Results 81 to 90 of about 48,479 (254)

Observational Exclusion of a Consistent Quantum Cosmology Scenario

, 2015
It is often argued that inflation erases all the information about what took place before it started. Quantum gravity, relevant in the Planck era, seems therefore mostly impossible to probe with cosmological observations.
Barrau, Aurelien, Bolliet, Boris, Grain, Julien, Schander, Susanne   +3 more
core   +3 more sources

Unification of Conformal and Fuzzy Gravities With Internal Interactions Resulting in SO(10) and a Possible Probe Through Stochastic Gravitational Wave Background

Fortschritte der Physik, Volume 73, Issue 9-10, October 2025.
Abstract The unification of conformal and fuzzy gravities with internal interactions is based on the facts that i) the tangent group of a curved manifold and the manifold itself do not necessarily have the same dimensions and ii) both gravitational theories considered here have been formulated in a gauge theoretic way.
Gregory Patellis, Danai Roumelioti, Stelios Stefas, George Zoupanos   +3 more
wiley   +1 more source

Unity of Cosmological Inflation Attractors

Physical Review Letters, 2015
Recently, several broad classes of inflationary models have been discovered whose cosmological predictions, in excellent agreement with Planck, are stable with respect to significant modifications of the inflaton potential. Some classes of models are based on a nonminimal coupling to gravity. These models, which we call ξ attractors, describe universal
Renata Kallosh, Diederik Roest, Andrei Linde, Mario Galante   +3 more
openaire   +4 more sources

Mineralogically Diverse and Salt‐Rich Regolith in Jezero Crater Characterized Using X‐Ray Spectroscopy

Journal of Geophysical Research: Planets, Volume 130, Issue 10, October 2025.
Abstract The Planetary Instrument for X‐ray Lithochemistry (PIXL) onboard the Perseverance rover has characterized the composition of Martian regolith at a scale of hundreds of microns using micro‐focus X‐ray fluorescence spectroscopy. PIXL data reveal a diverse population of regolith grains with distinct spectral, chemical, and crystallographic ...
Andrew O. Shumway, Tanya V. Kizovski, David C. Catling, Scott J. VanBommel, Michael W. M. Jones, Brendan J. Orenstein, Mariek E. Schmidt, Michael M. Tice, Joel A. Hurowitz, Abigail L. Knight, Benton C. Clark, Lawrence Wade, Emily L. Cardarelli, An Y. Li, Mike J. Zawaski, David A. Klevang, William T. Elam, Elisabeth M. Hausrath, Allan H. Treiman, Jesper Henneke, Nicholas J. Tosca, Yang Liu, Morgan L. Cable, Abigail C. Allwood   +23 more
wiley   +1 more source

