Results 91 to 100 of about 37,989 (204)

The fall of the Haag (LL4‐6) chondrite breccia—Just 8 years after the nearby fall Stubenberg (LL6)

Meteoritics &Planetary Science, Volume 60, Issue 11, Page 2676-2702, November 2025.
Abstract On October 24, 2024, an impressive fireball was visible over Austria. After the possible strewn field was calculated, the first sample of the Haag meteorite, with a mass of 8.76 g, was discovered on November 2, 2024, 8 days after the fireball event. Four more samples were found afterward putting the total sample mass at about 151 g.
Addi Bischoff, Markus Patzek, Jean‐Alix Barrat, Stig Bartel, Jasper Berndt, Henner Busemann, Tommaso Di Rocco, Mattias Ek, Manuela A. Fehr, Dieter Heinlein, Daniela Krietsch, Björn Lehnert, Colin Maden, Oscar Marchhart, Martin Martschini, Silke Merchel, Andreas Pack, Andrea Patzer, Marie Pichotta, Maximilian P. Reitze, Philippe Schmitt‐Kopplin, Maria Schönbächler, Leon Thannheiser, Iris Weber, Alexander Wieser, Karl Wimmer   +25 more
wiley   +1 more source

Second order Langevin equation and definition of quantum gravity by stochastic quantisation

Nuclear Physics B, 2020
Euclidean quantum gravity might be defined by stochastic quantisation that is governed by a higher order Langevin equation rather than a first order stochastic equation.
Laurent Baulieu, Siye Wu
doaj   +1 more source

Scale Dependence of the Halo Bias in General Local-Type Non-Gaussian Models I: Analytical Predictions and Consistency Relations

, 2012
We investigate the clustering of halos in cosmological models starting with general local-type non-Gaussian primordial fluctuations. We employ multiple Gaussian fields and add local-type non-Gaussian corrections at arbitrary order to cover a class of ...
, A. Becker, A. Lewis, A. Pillepich, A. Slosar, B.A. Reid, C. Wagner, C.T. Byrnes, C.T. Byrnes, D. Jeong, E. Sefusatti, H. Mo, J.-O. Gong, J.-Q. Xia, J.-Q. Xia ., K. Enqvist, K.M. Smith, K.M. Smith, L. Verde, M. LoVerde, M. LoVerde, M. Maggiore, N. Kaiser, R. Scoccimarro, S. Chongchitnan, S. Cole, S. Matarrese, S. Matarrese, S. Shandera, S. Yokoyama, T. Baldauf, T. Nishimichi, T. Suyama, T.Y. Lam, Takahiro Nishimichi, The Planck collaboration, WMAP collaboration   +36 more
core   +1 more source

Mixing of Primordial Gas in Lyman Break Galaxies

The Astrophysical Journal, 2006
Motivated by an interpretation of $z \sim 3$ objects by Jimenez and Haiman (2006), we examine processes that control the fraction of primordial ($Z = 0$) gas, and so primordial stars, in high-SFR Lyman break galaxies. A primordial fraction different from 1 or 0 requires microscopic diffusion catalyzed by a velocity field with timescale comparable to ...
Pan, Liubin, Scalo, John
openaire   +2 more sources

Two Micron‐Size Dark Dimensions

Fortschritte der Physik, Volume 73, Issue 8, August 2025.
Abstract Two extra dimensions of micron scale might simultaneously address the gauge and cosmological hierarchy problems. In this paper various observational bounds in scenarios with one and two large extra dimensions are examined, to see if they are compatible with the micron scale.
Luis A. Anchordoqui, Ignatios Antoniadis, Dieter Lüst   +2 more
wiley   +1 more source

StarNet: An In Situ Surrogate Model of Primordial Star Formation and Feedback for Astrophysical Simulations

The Astrophysical Journal Supplement Series
This work introduces StarNet , an in situ surrogate model for primordial star formation and feedback within cosmological simulations. Traditional simulations of primordial star formation and supernovae require extreme resolution to resolve both time and ...
Azton Wells, Michael L. Norman
doaj   +1 more source

Primordial Non-Gaussianity Systematics from Redshift Mismatch with SPHEREx

The Astrophysical Journal
The ability to differentiate between different models of inflation through the imprint of primordial non-Gaussianity (PNG) requires stringent constraints on the local PNG parameter ${f}_{\rm{NL}\,}^{\,\rm{loc}}$ .
Chandra Shekhar Saraf, David Parkinson
doaj   +1 more source

Scaling Relations of Early-Type Galaxies in MOND

Galaxies
We investigate the shape and morphology of early-type galaxies (ETGs) within the framework of Modified Newtonian Dynamics (MOND). Building on our previous studies, which demonstrated that the monolithic collapse of primordial gas clouds in MOND produces ...
Robin Eappen, Pavel Kroupa
doaj   +1 more source

The Stellar Initial Mass Function in Primordial Galaxies

The Astrophysical Journal, 2002
In the context of star formation through fragmentation of an extremely metal-deficient protogalactic cloud, the gravitational collapse of filamentary gas clouds is explored with 1D numerical hydrodynamics coupled with non-equilibrium chemistry of H$_2$ and HD.
Nakamura, Fumitaka, Umemura, Masayuki
openaire   +2 more sources

Star Formation for Predictive Primordial Galaxy Formation [PDF]

, 2016
The elegance of inflationary cosmology and cosmological perturbation theory ends with the formation of the first stars and galaxies, the initial sources of light that launched the phenomenologically rich process of cosmic reionization. Here we review the current understanding of early star formation, emphasizing unsolved problems and technical ...
Milosavljevic, Milos, Safranek-Shrader, Chalence   +1 more
openaire   +2 more sources