activity
20012026
most citedAdiabatic CMB perturbations in pre-big bang string cosmology

867 citations · 5.8k across the 70 of their papers we have counts for

collaborators

70 papers

hep-th2026

Three Advanced Lectures on Inflation

Martin S. Sloth

Lecture notes on inflation. The lectures are three double lectures, held for the first time at the Nordita Winter School 2024 - Particle Physics and Cosmology, covering an advanced…

astro-ph.CO2026

The End of the First Act: Spectral Running, Interacting Dark Radiation, and the Hubble Tension in Light of ACT DR6 Data

Mathias Garny, Florian Niedermann, Martin S. Sloth

We point out that constraints on reported by the ACT collaboration in their DR6 data release are surprisingly sensitive to the assumptions made about the initial…

astro-ph.CO2026

Dark Acoustic Oscillations and the Hubble Tension

Mathias Garny, Florian Niedermann, Martin S. Sloth

The Hubble tension and the recently reported anomaly in data from the Dark Energy Spectroscopic Instrument (DESI) are considered to pose serious challenges to the standard CDM m…

astro-ph.CO2025★ 2 cited

Dark Acoustic Oscillations as an Early-Universe Explanation of the DESI Anomaly

Mathias Garny, Florian Niedermann, Martin S. Sloth

DESI DR2 data have been widely interpreted as evidence for late-time evolving dark energy (DE) with an apparent phantom crossing. Here we investigate an alternative explanation, ba…

astro-ph.CO2025

Hot New Early Dark Energy: Dark Radiation Matter Decoupling

Mathias Garny, Florian Niedermann, Henrique Rubira +1

We present a microscopic model of the dark sector that resolves the Hubble tension within standard current data sets (Planck 2018, Pantheon+ and DESI DR2 BAO) based on well-known f…

astro-ph.CO2025★ 299 cited

The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics

Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533

The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…