Related papers: Ultra-high precision cosmology from gravitational …

Methods for the detection of gravitational waves from sub-solar mass ultracompact binaries

We describe detection methods for extensions of gravitational wave searches to sub-solar mass compact binaries. Sub-solar mass searches were previously carried out using Initial LIGO, and Advanced LIGO boasts a detection volume…

Instrumentation and Methods for Astrophysics · Physics 2018-12-05 Ryan Magee , Anne-Sylvie Deutsch , Phoebe McClincy , Chad Hanna , Christian Horst , Duncan Meacher , Cody Messick , Sarah Shandera , Madeline Wade

Revisiting holographic dark energy from the perspective of multi-messenger gravitational wave astronomy: future joint observations with short gamma-ray bursts

The advent of third-generation (3G) gravitational-wave (GW) detectors opens new opportunities for multi-messenger observations of binary neutron star merger events, holding significant potential for probing the history of cosmic expansion.…

Cosmology and Nongalactic Astrophysics · Physics 2025-03-07 Tao Han , Ze Li , Jing-Fei Zhang , Xin Zhang

Cosmological measurement of the gravitational constant $G$ using the CMB, the BAO and the BBN

Recent cosmological observations have provided numerous new observations with increasing precision that have led to the era of precision cosmology. The exquisite quality of these observations opens new possibilities towards measuring…

Cosmology and Nongalactic Astrophysics · Physics 2025-05-14 Brahim Lamine , Yacob Ozdalkiran , Louis Mirouze , Furkan Erdogan , Stéphane Ilic , Isaac Tutusaus , Raphael Kou , Alain Blanchard

Characterization of low-significance gravitational-wave compact binary sources

Advanced LIGO and Virgo have so far detected gravitational waves from 10 binary black hole mergers (BBH) and 1 binary neutron star merger (BNS). In the future, we expect the detection of many more marginal sources, since compact binary…

General Relativity and Quantum Cosmology · Physics 2019-01-03 Yiwen Huang , Hannah Middleton , Ken K. -Y. Ng , Salvatore Vitale , John Veitch

Bayesian framework to infer the Hubble constant from the cross-correlation of individual gravitational wave events with galaxies

Gravitational waves (GWs) from the inspiral of binary compact objects offer a one-step measurement of the luminosity distance to the event, which is essential for the measurement of the Hubble constant, $H_0$, which characterizes the…

Cosmology and Nongalactic Astrophysics · Physics 2025-03-10 Tathagata Ghosh , Surhud More , Sayantani Bera , Sukanta Bose

Parameter estimation for compact binary coalescence signals with the first generation gravitational-wave detector network

Compact binary systems with neutron stars or black holes are one of the most promising sources for ground-based gravitational wave detectors. Gravitational radiation encodes rich information about source physics; thus parameter estimation…

