scholarly journals Inflationary physics and trans-Planckian conjecture in the stringy running vacuum model: from the phantom vacuum to the true vacuum

2021 ◽  
Vol 136 (11) ◽  
Author(s):  
Nick E. Mavromatos ◽  
Joan Solà Peracaula
Keyword(s):  
Vacuum Model ◽  
True Vacuum

scholarly journals POSSIBILITY OF FORMING A LARGE DCC IN ULTRA-RELATIVISTIC HEAVY-ION COLLISIONS

2000 ◽  
Vol 15 (15) ◽  
pp. 2269-2288
Author(s):  
SANATAN DIGAL ◽  
RAJARSHI RAY ◽  
SUPRATIM SENGUPTA ◽  
AJIT M. SRIVASTAVA
Keyword(s):  
Three Dimensional ◽  
Thermal Fluctuations ◽  
Heavy Ion ◽  
High Energy ◽  
Chiral Condensate ◽  
Relativistic Heavy Ion Collisions ◽  
Maximum Temperature ◽  
Chiral Field ◽  
Heavy Nuclei ◽  
True Vacuum

We demonstrate the possibility of forming a single, large domain of disoriented chiral condensate (DCC) in a heavy-ion collision. In our scenario, rapid initial heating of the parton system provides a driving force for the chiral field, moving it away from the true vacuum and forcing it to go to the opposite point on the vacuum manifold. This converts the entire hot region into a single DCC domain. Subsequent rolling down of the chiral field to its true vacuum will then lead to emission of a large number of (approximately) coherent pions. The requirement of suppression of thermal fluctuations to maintain the (approximate) coherence of such a large DCC domain, favors three-dimensional expansion of the plasma over the longitudinal expansion even at very early stages of evolution. This also constrains the maximum temperature of the system to lie within a window. We roughly estimate this window to be about 200–400 MeV. These results lead us to predict that extremely high energy collisions of very small nuclei (possibly hadrons) are better suited for observing signatures of a large DCC. Another possibility is to focus on peripheral collisions of heavy nuclei.

Exact Bianchi type-V vacuum model

1983 ◽  
Vol 15 (11) ◽  
pp. 1067-1076 ◽  
Author(s):  
B. K. Nayak
Keyword(s):  
Bianchi Type ◽  
Vacuum Model ◽  
Type V ◽  
Bianchi Type V

scholarly journals Worldline numerics applied to custom Casimir geometry generates unanticipated intersection with Alcubierre warp metric

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
Harold White ◽  
Jerry Vera ◽  
Arum Han ◽  
Alexander R. Bruccoleri ◽  
Jonathan MacArthur
Keyword(s):  
Energy Density ◽  
Three Dimensional ◽  
Casimir Energy ◽  
Negative Energy ◽  
Vacuum Model ◽  
Energy Density Distribution ◽  
Dynamic Vacuum ◽  
Negative Energy Density ◽  
Funded Project ◽  
Transient Electric Field

AbstractWhile conducting analysis related to a DARPA-funded project to evaluate possible structure of the energy density present in a Casimir cavity as predicted by the dynamic vacuum model, a micro/nano-scale structure has been discovered that predicts negative energy density distribution that closely matches requirements for the Alcubierre metric. The simplest notional geometry being analyzed as part of the DARPA-funded work consists of a standard parallel plate Casimir cavity equipped with pillars arrayed along the cavity mid-plane with the purpose of detecting a transient electric field arising from vacuum polarization conjectured to occur along the midplane of the cavity. An analytic technique called worldline numerics was adapted to numerically assess vacuum response to the custom Casimir cavity, and these numerical analysis results were observed to be qualitatively quite similar to a two-dimensional representation of energy density requirements for the Alcubierre warp metric. Subsequently, a toy model consisting of a 1 $$\upmu $$ μ m diameter sphere centrally located in a 4 $$\upmu $$ μ m diameter cylinder was analyzed to show a three-dimensional Casimir energy density that correlates well with the Alcubierre warp metric requirements. This qualitative correlation would suggest that chip-scale experiments might be explored to attempt to measure tiny signatures illustrative of the presence of the conjectured phenomenon: a real, albeit humble, warp bubble.

scholarly journals Dynamical gluon mass at nonzero temperature in instanton vacuum model

