We propose a novel enhancement mechanism of the curvature perturbations in nonminimal derivative coupling inflation model with parameter related to inflaton field. By considering special form as function inflaton, period ultra-slow-roll can be realized due gravitationally enhanced friction, and resulting power spectrum has sharp peak, which is large enough produce primordial black holes. Under this mechanism, we easily obtain mass holes around specific masses such $\mathcal{O}(10)\text{...

Recent observations from several pulsar timing array (PTA) collaborations have unveiled compelling evidence for a stochastic signal in the nanohertz band. This aligns remarkably with gravitational wave (GW) background, potentially originating first-order color charge confinement phase transition. Distinct quantum chromodynamics (QCD) matters, such as quarks or gluons, and diverse transition processes thereof can yield disparate GW energy density spectra. In this paper, employing Bayesian...

We study the thermodynamics and thermodynamic geometry of a five-dimensional Reissner-Nordstr\"om-AdS black hole in extended phase space by treating cosmological constant as being related to number colors boundary gauge theory its conjugate quantity associated chemical potential. find that contribution charge potential is always positive, existence makes become positive more easily. calculate scalar curvatures thermodynamical Weinhold metric, Ruppeiner Quevedo respectively, fixed ${N}^{2}$...

We study the thermodynamics and thermodynamic geometry of a five-dimensional Schwarzschild AdS black hole in 5 × S spacetime by treating cosmological constant as number colors boundary gauge theory its conjugate quantity associated chemical potential. It is found that potential always negative stable branch it has chance to be positive, but appears unstable branch. calculate scalar curvatures thermodynamical Weinhold metric, Ruppeiner metric Quevedo respectively we find curvature vanishing,...

We study the scalar induced gravitational wave (GW) background in inflation with gravitationally enhanced friction (GEF). The GEF mechanism, which is realized by assuming a nonminimal derivative coupling between inflaton field and gravity, used to amplify small-scale curvature perturbations generate sizable amount of primordial black holes. find that GW energy spectra can reach detectable scopes future projects, power spectrum has power-law form vicinity peak. scaling ultraviolet regions two...

In this Letter, by reconstructing the $Om$ diagnostic and deceleration parameter $q$ from latest Union2 Type Ia supernova sample with without systematic error along baryon acoustic oscillation (BAO) cosmic microwave background (CMB), we study expanding history, using Chevallier-Polarski-Linder (CPL) parametrization. We obtain that Union2+BAO favor an expansion a decreasing of acceleration at $z<0.3$. However, once CMB data is added in analysis, found to be still increasing, indicating...

We study, in the paradigm of open quantum systems, entanglement dynamics two uniformly accelerated atoms with same acceleration perpendicular to separation. The two-atom system is treated as an coupled a bath fluctuating massless scalar fields Minkowski vacuum, and master equation that governs its evolution derived. It has been found that, for nonvanishing separation, sudden death general feature when initial state entangled, while those separable state, birth only happens appropriate...

We propose a new single field inflation model in which the usual slow-roll is joined to period of slow-climb and through short intermediate non-inflationary phase. then show that primordial curvature perturbations can be enhanced at small scales, sizable amount black holes (PBHs) produced make up most dark matter, gravitational waves (GWs) induced by scalar metric accompany with formation PBHs detectable future GW experiments, last but not least, our compatible latest cosmic microwave...

Recently, an indicative evidence of a stochastic process, reported by the NANOGrav Collaboration based on analysis 12.5-year pulsar timing array data which might be interpreted as potential gravitational wave signal, has aroused keen interest theorists. The first-order color charge confinement phase transition at QCD scale could one cosmological sources for signal. If is flavor dependent and happens sequentially, it important to find that what kind matter in confinement/deconfinement more...

We explore whether acceleration assists entanglement harvesting for a pair of uniformly accelerated detectors in three different scenarios, i.e., parallel, antiparallel and mutually perpendicular acceleration, both the sense harvested harvesting-achievable separation between two detectors. Within framework protocols Unruh-DeWitt model locally interacting with massless scalar fields via Gaussian switching function an interaction duration parameter, we find that, harvested, is mixed blessing...

We establish a cosmological-model-independent method to determine the Hubble constant $H_0$ from localized fast radio bursts (FRBs) and parameter measurements cosmic chronometers obtain first such determination $H_0=71\pm 3~\mathrm{km/s/Mpc}$, with an uncertainty of 4\%, eighteen FRBs nineteen in redshift range $0<z\leq0.66$. This value, which is independent cosmological model, consistent results nearby type Ia supernovae (SN Ia) data calibrated by Cepheids Planck microwave background...

