Results 101 to 110 of about 21,978 (196)

Field theory axiverse

Physical Review D
Axion and axionlike particles are a prominent candidate for physics beyond the Standard Model and can play an important role in cosmology, serving as dark matter or dark energy, or both, drawing motivation in part from the string theory axiverse ...
Stephon Alexander, Tucker Manton, Evan McDonough   +2 more
semanticscholar   +1 more source

The new νMSM (ννMSM): radiative neutrino masses, keV-scale dark matter and viable leptogenesis with sub-TeV new physics

Journal of High Energy Physics, 2018
We study the scenario in which the Standard model is augmented by three generations of right-handed neutrinos and a scalar doublet. The newly introduced fields share an odd charge under a ℤ2 parity symmetry.
Sven Baumholzer, Vedran Brdar, Pedro Schwaller   +2 more
doaj   +1 more source

Scalar-Tensor Gravity Cosmology: Noether symmetries and analytical solutions

, 2014
In this paper, we present a complete Noether Symmetry analysis in the framework of scalar-tensor cosmology. Specifically, we consider a non-minimally coupled scalar field action embedded in the FLRW spacetime and provide a full set of Noether symmetries ...
Basilakos, S., Capozziello, S., Paliathanasis, A., Tsamparlis, M.   +3 more
core   +1 more source

Intrusion‐Induced Forced Folding Model for the Origin of Séítah Formation Domes on the Jezero Crater Floor, Mars

Journal of Geophysical Research: Planets, Volume 131, Issue 3, March 2026.
Abstract The JPL rover Perseverance's investigations of Jezero crater's floor reveal that the ultramafic Séítah formation and the overlying mafic Máaz formation are deformed into a broad, low‐amplitude structural dome. Mastcam‐Z stereo images processed into digital outcrop models, together with RIMFAX ground‐penetrating radar profiles, were used to ...
Robert Barnes, Sanjeev Gupta, Allan Treiman, Steven Sholes, Gerhard Paar, Christian Tate, Andreas Bechtold, Katie Stack‐Morgan, James F. Bell III, Justin Maki, Briony Horgan, Jorge Nuñez, Chris Traxler, Thomas Ortner, Emileigh S. Shoemaker Thackston, Svein‐Erik Hamran, Sanna Alwmark, Melissa Rice, Vivian Sun, Olivier Beyssac, Andrew Annex, Adrian Brown, Linda Kah, David Flannery, Justin I. Simon, Sebastian Walter, Keyron Hickman‐Lewis, Ken Farley   +27 more
wiley   +1 more source

Finding Horndeski theories with Einstein gravity limits

, 2016
The Horndeski action is the most general scalar-tensor theory with at most second-order derivatives in the equations of motion, thus evading Ostrogradsky instabilities and making it of interest when modifying gravity at large scales.
Lombriser, Lucas, McManus, Ryan, Peñarrubia, Jorge   +2 more
core   +1 more source

Limit to General Relativity in f(R) theories of gravity

, 2007
We discuss two aspects of f(R) theories of gravity in metric formalism. We first study the reasons to introduce a scalar-tensor representation for these theories and the behavior of this representation in the limit to General Relativity, f(R)--> R.
C. M. Will, C. W. Misner, Gonzalo J. Olmo, T. Padmanabhan   +3 more
core   +1 more source

Two-mediator dark matter models and cosmic electron excess

Journal of High Energy Physics, 2019
The cosmic electron energy spectrum recently observed by the DAMPE experiment exhibits two interesting features, including a break around 0.9 TeV and a sharp resonance near 1.4 TeV.
Xuewen Liu, Zuowei Liu, Yushan Su
doaj   +1 more source

Cosmological Constraints on Horndeski Gravity in Light of GW170817

, 2018
The discovery of the electromagnetic counterpart to GW170817 severely constrains the tensor mode propagation speed, eliminating a large model space of Horndeski theory. We use the cosmic microwave background data from Planck and the joint analysis of the
Komatsu, E., Kreisch, C. D.
core   +1 more source

Clockworking FIMPs

Journal of High Energy Physics, 2018
We study freeze-in dark matter production in models that rely on the Clock-work mechanism to suppress the dark matter couplings to the visible sector. We construct viable scalar and fermionic dark matter models within this “Clockwork FIMP” scenario, with
Andreas Goudelis, Kirtimaan A. Mohan, Dipan Sengupta   +2 more
doaj   +1 more source

Detection of early-universe gravitational-wave signatures and fundamental physics. [PDF]

Gen Relativ Gravit, 2022
Caldwell R, Cui Y, Guo HK, Mandic V, Mariotti A, No JM, Ramsey-Musolf MJ, Sakellariadou M, Sinha K, Wang LT, White G, Zhao Y, An H, Bian L, Caprini C, Clesse S, Cline JM, Cusin G, Fornal B, Jinno R, Laurent B, Levi N, Lyu KF, Martinez M, Miller AL, Redigolo D, Scarlata C, Sevrin A, Haghi BSE, Shu J, Siemens X, Steer DA, Sundrum R, Tamarit C, Weir DJ, Xie KP, Yang FW, Zhou S.   +37 more
europepmc   +1 more source