Zobrazeno 1 - 10
of 866
pro vyhledávání: '"Caldwell, R. A."'
Autor:
Caldwell, R. R., Devulder, C.
Publikováno v:
Phys. Rev. D 100, 103510 (2019)
We show that astrophysical gravitational waves can undergo an anomalous modulation when propagating through cosmic gauge field dark energy. A sufficiently strong effect, dependent on the gauge field energy density, would appear as a redshift-dependen
Externí odkaz:
http://arxiv.org/abs/1802.07371
Autor:
Caldwell, R. R., Devulder, C.
Publikováno v:
Phys. Rev. D 97, 023532 (2018)
We present a toy model of an axion gauge field inflation scenario that yields viable density and gravitational wave spectra. The scenario consists of an axionic inflaton in a steep potential that is effectively flattened by a coupling to a collection
Externí odkaz:
http://arxiv.org/abs/1706.03765
The dynamics of a gravitational wave propagating through a cosmic gauge field are dramatically different than in vacuum. We show that a gravitational wave acquires an effective mass, is birefringent, and its normal modes are a linear combination of g
Externí odkaz:
http://arxiv.org/abs/1706.00431
Autor:
Shosha, Esraa, Fouda, Abdelrahman Y., Lemtalsi, Tahira, Haigh, Stephen, Fulton, David, Ibrahim, Ahmed, Al-Shabrawey, Mohamed, Caldwell, R. William, Caldwell, Ruth B.
Publikováno v:
In Molecular Metabolism November 2021 53
Publikováno v:
Phys. Rev. D 94, 063005 (2016)
Gravitational waves propagating through a stationary gauge field transform into gauge field waves and back again. When multiple families of flavor-space locked gauge fields are present, the gravitational and gauge field waves exhibit novel dynamics.
Externí odkaz:
http://arxiv.org/abs/1604.08939
Autor:
Caldwell, R. R., Maksimova, N. A.
The spectral distortion of the cosmic microwave background blackbody spectrum in a radially inhomogeneous spacetime, designed to exactly reproduce a LambdaCDM expansion history along the past light cone, is shown to exceed the upper bound established
Externí odkaz:
http://arxiv.org/abs/1309.4454
Autor:
Yu, P. P., Caldwell, R. R.
The observer dependence of the quasi-local energy (QLE) and momentum in the Schwarzschild geometry is illustrated. Using the Brown-York prescription, the QLE for families of non-geodesic and geodesic observers penetrating the event horizon is obtaine
Externí odkaz:
http://arxiv.org/abs/0801.3683
Autor:
Caldwell, R. R., Stebbins, A.
Publikováno v:
Phys.Rev.Lett.100:191302,2008
The blackbody nature of the cosmic microwave background (CMB) radiation spectrum is used in a modern test of the Copernican Principle. The reionized universe serves as a mirror to reflect CMB photons, thereby permitting a view of ourselves and the lo
Externí odkaz:
http://arxiv.org/abs/0711.3459
Autor:
Michney, R. J., Caldwell, R. R.
Publikováno v:
JCAP 0701:014,2007
The cosmic neutrino background (CNB) consists of low-energy relic neutrinos which decoupled from the cosmological fluid at a redshift z ~ 10^{10}. Despite being the second-most abundant particles in the universe, direct observation remains a distant
Externí odkaz:
http://arxiv.org/abs/astro-ph/0608303
Autor:
Caldwell, R. R., Grin, Daniel
Publikováno v:
Phys.Rev.Lett.100:031301,2008
We consider a linearized, effective quantum theory of gravitation in which gravity weakens at energies higher than ~10^-3 eV in order to accommodate the apparent smallness of the cosmological constant. Such a theory predicts departures from the stati
Externí odkaz:
http://arxiv.org/abs/astro-ph/0606133