Results 41 to 50 of about 2,716,965 (190)

Dark Dimension With (Little) Strings Attached

Fortschritte der Physik, EarlyView.
Abstract A relation between dark energy and the scale of new physics in weakly coupled string theory is motivated. This mixing between infrared and ultraviolet physics leads to a unique corner for real‐world phenomenology: barring fine‐tunings, the authors are naturally led to the “dark dimension” scenario, a single mesoscopic extra dimension of micron
Ivano Basile, Dieter Lüst
wiley   +1 more source

Thermal QCD Axions across Thresholds

Journal of High Energy Physics, 2021
Thermal axion production in the early universe goes through several mass thresholds, and the resulting rate may change dramatically across them. Focusing on the KSVZ and DFSZ frameworks for the invisible QCD axion, we perform a systematic analysis of ...
Francesco D’Eramo, Fazlollah Hajkarim, Seokhoon Yun   +2 more
doaj   +1 more source

Dark Radiation and Decaying Matter [PDF]

, 2012
Recent cosmological measurements favour additional relativistic energy density beyond the one provided by the three active neutrinos and photons of the Standard Model (SM). This is often referred to as "dark radiation", suggesting the need of new light states in the theory beyond those of the SM.
arxiv   +1 more source

Living beyond the edge: Higgs inflation and vacuum metastability [PDF]

Phys. Rev. D 92, 083512 (2015), 2014
The measurements of the Higgs mass and top Yukawa coupling indicate that we live in a very special Universe, at the edge of the absolute stability of the electroweak vacuum. If fully stable, the Standard Model (SM) can be extended all the way up to the inflationary scale and the Higgs field, non-minimally coupled to gravity with strength $\xi$, can be ...
arxiv   +1 more source

Dark Matter from Minimal Flavor Violation

, 2011
We consider theories of flavored dark matter, in which the dark matter particle is part of a multiplet transforming nontrivially under the flavor group of the Standard Model in a manner consistent with the principle of Minimal Flavor Violation (MFV). MFV
A Adulpravitchai, A Belyaev, A Falkowski, A Katz, A Lenz, AI Vainshtein, AJ Buras, AJ Buras, AL Kagan, AV Manohar, B Batell, B Batell, B Bellazzini, B Grinstein, Brian Batell, C-R Chen, CP Burgess, CW Bauer, D Meloni, DE Soper, DL Rainwater, E Gross, E Komatsu, E Ma, E Nikolidakis, F Chen, F D’Eramo, G Bertone, G D’Ambrosio, G Jungman, GD Kribs, GD Kribs, J Alwall, J Gallicchio, J Goodman, J Goodman, J March-Russell, J McDonald, J-H Kim, JM Arnold, JM Arnold, JM Butterworth, JM Campbell, JM Campbell, Josef Pradler, JR Ellis, K Agashe, LJ Hall, M Bahr, M Beltrán, M Blennow, M Cacciari, M Cacciari, M Carena, M Cirelli, M Hirsch, M Lisanti, M Trott, MA Shifman, Michael Spannowsky, MS Boucenna, N Haba, N Kauer, P Sorensen, RS Chivukula, S Chang, S Chang, S Yellin, T Aaltonen, T Aaltonen, T Hambye, T Plehn, T Sjöstrand, TR Slatyer, V Cirigliano, V Silveira, VM Abazov, VM Abazov, Y Bai, Y Grossman, Y Kajiyama, Z Ligeti, Z Ligeti   +82 more
core   +1 more source

Impact crater lake evolution and concomitant hydrothermal mineralization recorded by the Wörnitzostheim drill core at the Ries impact structure, Germany

Meteoritics &Planetary Science, EarlyView.
Abstract Impact‐generated hydrothermal systems and postimpact crater lake systems are well‐documented geological phenomena; however, evidence of hydrothermal venting into impact crater lake systems has rarely been reported. We investigated the well‐preserved contact between hydrothermally altered impact melt‐bearing breccia (outer/surficial suevite ...
Matthew J. O. Svensson, Gordon R. Osinski, Fred J. Longstaffe, Timothy A. Goudge, Haley M. Sapers   +4 more
wiley   +1 more source

Analytic study of dark photon and gravitational wave production from axion

Journal of High Energy Physics, 2021
Axion-like fields heavier than about 10 −27 eV are expected to oscillate in the radiation dominated epoch when the Hubble parameter drops below their mass.
Borna Salehian, Mohammad Ali Gorji, Shinji Mukohyama, Hassan Firouzjahi   +3 more
doaj   +1 more source

What are the Building Blocks of Our Universe? [PDF]

, 2004
We are told that we are living in a Golden Age of Astronomy. Cosmological Parameters are found with un precedented accuracy. Yet, the known form of matter forms only a small fraction of the total energy density of the universe.
Wali, Kameshwar C.
core   +2 more sources

Conformal transformations and Nordstr\"om's scalar theory of gravity

, 2010
As we shall briefly recall, Nordstr\"om's theory of gravity is observationally ruled out. It is however an interesting example of non-minimal coupling of matter to gravity and of the role of conformal transformations.
Deruelle, Nathalie, Sasaki, Misao
core   +1 more source

Microfaults: Abundant shear deformation and frictional melting in chondrites

Meteoritics &Planetary Science, EarlyView.
Abstract The majority of ordinary chondrite (OC) meteorites record some amount of textural evidence for impact‐induced deformation. Melt veins in some shocked samples have been compared to terrestrial impact‐related pseudotachylites, which form by frictional melting of host rock.
Craig R. Walton, Mahesh Anand, Maria Schönbächler   +2 more
wiley   +1 more source