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One of the goals of current cosmological studies is the determination of the expansion and acceleration rates of the universe as functions of redshift, and the determination of the properties of the dark energy that can explain these…

天体物理学 · 物理学 2009-11-10 Ruth A. Daly , S. G. Djorgovski

To achieve maximum planet yield for a given radial velocity survey, the observing strategy must be carefully considered. In particular, the adopted cadence can greatly affect the sensitivity to exoplanetary parameters such as period and…

天体物理学 · 物理学 2009-11-13 Stephen R. Kane , Eric B. Ford , Jian Ge

We report the first direct measurements of the very small effect of forced diurnal polar motion, successfully observed on three of our large ring lasers, which now measure the instantaneous direction of Earth's rotation axis to a precision…

地球物理 · 物理学 2007-05-23 K. U. Schreiber , A. Velikoseltsev , M. Rothacher , T. Klugel , G. E. Stedman , D. L. Wiltshire

The so-called principle of relativity is able to fix a general coordinate transformation which differs from the standard Lorentzian form only by an unknown speed which cannot in principle be identified with the light speed. Based on a…

综合物理 · 物理学 2017-09-21 J. A. S. Lima , F. D. Sasse

It will be shown that the rotation of the Earth in the Earth-Moon system can be detected by comparing the deflection of a Foucault pendulum at noon on the one hand and at midnight on the other hand. More precisely, on 21 June the midnight…

经典物理 · 物理学 2011-12-23 Bertrand M. Roehner

We express the position of the Sun in the sky as a function of time and the observer's geographic coordinates. Our method is based on applying rotation matrices to vectors describing points on the celestial sphere. We also derive direct…

科普物理 · 物理学 2013-04-02 Alejandro Jenkins

The scattering rate at dark-matter direct-detection experiments should modulate annually due to the Earth's orbit around the Sun. The rate is typically thought to be extremized around June 1, when the relative velocity of the Earth with…

宇宙学与河外天体物理 · 物理学 2014-02-03 Samuel K. Lee , Mariangela Lisanti , Annika H. G. Peter , Benjamin R. Safdi

Special relativity calculates, by means of the Lorentz gamma factor, the proper time of all inertial systems from the observer proper time, which is taken as a time standard. So, any temporal inference relies in first instance on the…

综合物理 · 物理学 2010-01-19 G. Sardin

I present a novel macroscopic wave geometric effect of the sunbeam occurring when the sunbeam directional (shadow by a bar) angle c velocity is observed on the earth surface and a sunbeam global positioning device with a needle at the…

综合物理 · 物理学 2009-11-02 Sang Boo Nam

The objective reality of the Earth's motion about the Sun was finally proven observationally by Bradley (1727) when he correctly explained the ~20'' annual, elliptical motions of stars as being due to aberration of starlight caused by the…

地球与行星天体物理 · 物理学 2018-09-05 Jason T. Wright

The yields from transit surveys can be used to constrain the frequency and statistical properties of extrasolar planets. Conversely, planet frequencies can be used to estimate expected detection rates, which are critical for the planning…

天体物理学 · 物理学 2007-05-23 B. Scott Gaudi

The Sun is expected to increase its radiant output by about 10% per billion years. The rate at which the radius of the Earth's orbit would need to increase in order to keep the present value of the Sun's radiant flux at the Earth constant…

科普物理 · 物理学 2017-11-27 Mark A. Wessels

Klioner et al. have used the Gaia EDR3 data to directly measure the solar system's acceleration within the Milky Way using the apparent proper motions of quasars. Here I show that this single absolute acceleration measurement in combination…

星系天体物理 · 物理学 2021-07-29 Jo Bovy

Direct detection experiments search for the interactions of Dark Matter (DM) particles with nuclei in terrestrial detectors. But if these interactions are sufficiently strong, DM particles may scatter in the Earth, affecting their…

高能物理 - 唯象学 · 物理学 2017-01-13 Bradley J. Kavanagh , Riccardo Catena , Chris Kouvaris

Minor bodies of the solar system can be used to measure the spectrum of the Sun as a star by observing sunlight reflected by their surfaces. To perform an accurate measurement of the radial velocity of the Sun as a star by this method, it…

太阳与恒星天体物理 · 物理学 2015-05-06 A. F. Lanza , P. Molaro

We measure the Sun's velocity with respect to the Galactic halo using Gaia Early Data Release 3 (EDR3) observations of stellar streams. Our method relies on the fact that, in low-mass streams, the proper motion of stars should be directed…

星系天体物理 · 物理学 2020-12-11 Khyati Malhan , Rodrigo A. Ibata , Nicolas F. Martin

We propose new estimates of the secular aberration drift, mainly due to the rotation of the Solar System about the Galactic center, based on up-to-date VLBI observations and and improved method of outlier elimination. We fit degree-2 vector…

天体物理仪器与方法 · 物理学 2015-06-17 O. Titov , S. Lambert

It is proved that in experiments on or near the Earth, no anisotropy in the one-way velocity of light may be detected. The very accurate experiments which have been performed to detect such an effect are to be considered significant tests…

广义相对论与量子宇宙学 · 物理学 2015-06-25 Bruno Preziosi

Among the different strategies aiming to detect WIMP dark matter (DM), a neutrino signal coming from the Sun would be a smoking gun. This possibility relies on the DM capture by the Sun driven by the local DM distribution assumptions: the…

星系天体物理 · 物理学 2019-12-18 A. Nuñez-Castiñeyra , E. Nezri , V. Bertin