Results 91 to 100 of about 21,702 (168)

BBN constraints on universally-coupled ultralight scalar dark matter

Journal of High Energy Physics, 2020
Ultralight scalar dark matter can interact with all massive Standard Model particles through a universal coupling. Such a coupling modifies the Standard Model particle masses and affects the dynamics of Big Bang Nucleosynthesis. We model the cosmological
Sergey Sibiryakov, Philip Sørensen, Tien-Tien Yu   +2 more
doaj   +1 more source

The hierarchy problem and the cosmological constant problem in the Standard Model

, 2015
We argue that the SM in the Higgs phase does not suffer form a "hierarchy problem" and that similarly the "cosmological constant problem" resolves itself if we understand the SM as a low energy effective theory emerging from a cut-off medium at the ...
Jegerlehner, Fred
core  

The cosmology of minimal varying Lambda theories

, 2019
Inserting a varying Lambda in Einstein's field equations can be made consistent with the Bianchi identities by allowing for torsion, without the need to add scalar field degrees of freedom.
Alexander, Stephon, Cortês, Marina, Liddle, Andrew R., Magueijo, João, Sims, Robert, Smolin, Lee   +5 more
core   +1 more source

Dark radiation and superheavy dark matter from black hole domination

Journal of High Energy Physics, 2019
If even a relatively small number of black holes were created in the early universe, they will constitute an increasingly large fraction of the total energy density as space expands.
Dan Hooper, Gordan Krnjaic, Samuel D. McDermott   +2 more
doaj   +1 more source

Modified Gravity and Dark Energy models Beyond $w(z)$CDM Testable by LSST [PDF]

, 2019
One of the main science goals of the Large Synoptic Survey Telescope (LSST) is to uncover the nature of cosmic acceleration. In the base analysis, possible deviations from the Lambda-Cold-Dark-Matter ($\Lambda$CDM) background evolution will be probed by ...
Baker, Tessa, Blazek, Jonathan, Bull, Philip, Ferreira, Pedro G., Ishak, Mustapha, Leonard, C. Danielle, Lin, Weikang, Linder, Eric, Pardo, Kris, Pedersen, Eske M., Valogiannis, Georgios   +10 more
core   +1 more source

Augury of darkness: the low-mass dark Z ′ portal

Journal of High Energy Physics, 2017
Dirac fermion dark matter models with heavy Z ′ mediators are subject to stringent constraints from spin-independent direct searches and from LHC bounds, cornering them to live near the Z ′ resonance.
Alexandre Alves, Giorgio Arcadi, Yann Mambrini, Stefano Profumo, Farinaldo S. Queiroz   +4 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

Neutrino communication, intergalactic transit, and Astrobiology. [PDF]

Bioinformation, 2022
Shapshak P.
europepmc   +1 more source

Gravitational Equivalence Theorem and Double-Copy for Kaluza-Klein Graviton Scattering Amplitudes. [PDF]

Research (Wash D C), 2022
Hang YF, He HJ.
europepmc   +1 more source

Gravitationally induced decoherence vs space-time diffusion: testing the quantum nature of gravity. [PDF]

Nat Commun, 2023
Oppenheim J, Sparaciari C, Šoda B, Weller-Davies Z.   +3 more
europepmc   +1 more source