2019 ◽  
Vol 99 (7) ◽  
Author(s):  
M. Musakhanov ◽  
Sh. Baratov ◽  
N. Rakhimov
Keyword(s):  
Nonzero Temperature ◽  
Vacuum Model ◽  
Gluon Mass ◽  
Instanton Vacuum

scholarly journals Interacting vacuum at infinity

2019 ◽  
Vol 16 (04) ◽  
pp. 1950052
Author(s):  
G. Kittou
Keyword(s):  
Finite Time ◽  
Central Extension ◽  
Vacuum Model ◽  
Time Singularity ◽  
Attractor Solution ◽  
The One ◽  
Finite Time Singularity

We apply the central extension technique of Poincaré to dynamics involving an interacting mixture of pressureless matter and vacuum near a finite-time singularity. We show that the only attractor solution on the circle of infinity is the one describing a vanishing matter-vacuum model at early times.

scholarly journals Constraints on a special running vacuum model

2020 ◽  
Vol 80 (1) ◽  
Author(s):  
Chao-Qiang Geng ◽  
Chung-Chi Lee ◽  
Lu Yin
Keyword(s):  
Vacuum Model

Power law expansion of the early universe for a V (a) = kan potential

2018 ◽  
Vol 33 (01) ◽  
pp. 1850005
Author(s):  
Augusto S. Freitas
Keyword(s):  
Early Universe ◽  
Power Law ◽  
Analytical Solutions ◽  
Scale Factor ◽  
Rigorous Proof ◽  
Exponential Expansion ◽  
True Vacuum ◽  
Classical Potential ◽  
The Universe

In a recent paper, He, Gao and Cai [Phys. Rev. D 89, 083510 (2014)], found a rigorous proof, based on analytical solutions of the Wheeler–DeWitt (WDWE) equation, of the spontaneous creation of the universe from nothing. The solutions were obtained from a classical potential [Formula: see text], where [Formula: see text] is the scale factor. In this paper, we present a complementary (to that of He, Gao and Cai) solution to the WDWE equation with [Formula: see text]. I have found an exponential expansion of the true vacuum bubble for all scenarios. In all scenarios, we found a power law behavior of the scale factor result which is in agreement with another studies.

scholarly journals Heavy quarkonia: Wilson area law, stochastic vacuum model, and dual QCD

1997 ◽  
Vol 55 (7) ◽  
pp. 3974-3986 ◽  
Author(s):  
N. Brambilla ◽  
A. Vairo
Keyword(s):  
Heavy Quarkonia ◽  
Vacuum Model ◽  
Area Law

scholarly journals COLEMAN–DE LUCCIA TUNNELING AND THE GIBBONS–HAWKING TEMPERATURE

2010 ◽  
Vol 25 (05) ◽  
pp. 1019-1060 ◽  
Author(s):  
S.-H. HENRY TYE ◽  
DANIEL WOHNS ◽  
YANG ZHANG
Keyword(s):  
Quantum Tunneling ◽  
Field Potential ◽  
Thermal Fluctuation ◽  
Hawking Temperature ◽  
Vacuum Energy Density ◽  
Thin Wall ◽  
False Vacuum ◽  
De Sitter ◽  
Tunneling Process ◽  
True Vacuum

We study Coleman–de Luccia tunneling in some detail. We show that, for a single scalar field potential with a true and a false vacuum, there are four types of tunneling, depending on the properties of the potential. A general tunneling process involves a combination of thermal (Gibbons–Hawking temperature) fluctuation part way up the barrier followed by quantum tunneling. The thin-wall approximation is a special limit of the case (of only quantum tunneling) where inside the nucleation bubble is the true vacuum while the outside reaches the false vacuum. Hawking–Moss tunneling is the (only thermal fluctuation) limit of the case where the inside of the bubble does not reach the true vacuum at the moment of its creation, and the outside is cut off by the de Sitter horizon before it reaches the false vacuum. A typical tunneling process is a combination of thermal and quantum tunnelings. We estimate the tunneling rate for this case and find that the corrections to the Hawking–Moss formula can be large. In all cases, we see that the Euclidean action of the bounce decreases rapidly as the vacuum energy density increases, signaling that the tunneling is not exponentially suppressed. This phenomenon may be interpreted as a finite temperature effect due to the Gibbons–Hawking temperature of the de Sitter space. As an application, we discuss the implication of this tunneling property to the cosmic landscape.

scholarly journals Integrated Sachs-Wolfe effect in time varying vacuum model

2010 ◽  
Vol 81 (8) ◽  
Author(s):  
Y. T. Wang ◽  
Y. X. Gui ◽  
L. X. Xu ◽  
J. B. Lu
Keyword(s):  
Time Varying ◽  
Vacuum Model
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