Big Bounce Genesis and Possible Experimental Tests: A Brief Review

Cheung, Yeuk-Kwan E.; Li, Changhong; Vergados, J.D.

doi:10.3390/sym8110136

Cited by 9 publications

(8 citation statements)

References 130 publications

(209 reference statements)

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“…Meanwhile particle physics experiments aiming at direct detections of dark matter and determination of their coupling with Standard Model particles are in full swing. As bounce universe allows an out of thermal equilibrium route of dark matter creation in the contraction phase, dark matter mass and their coupling are constrained by the present-day relic abundance [25,40,41]. One may be in for surprise earlier than expected, as it provides a way to distinguish inflation [62] from a bounce universe.…”

Section: Resultsmentioning

confidence: 99%

“…In [37] we obtained the primordial spectrum of the scalar perturbations and established its scale invariance and its stability under time evolution. In the latter series of work [25,[38][39][40][41] we undertook a model independent study of dark matter creation and evolution in a bounce universe. We were able to extract a characteristic curve relating dark matter coupling and dark matter mass should the production of the dark matter take place via an out-of-thermalequilibrium route in a bounce universe.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Cheung

2020

Eur. Phys. J. C

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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 analyse 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.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Zhang

Cheung

2020

Eur. Phys. J. C

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“…The CSTB cosmos undergoes a period of tachyon matter dominated contraction in which a stable and scale invariant spectrum of primordial density perturbations is produced [31,32]. The model has a signature out-ofthermal-equilibrium production of dark matter which can be tested by the future array of dark matter detections [33][34][35][36][37], independently of cosmological observations [44]. Exploration on matter production and baryon asymmetry genesis is well underway [42,43].…”

Section: Discussionmentioning

confidence: 99%

“…It thus motivates us to investigate bounce universe models further and derive testable predictions in a model-independent manner. Dark matter creation and evolution is studied in the bounce universe [33][34][35][36][37]. When sufficient dark matter particles are not produced to reach kinematic equilibrium during contraction, relic abundance in the present universe then imposes a constraint on the dark matter mass and coupling constant.…”

Section: Introductionmentioning

confidence: 99%

The CST bounce universe model — A parametric study

Cheung

Song

et al. 2018

Sci. China Phys. Mech. Astron.

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A bounce universe model with a scale-invariant and stable spectrum of primordial density perturbations was constructed using a consistent truncation of the D-brane dynamics from Type IIB string theory. A coupling was introduced between the tachyon field and the adjoint Higgs field on the D3-branes to lock the tachyon at the top of its potential hill and to model the bounce process, which is known as the Coupled Scalar and Tachyon Bounce (CSTB) Universe. The CSTB model has been shown to be ghost free, and it fulfils the null energy condition; in addition, it can also solve the Big Bang cosmic singularity problem. In this paper we conduct an extensive follow-up study of the parameter space of the CSTB model. In particular we are interested in the parameter values that can produce a single bounce to arrive at a radiation-dominated universe. We further establish that the CSTB universe is a viable alternative to inflation, as it can naturally produce a sufficient number of e-foldings in the locked inflation epoch and in the post-bounce expansion to overcome the four fundamental limitations of the Big Bang cosmology, which are flatness, horizon, homogeneity and singularity, resulting in a universe of the current size.bounce universe, big bang singularity, tachyon inflation, flatness and horizon problems PACS number(s): 11.25. Uv, 11.25.Mj, 11.25.Wx, 98.80.k, 98.80.Cq

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“…When matter changes from gas form to heat or liquid or solid, the constant factor is the existence of the fundamental particles (I-particle), and the change is The Big Bounce theory [27] [28], another cosmological theory, says that the universe is expanding and contracting. Materials with high density contract explode and move apart.…”

Section: The I-theory and Big Bangmentioning

confidence: 99%

I-Theory: A Unifying Quantum Theory?

Isa¹,

Dumas²

2019

JHEPGC

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This paper gives an overview of a new theory called the "I-Theory", in the context of several accepted theories in physics and cosmology. This paper reviews the salient features of the "I-Theory", which introduces new particles like I, S ∞ and A 1 particles and provides a fuller understanding about Dark Matter, Dark Energy, Matter/Anti Matter and the four fundamental forces. "I-Theory" introduces a new concept of the "quality" of energy with White, Black and Red matter formed with regard to the frequency level of the energy vibration. The authors discuss the main features and controversies of the Standard Model, General Relativity, Big Bang, and Supersymmetry and attempt to answer some of the unsolved questions. It is proposed that the "I-Theory" can successfully encompass all major theories and thereby becomes the theory of the whole, the Unifying Theory.

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Big Bounce Genesis and Possible Experimental Tests: A Brief Review

Cited by 9 publications

References 130 publications

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

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

The CST bounce universe model — A parametric study

I-Theory: A Unifying Quantum Theory?

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