General Relativity and Quantum Cosmology · Physics 2013-12-02 the LIGO Scientific Collaboration , the Virgo Collaboration , J. Aasi , J. Abadie , B. P. Abbott , R. Abbott , T. D. Abbott , M. Abernathy , T. Accadia , F. Acernese , C. Adams , T. Adams , P. Addesso , R. Adhikari , C. Affeldt , M. Agathos , K. Agatsuma , P. Ajith , B. Allen , A. Allocca , E. Amador Ceron , D. Amariutei , S. B. Anderson , W. G. Anderson , K. Arai , M. C. Araya , S. Ast , S. M. Aston , P. Astone , D. Atkinson , P. Aufmuth , C. Aulbert , B. E. Aylott , S. Babak , P. Baker , G. Ballardin , S. Ballmer , Y. Bao , J. C. B. Barayoga , D. Barker , F. Barone , B. Barr , L. Barsotti , M. Barsuglia , M. A. Barton , I. Bartos , R. Bassiri , M. Bastarrika , A. Basti , J. Batch , J. Bauchrowitz , Th. S. Bauer , M. Bebronne , D. Beck , B. Behnke , M. Bejger , M. G. Beker , A. S. Bell , C. Bell , I. Belopolski , M. Benacquista , J. M. Berliner , A. Bertolini , J. Betzwieser , N. Beveridge , P. T. Beyersdorf , T. Bhadbade , I. A. Bilenko , G. Billingsley , J. Birch , R. Biswas , M. Bitossi , M. A. Bizouard , E. Black , J. K. Blackburn , L. Blackburn , D. Blair , B. Bland , M. Blom , O. Bock , T. P. Bodiya , C. Bogan , C. Bond , R. Bondarescu , F. Bondu , L. Bonelli , R. Bonnand , R. Bork , M. Born , V. Boschi , S. Bose , L. Bosi , B. Bouhou , S. Braccini , C. Bradaschia , P. R. Brady , V. B. Braginsky , M. Branchesi , J. E. Brau , J. Breyer , T. Briant , D. O. Bridges , A. Brillet , M. Brinkmann , V. Brisson , M. Britzger , A. F. Brooks , D. A. Brown , T. Bulik , H. J. Bulten , A. Buonanno , J. Burguet--Castell , D. Buskulic , C. Buy , R. L. Byer , L. Cadonati , G. Cagnoli , E. Calloni , J. B. Camp , P. Campsie , K. Cannon , B. Canuel , J. Cao , C. D. Capano , F. Carbognani , L. Carbone , S. Caride , S. Caudill , M. Cavaglià , F. Cavalier , R. Cavalieri , G. Cella , C. Cepeda , E. Cesarini , T. Chalermsongsak , P. Charlton , E. Chassande-Mottin , W. Chen , X. Chen , Y. Chen , A. Chincarini , A. Chiummo , H. S. Cho , J. Chow , N. Christensen , S. S. Y. Chua , C. T. Y. Chung , S. Chung , G. Ciani , F. Clara , D. E. Clark , J. A. Clark , J. H. Clayton , F. Cleva , E. Coccia , P. -F. Cohadon , C. N. Colacino , A. Colla , M. Colombini , A. Conte , R. Conte , D. Cook , T. R. Corbitt , M. Cordier , N. Cornish , A. Corsi , C. A. Costa , M. Coughlin , J. -P. Coulon , P. Couvares , D. M. Coward , M. Cowart , D. C. Coyne , J. D. E. Creighton , T. D. Creighton , A. M. Cruise , A. Cumming , L. Cunningham , E. Cuoco , R. M. Cutler , K. Dahl , M. Damjanic , S. L. Danilishin , S. D'Antonio , K. Danzmann , V. Dattilo , B. Daudert , H. Daveloza , M. Davier , E. J. Daw , T. Dayanga , R. De Rosa , D. DeBra , G. Debreczeni , J. Degallaix , W. Del Pozzo , T. Dent , V. Dergachev , R. DeRosa , S. Dhurandhar , L. Di Fiore , A. Di Lieto , I. Di Palma , M. Di Paolo Emilio , A. Di Virgilio , M. Díaz , A. Dietz , F. Donovan , K. L. Dooley , S. Doravari , S. Dorsher , M. Drago , R. W. P. Drever , J. C. Driggers , Z. Du , J. -C. Dumas , S. Dwyer , T. Eberle , M. Edgar , M. Edwards , A. Effler , P. Ehrens , G. Endröczi , R. Engel , T. Etzel , K. Evans , M. Evans , T. Evans , M. Factourovich , V. Fafone , S. Fairhurst , B. F. Farr , W. M. Farr , M. Favata , D. Fazi , H. Fehrmann , D. Feldbaum , F. Feroz , I. Ferrante , F. Ferrini , F. Fidecaro , L. S. Finn , I. Fiori , R. P. Fisher , R. Flaminio , S. Foley , E. Forsi , L. A. Forte , N. Fotopoulos , J. -D. Fournier , J. Franc , S. Franco , S. Frasca , F. Frasconi , M. Frede , M. A. Frei , Z. Frei , A. Freise , R. Frey , T. T. Fricke , D. Friedrich , P. Fritschel , V. V. Frolov , M. -K. Fujimoto , P. J. Fulda , M. Fyffe , J. Gair , M. Galimberti , L. Gammaitoni , J. Garcia , F. Garufi , M. E. Gáspár , G. Gelencser , G. Gemme , E. Genin , A. Gennai , L. Á. Gergely , S. Ghosh , J. A. Giaime , S. Giampanis , K. D. Giardina , A. Giazotto , S. Gil-Casanova , C. Gill , J. Gleason , E. Goetz , G. González , M. L. Gorodetsky , S. Goßler , R. Gouaty , C. Graef , P. B. Graff , M. Granata , A. Grant , C. Gray , R. J. S. Greenhalgh , A. M. Gretarsson , C. Griffo , H. Grote , K. Grover , S. Grunewald , G. M. Guidi , C. Guido , R. Gupta , E. K. Gustafson , R. Gustafson , J. M. Hallam , D. Hammer , G. Hammond , J. Hanks , C. Hanna , J. Hanson , J. Harms , G. M. Harry , I. W. Harry , E. D. Harstad , M. T. Hartman , C. -J. Haster , K. Haughian , K. Hayama , J. -F. Hayau , J. Heefner , A. Heidmann , M. C. Heintze , H. Heitmann , P. Hello , G. Hemming , M. A. Hendry , I. S. Heng , A. W. Heptonstall , V. Herrera , M. Heurs , M. Hewitson , S. Hild , D. Hoak , K. A. Hodge , K. Holt , M. Holtrop , T. Hong , S. Hooper , J. Hough , E. J. Howell , B. Hughey , S. Husa , S. H. Huttner , T. Huynh-Dinh , D. R. Ingram , R. Inta , T. Isogai , A. Ivanov , K. Izumi , M. Jacobson , E. James , Y. J. Jang , P. Jaranowski , E. Jesse , W. W. Johnson , D. I. Jones , R. Jones , R. J. G. Jonker , L. Ju , P. Kalmus , V. Kalogera , S. Kandhasamy , G. Kang , J. B. Kanner , M. Kasprzack , R. Kasturi , E. Katsavounidis , W. Katzman , H. Kaufer , K. Kaufman , K. Kawabe , S. Kawamura , F. Kawazoe , D. Keitel , D. Kelley , W. Kells , D. G. Keppel , Z. Keresztes , A. Khalaidovski , F. Y. Khalili , E. A. Khazanov , B. K. Kim , C. Kim , H. Kim , K. Kim , N. Kim , Y. M. Kim , P. J. King , D. L. Kinzel , J. S. Kissel , S. Klimenko , J. Kline , K. Kokeyama , V. Kondrashov , S. Koranda , W. Z. Korth , I. Kowalska , D. Kozak , V. Kringel , B. Krishnan , A. Królak , G. Kuehn , P. Kumar , R. Kumar , R. Kurdyumov , P. Kwee , P. K. Lam , M. Landry , A. Langley , B. Lantz , N. Lastzka , C. Lawrie , A. Lazzarini , A. Le Roux , P. Leaci , C. H. Lee , H. K. Lee , H. M. Lee , J. R. Leong , I. Leonor , N. Leroy , N. Letendre , V. Lhuillier , J. Li , T. G. F. Li , P. E. Lindquist , V. Litvine , Y. Liu , Z. Liu , N. A. Lockerbie , D. Lodhia , J. Logue , M. Lorenzini , V. Loriette , M. Lormand , G. Losurdo , J. Lough , M. Lubinski , H. Lück , A. P. Lundgren , J. Macarthur , E. Macdonald , B. Machenschalk , M. MacInnis , D. M. Macleod , M. Mageswaran , K. Mailand , E. Majorana , I. Maksimovic , V. Malvezzi , N. Man , I. Mandel , V. Mandic , M. Mantovani , F. Marchesoni , F. Marion , S. Márka , Z. Márka , A. Markosyan , E. Maros , J. Marque , F. Martelli , I. W. Martin , R. M. Martin , J. N. Marx , K. Mason , A. Masserot , F. Matichard , L. Matone , R. A. Matzner , N. Mavalvala , G. Mazzolo , R. McCarthy , D. E. McClelland , S. C. McGuire , G. McIntyre , J. McIver , G. D. Meadors , M. Mehmet , T. Meier , A. Melatos , A. C. Melissinos , G. Mendell , D. F. Menéndez , R. A. Mercer , S. Meshkov , C. Messenger , M. S. Meyer , H. Miao , C. Michel , L. Milano , J. Miller , Y. Minenkov , C. M. F. Mingarelli , V. P. Mitrofanov , G. Mitselmakher , R. Mittleman , B. Moe , M. Mohan , S. R. P. Mohapatra , D. Moraru , G. Moreno , N. Morgado , A. Morgia , T. Mori , S. R. Morriss , S. Mosca , K. Mossavi , B. Mours , C. M. Mow--Lowry , C. L. Mueller , G. Mueller , S. Mukherjee , A. Mullavey , H. Müller-Ebhardt , J. Munch , D. Murphy , P. G. Murray , A. Mytidis , T. Nash , L. Naticchioni , V. Necula , J. Nelson , I. Neri , G. Newton , T. Nguyen , A. Nishizawa , A. Nitz , F. Nocera , D. Nolting , M. E. Normandin , L. Nuttall , E. Ochsner , J. O'Dell , E. Oelker , G. H. Ogin , J. J. Oh , S. H. Oh , R. G. Oldenberg , B. O'Reilly , R. O'Shaughnessy , C. Osthelder , C. D. Ott , D. J. Ottaway , R. S. Ottens , H. Overmier , B. J. Owen , A. Page , L. Palladino , C. Palomba , Y. Pan , C. Pankow , F. Paoletti , R. Paoletti , M. A. Papa , M. Parisi , A. Pasqualetti , R. Passaquieti , D. Passuello , M. Pedraza , S. Penn , A. Perreca , G. Persichetti , M. Phelps , M. Pichot , M. Pickenpack , F. Piergiovanni , V. Pierro , M. Pihlaja , L. Pinard , I. M. Pinto , M. Pitkin , H. J. Pletsch , M. V. Plissi , R. Poggiani , J. Pöld , F. Postiglione , C. Poux , M. Prato , V. Predoi , T. Prestegard , L. R. Price , M. Prijatelj , M. Principe , S. Privitera , G. A. Prodi , L. G. Prokhorov , O. Puncken , M. Punturo , P. Puppo , V. Quetschke , R. Quitzow-James , F. J. Raab , D. S. Rabeling , I. Rácz , H. Radkins , P. Raffai , M. Rakhmanov , C. Ramet , B. Rankins , P. Rapagnani , V. Raymond , V. Re , C. M. Reed , T. Reed , T. Regimbau , S. Reid , D. H. Reitze , F. Ricci , R. Riesen , K. Riles , M. Roberts , N. A. Robertson , F. Robinet , C. Robinson , E. L. Robinson , A. Rocchi , S. Roddy , C. Rodriguez , M. Rodruck , L. Rolland , J. G. Rollins , R. Romano , J. H. Romie , D. Rosińska , C. Röver , S. Rowan , A. Rüdiger , P. Ruggi , K. Ryan , F. Salemi , L. Sammut , V. Sandberg , S. Sankar , V. Sannibale , L. Santamaría , I. Santiago-Prieto , G. Santostasi , E. Saracco , B. Sassolas , B. S. Sathyaprakash , P. R. Saulson , R. L. Savage , R. Schilling , R. Schnabel , R. M. S. Schofield , B. Schulz , B. F. Schutz , P. Schwinberg , J. Scott , S. M. Scott , F. Seifert , D. Sellers , D. Sentenac , A. Sergeev , D. A. Shaddock , M. Shaltev , B. Shapiro , P. Shawhan , D. H. Shoemaker , T. L Sidery , X. Siemens , D. Sigg , D. Simakov , A. Singer , L. Singer , A. M. Sintes , G. R. Skelton , B. J. J. Slagmolen , J. Slutsky , J. R. Smith , M. R. Smith , R. J. E. Smith , N. D. Smith-Lefebvre , K. Somiya , B. Sorazu , F. C. Speirits , L. Sperandio , M. Stefszky , E. Steinert , J. Steinlechner , S. Steinlechner , S. Steplewski , A. Stochino , R. Stone , K. A. Strain , S. E. Strigin , A. S. Stroeer , R. Sturani , A. L. Stuver , T. Z. Summerscales , M. Sung , S. Susmithan , P. J. Sutton , B. Swinkels , G. Szeifert , M. Tacca , L. Taffarello , D. Talukder , D. B. Tanner , S. P. Tarabrin , R. Taylor , A. P. M. ter Braack , P. Thomas , K. A. Thorne , K. S. Thorne , E. Thrane , A. Thüring , C. Titsler , K. V. Tokmakov , C. Tomlinson , A. Toncelli , M. Tonelli , O. Torre , C. V. Torres , C. I. Torrie , E. Tournefier , F. Travasso , G. Traylor , M. Tse , D. Ugolini , H. Vahlbruch , G. Vajente , J. F. J. van den Brand , C. Van Den Broeck , S. van der Putten , A. A. van Veggel , S. Vass , M. Vasuth , R. Vaulin , M. Vavoulidis , A. Vecchio , G. Vedovato , J. Veitch , P. J. Veitch , K. Venkateswara , D. Verkindt , F. Vetrano , A. Viceré , A. E. Villar , J. -Y. Vinet , S. Vitale , H. Vocca , C. Vorvick , S. P. Vyatchanin , A. Wade , L. Wade , M. Wade , S. J. Waldman , L. Wallace , Y. Wan , M. Wang , X. Wang , A. Wanner , R. L. Ward , M. Was , M. Weinert , A. J. Weinstein , R. Weiss , T. Welborn , L. Wen , P. Wessels , M. West , T. Westphal , K. Wette , J. T. Whelan , S. E. Whitcomb , D. J. White , B. F. Whiting , K. Wiesner , C. Wilkinson , P. A. Willems , L. Williams , R. Williams , B. Willke , M. Wimmer , L. Winkelmann , W. Winkler , C. C. Wipf , A. G. Wiseman , H. Wittel , G. Woan , R. Wooley , J. Worden , J. Yablon , I. Yakushin , H. Yamamoto , K. Yamamoto , C. C. Yancey , H. Yang , D. Yeaton-Massey , S. Yoshida , M. Yvert , A. Zadrożny , M. Zanolin , J. -P. Zendri , F. Zhang , L. Zhang , C. Zhao , N. Zotov , M. E. Zucker , J. Zweizig

