scholarly journals Model-independent features of gravitational waves from bubble collisions

2021 ◽  
Vol 104 (12) ◽  
Author(s):  
Ariel Mégevand ◽  
Federico Agustín Membiela
Keyword(s):  
Gravitational Waves ◽  
Model Independent ◽  
Independent Features

scholarly journals Massive Gravitational Waves from Black Hole Inspirals in Quantum Gravity

2018 ◽  
Vol 191 ◽  
pp. 07003
Author(s):  
Xavier Calmet ◽  
Boris Latosh
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Quantum Gravity ◽  
Gravitational Waves ◽  
Emission Rate ◽  
New States ◽  
Model Independent ◽  
Classical Fields ◽  
Using Data

We show that alongside the already observed gravitational waves, quantum gravity predicts the existence of two additional massive classical fields and thus two new massive waves. We set a limit on their masses using data from Eöt-Wash-like experiments. We point out that the existence of these new states is a model independent prediction of quantum gravity. We explain how these new classical fields could impact astrophysical processes and in particular the binary inspirals of black holes. We calculate the emission rate of these new states in binary inspirals astrophysical processes.

scholarly journals $$\mu PT$$ statistical ensemble: systems with fluctuating energy, particle number, and volume

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ugo Marzolino
Keyword(s):  
Partition Function ◽  
Particle Number ◽  
Mean Field ◽  
Statistical Ensemble ◽  
Energy Particle ◽  
Ensemble Equivalence ◽  
Ideal Gases ◽  
Model Independent ◽  
Independent Features ◽  
Ensemble Systems

AbstractWithin the theory of statistical ensemble, the so-called $$\mu PT$$ μ P T ensemble describes equilibrium systems that exchange energy, particles, and volume with the surrounding. General, model-independent features of volume and particle number statistics are derived. Non-analytic points of the partition function are discussed in connection with divergent fluctuations and ensemble equivalence. Quantum and classical ideal gases, and a model of Bose gas with mean-field interactions are discussed as examples of the above considerations.

scholarly journals A model-independent constraint on the Hubble constant with gravitational waves from the Einstein Telescope

2020 ◽  
Vol 29 (15) ◽  
pp. 2050105
Author(s):  
Sixuan Zhang ◽  
Shuo Cao ◽  
Jia Zhang ◽  
Tonghua Liu ◽  
Yuting Liu ◽  
...  
Keyword(s):  
Cosmological Model ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Simulated Data ◽  
Hubble Constant ◽  
Host Galaxies ◽  
Local Universe ◽  
Binary Neutron Star ◽  
Einstein Telescope ◽  
Model Independent

In this paper, we investigate the expected constraints on the Hubble constant from the gravitational-wave standard sirens, in a cosmological-model-independent way. In the framework of the well-known Hubble law, the GW signal from each detected binary merger in the local universe ([Formula: see text]) provides a measurement of luminosity distance [Formula: see text] and thus the Hubble constant [Formula: see text]. Focusing on the simulated data of gravitational waves from the third-generation gravitational wave detector (the Einstein Telescope, ET), combined with the redshifts determined from electromagnetic counter parts and host galaxies, one can expect the Hubble constant to be constrained at the precision of [Formula: see text] with 20 well-observed binary neutron star (BNS) mergers. Additional standard-siren measurements from other types of future gravitational-wave sources (NS-BH and BBH) will provide more precision constraints of this important cosmological parameter. Therefore, we obtain that future measurements of the luminosity distances of gravitational waves sources will be much more competitive than the current analysis, which makes it expectable more vigorous and convincing constraints on the Hubble constant in a cosmological-model-independent way.

scholarly journals Primordial gravitational waves spectrum in the Coupled-Scalar-Tachyon Bounce Universe

2020 ◽  
Vol 80 (2) ◽  
Author(s):  
Nan Zhang ◽  
Yeuk-Kwan E. Cheung
Keyword(s):  
Gravitational Wave ◽  
Gravitational Waves ◽  
Wave Equations ◽  
Present Model ◽  
Equations Of Motion ◽  
Matching Conditions ◽  
Primordial Gravitational Waves ◽  
Before And After ◽  
Model Independent ◽  
Single Field

Abstract We extend our study on the Coupled-Scalar-Tachyon Bounce Universe to obtain its gravitational waves spectrum. We derive in detail the equations of motion for the tensorial modes of primordial metric perturbations in the Coupled-Scalar-Tachyon Bounce Universe. We solve for the gravitational wave equations in the pre-bounce contraction and the post-bounce expansion epochs. To match the solutions of the tensor perturbations, we idealise the bounce process yet retaining the essential physical properties of the bounce universe. We put forward two matching conditions: one ensures the continuity of the gravitational wave functions and the other respects the symmetric nature of the bounce dynamics. The matching conditions connect the two independent modes of gravitational waves solutions before and after the bounce. We further analyze the scale dependence and time dependence of the gravitational waves spectra in the bounce universe and compare them with the primordial spectrum in the single field inflation scenario. We discuss the implications to early universe physics and present model independent observational signatures extracted from the bounce universe.

scholarly journals HEAVY ANTIQUARK PENTAQUARKS IN THE CM AND GB MODELS

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1977-1980 ◽  
Author(s):  
KIM MALTMAN
Keyword(s):  
Goldstone Boson ◽  
Exchange Model ◽  
Positive Parity ◽  
Magnetic Exchange ◽  
Boson Exchange ◽  
Model Independent ◽  
Independent Features

The splittings between positive parity pentaquarks containing a single heavy (c, b) antiquark and four light (u, d) quarks are investigated in models having spin-dependent interactions generated by either effective Goldstone boson exchange or effective color magnetic exchange. Model-independent features of these splittings are emphasized. Overlaps to the "fall-apart" decay configurations ND, ND* or NB, NB*, relevant to decay couplings for the various 2-body pentaquark decays, are also computed.

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