In this paper, we introduce a weak, transient and periodical derivative coupling between the inflaton field gravity, find that square of sound speed curvature perturbations becomes periodic function, which results in equation can be transformed into form Mathieu sub-horizon limit. Thus, parametric resonance will amplify so as to generate formation abundant primordial black holes (PBHs). We show generated PBHs make up most dark matter. Associated with generation PBHs, large scalar give rise...

We establish a cosmological-model-independent method to extract the apparent magnitude and its derivative at different redshifts from $\mathrm{Pantheon}+$ type Ia supernova sample find that obtained values deviate clearly prediction of $\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$ model lowest redshift. This deviation can be explained as result transition absolute $M$ in low-redshift region. The observations seem favor this transition, since minimum ${\ensuremath{\chi}}^{2}$ for two Ans\"atze...

We perform a cosmological-model-independent test for the distance–duality (DD) relation η(z) = DL(z)(1 + z)−2/DA(z), where DL and DA are luminosity distance angular diameter distance, respectively, with combination of observational data taken from latest Union2 SNe Ia that provided by two galaxy cluster samples compiled De Filippis et al. Bonamente Two parameterizations η(z), i.e., 1 η0z η0z/(1 z), used. find DD can be accommodated at 1σ confidence level (CL) sample 3σ CL sample. also...

We study thermodynamics of the four-dimensional Kerr-Sen-AdS black hole and its ultra-spinning counterpart, verify that both holes fullfil first law Bekenstein-Smarr mass formulae thermodynamics. Furthermore, we derive new Christodoulou-Ruffini-like squared-mass for usual Kerr-Sen-AdS$_4$ solutions. show this does not always violate Reverse Isoperimetric Inequality (RII) since value isoperimetric ratio can be larger/smaller than, or equal to unity, depending upon where solution parameters...

Using a reasonable choice in normalizing the timelike Killing vector, we investigate thermodynamic properties of charged accelerating Anti-de Sitter (AdS) black holes. We find that expression mass first law thermodynamics displays an inextricably intertwining behavior with charge due to unusual asymptotic structure Meanwhile, length as potential conjugate varying cosmic string tension is introduced and analyzed detail, possible phase holes also discussed standard analysis. Furthermore,...

We study, in the framework of entanglement harvesting protocol, both a pair inertial and uniformly accelerated detectors locally interacting with vacuum massless scalar fields subjected to perfectly reflecting plane boundary. find that presence boundary generally degrades harvested when two are very close However, distance between becomes comparable interaction duration parameter, amount approaches peak, which even goes beyond without Remarkably, parameter space detectors' separation...

We investigate the dynamics of giant atom(s) in a waveguide QED scenario, where atom couples to coupled resonator via two sites. For single setup, we find that atomic dissipation rate can be adjusted by tuning its size. atoms system, will induce controllable individual and collective as well effective inter-atom coupling. As result, theoretically realize robust entangled state preparation non-reciprocal excitation evolution. hope our study applied quantum information processing based on...

We explore some (especially, thermodynamical) properties of the dyonic Kerr-Sen-${\mathrm{AdS}}_{4}$ black hole and its ultraspinning counterpart, check whether or not both holes satisfy first law Bekenstein-Smarr mass formulas. To this end, new Christodoulou-Ruffini-like squared-mass formulas for usual solution cousin are deduced. Similar to case, we demonstrate that does always violate reverse isoperimetric inequality (RII) since value ratio can either be larger/smaller than, equal unity,...

In this paper, we obtain two improved Amati correlations of the Gamma-Ray burst (GRB) data via a powerful statistical tool called copula. After calibrating, with low-redshift GRB data, based on fiducial $\Lambda$CDM model $\Omega_\mathrm{m0}=0.3$ and $H_0=70~\mathrm{km~s^{-1}Mpc^{-1}}$, extrapolating results to high-redshift Hubble diagram points. Applying these constrain model, find that correlation from copula can give result well consistent $\Omega_\mathrm{m0}=0.3$, while standard...

We make a detailed comparison between entanglement harvesting for uniformly accelerated detectors in vacuum and static ones thermal bath at the Unruh temperature find that, small energy gap relative to Heisenberg of detectors, can harvest more possess comparatively larger harvesting-achievable range than ones; however, as grows sufficiently large, are instead likely relatively inertial bath. In with vacuum, there exist phenomena acceleration-assisted but never that thermal-noise-assisted...