Dark-siren Cosmology with Decihertz Gravitational-wave Detectors

Gravitational waves (GWs) originated from mergers of stellar-mass binary black holes (SBBHs) are considered as dark sirens in cosmology since they usually do not have electromagnetic counterparts. In order to study cosmos with these events,…

Cosmology and Nongalactic Astrophysics · Physics 2022-11-23 Muxin Liu , Chang Liu , Yi-Ming Hu , Lijing Shao , Yacheng Kang

Gravitational Wave Cosmology: Be Careful of the Black Hole Mass Spectrum

Gravitational waves (GWs) from compact binary coalescences (CBCs) offer insights into the universe expansion. The spectral siren method, used without electromagnetic counterparts (EMC), infers cosmic expansion (Hubble constant) by relating…

General Relativity and Quantum Cosmology · Physics 2024-05-28 Grégoire Pierra

Constraining the Hubble constant to a precision of about 1% using multi-band dark standard siren detections

Gravitational wave signal from the inspiral of stellar-mass binary black hole can be used as standard sirens to perform cosmological inference. This inspiral covers a wide range of frequency bands, from the millihertz band to the…

Cosmology and Nongalactic Astrophysics · Physics 2022-02-01 Liang-Gui Zhu , Ling-Hua Xie , Yi-Ming Hu , Shuai Liu , En-Kun Li , Nicola R. Napolitano , Bai-Tian Tang , Jian-dong Zhang , Jianwei Mei

Mapping the Universe Expansion: Enabling percent-level measurements of the Hubble Constant with a single binary neutron-star merger detection

The joint observation of the gravitational-wave and electromagnetic signal from the binary neutron-star merger GW170817 allowed for a new independent measurement of the Hubble constant $H_0$, albeit with an uncertainty of about 15\% at…

General Relativity and Quantum Cosmology · Physics 2021-05-11 Juan Calderón Bustillo , Samson H. W. Leong , Tim Dietrich , Paul D. Lasky

Cosmology and dark energy from joint gravitational wave-GRB observations

Gravitational-wave (GW) detectors can contribute to the measurement of cosmological parameters and to testing the dark-energy sector of alternatives to $\Lambda$CDM, by using standard sirens. In this paper we focus on binary neutron stars…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-21 Enis Belgacem , Yves Dirian , Stefano Foffa , Eric J. Howell , Michele Maggiore , Tania Regimbau

Probing cosmology with bright sirens from the CosmoDC2_BCO LSST synthetic catalog

Bright sirens, i.e. gravitational-wave detections of compact binary mergers with electromagnetic counterparts, provide a self-calibrated distance-redshift relation and are therefore powerful probes of cosmic expansion. Using the…

