Results 81 to 90 of about 355,593 (244)

Primordial Gas Collapse in The Presence of Radiation: Direct Collapse Black Hole or Population III star?

, 2018
The first billion years in the evolution of the Universe mark the formation of the first stars, black holes and galaxies. The radiation from the first galaxies plays an important role in determining the final state of primordial gas collapsing in a ...
Agarwal, Bhaskar
core   +1 more source

Tests for primordial non-Gaussianity [PDF]

, 2000
We investigate the relative sensitivities of several tests for deviations from Gaussianity in the primordial distribution of density perturbations. We consider models for non-Gaussianity that mimic that which comes from inflation as well as that which ...
Albrecht, L. Verde, M. Kamionkowski, R. Jimenez, S. Matarrese, Turok, Vachaspati   +6 more
core   +2 more sources

Constraints on blue and red tilted primordial power spectra using dwarf galaxy properties [PDF]

Physical Review D
Although the standard $\Lambda$+Cold Dark Matter ($\Lambda$CDM) model is well tested on large scales, the primordial power spectrum may deviate from the $\Lambda$CDM spectrum on small scales due to specific dark matter properties or alternative ...
A. Dekker, A. Kravtsov
semanticscholar   +1 more source

Axion Black Hole Solution in Non‐Metricity Gravity

Fortschritte der Physik, Volume 74, Issue 2, February 2026.
Abstract A static, spherically symmetric black hole solution in symmetric teleparallel (non‐metricity) gravity sourced by an axion field is constructed. Starting from the modified field equations, exact configurations are obtained characterized by the mass M$M$ and an axion–geometry coupling β$\beta$, with temporal metric function A(r)=1−2Mr+βr$A(r)=1-\
A. Eid, G.G.L. Nashed
wiley   +1 more source

Primordial magnetic field constraints from the end of reionization

, 2011
Primordial magnetic fields generated in the early universe are subject of considerable investigation, and observational limits on their strength are required to constrain the theory.
Ando, Banerjee, Barrow, Battaner, Baym, Beck, Bernet, Bertone, Bolton, Bouwens, Caprini, Cheng, Clarke, Coles, Dominik R. G. Schleicher, Dubois, Durrer, Federrath, Francesco Miniati, Gnedin, Grasso, Grasso, Kim, Komatsu, Latif, Madau, Madau, Miniati, Miniati, Miniati, Mortlock, Murphy, Neronov, Quashnock, Ryu, Salvaterra, Schleicher, Schleicher, Schlickeiser, Seager, Sethi, Sigl, Srbinovsky, Subramanian, Subramanian, Sur, Tashiro, Tavecchio, Taylor, Turner, Yamazaki   +50 more
core   +1 more source

Identifying Old Tidal Dwarf Irregulars [PDF]

, 2000
We examine the observational consequences of the two possible origins for irregular galaxies: formation from collapse of a primordial cloud of gas early in the age of the Universe, and formation from tidal tails in an interaction that could have occured ...
Bottinelli L., Broeils A. H., de Blok W. J. G., Deidre A. Hunter, Duc P.-A., Edmunds M. G., Erin W. Roye, Ferraro F. R., Israel F., Lee H., McIntyre V. J., Mirabel I. F., Mirabel I. F., Sally D. Hunsberger, Skillman E. D., Tully R. B., Zwicky F.   +16 more
core   +3 more sources

Dwarf galaxies as a probe of a primordially magnetized Universe [PDF]

Astronomy & Astrophysics
Aims : The true nature of primordial magnetic fields (PMFs) and their role in the formation of galaxies remains elusive. To shed light on these unknowns, we investigated their impact by varying two sets of properties: (i) accounting for the effect of ...
M. Sanati, S. Martin-Alvarez, J. Schober, Y. Revaz, A. Slyz, J. Devriendt   +5 more
semanticscholar   +1 more source

Logarithmic and Strong Coupling Models in Weyl‐Type f(Q,T)$f(Q,T)$ Gravity

Annalen der Physik, Volume 538, Issue 1, January 2026.
This work explores Weyl‐type f(Q,T) gravity using recent observational datasets — CC, Pantheon+, Union 3.0, and DESI DR2. Through MCMC analysis of logarithmic and strong coupling models, the study reveals a transition from deceleration to acceleration, quintessence‐to‐phantom dynamics, and late‐time consistency with LCDM, offering a geometry‐driven ...
Rahul Bhagat, S. K. Tripathy, B. Mishra
wiley   +1 more source

New chemical evolution analytical solutions including environment effects

, 2015
In the last years, more and more interest has been devoted to analytical solutions, including inflow and outflow, to study the metallicity enrichment in galaxies.
Spitoni, E.
core   +1 more source

Formation of Asteroid (16) Psyche by a Giant Impact

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Asteroid (16) Psyche is the largest likely metal‐rich asteroid in the Solar System and the target of the NASA Psyche mission. The mission aims to determine whether the asteroid is the core of a differentiated planetesimal that lost its mantle via a giant impact.
Saverio Cambioni, Benjamin P. Weiss, Namya Baijal, Robert Melikyan, Erik Asphaug, John B. Biersteker, Richard P. Binzel, William F. Bottke, Samuel W. Courville, Linda T. Elkins‐Tanton, David J. Lawrence, José M. G. Merayo, Carol A. Raymond, Mark A. Wieczorek, Maria T. Zuber   +14 more
wiley   +1 more source