛCDM) framework. www.earth.com/news/three-r...
#arXiv Probing the H0 Tension with Holographic Dark Energy in Unimodular Gravity: Insights from DESI DR2 arxiv.org/abs/2508.21175 the implementation of holographic dark energy in Unimodular Gravity does not alleviate the Hubble tension and is not statistically preferred to ΛCDM.
September 7, 2025 at 7:19 PM
#arXiv Probing the H0 Tension with Holographic Dark Energy in Unimodular Gravity: Insights from DESI DR2 arxiv.org/abs/2508.21175 the implementation of holographic dark energy in Unimodular Gravity does not alleviate the Hubble tension and is not statistically preferred to ΛCDM.
Currently we have ΛCDM .... waiting for that pack of non-science to fall.
December 10, 2024 at 10:44 AM
Currently we have ΛCDM .... waiting for that pack of non-science to fall.