Cosmology and Nongalactic Astrophysics · Physics 2026-02-18 Ranier Menote , Valerio Marra

Gravitational-wave cosmography with LISA and the Hubble tension

We propose that stellar-mass binary black holes like GW150914 will become a tool to explore the local Universe within ~100Mpc in the era of the Laser Interferometer Space Antenna (LISA). High calibration accuracy and annual motion of LISA…

Cosmology and Nongalactic Astrophysics · Physics 2017-05-03 Koutarou Kyutoku , Naoki Seto

Measuring Hubble Constant with Dark Neutron Star-Black Hole Mergers

Detection of gravitational waves (GWs) from neutron star-black hole (NSBH) standard sirens can provide local measurements of the Hubble constant ($H_0$), regardless of the detection of an electromagnetic (EM) counterpart: The presence of…

Cosmology and Nongalactic Astrophysics · Physics 2022-07-26 B. Shiralilou , G. Raaijmakers , B. Duboeuf , S. Nissanke , F. Foucart , T. Hinderer , A. Williamson

Study on Gravitational Waves from Binary Mergers and Constraints on the Hubble Parameter

Einstein's General Theory of Relativity predicted the existence of gravitational waves (GWs), which offer a way to explore cosmic events like binary mergers and could help resolve the Hubble Tension. The Hubble Tension refers to the…

General Relativity and Quantum Cosmology · Physics 2025-01-07 Rishav Laloo , Prachi Gupta , Arun Kenath

Future Constraints on Dynamical Dark-Energy using Gravitational-Wave Standard Sirens

The detection of gravitational waves (GW) by the LIGO and Virgo collaborations offers a whole new range of possible tests and opens up a new window which may shed light on the nature of dark energy and dark matter. In the present work we…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-28 Minghui Du , Weiqiang Yang , Lixin Xu , Supriya Pan , David F. Mota

Blinded Mock Data Challenge for Gravitational-Wave Cosmology-I: Assessing the Robustness of Methods Using Binary Black Holes Mass Spectrum

Gravitational Wave (GW) sources are standard sirens that provide an independent way to map the cosmic expansion history by combining with an independent redshift measurement either from an electromagnetic counterpart for a bright siren or…

Cosmology and Nongalactic Astrophysics · Physics 2025-05-20 Aman Agarwal , Ulyana Dupletsa , Konstantin Leyde , Suvodip Mukherjee , Benoit Revenu , Juan Esteban Rivera , Antonio Enea Romano , Mohit Raj Sah , Sergio Vallejo-Pena , Adrian Avendano , Freija Beirnaert , Gergely Dalya , Miguel Cifuentes Espitia , Christos Karathanasis , Santiago Moreno-Gonzalez , Lucas Quiceno , Federico Stachurski , Juan Garcia-Bellido , Rachel Gray , Nicola Tamanini , Cezary Turski

Probing (sub-)solar-mass black holes and superspinars with current and next-generation gravitational-wave observatories

Gravitational-wave observations provide a powerful probe of compact objects and strong-field gravity. In this work, we investigate the detectability of binaries containing (sub-)solar-mass black holes and superspinars with current and…

General Relativity and Quantum Cosmology · Physics 2026-05-19 K. S. Sruthy , N. V. Krishnendu , Chandrachur Chakraborty , Nami Uchikata

Calibrating spectral siren cosmology with synthetic catalogs of binary black hole mergers

Binary black hole (BBH) mergers detected through Gravitational Waves (GWs) are a promising probe for the cosmic expansion. These sources are standard sirens for which we can directly measure the luminosity distance, but their redshift is…

Cosmology and Nongalactic Astrophysics · Physics 2026-03-17 Arianna Scarpa , Simone Mastrogiovanni , Filippo Santoliquido , Manuel Arca-Sedda

Using gravitational wave dark sirens to choose between host galaxy weighting models

Binary black hole (BBH) mergers,, an important source of gravitational-waves(GWs), are assumed to be hosted in galaxies. The probability of a galaxy to host a BBH is related to its properties, for example stellar mass and star formation…

Cosmology and Nongalactic Astrophysics · Physics 2025-08-22 Zhuotao Li , Rachel Gray , Ik Siong Heng