Lectures on Cosmic Inflation and its Potential Stringy Realizations

, 2007
These notes present a brief introduction to Hot Big Bang cosmology and Cosmic Inflation, together with a selection of some recent attempts to embed inflation into string theory.
Acharya B S, Achucarro A, Alabidi L Lyth D H, Allahverdi R, Avgoustidis A Cremades D Quevedo F, Balasubramanian V, Barnaby N, Barnaby N Cline J M, Baumann D Dymarsky A Klebanov I McAllister L Steinhardt P, Baumann D Dymarsky A Klebanov I R Maldacena J McAllister L Murugan A, Baumann D Dymarsky A Klebanov I R McAllister L, Becker K, Berg M, Berg M Haack M Pajer E, Blanco-Pillado J J, Blanco-Pillado J J, Blanco-Pillado J J, Brandenberger R H Nayeri A Patil S P Vafa C, Brax Ph van de Bruck C Davis A C Davis S C Jeannerot R Postma M, Burgess C P, Burgess C P, Burgess C P, Burgess C P, Burgess C P, Burgess C P, Burgess C P, Burgess C P, Burgess C P, Burgess C P, Burgess C P, Burgess C P, Burgess C P Holman R Hoover D, C P Burgess, Chen C M, Chen P, Chen X G, Chen X G, Chen X Tye S H, Chialva D, Cline J M, Conlon J P, Conlon J P, Conlon J P, Conlon J P Quevedo F, Copeland E J, Cremades D, Cremades D, Cremades D, Dasgupta K, Dasgupta K, Dasgupta K Hsu J P Kallosh R Linde A Zagermann M, de Carlos B, Denef F, Denef F Douglas M R Florea B Grassi A Kachru S, Denef F Douglas M R Florea B Grassi A Kachru S, DeWolfe O, Dimopoulos S Kachru S McGreevy J Wacker J G, Dodelson S, Dudas E, Dvali G, Dvali G, Dvali G R Shafi Q Solganik S, Enqvist K Mether L Nurmi S, Firouzjahi H, Freivogel B, Garcia-Bellido J, Gomez-Reino M, Green M B, Greene B Weltman A, Grishchuk L P, Herdeiro C, Hsu J P, Hsu J P, Iizuka N Trivedi S P, Jones N, Kachru S, Kachru S, Kallosh R, Kallosh R, Kallosh R, Kallosh R, Kaloper N, Kaloper N, Kinney W H, Kofman L, Kolb E W, Koyama F Tachikawa Y Watari T, Krause A Pajer E, Lalak Z, Lalak Z Langlois D Pokorski S Turzynski K, Lalak Z Ross G G Sarkar S, Langfelder P, Leblond L, Liddle A R, Linde A, Linde A, Linde A, Linde A, Linde A D, Linde A D, Lyth D H, McAllister L, Mukhanov V, Peebles P J E, Peiris H V Baumann D Friedman B Cooray A, Pilo L, Polarski D, Polchinski J, Polchinski J Efthimiou C Greene B, Postma M, Quevedo F, Ryden B, Saltman A, Shandera S E Tye S H, Simon J Jimenez R Verde L Berglund P Balasubramanian V, Spergel D N, Steinhardt P J, Tasinato G, Terning J, Tye S H H, Villadoro G, Weinberg S, Weinberg S, Westphal A, Westphal A, Zweibach B   +125 more
core   +1 more source

Cosmological Perturbations in Bouncing Cosmologies and the Case of the Pre-Big Bang Scenario

Universe, 2022
Pre-Big Bang cosmology inspired generations of cosmologists in attempts to cure the initial Big Bang singularity using a fundamental length scale as proposed by string theory.
Valerio Bozza
doaj   +1 more source

Dominant Trends in Jupiter's H3+ ${\mathbf{H}}_{\mathbf{3}}^{\mathbf{+}}$ Northern Aurora: II. Magnetospheric Mapping

Journal of Geophysical Research: Space Physics, Volume 130, Issue 10, October 2025.
Abstract Jupiter's auroral regions have previously been defined by broad‐scale auroral structures, but these are typically obscured by the wide array of temporal variability observed at timescales between minutes and days, making it difficult to understand the underlying magnetospheric biases driving these brightness differences.
Tom S. Stallard, Katie L. Knowles, Henrik Melin, Ruoyan Wang, Emma M. Thomas, Luke Moore, James O’Donoghue, Rosie E. Johnson, Steve Miller, John C. Coxon   +9 more
wiley   +1 more source

The cosmological heavy ion collider: Fast thermalization after cosmic inflation

Physics Letters B, 2020
Heavy-ion colliders have revealed the process of “fast thermalization”. This experimental break-through has led to new theoretical tools to study the thermalization process at both weak and strong coupling.
Evan McDonough
doaj   +1 more source

Is a loopy and noncommutative early Universe viable?

Physics Letters B, 2023
We conduct a (pre-)inflationary dynamics study of the chaotic quadratic potential within the framework of a simple noncommutative extension of effective loop quantum cosmology put forward recently.
Luis Rey Díaz-Barrón, Abraham Espinoza-García, S. Pérez-Payán, J. Socorro   +3 more
doaj   +1 more source

INFLATION AS AN ATTRACTOR IN SCALAR COSMOLOGY [PDF]

Modern Physics Letters A, 2013
We study an inflation mechanism based on attractor properties in cosmological evolutions of a spatially flat Friedmann–Robertson–Walker spacetime based on the Einstein-scalar field theory. We find a new way to get the Hamilton–Jacobi equation solving the field equations.
openaire   +4 more sources